Source

yii-bootstrap / demo / yii / db / ar / CActiveRecord.php

Full commit
   1
   2
   3
   4
   5
   6
   7
   8
   9
  10
  11
  12
  13
  14
  15
  16
  17
  18
  19
  20
  21
  22
  23
  24
  25
  26
  27
  28
  29
  30
  31
  32
  33
  34
  35
  36
  37
  38
  39
  40
  41
  42
  43
  44
  45
  46
  47
  48
  49
  50
  51
  52
  53
  54
  55
  56
  57
  58
  59
  60
  61
  62
  63
  64
  65
  66
  67
  68
  69
  70
  71
  72
  73
  74
  75
  76
  77
  78
  79
  80
  81
  82
  83
  84
  85
  86
  87
  88
  89
  90
  91
  92
  93
  94
  95
  96
  97
  98
  99
 100
 101
 102
 103
 104
 105
 106
 107
 108
 109
 110
 111
 112
 113
 114
 115
 116
 117
 118
 119
 120
 121
 122
 123
 124
 125
 126
 127
 128
 129
 130
 131
 132
 133
 134
 135
 136
 137
 138
 139
 140
 141
 142
 143
 144
 145
 146
 147
 148
 149
 150
 151
 152
 153
 154
 155
 156
 157
 158
 159
 160
 161
 162
 163
 164
 165
 166
 167
 168
 169
 170
 171
 172
 173
 174
 175
 176
 177
 178
 179
 180
 181
 182
 183
 184
 185
 186
 187
 188
 189
 190
 191
 192
 193
 194
 195
 196
 197
 198
 199
 200
 201
 202
 203
 204
 205
 206
 207
 208
 209
 210
 211
 212
 213
 214
 215
 216
 217
 218
 219
 220
 221
 222
 223
 224
 225
 226
 227
 228
 229
 230
 231
 232
 233
 234
 235
 236
 237
 238
 239
 240
 241
 242
 243
 244
 245
 246
 247
 248
 249
 250
 251
 252
 253
 254
 255
 256
 257
 258
 259
 260
 261
 262
 263
 264
 265
 266
 267
 268
 269
 270
 271
 272
 273
 274
 275
 276
 277
 278
 279
 280
 281
 282
 283
 284
 285
 286
 287
 288
 289
 290
 291
 292
 293
 294
 295
 296
 297
 298
 299
 300
 301
 302
 303
 304
 305
 306
 307
 308
 309
 310
 311
 312
 313
 314
 315
 316
 317
 318
 319
 320
 321
 322
 323
 324
 325
 326
 327
 328
 329
 330
 331
 332
 333
 334
 335
 336
 337
 338
 339
 340
 341
 342
 343
 344
 345
 346
 347
 348
 349
 350
 351
 352
 353
 354
 355
 356
 357
 358
 359
 360
 361
 362
 363
 364
 365
 366
 367
 368
 369
 370
 371
 372
 373
 374
 375
 376
 377
 378
 379
 380
 381
 382
 383
 384
 385
 386
 387
 388
 389
 390
 391
 392
 393
 394
 395
 396
 397
 398
 399
 400
 401
 402
 403
 404
 405
 406
 407
 408
 409
 410
 411
 412
 413
 414
 415
 416
 417
 418
 419
 420
 421
 422
 423
 424
 425
 426
 427
 428
 429
 430
 431
 432
 433
 434
 435
 436
 437
 438
 439
 440
 441
 442
 443
 444
 445
 446
 447
 448
 449
 450
 451
 452
 453
 454
 455
 456
 457
 458
 459
 460
 461
 462
 463
 464
 465
 466
 467
 468
 469
 470
 471
 472
 473
 474
 475
 476
 477
 478
 479
 480
 481
 482
 483
 484
 485
 486
 487
 488
 489
 490
 491
 492
 493
 494
 495
 496
 497
 498
 499
 500
 501
 502
 503
 504
 505
 506
 507
 508
 509
 510
 511
 512
 513
 514
 515
 516
 517
 518
 519
 520
 521
 522
 523
 524
 525
 526
 527
 528
 529
 530
 531
 532
 533
 534
 535
 536
 537
 538
 539
 540
 541
 542
 543
 544
 545
 546
 547
 548
 549
 550
 551
 552
 553
 554
 555
 556
 557
 558
 559
 560
 561
 562
 563
 564
 565
 566
 567
 568
 569
 570
 571
 572
 573
 574
 575
 576
 577
 578
 579
 580
 581
 582
 583
 584
 585
 586
 587
 588
 589
 590
 591
 592
 593
 594
 595
 596
 597
 598
 599
 600
 601
 602
 603
 604
 605
 606
 607
 608
 609
 610
 611
 612
 613
 614
 615
 616
 617
 618
 619
 620
 621
 622
 623
 624
 625
 626
 627
 628
 629
 630
 631
 632
 633
 634
 635
 636
 637
 638
 639
 640
 641
 642
 643
 644
 645
 646
 647
 648
 649
 650
 651
 652
 653
 654
 655
 656
 657
 658
 659
 660
 661
 662
 663
 664
 665
 666
 667
 668
 669
 670
 671
 672
 673
 674
 675
 676
 677
 678
 679
 680
 681
 682
 683
 684
 685
 686
 687
 688
 689
 690
 691
 692
 693
 694
 695
 696
 697
 698
 699
 700
 701
 702
 703
 704
 705
 706
 707
 708
 709
 710
 711
 712
 713
 714
 715
 716
 717
 718
 719
 720
 721
 722
 723
 724
 725
 726
 727
 728
 729
 730
 731
 732
 733
 734
 735
 736
 737
 738
 739
 740
 741
 742
 743
 744
 745
 746
 747
 748
 749
 750
 751
 752
 753
 754
 755
 756
 757
 758
 759
 760
 761
 762
 763
 764
 765
 766
 767
 768
 769
 770
 771
 772
 773
 774
 775
 776
 777
 778
 779
 780
 781
 782
 783
 784
 785
 786
 787
 788
 789
 790
 791
 792
 793
 794
 795
 796
 797
 798
 799
 800
 801
 802
 803
 804
 805
 806
 807
 808
 809
 810
 811
 812
 813
 814
 815
 816
 817
 818
 819
 820
 821
 822
 823
 824
 825
 826
 827
 828
 829
 830
 831
 832
 833
 834
 835
 836
 837
 838
 839
 840
 841
 842
 843
 844
 845
 846
 847
 848
 849
 850
 851
 852
 853
 854
 855
 856
 857
 858
 859
 860
 861
 862
 863
 864
 865
 866
 867
 868
 869
 870
 871
 872
 873
 874
 875
 876
 877
 878
 879
 880
 881
 882
 883
 884
 885
 886
 887
 888
 889
 890
 891
 892
 893
 894
 895
 896
 897
 898
 899
 900
 901
 902
 903
 904
 905
 906
 907
 908
 909
 910
 911
 912
 913
 914
 915
 916
 917
 918
 919
 920
 921
 922
 923
 924
 925
 926
 927
 928
 929
 930
 931
 932
 933
 934
 935
 936
 937
 938
 939
 940
 941
 942
 943
 944
 945
 946
 947
 948
 949
 950
 951
 952
 953
 954
 955
 956
 957
 958
 959
 960
 961
 962
 963
 964
 965
 966
 967
 968
 969
 970
 971
 972
 973
 974
 975
 976
 977
 978
 979
 980
 981
 982
 983
 984
 985
 986
 987
 988
 989
 990
 991
 992
 993
 994
 995
 996
 997
 998
 999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
<?php
/**
 * CActiveRecord class file.
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @link http://www.yiiframework.com/
 * @copyright Copyright &copy; 2008-2011 Yii Software LLC
 * @license http://www.yiiframework.com/license/
 */

/**
 * CActiveRecord is the base class for classes representing relational data.
 *
 * It implements the active record design pattern, a popular Object-Relational Mapping (ORM) technique.
 * Please check {@link http://www.yiiframework.com/doc/guide/database.ar the Guide} for more details
 * about this class.
 *
 * @property CDbCriteria $dbCriteria The query criteria that is associated with this model.
 * This criteria is mainly used by {@link scopes named scope} feature to accumulate
 * different criteria specifications.
 * @property CActiveRecordMetaData $metaData The meta for this AR class.
 * @property CDbConnection $dbConnection The database connection used by active record.
 * @property CDbTableSchema $tableSchema The metadata of the table that this AR belongs to.
 * @property CDbCommandBuilder $commandBuilder The command builder used by this AR.
 * @property array $attributes Attribute values indexed by attribute names.
 * @property boolean $isNewRecord Whether the record is new and should be inserted when calling {@link save}.
 * This property is automatically set in constructor and {@link populateRecord}.
 * Defaults to false, but it will be set to true if the instance is created using
 * the new operator.
 * @property mixed $primaryKey The primary key value. An array (column name=>column value) is returned if the primary key is composite.
 * If primary key is not defined, null will be returned.
 * @property mixed $oldPrimaryKey The old primary key value. An array (column name=>column value) is returned if the primary key is composite.
 * If primary key is not defined, null will be returned.
 * @property string $tableAlias The default table alias.
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @version $Id$
 * @package system.db.ar
 * @since 1.0
 */
abstract class CActiveRecord extends CModel
{
	const BELONGS_TO='CBelongsToRelation';
	const HAS_ONE='CHasOneRelation';
	const HAS_MANY='CHasManyRelation';
	const MANY_MANY='CManyManyRelation';
	const STAT='CStatRelation';

	/**
	 * @var CDbConnection the default database connection for all active record classes.
	 * By default, this is the 'db' application component.
	 * @see getDbConnection
	 */
	public static $db;

	private static $_models=array();			// class name => model

	private $_md;								// meta data
	private $_new=false;						// whether this instance is new or not
	private $_attributes=array();				// attribute name => attribute value
	private $_related=array();					// attribute name => related objects
	private $_c;								// query criteria (used by finder only)
	private $_pk;								// old primary key value
	private $_alias='t';						// the table alias being used for query


	/**
	 * Constructor.
	 * @param string $scenario scenario name. See {@link CModel::scenario} for more details about this parameter.
	 */
	public function __construct($scenario='insert')
	{
		if($scenario===null) // internally used by populateRecord() and model()
			return;

		$this->setScenario($scenario);
		$this->setIsNewRecord(true);
		$this->_attributes=$this->getMetaData()->attributeDefaults;

		$this->init();

		$this->attachBehaviors($this->behaviors());
		$this->afterConstruct();
	}

	/**
	 * Initializes this model.
	 * This method is invoked when an AR instance is newly created and has
	 * its {@link scenario} set.
	 * You may override this method to provide code that is needed to initialize the model (e.g. setting
	 * initial property values.)
	 */
	public function init()
	{
	}

	/**
	 * Sets the parameters about query caching.
	 * This is a shortcut method to {@link CDbConnection::cache()}.
	 * It changes the query caching parameter of the {@link dbConnection} instance.
	 * @param integer $duration the number of seconds that query results may remain valid in cache.
	 * If this is 0, the caching will be disabled.
	 * @param CCacheDependency $dependency the dependency that will be used when saving the query results into cache.
	 * @param integer $queryCount number of SQL queries that need to be cached after calling this method. Defaults to 1,
	 * meaning that the next SQL query will be cached.
	 * @return CActiveRecord the active record instance itself.
	 * @since 1.1.7
	 */
	public function cache($duration, $dependency=null, $queryCount=1)
	{
		$this->getDbConnection()->cache($duration, $dependency, $queryCount);
		return $this;
	}

	/**
	 * PHP sleep magic method.
	 * This method ensures that the model meta data reference is set to null.
	 * @return array
	 */
	public function __sleep()
	{
		$this->_md=null;
		return array_keys((array)$this);
	}

	/**
	 * PHP getter magic method.
	 * This method is overridden so that AR attributes can be accessed like properties.
	 * @param string $name property name
	 * @return mixed property value
	 * @see getAttribute
	 */
	public function __get($name)
	{
		if(isset($this->_attributes[$name]))
			return $this->_attributes[$name];
		else if(isset($this->getMetaData()->columns[$name]))
			return null;
		else if(isset($this->_related[$name]))
			return $this->_related[$name];
		else if(isset($this->getMetaData()->relations[$name]))
			return $this->getRelated($name);
		else
			return parent::__get($name);
	}

	/**
	 * PHP setter magic method.
	 * This method is overridden so that AR attributes can be accessed like properties.
	 * @param string $name property name
	 * @param mixed $value property value
	 */
	public function __set($name,$value)
	{
		if($this->setAttribute($name,$value)===false)
		{
			if(isset($this->getMetaData()->relations[$name]))
				$this->_related[$name]=$value;
			else
				parent::__set($name,$value);
		}
	}

	/**
	 * Checks if a property value is null.
	 * This method overrides the parent implementation by checking
	 * if the named attribute is null or not.
	 * @param string $name the property name or the event name
	 * @return boolean whether the property value is null
	 */
	public function __isset($name)
	{
		if(isset($this->_attributes[$name]))
			return true;
		else if(isset($this->getMetaData()->columns[$name]))
			return false;
		else if(isset($this->_related[$name]))
			return true;
		else if(isset($this->getMetaData()->relations[$name]))
			return $this->getRelated($name)!==null;
		else
			return parent::__isset($name);
	}

	/**
	 * Sets a component property to be null.
	 * This method overrides the parent implementation by clearing
	 * the specified attribute value.
	 * @param string $name the property name or the event name
	 */
	public function __unset($name)
	{
		if(isset($this->getMetaData()->columns[$name]))
			unset($this->_attributes[$name]);
		else if(isset($this->getMetaData()->relations[$name]))
			unset($this->_related[$name]);
		else
			parent::__unset($name);
	}

	/**
	 * Calls the named method which is not a class method.
	 * Do not call this method. This is a PHP magic method that we override
	 * to implement the named scope feature.
	 * @param string $name the method name
	 * @param array $parameters method parameters
	 * @return mixed the method return value
	 */
	public function __call($name,$parameters)
	{
		if(isset($this->getMetaData()->relations[$name]))
		{
			if(empty($parameters))
				return $this->getRelated($name,false);
			else
				return $this->getRelated($name,false,$parameters[0]);
		}

		$scopes=$this->scopes();
		if(isset($scopes[$name]))
		{
			$this->getDbCriteria()->mergeWith($scopes[$name]);
			return $this;
		}

		return parent::__call($name,$parameters);
	}

	/**
	 * Returns the related record(s).
	 * This method will return the related record(s) of the current record.
	 * If the relation is HAS_ONE or BELONGS_TO, it will return a single object
	 * or null if the object does not exist.
	 * If the relation is HAS_MANY or MANY_MANY, it will return an array of objects
	 * or an empty array.
	 * @param string $name the relation name (see {@link relations})
	 * @param boolean $refresh whether to reload the related objects from database. Defaults to false.
	 * @param mixed $params array or CDbCriteria object with additional parameters that customize the query conditions as specified in the relation declaration.
	 * @return mixed the related object(s).
	 * @throws CDbException if the relation is not specified in {@link relations}.
	 */
	public function getRelated($name,$refresh=false,$params=array())
	{
		if(!$refresh && $params===array() && (isset($this->_related[$name]) || array_key_exists($name,$this->_related)))
			return $this->_related[$name];

		$md=$this->getMetaData();
		if(!isset($md->relations[$name]))
			throw new CDbException(Yii::t('yii','{class} does not have relation "{name}".',
				array('{class}'=>get_class($this), '{name}'=>$name)));

		Yii::trace('lazy loading '.get_class($this).'.'.$name,'system.db.ar.CActiveRecord');
		$relation=$md->relations[$name];
		if($this->getIsNewRecord() && !$refresh && ($relation instanceof CHasOneRelation || $relation instanceof CHasManyRelation))
			return $relation instanceof CHasOneRelation ? null : array();

		if($params!==array()) // dynamic query
		{
			$exists=isset($this->_related[$name]) || array_key_exists($name,$this->_related);
			if($exists)
				$save=$this->_related[$name];

			if($params instanceof CDbCriteria)
				$params = $params->toArray();

			$r=array($name=>$params);
		}
		else
			$r=$name;
		unset($this->_related[$name]);

		$finder=new CActiveFinder($this,$r);
		$finder->lazyFind($this);

		if(!isset($this->_related[$name]))
		{
			if($relation instanceof CHasManyRelation)
				$this->_related[$name]=array();
			else if($relation instanceof CStatRelation)
				$this->_related[$name]=$relation->defaultValue;
			else
				$this->_related[$name]=null;
		}

		if($params!==array())
		{
			$results=$this->_related[$name];
			if($exists)
				$this->_related[$name]=$save;
			else
				unset($this->_related[$name]);
			return $results;
		}
		else
			return $this->_related[$name];
	}

	/**
	 * Returns a value indicating whether the named related object(s) has been loaded.
	 * @param string $name the relation name
	 * @return boolean a value indicating whether the named related object(s) has been loaded.
	 */
	public function hasRelated($name)
	{
		return isset($this->_related[$name]) || array_key_exists($name,$this->_related);
	}

	/**
	 * Returns the query criteria associated with this model.
	 * @param boolean $createIfNull whether to create a criteria instance if it does not exist. Defaults to true.
	 * @return CDbCriteria the query criteria that is associated with this model.
	 * This criteria is mainly used by {@link scopes named scope} feature to accumulate
	 * different criteria specifications.
	 */
	public function getDbCriteria($createIfNull=true)
	{
		if($this->_c===null)
		{
			if(($c=$this->defaultScope())!==array() || $createIfNull)
				$this->_c=new CDbCriteria($c);
		}
		return $this->_c;
	}

	/**
	 * Sets the query criteria for the current model.
	 * @param CDbCriteria $criteria the query criteria
	 * @since 1.1.3
	 */
	public function setDbCriteria($criteria)
	{
		$this->_c=$criteria;
	}

	/**
	 * Returns the default named scope that should be implicitly applied to all queries for this model.
	 * Note, default scope only applies to SELECT queries. It is ignored for INSERT, UPDATE and DELETE queries.
	 * The default implementation simply returns an empty array. You may override this method
	 * if the model needs to be queried with some default criteria (e.g. only active records should be returned).
	 * @return array the query criteria. This will be used as the parameter to the constructor
	 * of {@link CDbCriteria}.
	 */
	public function defaultScope()
	{
		return array();
	}

	/**
	 * Resets all scopes and criterias applied including default scope.
	 *
	 * @return CActiveRecord
	 * @since 1.1.2
	 */
	public function resetScope()
	{
		$this->_c=new CDbCriteria();
		return $this;
	}

	/**
	 * Returns the static model of the specified AR class.
	 * The model returned is a static instance of the AR class.
	 * It is provided for invoking class-level methods (something similar to static class methods.)
	 *
	 * EVERY derived AR class must override this method as follows,
	 * <pre>
	 * public static function model($className=__CLASS__)
	 * {
	 *     return parent::model($className);
	 * }
	 * </pre>
	 *
	 * @param string $className active record class name.
	 * @return CActiveRecord active record model instance.
	 */
	public static function model($className=__CLASS__)
	{
		if(isset(self::$_models[$className]))
			return self::$_models[$className];
		else
		{
			$model=self::$_models[$className]=new $className(null);
			$model->_md=new CActiveRecordMetaData($model);
			$model->attachBehaviors($model->behaviors());
			return $model;
		}
	}

	/**
	 * Returns the meta-data for this AR
	 * @return CActiveRecordMetaData the meta for this AR class.
	 */
	public function getMetaData()
	{
		if($this->_md!==null)
			return $this->_md;
		else
			return $this->_md=self::model(get_class($this))->_md;
	}

	/**
	 * Refreshes the meta data for this AR class.
	 * By calling this method, this AR class will regenerate the meta data needed.
	 * This is useful if the table schema has been changed and you want to use the latest
	 * available table schema. Make sure you have called {@link CDbSchema::refresh}
	 * before you call this method. Otherwise, old table schema data will still be used.
	 */
	public function refreshMetaData()
	{
		$finder=self::model(get_class($this));
		$finder->_md=new CActiveRecordMetaData($finder);
		if($this!==$finder)
			$this->_md=$finder->_md;
	}

	/**
	 * Returns the name of the associated database table.
	 * By default this method returns the class name as the table name.
	 * You may override this method if the table is not named after this convention.
	 * @return string the table name
	 */
	public function tableName()
	{
		return get_class($this);
	}

	/**
	 * Returns the primary key of the associated database table.
	 * This method is meant to be overridden in case when the table is not defined with a primary key
	 * (for some legency database). If the table is already defined with a primary key,
	 * you do not need to override this method. The default implementation simply returns null,
	 * meaning using the primary key defined in the database.
	 * @return mixed the primary key of the associated database table.
	 * If the key is a single column, it should return the column name;
	 * If the key is a composite one consisting of several columns, it should
	 * return the array of the key column names.
	 */
	public function primaryKey()
	{
	}

	/**
	 * This method should be overridden to declare related objects.
	 *
	 * There are four types of relations that may exist between two active record objects:
	 * <ul>
	 * <li>BELONGS_TO: e.g. a member belongs to a team;</li>
	 * <li>HAS_ONE: e.g. a member has at most one profile;</li>
	 * <li>HAS_MANY: e.g. a team has many members;</li>
	 * <li>MANY_MANY: e.g. a member has many skills and a skill belongs to a member.</li>
	 * </ul>
	 *
	 * Besides the above relation types, a special relation called STAT is also supported
	 * that can be used to perform statistical query (or aggregational query).
	 * It retrieves the aggregational information about the related objects, such as the number
	 * of comments for each post, the average rating for each product, etc.
	 *
	 * Each kind of related objects is defined in this method as an array with the following elements:
	 * <pre>
	 * 'varName'=>array('relationType', 'className', 'foreign_key', ...additional options)
	 * </pre>
	 * where 'varName' refers to the name of the variable/property that the related object(s) can
	 * be accessed through; 'relationType' refers to the type of the relation, which can be one of the
	 * following four constants: self::BELONGS_TO, self::HAS_ONE, self::HAS_MANY and self::MANY_MANY;
	 * 'className' refers to the name of the active record class that the related object(s) is of;
	 * and 'foreign_key' states the foreign key that relates the two kinds of active record.
	 * Note, for composite foreign keys, they can be either listed together, separated by commas or specified as an array
	 * in format of array('key1','key2'). In case you need to specify custom PK->FK association you can define it as
	 * array('fk'=>'pk'). For composite keys it will be array('fk_c1'=>'pk_с1','fk_c2'=>'pk_c2').
	 * For foreign keys used in MANY_MANY relation, the joining table must be declared as well
	 * (e.g. 'join_table(fk1, fk2)').
	 *
	 * Additional options may be specified as name-value pairs in the rest array elements:
	 * <ul>
	 * <li>'select': string|array, a list of columns to be selected. Defaults to '*', meaning all columns.
	 *   Column names should be disambiguated if they appear in an expression (e.g. COUNT(relationName.name) AS name_count).</li>
	 * <li>'condition': string, the WHERE clause. Defaults to empty. Note, column references need to
	 *   be disambiguated with prefix 'relationName.' (e.g. relationName.age&gt;20)</li>
	 * <li>'order': string, the ORDER BY clause. Defaults to empty. Note, column references need to
	 *   be disambiguated with prefix 'relationName.' (e.g. relationName.age DESC)</li>
	 * <li>'with': string|array, a list of child related objects that should be loaded together with this object.
	 *   Note, this is only honored by lazy loading, not eager loading.</li>
	 * <li>'joinType': type of join. Defaults to 'LEFT OUTER JOIN'.</li>
	 * <li>'alias': the alias for the table associated with this relationship.
	 *   It defaults to null,
	 *   meaning the table alias is the same as the relation name.</li>
	 * <li>'params': the parameters to be bound to the generated SQL statement.
	 *   This should be given as an array of name-value pairs.</li>
	 * <li>'on': the ON clause. The condition specified here will be appended
	 *   to the joining condition using the AND operator.</li>
	 * <li>'index': the name of the column whose values should be used as keys
	 *   of the array that stores related objects. This option is only available to
	 *   HAS_MANY and MANY_MANY relations.</li>
	 * <li>'scopes': scopes to apply. In case of a single scope can be used like 'scopes'=>'scopeName',
	 *   in case of multiple scopes can be used like 'scopes'=>array('scopeName1','scopeName2').
	 *   This option has been available since version 1.1.9.</li>
	 * </ul>
	 *
	 * The following options are available for certain relations when lazy loading:
	 * <ul>
	 * <li>'group': string, the GROUP BY clause. Defaults to empty. Note, column references need to
	 *   be disambiguated with prefix 'relationName.' (e.g. relationName.age). This option only applies to HAS_MANY and MANY_MANY relations.</li>
	 * <li>'having': string, the HAVING clause. Defaults to empty. Note, column references need to
	 *   be disambiguated with prefix 'relationName.' (e.g. relationName.age). This option only applies to HAS_MANY and MANY_MANY relations.</li>
	 * <li>'limit': limit of the rows to be selected. This option does not apply to BELONGS_TO relation.</li>
	 * <li>'offset': offset of the rows to be selected. This option does not apply to BELONGS_TO relation.</li>
	 * <li>'through': name of the model's relation that will be used as a bridge when getting related data. Can be set only for HAS_ONE and HAS_MANY. This option has been available since version 1.1.7.</li>
	 * </ul>
	 *
	 * Below is an example declaring related objects for 'Post' active record class:
	 * <pre>
	 * return array(
	 *     'author'=>array(self::BELONGS_TO, 'User', 'author_id'),
	 *     'comments'=>array(self::HAS_MANY, 'Comment', 'post_id', 'with'=>'author', 'order'=>'create_time DESC'),
	 *     'tags'=>array(self::MANY_MANY, 'Tag', 'post_tag(post_id, tag_id)', 'order'=>'name'),
	 * );
	 * </pre>
	 *
	 * @return array list of related object declarations. Defaults to empty array.
	 */
	public function relations()
	{
		return array();
	}

	/**
	 * Returns the declaration of named scopes.
	 * A named scope represents a query criteria that can be chained together with
	 * other named scopes and applied to a query. This method should be overridden
	 * by child classes to declare named scopes for the particular AR classes.
	 * For example, the following code declares two named scopes: 'recently' and
	 * 'published'.
	 * <pre>
	 * return array(
	 *     'published'=>array(
	 *           'condition'=>'status=1',
	 *     ),
	 *     'recently'=>array(
	 *           'order'=>'create_time DESC',
	 *           'limit'=>5,
	 *     ),
	 * );
	 * </pre>
	 * If the above scopes are declared in a 'Post' model, we can perform the following
	 * queries:
	 * <pre>
	 * $posts=Post::model()->published()->findAll();
	 * $posts=Post::model()->published()->recently()->findAll();
	 * $posts=Post::model()->published()->with('comments')->findAll();
	 * </pre>
	 * Note that the last query is a relational query.
	 *
	 * @return array the scope definition. The array keys are scope names; the array
	 * values are the corresponding scope definitions. Each scope definition is represented
	 * as an array whose keys must be properties of {@link CDbCriteria}.
	 */
	public function scopes()
	{
		return array();
	}

	/**
	 * Returns the list of all attribute names of the model.
	 * This would return all column names of the table associated with this AR class.
	 * @return array list of attribute names.
	 */
	public function attributeNames()
	{
		return array_keys($this->getMetaData()->columns);
	}

	/**
	 * Returns the text label for the specified attribute.
	 * This method overrides the parent implementation by supporting
	 * returning the label defined in relational object.
	 * In particular, if the attribute name is in the form of "post.author.name",
	 * then this method will derive the label from the "author" relation's "name" attribute.
	 * @param string $attribute the attribute name
	 * @return string the attribute label
	 * @see generateAttributeLabel
	 * @since 1.1.4
	 */
	public function getAttributeLabel($attribute)
	{
		$labels=$this->attributeLabels();
		if(isset($labels[$attribute]))
			return $labels[$attribute];
		else if(strpos($attribute,'.')!==false)
		{
			$segs=explode('.',$attribute);
			$name=array_pop($segs);
			$model=$this;
			foreach($segs as $seg)
			{
				$relations=$model->getMetaData()->relations;
				if(isset($relations[$seg]))
					$model=CActiveRecord::model($relations[$seg]->className);
				else
					break;
			}
			return $model->getAttributeLabel($name);
		}
		else
			return $this->generateAttributeLabel($attribute);
	}

	/**
	 * Returns the database connection used by active record.
	 * By default, the "db" application component is used as the database connection.
	 * You may override this method if you want to use a different database connection.
	 * @return CDbConnection the database connection used by active record.
	 */
	public function getDbConnection()
	{
		if(self::$db!==null)
			return self::$db;
		else
		{
			self::$db=Yii::app()->getDb();
			if(self::$db instanceof CDbConnection)
				return self::$db;
			else
				throw new CDbException(Yii::t('yii','Active Record requires a "db" CDbConnection application component.'));
		}
	}

	/**
	 * Returns the named relation declared for this AR class.
	 * @param string $name the relation name
	 * @return CActiveRelation the named relation declared for this AR class. Null if the relation does not exist.
	 */
	public function getActiveRelation($name)
	{
		return isset($this->getMetaData()->relations[$name]) ? $this->getMetaData()->relations[$name] : null;
	}

	/**
	 * Returns the metadata of the table that this AR belongs to
	 * @return CDbTableSchema the metadata of the table that this AR belongs to
	 */
	public function getTableSchema()
	{
		return $this->getMetaData()->tableSchema;
	}

	/**
	 * Returns the command builder used by this AR.
	 * @return CDbCommandBuilder the command builder used by this AR
	 */
	public function getCommandBuilder()
	{
		return $this->getDbConnection()->getSchema()->getCommandBuilder();
	}

	/**
	 * Checks whether this AR has the named attribute
	 * @param string $name attribute name
	 * @return boolean whether this AR has the named attribute (table column).
	 */
	public function hasAttribute($name)
	{
		return isset($this->getMetaData()->columns[$name]);
	}

	/**
	 * Returns the named attribute value.
	 * If this is a new record and the attribute is not set before,
	 * the default column value will be returned.
	 * If this record is the result of a query and the attribute is not loaded,
	 * null will be returned.
	 * You may also use $this->AttributeName to obtain the attribute value.
	 * @param string $name the attribute name
	 * @return mixed the attribute value. Null if the attribute is not set or does not exist.
	 * @see hasAttribute
	 */
	public function getAttribute($name)
	{
		if(property_exists($this,$name))
			return $this->$name;
		else if(isset($this->_attributes[$name]))
			return $this->_attributes[$name];
	}

	/**
	 * Sets the named attribute value.
	 * You may also use $this->AttributeName to set the attribute value.
	 * @param string $name the attribute name
	 * @param mixed $value the attribute value.
	 * @return boolean whether the attribute exists and the assignment is conducted successfully
	 * @see hasAttribute
	 */
	public function setAttribute($name,$value)
	{
		if(property_exists($this,$name))
			$this->$name=$value;
		else if(isset($this->getMetaData()->columns[$name]))
			$this->_attributes[$name]=$value;
		else
			return false;
		return true;
	}

	/**
	 * Do not call this method. This method is used internally by {@link CActiveFinder} to populate
	 * related objects. This method adds a related object to this record.
	 * @param string $name attribute name
	 * @param mixed $record the related record
	 * @param mixed $index the index value in the related object collection.
	 * If true, it means using zero-based integer index.
	 * If false, it means a HAS_ONE or BELONGS_TO object and no index is needed.
	 */
	public function addRelatedRecord($name,$record,$index)
	{
		if($index!==false)
		{
			if(!isset($this->_related[$name]))
				$this->_related[$name]=array();
			if($record instanceof CActiveRecord)
			{
				if($index===true)
					$this->_related[$name][]=$record;
				else
					$this->_related[$name][$index]=$record;
			}
		}
		else if(!isset($this->_related[$name]))
			$this->_related[$name]=$record;
	}

	/**
	 * Returns all column attribute values.
	 * Note, related objects are not returned.
	 * @param mixed $names names of attributes whose value needs to be returned.
	 * If this is true (default), then all attribute values will be returned, including
	 * those that are not loaded from DB (null will be returned for those attributes).
	 * If this is null, all attributes except those that are not loaded from DB will be returned.
	 * @return array attribute values indexed by attribute names.
	 */
	public function getAttributes($names=true)
	{
		$attributes=$this->_attributes;
		foreach($this->getMetaData()->columns as $name=>$column)
		{
			if(property_exists($this,$name))
				$attributes[$name]=$this->$name;
			else if($names===true && !isset($attributes[$name]))
				$attributes[$name]=null;
		}
		if(is_array($names))
		{
			$attrs=array();
			foreach($names as $name)
			{
				if(property_exists($this,$name))
					$attrs[$name]=$this->$name;
				else
					$attrs[$name]=isset($attributes[$name])?$attributes[$name]:null;
			}
			return $attrs;
		}
		else
			return $attributes;
	}

	/**
	 * Saves the current record.
	 *
	 * The record is inserted as a row into the database table if its {@link isNewRecord}
	 * property is true (usually the case when the record is created using the 'new'
	 * operator). Otherwise, it will be used to update the corresponding row in the table
	 * (usually the case if the record is obtained using one of those 'find' methods.)
	 *
	 * Validation will be performed before saving the record. If the validation fails,
	 * the record will not be saved. You can call {@link getErrors()} to retrieve the
	 * validation errors.
	 *
	 * If the record is saved via insertion, its {@link isNewRecord} property will be
	 * set false, and its {@link scenario} property will be set to be 'update'.
	 * And if its primary key is auto-incremental and is not set before insertion,
	 * the primary key will be populated with the automatically generated key value.
	 *
	 * @param boolean $runValidation whether to perform validation before saving the record.
	 * If the validation fails, the record will not be saved to database.
	 * @param array $attributes list of attributes that need to be saved. Defaults to null,
	 * meaning all attributes that are loaded from DB will be saved.
	 * @return boolean whether the saving succeeds
	 */
	public function save($runValidation=true,$attributes=null)
	{
		if(!$runValidation || $this->validate($attributes))
			return $this->getIsNewRecord() ? $this->insert($attributes) : $this->update($attributes);
		else
			return false;
	}

	/**
	 * Returns if the current record is new.
	 * @return boolean whether the record is new and should be inserted when calling {@link save}.
	 * This property is automatically set in constructor and {@link populateRecord}.
	 * Defaults to false, but it will be set to true if the instance is created using
	 * the new operator.
	 */
	public function getIsNewRecord()
	{
		return $this->_new;
	}

	/**
	 * Sets if the record is new.
	 * @param boolean $value whether the record is new and should be inserted when calling {@link save}.
	 * @see getIsNewRecord
	 */
	public function setIsNewRecord($value)
	{
		$this->_new=$value;
	}

	/**
	 * This event is raised before the record is saved.
	 * By setting {@link CModelEvent::isValid} to be false, the normal {@link save()} process will be stopped.
	 * @param CModelEvent $event the event parameter
	 */
	public function onBeforeSave($event)
	{
		$this->raiseEvent('onBeforeSave',$event);
	}

	/**
	 * This event is raised after the record is saved.
	 * @param CEvent $event the event parameter
	 */
	public function onAfterSave($event)
	{
		$this->raiseEvent('onAfterSave',$event);
	}

	/**
	 * This event is raised before the record is deleted.
	 * By setting {@link CModelEvent::isValid} to be false, the normal {@link delete()} process will be stopped.
	 * @param CModelEvent $event the event parameter
	 */
	public function onBeforeDelete($event)
	{
		$this->raiseEvent('onBeforeDelete',$event);
	}

	/**
	 * This event is raised after the record is deleted.
	 * @param CEvent $event the event parameter
	 */
	public function onAfterDelete($event)
	{
		$this->raiseEvent('onAfterDelete',$event);
	}

	/**
	 * This event is raised before an AR finder performs a find call.
	 * In this event, the {@link CModelEvent::criteria} property contains the query criteria
	 * passed as parameters to those find methods. If you want to access
	 * the query criteria specified in scopes, please use {@link getDbCriteria()}.
	 * You can modify either criteria to customize them based on needs.
	 * @param CModelEvent $event the event parameter
	 * @see beforeFind
	 */
	public function onBeforeFind($event)
	{
		$this->raiseEvent('onBeforeFind',$event);
	}

	/**
	 * This event is raised after the record is instantiated by a find method.
	 * @param CEvent $event the event parameter
	 */
	public function onAfterFind($event)
	{
		$this->raiseEvent('onAfterFind',$event);
	}

	/**
	 * This method is invoked before saving a record (after validation, if any).
	 * The default implementation raises the {@link onBeforeSave} event.
	 * You may override this method to do any preparation work for record saving.
	 * Use {@link isNewRecord} to determine whether the saving is
	 * for inserting or updating record.
	 * Make sure you call the parent implementation so that the event is raised properly.
	 * @return boolean whether the saving should be executed. Defaults to true.
	 */
	protected function beforeSave()
	{
		if($this->hasEventHandler('onBeforeSave'))
		{
			$event=new CModelEvent($this);
			$this->onBeforeSave($event);
			return $event->isValid;
		}
		else
			return true;
	}

	/**
	 * This method is invoked after saving a record successfully.
	 * The default implementation raises the {@link onAfterSave} event.
	 * You may override this method to do postprocessing after record saving.
	 * Make sure you call the parent implementation so that the event is raised properly.
	 */
	protected function afterSave()
	{
		if($this->hasEventHandler('onAfterSave'))
			$this->onAfterSave(new CEvent($this));
	}

	/**
	 * This method is invoked before deleting a record.
	 * The default implementation raises the {@link onBeforeDelete} event.
	 * You may override this method to do any preparation work for record deletion.
	 * Make sure you call the parent implementation so that the event is raised properly.
	 * @return boolean whether the record should be deleted. Defaults to true.
	 */
	protected function beforeDelete()
	{
		if($this->hasEventHandler('onBeforeDelete'))
		{
			$event=new CModelEvent($this);
			$this->onBeforeDelete($event);
			return $event->isValid;
		}
		else
			return true;
	}

	/**
	 * This method is invoked after deleting a record.
	 * The default implementation raises the {@link onAfterDelete} event.
	 * You may override this method to do postprocessing after the record is deleted.
	 * Make sure you call the parent implementation so that the event is raised properly.
	 */
	protected function afterDelete()
	{
		if($this->hasEventHandler('onAfterDelete'))
			$this->onAfterDelete(new CEvent($this));
	}

	/**
	 * This method is invoked before an AR finder executes a find call.
	 * The find calls include {@link find}, {@link findAll}, {@link findByPk},
	 * {@link findAllByPk}, {@link findByAttributes} and {@link findAllByAttributes}.
	 * The default implementation raises the {@link onBeforeFind} event.
	 * If you override this method, make sure you call the parent implementation
	 * so that the event is raised properly.
	 */
	protected function beforeFind()
	{
		if($this->hasEventHandler('onBeforeFind'))
		{
			$event=new CModelEvent($this);
			$this->onBeforeFind($event);
		}
	}

	/**
	 * This method is invoked after each record is instantiated by a find method.
	 * The default implementation raises the {@link onAfterFind} event.
	 * You may override this method to do postprocessing after each newly found record is instantiated.
	 * Make sure you call the parent implementation so that the event is raised properly.
	 */
	protected function afterFind()
	{
		if($this->hasEventHandler('onAfterFind'))
			$this->onAfterFind(new CEvent($this));
	}

	/**
	 * Calls {@link beforeFind}.
	 * This method is internally used.
	 */
	public function beforeFindInternal()
	{
		$this->beforeFind();
	}

	/**
	 * Calls {@link afterFind}.
	 * This method is internally used.
	 */
	public function afterFindInternal()
	{
		$this->afterFind();
	}

	/**
	 * Inserts a row into the table based on this active record attributes.
	 * If the table's primary key is auto-incremental and is null before insertion,
	 * it will be populated with the actual value after insertion.
	 * Note, validation is not performed in this method. You may call {@link validate} to perform the validation.
	 * After the record is inserted to DB successfully, its {@link isNewRecord} property will be set false,
	 * and its {@link scenario} property will be set to be 'update'.
	 * @param array $attributes list of attributes that need to be saved. Defaults to null,
	 * meaning all attributes that are loaded from DB will be saved.
	 * @return boolean whether the attributes are valid and the record is inserted successfully.
	 * @throws CException if the record is not new
	 */
	public function insert($attributes=null)
	{
		if(!$this->getIsNewRecord())
			throw new CDbException(Yii::t('yii','The active record cannot be inserted to database because it is not new.'));
		if($this->beforeSave())
		{
			Yii::trace(get_class($this).'.insert()','system.db.ar.CActiveRecord');
			$builder=$this->getCommandBuilder();
			$table=$this->getMetaData()->tableSchema;
			$command=$builder->createInsertCommand($table,$this->getAttributes($attributes));
			if($command->execute())
			{
				$primaryKey=$table->primaryKey;
				if($table->sequenceName!==null)
				{
					if(is_string($primaryKey) && $this->$primaryKey===null)
						$this->$primaryKey=$builder->getLastInsertID($table);
					else if(is_array($primaryKey))
					{
						foreach($primaryKey as $pk)
						{
							if($this->$pk===null)
							{
								$this->$pk=$builder->getLastInsertID($table);
								break;
							}
						}
					}
				}
				$this->_pk=$this->getPrimaryKey();
				$this->afterSave();
				$this->setIsNewRecord(false);
				$this->setScenario('update');
				return true;
			}
		}
		return false;
	}

	/**
	 * Updates the row represented by this active record.
	 * All loaded attributes will be saved to the database.
	 * Note, validation is not performed in this method. You may call {@link validate} to perform the validation.
	 * @param array $attributes list of attributes that need to be saved. Defaults to null,
	 * meaning all attributes that are loaded from DB will be saved.
	 * @return boolean whether the update is successful
	 * @throws CException if the record is new
	 */
	public function update($attributes=null)
	{
		if($this->getIsNewRecord())
			throw new CDbException(Yii::t('yii','The active record cannot be updated because it is new.'));
		if($this->beforeSave())
		{
			Yii::trace(get_class($this).'.update()','system.db.ar.CActiveRecord');
			if($this->_pk===null)
				$this->_pk=$this->getPrimaryKey();
			$this->updateByPk($this->getOldPrimaryKey(),$this->getAttributes($attributes));
			$this->_pk=$this->getPrimaryKey();
			$this->afterSave();
			return true;
		}
		else
			return false;
	}

	/**
	 * Saves a selected list of attributes.
	 * Unlike {@link save}, this method only saves the specified attributes
	 * of an existing row dataset and does NOT call either {@link beforeSave} or {@link afterSave}.
	 * Also note that this method does neither attribute filtering nor validation.
	 * So do not use this method with untrusted data (such as user posted data).
	 * You may consider the following alternative if you want to do so:
	 * <pre>
	 * $postRecord=Post::model()->findByPk($postID);
	 * $postRecord->attributes=$_POST['post'];
	 * $postRecord->save();
	 * </pre>
	 * @param array $attributes attributes to be updated. Each element represents an attribute name
	 * or an attribute value indexed by its name. If the latter, the record's
	 * attribute will be changed accordingly before saving.
	 * @return boolean whether the update is successful
	 * @throws CException if the record is new or any database error
	 */
	public function saveAttributes($attributes)
	{
		if(!$this->getIsNewRecord())
		{
			Yii::trace(get_class($this).'.saveAttributes()','system.db.ar.CActiveRecord');
			$values=array();
			foreach($attributes as $name=>$value)
			{
				if(is_integer($name))
					$values[$value]=$this->$value;
				else
					$values[$name]=$this->$name=$value;
			}
			if($this->_pk===null)
				$this->_pk=$this->getPrimaryKey();
			if($this->updateByPk($this->getOldPrimaryKey(),$values)>0)
			{
				$this->_pk=$this->getPrimaryKey();
				return true;
			}
			else
				return false;
		}
		else
			throw new CDbException(Yii::t('yii','The active record cannot be updated because it is new.'));
	}

	/**
	 * Saves one or several counter columns for the current AR object.
	 * Note that this method differs from {@link updateCounters} in that it only
	 * saves the current AR object.
	 * An example usage is as follows:
	 * <pre>
	 * $postRecord=Post::model()->findByPk($postID);
	 * $postRecord->saveCounters(array('view_count'=>1));
	 * </pre>
	 * Use negative values if you want to decrease the counters.
	 * @param array $counters the counters to be updated (column name=>increment value)
	 * @return boolean whether the saving is successful
	 * @see updateCounters
	 * @since 1.1.8
	 */
	public function saveCounters($counters)
	{
		Yii::trace(get_class($this).'.saveCounters()','system.db.ar.CActiveRecord');
		$builder=$this->getCommandBuilder();
		$table=$this->getTableSchema();
		$criteria=$builder->createPkCriteria($table,$this->getOldPrimaryKey());
		$command=$builder->createUpdateCounterCommand($this->getTableSchema(),$counters,$criteria);
		if($command->execute())
		{
			foreach($counters as $name=>$value)
				$this->$name=$this->$name+$value;
			return true;
		}
		else
			return false;
	}

	/**
	 * Deletes the row corresponding to this active record.
	 * @return boolean whether the deletion is successful.
	 * @throws CException if the record is new
	 */
	public function delete()
	{
		if(!$this->getIsNewRecord())
		{
			Yii::trace(get_class($this).'.delete()','system.db.ar.CActiveRecord');
			if($this->beforeDelete())
			{
				$result=$this->deleteByPk($this->getPrimaryKey())>0;
				$this->afterDelete();
				return $result;
			}
			else
				return false;
		}
		else
			throw new CDbException(Yii::t('yii','The active record cannot be deleted because it is new.'));
	}

	/**
	 * Repopulates this active record with the latest data.
	 * @return boolean whether the row still exists in the database. If true, the latest data will be populated to this active record.
	 */
	public function refresh()
	{
		Yii::trace(get_class($this).'.refresh()','system.db.ar.CActiveRecord');
		if(($record=$this->findByPk($this->getPrimaryKey()))!==null)
		{
			$this->_attributes=array();
			$this->_related=array();
			foreach($this->getMetaData()->columns as $name=>$column)
			{
				if(property_exists($this,$name))
					$this->$name=$record->$name;
				else
					$this->_attributes[$name]=$record->$name;
			}
			return true;
		}
		else
			return false;
	}

	/**
	 * Compares current active record with another one.
	 * The comparison is made by comparing table name and the primary key values of the two active records.
	 * @param CActiveRecord $record record to compare to
	 * @return boolean whether the two active records refer to the same row in the database table.
	 */
	public function equals($record)
	{
		return $this->tableName()===$record->tableName() && $this->getPrimaryKey()===$record->getPrimaryKey();
	}

	/**
	 * Returns the primary key value.
	 * @return mixed the primary key value. An array (column name=>column value) is returned if the primary key is composite.
	 * If primary key is not defined, null will be returned.
	 */
	public function getPrimaryKey()
	{
		$table=$this->getMetaData()->tableSchema;
		if(is_string($table->primaryKey))
			return $this->{$table->primaryKey};
		else if(is_array($table->primaryKey))
		{
			$values=array();
			foreach($table->primaryKey as $name)
				$values[$name]=$this->$name;
			return $values;
		}
		else
			return null;
	}

	/**
	 * Sets the primary key value.
	 * After calling this method, the old primary key value can be obtained from {@link oldPrimaryKey}.
	 * @param mixed $value the new primary key value. If the primary key is composite, the new value
	 * should be provided as an array (column name=>column value).
	 * @since 1.1.0
	 */
	public function setPrimaryKey($value)
	{
		$this->_pk=$this->getPrimaryKey();
		$table=$this->getMetaData()->tableSchema;
		if(is_string($table->primaryKey))
			$this->{$table->primaryKey}=$value;
		else if(is_array($table->primaryKey))
		{
			foreach($table->primaryKey as $name)
				$this->$name=$value[$name];
		}
	}

	/**
	 * Returns the old primary key value.
	 * This refers to the primary key value that is populated into the record
	 * after executing a find method (e.g. find(), findAll()).
	 * The value remains unchanged even if the primary key attribute is manually assigned with a different value.
	 * @return mixed the old primary key value. An array (column name=>column value) is returned if the primary key is composite.
	 * If primary key is not defined, null will be returned.
	 * @since 1.1.0
	 */
	public function getOldPrimaryKey()
	{
		return $this->_pk;
	}

	/**
	 * Sets the old primary key value.
	 * @param mixed $value the old primary key value.
	 * @since 1.1.3
	 */
	public function setOldPrimaryKey($value)
	{
		$this->_pk=$value;
	}

	/**
	 * Performs the actual DB query and populates the AR objects with the query result.
	 * This method is mainly internally used by other AR query methods.
	 * @param CDbCriteria $criteria the query criteria
	 * @param boolean $all whether to return all data
	 * @return mixed the AR objects populated with the query result
	 * @since 1.1.7
	 */
	protected function query($criteria,$all=false)
	{
		$this->beforeFind();
		$this->applyScopes($criteria);

		if(empty($criteria->with))
		{
			if(!$all)
				$criteria->limit=1;
			$command=$this->getCommandBuilder()->createFindCommand($this->getTableSchema(),$criteria);
			return $all ? $this->populateRecords($command->queryAll(), true, $criteria->index) : $this->populateRecord($command->queryRow());
		}
		else
		{
			$finder=new CActiveFinder($this,$criteria->with);
			return $finder->query($criteria,$all);
		}
	}

	/**
	 * Applies the query scopes to the given criteria.
	 * This method merges {@link dbCriteria} with the given criteria parameter.
	 * It then resets {@link dbCriteria} to be null.
	 * @param CDbCriteria $criteria the query criteria. This parameter may be modified by merging {@link dbCriteria}.
	 */
	public function applyScopes(&$criteria)
	{
		if(!empty($criteria->scopes))
		{
			$scs=$this->scopes();
			$c=$this->getDbCriteria();
			foreach((array)$criteria->scopes as $k=>$v)
			{
				if(is_integer($k))
				{
					if(is_string($v))
					{
						if(isset($scs[$v]))
						{
							$c->mergeWith($scs[$v],true);
							continue;
						}
						$scope=$v;
						$params=array();
					}
					else if(is_array($v))
					{
						$scope=key($v);
						$params=current($v);
					}
				}
				else if(is_string($k))
				{
					$scope=$k;
					$params=$v;
				}

				call_user_func_array(array($this,$scope),(array)$params);
			}
		}

		if(isset($c) || ($c=$this->getDbCriteria(false))!==null)
		{
			$c->mergeWith($criteria);
			$criteria=$c;
			$this->_c=null;
		}
	}

	/**
	 * Returns the table alias to be used by the find methods.
	 * In relational queries, the returned table alias may vary according to
	 * the corresponding relation declaration. Also, the default table alias
	 * set by {@link setTableAlias} may be overridden by the applied scopes.
	 * @param boolean $quote whether to quote the alias name
	 * @param boolean $checkScopes whether to check if a table alias is defined in the applied scopes so far.
	 * This parameter must be set false when calling this method in {@link defaultScope}.
	 * An infinite loop would be formed otherwise.
	 * @return string the default table alias
	 * @since 1.1.1
	 */
	public function getTableAlias($quote=false, $checkScopes=true)
	{
		if($checkScopes && ($criteria=$this->getDbCriteria(false))!==null && $criteria->alias!='')
			$alias=$criteria->alias;
		else
			$alias=$this->_alias;
		return $quote ? $this->getDbConnection()->getSchema()->quoteTableName($alias) : $alias;
	}

	/**
	 * Sets the table alias to be used in queries.
	 * @param string $alias the table alias to be used in queries. The alias should NOT be quoted.
	 * @since 1.1.3
	 */
	public function setTableAlias($alias)
	{
		$this->_alias=$alias;
	}

	/**
	 * Finds a single active record with the specified condition.
	 * @param mixed $condition query condition or criteria.
	 * If a string, it is treated as query condition (the WHERE clause);
	 * If an array, it is treated as the initial values for constructing a {@link CDbCriteria} object;
	 * Otherwise, it should be an instance of {@link CDbCriteria}.
	 * @param array $params parameters to be bound to an SQL statement.
	 * This is only used when the first parameter is a string (query condition).
	 * In other cases, please use {@link CDbCriteria::params} to set parameters.
	 * @return CActiveRecord the record found. Null if no record is found.
	 */
	public function find($condition='',$params=array())
	{
		Yii::trace(get_class($this).'.find()','system.db.ar.CActiveRecord');
		$criteria=$this->getCommandBuilder()->createCriteria($condition,$params);
		return $this->query($criteria);
	}

	/**
	 * Finds all active records satisfying the specified condition.
	 * See {@link find()} for detailed explanation about $condition and $params.
	 * @param mixed $condition query condition or criteria.
	 * @param array $params parameters to be bound to an SQL statement.
	 * @return array list of active records satisfying the specified condition. An empty array is returned if none is found.
	 */
	public function findAll($condition='',$params=array())
	{
		Yii::trace(get_class($this).'.findAll()','system.db.ar.CActiveRecord');
		$criteria=$this->getCommandBuilder()->createCriteria($condition,$params);
		return $this->query($criteria,true);
	}

	/**
	 * Finds a single active record with the specified primary key.
	 * See {@link find()} for detailed explanation about $condition and $params.
	 * @param mixed $pk primary key value(s). Use array for multiple primary keys. For composite key, each key value must be an array (column name=>column value).
	 * @param mixed $condition query condition or criteria.
	 * @param array $params parameters to be bound to an SQL statement.
	 * @return CActiveRecord the record found. Null if none is found.
	 */
	public function findByPk($pk,$condition='',$params=array())
	{
		Yii::trace(get_class($this).'.findByPk()','system.db.ar.CActiveRecord');
		$prefix=$this->getTableAlias(true).'.';
		$criteria=$this->getCommandBuilder()->createPkCriteria($this->getTableSchema(),$pk,$condition,$params,$prefix);
		return $this->query($criteria);
	}

	/**
	 * Finds all active records with the specified primary keys.
	 * See {@link find()} for detailed explanation about $condition and $params.
	 * @param mixed $pk primary key value(s). Use array for multiple primary keys. For composite key, each key value must be an array (column name=>column value).
	 * @param mixed $condition query condition or criteria.
	 * @param array $params parameters to be bound to an SQL statement.
	 * @return array the records found. An empty array is returned if none is found.
	 */
	public function findAllByPk($pk,$condition='',$params=array())
	{
		Yii::trace(get_class($this).'.findAllByPk()','system.db.ar.CActiveRecord');
		$prefix=$this->getTableAlias(true).'.';
		$criteria=$this->getCommandBuilder()->createPkCriteria($this->getTableSchema(),$pk,$condition,$params,$prefix);
		return $this->query($criteria,true);
	}

	/**
	 * Finds a single active record that has the specified attribute values.
	 * See {@link find()} for detailed explanation about $condition and $params.
	 * @param array $attributes list of attribute values (indexed by attribute names) that the active records should match.
	 * An attribute value can be an array which will be used to generate an IN condition.
	 * @param mixed $condition query condition or criteria.
	 * @param array $params parameters to be bound to an SQL statement.
	 * @return CActiveRecord the record found. Null if none is found.
	 */
	public function findByAttributes($attributes,$condition='',$params=array())
	{
		Yii::trace(get_class($this).'.findByAttributes()','system.db.ar.CActiveRecord');
		$prefix=$this->getTableAlias(true).'.';
		$criteria=$this->getCommandBuilder()->createColumnCriteria($this->getTableSchema(),$attributes,$condition,$params,$prefix);
		return $this->query($criteria);
	}

	/**
	 * Finds all active records that have the specified attribute values.
	 * See {@link find()} for detailed explanation about $condition and $params.
	 * @param array $attributes list of attribute values (indexed by attribute names) that the active records should match.
	 * An attribute value can be an array which will be used to generate an IN condition.
	 * @param mixed $condition query condition or criteria.
	 * @param array $params parameters to be bound to an SQL statement.
	 * @return array the records found. An empty array is returned if none is found.
	 */
	public function findAllByAttributes($attributes,$condition='',$params=array())
	{
		Yii::trace(get_class($this).'.findAllByAttributes()','system.db.ar.CActiveRecord');
		$prefix=$this->getTableAlias(true).'.';
		$criteria=$this->getCommandBuilder()->createColumnCriteria($this->getTableSchema(),$attributes,$condition,$params,$prefix);
		return $this->query($criteria,true);
	}

	/**
	 * Finds a single active record with the specified SQL statement.
	 * @param string $sql the SQL statement
	 * @param array $params parameters to be bound to the SQL statement
	 * @return CActiveRecord the record found. Null if none is found.
	 */
	public function findBySql($sql,$params=array())
	{
		Yii::trace(get_class($this).'.findBySql()','system.db.ar.CActiveRecord');
		$this->beforeFind();
		if(($criteria=$this->getDbCriteria(false))!==null && !empty($criteria->with))
		{
			$this->_c=null;
			$finder=new CActiveFinder($this,$criteria->with);
			return $finder->findBySql($sql,$params);
		}
		else
		{
			$command=$this->getCommandBuilder()->createSqlCommand($sql,$params);
			return $this->populateRecord($command->queryRow());
		}
	}

	/**
	 * Finds all active records using the specified SQL statement.
	 * @param string $sql the SQL statement
	 * @param array $params parameters to be bound to the SQL statement
	 * @return array the records found. An empty array is returned if none is found.
	 */
	public function findAllBySql($sql,$params=array())
	{
		Yii::trace(get_class($this).'.findAllBySql()','system.db.ar.CActiveRecord');
		$this->beforeFind();
		if(($criteria=$this->getDbCriteria(false))!==null && !empty($criteria->with))
		{
			$this->_c=null;
			$finder=new CActiveFinder($this,$criteria->with);
			return $finder->findAllBySql($sql,$params);
		}
		else
		{
			$command=$this->getCommandBuilder()->createSqlCommand($sql,$params);
			return $this->populateRecords($command->queryAll());
		}
	}

	/**
	 * Finds the number of rows satisfying the specified query condition.
	 * See {@link find()} for detailed explanation about $condition and $params.
	 * @param mixed $condition query condition or criteria.
	 * @param array $params parameters to be bound to an SQL statement.
	 * @return string the number of rows satisfying the specified query condition. Note: type is string to keep max. precision.
	 */
	public function count($condition='',$params=array())
	{
		Yii::trace(get_class($this).'.count()','system.db.ar.CActiveRecord');
		$builder=$this->getCommandBuilder();
		$criteria=$builder->createCriteria($condition,$params);
		$this->applyScopes($criteria);

		if(empty($criteria->with))
			return $builder->createCountCommand($this->getTableSchema(),$criteria)->queryScalar();
		else
		{
			$finder=new CActiveFinder($this,$criteria->with);
			return $finder->count($criteria);
		}
	}

	/**
	 * Finds the number of rows that have the specified attribute values.
	 * See {@link find()} for detailed explanation about $condition and $params.
	 * @param array $attributes list of attribute values (indexed by attribute names) that the active records should match.
	 * An attribute value can be an array which will be used to generate an IN condition.
	 * @param mixed $condition query condition or criteria.
	 * @param array $params parameters to be bound to an SQL statement.
	 * @return string the number of rows satisfying the specified query condition. Note: type is string to keep max. precision.
	 * @since 1.1.4
	 */
	public function countByAttributes($attributes,$condition='',$params=array())
	{
		Yii::trace(get_class($this).'.countByAttributes()','system.db.ar.CActiveRecord');
		$prefix=$this->getTableAlias(true).'.';
		$builder=$this->getCommandBuilder();
		$criteria=$builder->createColumnCriteria($this->getTableSchema(),$attributes,$condition,$params,$prefix);
		$this->applyScopes($criteria);

		if(empty($criteria->with))
			return $builder->createCountCommand($this->getTableSchema(),$criteria)->queryScalar();
		else
		{
			$finder=new CActiveFinder($this,$criteria->with);
			return $finder->count($criteria);
		}
	}

	/**
	 * Finds the number of rows using the given SQL statement.
	 * This is equivalent to calling {@link CDbCommand::queryScalar} with the specified
	 * SQL statement and the parameters.
	 * @param string $sql the SQL statement
	 * @param array $params parameters to be bound to the SQL statement
	 * @return string the number of rows using the given SQL statement. Note: type is string to keep max. precision.
	 */
	public function countBySql($sql,$params=array())
	{
		Yii::trace(get_class($this).'.countBySql()','system.db.ar.CActiveRecord');
		return $this->getCommandBuilder()->createSqlCommand($sql,$params)->queryScalar();
	}

	/**
	 * Checks whether there is row satisfying the specified condition.
	 * See {@link find()} for detailed explanation about $condition and $params.
	 * @param mixed $condition query condition or criteria.
	 * @param array $params parameters to be bound to an SQL statement.
	 * @return boolean whether there is row satisfying the specified condition.
	 */
	public function exists($condition='',$params=array())
	{
		Yii::trace(get_class($this).'.exists()','system.db.ar.CActiveRecord');
		$builder=$this->getCommandBuilder();
		$criteria=$builder->createCriteria($condition,$params);
		$table=$this->getTableSchema();
		$criteria->select='1';
		$criteria->limit=1;
		$this->applyScopes($criteria);

		if(empty($criteria->with))
			return $builder->createFindCommand($table,$criteria)->queryRow()!==false;
		else
		{
			$criteria->select='*';
			$finder=new CActiveFinder($this,$criteria->with);
			return $finder->count($criteria)>0;
		}
	}

	/**
	 * Specifies which related objects should be eagerly loaded.
	 * This method takes variable number of parameters. Each parameter specifies
	 * the name of a relation or child-relation. For example,
	 * <pre>
	 * // find all posts together with their author and comments
	 * Post::model()->with('author','comments')->findAll();
	 * // find all posts together with their author and the author's profile
	 * Post::model()->with('author','author.profile')->findAll();
	 * </pre>
	 * The relations should be declared in {@link relations()}.
	 *
	 * By default, the options specified in {@link relations()} will be used
	 * to do relational query. In order to customize the options on the fly,
	 * we should pass an array parameter to the with() method. The array keys
	 * are relation names, and the array values are the corresponding query options.
	 * For example,
	 * <pre>
	 * Post::model()->with(array(
	 *     'author'=>array('select'=>'id, name'),
	 *     'comments'=>array('condition'=>'approved=1', 'order'=>'create_time'),
	 * ))->findAll();
	 * </pre>
	 *
	 * @return CActiveRecord the AR object itself.
	 */
	public function with()
	{
		if(func_num_args()>0)
		{
			$with=func_get_args();
			if(is_array($with[0]))  // the parameter is given as an array
				$with=$with[0];
			if(!empty($with))
				$this->getDbCriteria()->mergeWith(array('with'=>$with));
		}
		return $this;
	}

	/**
	 * Sets {@link CDbCriteria::together} property to be true.
	 * This is only used in relational AR query. Please refer to {@link CDbCriteria::together}
	 * for more details.
	 * @return CActiveRecord the AR object itself
	 * @since 1.1.4
	 */
	public function together()
	{
		$this->getDbCriteria()->together=true;
		return $this;
	}

	/**
	 * Updates records with the specified primary key(s).
	 * See {@link find()} for detailed explanation about $condition and $params.
	 * Note, the attributes are not checked for safety and validation is NOT performed.
	 * @param mixed $pk primary key value(s). Use array for multiple primary keys. For composite key, each key value must be an array (column name=>column value).
	 * @param array $attributes list of attributes (name=>$value) to be updated
	 * @param mixed $condition query condition or criteria.
	 * @param array $params parameters to be bound to an SQL statement.
	 * @return integer the number of rows being updated
	 */
	public function updateByPk($pk,$attributes,$condition='',$params=array())
	{
		Yii::trace(get_class($this).'.updateByPk()','system.db.ar.CActiveRecord');
		$builder=$this->getCommandBuilder();
		$table=$this->getTableSchema();
		$criteria=$builder->createPkCriteria($table,$pk,$condition,$params);
		$command=$builder->createUpdateCommand($table,$attributes,$criteria);
		return $command->execute();
	}

	/**
	 * Updates records with the specified condition.
	 * See {@link find()} for detailed explanation about $condition and $params.
	 * Note, the attributes are not checked for safety and no validation is done.
	 * @param array $attributes list of attributes (name=>$value) to be updated
	 * @param mixed $condition query condition or criteria.
	 * @param array $params parameters to be bound to an SQL statement.
	 * @return integer the number of rows being updated
	 */
	public function updateAll($attributes,$condition='',$params=array())
	{
		Yii::trace(get_class($this).'.updateAll()','system.db.ar.CActiveRecord');
		$builder=$this->getCommandBuilder();
		$criteria=$builder->createCriteria($condition,$params);
		$command=$builder->createUpdateCommand($this->getTableSchema(),$attributes,$criteria);
		return $command->execute();
	}

	/**
	 * Updates one or several counter columns.
	 * Note, this updates all rows of data unless a condition or criteria is specified.
	 * See {@link find()} for detailed explanation about $condition and $params.
	 * @param array $counters the counters to be updated (column name=>increment value)
	 * @param mixed $condition query condition or criteria.
	 * @param array $params parameters to be bound to an SQL statement.
	 * @return integer the number of rows being updated
	 * @see saveCounters
	 */
	public function updateCounters($counters,$condition='',$params=array())
	{
		Yii::trace(get_class($this).'.updateCounters()','system.db.ar.CActiveRecord');
		$builder=$this->getCommandBuilder();
		$criteria=$builder->createCriteria($condition,$params);
		$command=$builder->createUpdateCounterCommand($this->getTableSchema(),$counters,$criteria);
		return $command->execute();
	}

	/**
	 * Deletes rows with the specified primary key.
	 * See {@link find()} for detailed explanation about $condition and $params.
	 * @param mixed $pk primary key value(s). Use array for multiple primary keys. For composite key, each key value must be an array (column name=>column value).
	 * @param mixed $condition query condition or criteria.
	 * @param array $params parameters to be bound to an SQL statement.
	 * @return integer the number of rows deleted
	 */
	public function deleteByPk($pk,$condition='',$params=array())
	{
		Yii::trace(get_class($this).'.deleteByPk()','system.db.ar.CActiveRecord');
		$builder=$this->getCommandBuilder();
		$criteria=$builder->createPkCriteria($this->getTableSchema(),$pk,$condition,$params);
		$command=$builder->createDeleteCommand($this->getTableSchema(),$criteria);
		return $command->execute();
	}

	/**
	 * Deletes rows with the specified condition.
	 * See {@link find()} for detailed explanation about $condition and $params.
	 * @param mixed $condition query condition or criteria.
	 * @param array $params parameters to be bound to an SQL statement.
	 * @return integer the number of rows deleted
	 */
	public function deleteAll($condition='',$params=array())
	{
		Yii::trace(get_class($this).'.deleteAll()','system.db.ar.CActiveRecord');
		$builder=$this->getCommandBuilder();
		$criteria=$builder->createCriteria($condition,$params);
		$command=$builder->createDeleteCommand($this->getTableSchema(),$criteria);
		return $command->execute();
	}

	/**
	 * Deletes rows which match the specified attribute values.
	 * See {@link find()} for detailed explanation about $condition and $params.
	 * @param array $attributes list of attribute values (indexed by attribute names) that the active records should match.
	 * An attribute value can be an array which will be used to generate an IN condition.
	 * @param mixed $condition query condition or criteria.
	 * @param array $params parameters to be bound to an SQL statement.
	 * @return integer number of rows affected by the execution.
	 */
	public function deleteAllByAttributes($attributes,$condition='',$params=array())
	{
		Yii::trace(get_class($this).'.deleteAllByAttributes()','system.db.ar.CActiveRecord');
		$builder=$this->getCommandBuilder();
		$table=$this->getTableSchema();
		$criteria=$builder->createColumnCriteria($table,$attributes,$condition,$params);
		$command=$builder->createDeleteCommand($table,$criteria);
		return $command->execute();
	}

	/**
	 * Creates an active record with the given attributes.
	 * This method is internally used by the find methods.
	 * @param array $attributes attribute values (column name=>column value)
	 * @param boolean $callAfterFind whether to call {@link afterFind} after the record is populated.
	 * @return CActiveRecord the newly created active record. The class of the object is the same as the model class.
	 * Null is returned if the input data is false.
	 */
	public function populateRecord($attributes,$callAfterFind=true)
	{
		if($attributes!==false)
		{
			$record=$this->instantiate($attributes);
			$record->setScenario('update');
			$record->init();
			$md=$record->getMetaData();
			foreach($attributes as $name=>$value)
			{
				if(property_exists($record,$name))
					$record->$name=$value;
				else if(isset($md->columns[$name]))
					$record->_attributes[$name]=$value;
			}
			$record->_pk=$record->getPrimaryKey();
			$record->attachBehaviors($record->behaviors());
			if($callAfterFind)
				$record->afterFind();
			return $record;
		}
		else
			return null;
	}

	/**
	 * Creates a list of active records based on the input data.
	 * This method is internally used by the find methods.
	 * @param array $data list of attribute values for the active records.
	 * @param boolean $callAfterFind whether to call {@link afterFind} after each record is populated.
	 * @param string $index the name of the attribute whose value will be used as indexes of the query result array.
	 * If null, it means the array will be indexed by zero-based integers.
	 * @return array list of active records.
	 */
	public function populateRecords($data,$callAfterFind=true,$index=null)
	{
		$records=array();
		foreach($data as $attributes)
		{
			if(($record=$this->populateRecord($attributes,$callAfterFind))!==null)
			{
				if($index===null)
					$records[]=$record;
				else
					$records[$record->$index]=$record;
			}
		}
		return $records;
	}

	/**
	 * Creates an active record instance.
	 * This method is called by {@link populateRecord} and {@link populateRecords}.
	 * You may override this method if the instance being created
	 * depends the attributes that are to be populated to the record.
	 * For example, by creating a record based on the value of a column,
	 * you may implement the so-called single-table inheritance mapping.
	 * @param array $attributes list of attribute values for the active records.
	 * @return CActiveRecord the active record
	 */
	protected function instantiate($attributes)
	{
		$class=get_class($this);
		$model=new $class(null);
		return $model;
	}

	/**
	 * Returns whether there is an element at the specified offset.
	 * This method is required by the interface ArrayAccess.
	 * @param mixed $offset the offset to check on
	 * @return boolean
	 */
	public function offsetExists($offset)
	{
		return $this->__isset($offset);
	}
}


/**
 * CBaseActiveRelation is the base class for all active relations.
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @version $Id$
 * @package system.db.ar
 */
class CBaseActiveRelation extends CComponent
{
	/**
	 * @var string name of the related object
	 */
	public $name;
	/**
	 * @var string name of the related active record class
	 */
	public $className;
	/**
	 * @var mixed the foreign key in this relation
	 */
	public $foreignKey;
	/**
	 * @var mixed list of column names (an array, or a string of names separated by commas) to be selected.
	 * Do not quote or prefix the column names unless they are used in an expression.
	 * In that case, you should prefix the column names with 'relationName.'.
	 */
	public $select='*';
	/**
	 * @var string WHERE clause. For {@link CActiveRelation} descendant classes, column names
	 * referenced in the condition should be disambiguated with prefix 'relationName.'.
	 */
	public $condition='';
	/**
	 * @var array the parameters that are to be bound to the condition.
	 * The keys are parameter placeholder names, and the values are parameter values.
	 */
	public $params=array();
	/**
	 * @var string GROUP BY clause. For {@link CActiveRelation} descendant classes, column names
	 * referenced in this property should be disambiguated with prefix 'relationName.'.
	 */
	public $group='';
	/**
	 * @var string how to join with other tables. This refers to the JOIN clause in an SQL statement.
	 * For example, <code>'LEFT JOIN users ON users.id=authorID'</code>.
	 * @since 1.1.3
	 */
	public $join='';
	/**
	 * @var string HAVING clause. For {@link CActiveRelation} descendant classes, column names
	 * referenced in this property should be disambiguated with prefix 'relationName.'.
	 */
	public $having='';
	/**
	 * @var string ORDER BY clause. For {@link CActiveRelation} descendant classes, column names
	 * referenced in this property should be disambiguated with prefix 'relationName.'.
	 */
	public $order='';

	/**
	 * Constructor.
	 * @param string $name name of the relation
	 * @param string $className name of the related active record class
	 * @param string $foreignKey foreign key for this relation
	 * @param array $options additional options (name=>value). The keys must be the property names of this class.
	 */
	public function __construct($name,$className,$foreignKey,$options=array())
	{
		$this->name=$name;
		$this->className=$className;
		$this->foreignKey=$foreignKey;
		foreach($options as $name=>$value)
			$this->$name=$value;
	}

	/**
	 * Merges this relation with a criteria specified dynamically.
	 * @param array $criteria the dynamically specified criteria
	 * @param boolean $fromScope whether the criteria to be merged is from scopes
	 */
	public function mergeWith($criteria,$fromScope=false)
	{
		if($criteria instanceof CDbCriteria)
			$criteria=$criteria->toArray();
		if(isset($criteria['select']) && $this->select!==$criteria['select'])
		{
			if($this->select==='*')
				$this->select=$criteria['select'];
			else if($criteria['select']!=='*')
			{
				$select1=is_string($this->select)?preg_split('/\s*,\s*/',trim($this->select),-1,PREG_SPLIT_NO_EMPTY):$this->select;
				$select2=is_string($criteria['select'])?preg_split('/\s*,\s*/',trim($criteria['select']),-1,PREG_SPLIT_NO_EMPTY):$criteria['select'];
				$this->select=array_merge($select1,array_diff($select2,$select1));
			}
		}

		if(isset($criteria['condition']) && $this->condition!==$criteria['condition'])
		{
			if($this->condition==='')
				$this->condition=$criteria['condition'];
			else if($criteria['condition']!=='')
				$this->condition="({$this->condition}) AND ({$criteria['condition']})";
		}

		if(isset($criteria['params']) && $this->params!==$criteria['params'])
			$this->params=array_merge($this->params,$criteria['params']);

		if(isset($criteria['order']) && $this->order!==$criteria['order'])
		{
			if($this->order==='')
				$this->order=$criteria['order'];
			else if($criteria['order']!=='')
				$this->order=$criteria['order'].', '.$this->order;
		}

		if(isset($criteria['group']) && $this->group!==$criteria['group'])
		{
			if($this->group==='')
				$this->group=$criteria['group'];
			else if($criteria['group']!=='')
				$this->group.=', '.$criteria['group'];
		}

		if(isset($criteria['join']) && $this->join!==$criteria['join'])
		{
			if($this->join==='')
				$this->join=$criteria['join'];
			else if($criteria['join']!=='')
				$this->join.=' '.$criteria['join'];
		}

		if(isset($criteria['having']) && $this->having!==$criteria['having'])
		{
			if($this->having==='')
				$this->having=$criteria['having'];
			else if($criteria['having']!=='')
				$this->having="({$this->having}) AND ({$criteria['having']})";
		}
	}
}


/**
 * CStatRelation represents a statistical relational query.
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @version $Id$
 * @package system.db.ar
 */
class CStatRelation extends CBaseActiveRelation
{
	/**
	 * @var string the statistical expression. Defaults to 'COUNT(*)', meaning
	 * the count of child objects.
	 */
	public $select='COUNT(*)';
	/**
	 * @var mixed the default value to be assigned to those records that do not
	 * receive a statistical query result. Defaults to 0.
	 */
	public $defaultValue=0;

	/**
	 * Merges this relation with a criteria specified dynamically.
	 * @param array $criteria the dynamically specified criteria
	 * @param boolean $fromScope whether the criteria to be merged is from scopes
	 */
	public function mergeWith($criteria,$fromScope=false)
	{
		if($criteria instanceof CDbCriteria)
			$criteria=$criteria->toArray();
		parent::mergeWith($criteria,$fromScope);

		if(isset($criteria['defaultValue']))
			$this->defaultValue=$criteria['defaultValue'];
	}
}


/**
 * CActiveRelation is the base class for representing active relations that bring back related objects.
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @version $Id$
 * @package system.db.ar
 * @since 1.0
 */
class CActiveRelation extends CBaseActiveRelation
{
	/**
	 * @var string join type. Defaults to 'LEFT OUTER JOIN'.
	 */
	public $joinType='LEFT OUTER JOIN';
	/**
	 * @var string ON clause. The condition specified here will be appended to the joining condition using AND operator.
	 */
	public $on='';
	/**
	 * @var string the alias for the table that this relation refers to. Defaults to null, meaning
	 * the alias will be the same as the relation name.
	 */
	public $alias;
	/**
	 * @var string|array specifies which related objects should be eagerly loaded when this related object is lazily loaded.
	 * For more details about this property, see {@link CActiveRecord::with()}.
	 */
	public $with=array();
	/**
	 * @var boolean whether this table should be joined with the primary table.
	 * When setting this property to be false, the table associated with this relation will
	 * appear in a separate JOIN statement.
	 * If this property is set true, then the corresponding table will ALWAYS be joined together
	 * with the primary table, no matter the primary table is limited or not.
	 * If this property is not set, the corresponding table will be joined with the primary table
	 * only when the primary table is not limited.
	 */
	public $together;
	/**
	 * @var mixed scopes to apply
	 * Can be set to the one of the following:
	 * <ul>
	 * <li>Single scope: 'scopes'=>'scopeName'.</li>
	 * <li>Multiple scopes: 'scopes'=>array('scopeName1','scopeName2').</li>
	 * </ul>
	 * @since 1.1.9
	 */
	 public $scopes;

	/**
	 * Merges this relation with a criteria specified dynamically.
	 * @param array $criteria the dynamically specified criteria
	 * @param boolean $fromScope whether the criteria to be merged is from scopes
	 */
	public function mergeWith($criteria,$fromScope=false)
	{
		if($criteria instanceof CDbCriteria)
			$criteria=$criteria->toArray();
		if($fromScope)
		{
			if(isset($criteria['condition']) && $this->on!==$criteria['condition'])
			{
				if($this->on==='')
					$this->on=$criteria['condition'];
				else if($criteria['condition']!=='')
					$this->on="({$this->on}) AND ({$criteria['condition']})";
			}
			unset($criteria['condition']);
		}

		parent::mergeWith($criteria);

		if(isset($criteria['joinType']))
			$this->joinType=$criteria['joinType'];

		if(isset($criteria['on']) && $this->on!==$criteria['on'])
		{
			if($this->on==='')
				$this->on=$criteria['on'];
			else if($criteria['on']!=='')
				$this->on="({$this->on}) AND ({$criteria['on']})";
		}

		if(isset($criteria['with']))
			$this->with=$criteria['with'];

		if(isset($criteria['alias']))
			$this->alias=$criteria['alias'];

		if(isset($criteria['together']))
			$this->together=$criteria['together'];
	}
}


/**
 * CBelongsToRelation represents the parameters specifying a BELONGS_TO relation.
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @version $Id$
 * @package system.db.ar
 * @since 1.0
 */
class CBelongsToRelation extends CActiveRelation
{
}


/**
 * CHasOneRelation represents the parameters specifying a HAS_ONE relation.
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @version $Id$
 * @package system.db.ar
 * @since 1.0
 */
class CHasOneRelation extends CActiveRelation
{
	/**
	 * @var string the name of the relation that should be used as the bridge to this relation.
	 * Defaults to null, meaning don't use any bridge.
	 * @since 1.1.7
	 */
	public $through;
}


/**
 * CHasManyRelation represents the parameters specifying a HAS_MANY relation.
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @version $Id$
 * @package system.db.ar
 * @since 1.0
 */
class CHasManyRelation extends CActiveRelation
{
	/**
	 * @var integer limit of the rows to be selected. It is effective only for lazy loading this related object. Defaults to -1, meaning no limit.
	 */
	public $limit=-1;
	/**
	 * @var integer offset of the rows to be selected. It is effective only for lazy loading this related object. Defaults to -1, meaning no offset.
	 */
	public $offset=-1;
	/**
	 * @var string the name of the column that should be used as the key for storing related objects.
	 * Defaults to null, meaning using zero-based integer IDs.
	 */
	public $index;
	/**
	 * @var string the name of the relation that should be used as the bridge to this relation.
	 * Defaults to null, meaning don't use any bridge.
	 * @since 1.1.7
	 */
	public $through;

	/**
	 * Merges this relation with a criteria specified dynamically.
	 * @param array $criteria the dynamically specified criteria
	 * @param boolean $fromScope whether the criteria to be merged is from scopes
	 */
	public function mergeWith($criteria,$fromScope=false)
	{
		if($criteria instanceof CDbCriteria)
			$criteria=$criteria->toArray();
		parent::mergeWith($criteria,$fromScope);
		if(isset($criteria['limit']) && $criteria['limit']>0)
			$this->limit=$criteria['limit'];

		if(isset($criteria['offset']) && $criteria['offset']>=0)
			$this->offset=$criteria['offset'];

		if(isset($criteria['index']))
			$this->index=$criteria['index'];
	}
}


/**
 * CManyManyRelation represents the parameters specifying a MANY_MANY relation.
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @version $Id$
 * @package system.db.ar
 * @since 1.0
 */
class CManyManyRelation extends CHasManyRelation
{
}


/**
 * CActiveRecordMetaData represents the meta-data for an Active Record class.
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @version $Id$
 * @package system.db.ar
 * @since 1.0
 */
class CActiveRecordMetaData
{
	/**
	 * @var CDbTableSchema the table schema information
	 */
	public $tableSchema;
	/**
	 * @var array table columns
	 */
	public $columns;
	/**
	 * @var array list of relations
	 */
	public $relations=array();
	/**
	 * @var array attribute default values
	 */
	public $attributeDefaults=array();

	private $_model;

	/**
	 * Constructor.
	 * @param CActiveRecord $model the model instance
	 */
	public function __construct($model)
	{
		$this->_model=$model;

		$tableName=$model->tableName();
		if(($table=$model->getDbConnection()->getSchema()->getTable($tableName))===null)
			throw new CDbException(Yii::t('yii','The table "{table}" for active record class "{class}" cannot be found in the database.',
				array('{class}'=>get_class($model),'{table}'=>$tableName)));
		if($table->primaryKey===null)
		{
			$table->primaryKey=$model->primaryKey();
			if(is_string($table->primaryKey) && isset($table->columns[$table->primaryKey]))
				$table->columns[$table->primaryKey]->isPrimaryKey=true;
			else if(is_array($table->primaryKey))
			{
				foreach($table->primaryKey as $name)
				{
					if(isset($table->columns[$name]))
						$table->columns[$name]->isPrimaryKey=true;
				}
			}
		}
		$this->tableSchema=$table;
		$this->columns=$table->columns;

		foreach($table->columns as $name=>$column)
		{
			if(!$column->isPrimaryKey && $column->defaultValue!==null)
				$this->attributeDefaults[$name]=$column->defaultValue;
		}

		foreach($model->relations() as $name=>$config)
		{
			$this->addRelation($name,$config);
		}
	}

	/**
	 * Adds a relation.
	 *
	 * $config is an array with three elements:
	 * relation type, the related active record class and the foreign key.
	 *
	 * @throws CDbException
	 * @param string $name $name Name of the relation.
	 * @param array $config $config Relation parameters.
     * @return void
	 * @since 1.1.2
	 */
	public function addRelation($name,$config)
	{
		if(isset($config[0],$config[1],$config[2]))  // relation class, AR class, FK
			$this->relations[$name]=new $config[0]($name,$config[1],$config[2],array_slice($config,3));
		else
			throw new CDbException(Yii::t('yii','Active record "{class}" has an invalid configuration for relation "{relation}". It must specify the relation type, the related active record class and the foreign key.', array('{class}'=>get_class($this->_model),'{relation}'=>$name)));
	}

	/**
	 * Checks if there is a relation with specified name defined.
	 *
	 * @param string $name $name Name of the relation.
	 * @return boolean
	 * @since 1.1.2
	 */
	public function hasRelation($name)
	{
		return isset($this->relations[$name]);
	}

	/**
	 * Deletes a relation with specified name.
	 *
	 * @param string $name $name
	 * @return void
	 * @since 1.1.2
	 */
	public function removeRelation($name)
	{
		unset($this->relations[$name]);
	}
}