# baseten / Sources / BaseTen.h

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LLC. // // Before using this software, please review the available licensing options // by visiting http://basetenframework.org/licensing/ or by contacting // us at sales@karppinen.fi. Without an additional license, this software // may be distributed only in compliance with the GNU General Public License. // // // This program is free software; you can redistribute it and/or modify // it under the terms of the GNU General Public License, version 2.0, // as published by the Free Software Foundation. // // This program is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // // You should have received a copy of the GNU General Public License // along with this program; if not, write to the Free Software // Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA // // $Id$ // #import #import #import #import #import #import #import #import #import #import #import /* * Helpful breakpoints: * * BXHandleError2 * bx_error_during_rollback * bx_error_during_clear_notification * bx_test_failed * pgts_unrecognized_selector */ /** * \defgroup baseten BaseTen * BaseTen is linked to Foundation, CoreData, Security, IOKit and SystemConfiguration frameworks and * libcrypto, libssl and libstdc++ dynamic libraries. In addition, it is weakly linked to AppKit framework. * Therefore it can be used to develop applications that don't require the graphical user interface. */ /** * \defgroup descriptions Descriptions * \ingroup baseten * Database introspection. */ /** * \defgroup auto_containers Self-updating collections * \ingroup baseten * Collections updated by the database context. * The context will change the collection's contents according to its filter predicate * after each relevant modification to the database. */ /** * \mainpage Introduction * * BaseTen is an open source Cocoa database framework for working with PostgreSQL databases. BaseTen * has been designed with familiar, Core Data -like semantics and APIs. * * The BaseTen feature highlights include: * \li BaseTen Assistant imports Core Data / Xcode data models. * \li Discovers the database schema automatically at runtime, including 1-1, 1-many and many-many relationships. * \li Database changes are propagated to clients automatically, without polling. * \li In-memory database objects are uniqued, and objects fetched via relationships are faults by default. * \li Support for RDBMS features like database-driven data validation, multi-column primary keys and updateable views. * \li Autocommit and manual save/rollback modes, both with NSUndoManager integration. * \li A BaseTen-aware NSArrayController subclass automates locking and change propagation. * \li Fetches are specified with NSPredicates (the relevant portions of which are evaluated on the database). */ /** * \page general_usage Using BaseTen framework * * \latexonly \section*{Topics} \endlatexonly * \li \subpage overview * \li \subpage baseten_assistant * \li \subpage getting_started * \li \subpage accessing_values * \li \subpage sql_views * \li \subpage database_types * \li \subpage relationships * \li \subpage predicates * \li \subpage tracking_changes * \li \subpage using_appkit_classes * \li \subpage autocommit_manual_commit * \li \subpage thread_safety * \li \subpage multiple_contexts * \li \subpage linking_to_baseten * \li \subpage building_baseten */ /** * \page overview Overview of BaseTen * * BaseTen aims to provide a Core Data -like API for handling a database. A database connection is managed * by an instance of BXDatabaseContext, which also fetches rows from the database. Rows are represented * by instances of BXDatabaseObject. Objects are identified by * \link BXDatabaseObjectID BXDatabaseObjectIDs\endlink, that are created using * tables' primary keys. Foreign keys are interpreted as relationships between objects. * * Like some other object-relational mappers, BaseTen fetches the data model from the database. * There are classes available for database introspection: BXEntityDescription, BXAttributeDescription, * BXRelationshipDescription and its subclasses. * * Database objects are retrieved using an instance of BXDatabaseContext. The rows are specified using * instances of BXEntityDescription and NSPredicate. This pattern should match most use cases. It is also * possible to fetch rows as NSDictionaries by specifying an SQL query. * * Unlike the typical use case of Core Data, multiple users might be connected to the database being * accessed using BaseTen. Thus, data manipulated with database objects could change at any time. BaseTen * copes with this situation by updating objects' contents as soon as other database clients commit their * changes. The other clients needn't use BaseTen. * * Instead of constantly polling the database for changes, BaseTen listens for PostgreSQL notifications. * It then queries the database about the notification type and faults the relevant objects. For this to * work, certain tables, views and functions need to be created in the database. The easiest way to do this * is to connect to the database with BaseTen Assistant. Using it, relations may be enabled for use with * the framework. Everything will be installed or will reference to a database schema called baseten, so * removal, if needed, will be an easy process. BaseTen can connect to databases without the schema, but * in this case functionality will be limited. * * Since BaseTen relies on database introspection, SQL may be used to define the database schema. * Another option is to create a data model using Xcode's data modeler and import it using BaseTen Assistant. * * \image html object-relationships.png "Relationships between BaseTen's objects" * \image html class-hierarchy.png "BaseTen class hierarchy" * \image latex object-relationships.pdf "Relationships between BaseTen's objects" width=\textwidth * \image latex class-hierarchy.pdf "BaseTen class hierarchy" width=\textwidth */ /** * \page baseten_assistant BaseTen Assistant * * BaseTen Assistant is a simple database management application distributed with BaseTen framework. It has its own help that is available from within the application. * In short, it has the following features: * \li It can be used to enable or disable tables and views for use with BaseTen. * \li It can refresh the tables that BaseTen uses to determine relationships between entities. * \li It can list entities' attributes and relationships as they are available when using the framework. * \li It can create a database schema from an Xcode data model. * \li It can create a chart of the database schema that can be displayed using Graphviz or OmniGraffle. */ /** * \page getting_started Getting started * * Typically accessing a database consists roughly of the following steps: *
*
• \ref creating_a_database_context "Creating an instance of BXDatabaseContext"
• *
• \ref connecting_to_a_database "Connecting to a database"
• *
• \ref getting_an_entity_and_a_predicate "Getting an entity description from the context and possibly creating an NSPredicate for reducing the number of fetched objects"
• *
• \ref performing_a_fetch "Performing a fetch using the entity and the predicate"
• *
• \ref handling_the_results "Handling the results"
• *
• \ref creating_objects "Creating new objects"
• *
* Here is a small walkthrough with sample code. More examples are available in the BaseTen Subversion repository and at http://basetenframework.org. * * \latexonly * \lstset{language=[Objective]C, backgroundcolor=\color[rgb]{0.84,0.87,0.90}, rulecolor=\color[gray]{0.53}, frame=single, framesep=0pt, framextopmargin=2pt, framexbottommargin=2pt, fontadjust, columns=fullflexible, captionpos=b} * \begin{lstlisting}[caption=A simple command line tool that uses BaseTen] * #import * #import * * int main (int argc, char** argv) * { * NSURL* databaseURI = [NSURL URLWithString: @"pgsql://username@localhost/database"]; * BXDatabaseContext* ctx = [[BXDatabaseContext alloc] initWithDatabaseURI: databaseURI]; * * [ctx connectSync: NULL]; * BXEntityDescription* entity = [[ctx databaseObjectModel] entityForTable: @"table"]; * NSArray* result = [ctx executeFetchForEntity: entity withPredicate: nil error: NULL]; * * for (BXDatabaseObject* object in result) * { * NSLog (@"Object ID: %@ column: %@", * [[object objectID] URIRepresentation], [object valueForKey: @"column"]); * } * * NSDictionary* values = [NSDictionary dictionaryWithObject: @"newValue" forKey: @"column"]; * BXDatabaseObject* newObject = [ctx createObjectForEntity: entity * withFieldValues: values error: NULL]; * NSLog (@"new object: %@", newObject); * * return 0; * } * \end{lstlisting} * \endlatexonly * \htmlonly * #import <Foundation/Foundation.h> * #import <BaseTen/BaseTen.h> * * int main (int argc, char** argv) * { * NSURL* databaseURI = [NSURL URLWithString: @"pgsql://username@localhost/database"]; * BXDatabaseContext* ctx = [[BXDatabaseContext alloc] initWithDatabaseURI: databaseURI]; * * [ctx connectSync: NULL]; * BXEntityDescription* entity = [[ctx databaseObjectModel] entityForTable: @"table"]; * NSArray* result = [ctx executeFetchForEntity: entity withPredicate: nil error: NULL]; * * for (BXDatabaseObject* object in result) * { * NSLog (@"Object ID: %@ column: %@", * [[object objectID] URIRepresentation], [object valueForKey: @"column"]); * } * * NSDictionary* values = [NSDictionary dictionaryWithObject: @"newValue" forKey: @"column"]; * BXDatabaseObject* newObject = [ctx createObjectForEntity: entity withFieldValues: values error: NULL]; * NSLog (@"new object: %@", newObject); * * return 0; * } * \endhtmlonly * * * \section creating_a_database_context Creating a database context * * The designated initializer of BXDatabaseContext is * \ref BXDatabaseContext::initWithDatabaseURI: "-initWithDatabaseURI:". \ref BXDatabaseContext::init "-init" * is also available but the context does require an URI before connecting. * * BXDatabaseContext requires the URI to be formatted as follows:
Type conversion *
PostgreSQL typeCocoa type
aclitem(A private class)
bigint, bigserialNSNumber
bitNSString
booleanNSNumber
byteaNSData
char, bpcharNSString
dateNSDate
decimal, numericNSDecimalNumber
double precisionNSNumber
int2vectorNSArray of NSNumbers
integer, serialNSNumber
nameNSString
oidNSNumber
pointNSValue
realNSNumber
smallintNSNumber
textNSString
timeNSDate
time with time zoneNSDate
timestampNSDate
timestamp with time zoneNSDate
varbitNSString
varcharNSString
uuidNSString
xmlNSData or NSXMLDocument
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * \section string_handling String types * * When NSStrings are passed to the database, they are normalized to Unicode NFD. In case the database's encoding isn't Unicode (UTF-8), PostgreSQL will handle the * conversion. * * Even if the database's encoding is Unicode, PostgreSQL compares bytes, not Unicode characters, in strings as of version 8.3. * Thus, comparison within the database could fail when done with non-normalized strings or strings in NFC. * * * * * \section date_handling Date and time types * * Cocoa's and Core Foundation's date classes store the date as seconds from a reference date, 2001-01-01 00:00:00 UTC. SQL times and timestamps, on the other hand, might have * an associated time zone specified as an offset to GMT. In PostgreSQL 8.3, removing the time zone information by casting truncates the value. Casting a time or a timestamp * lacking a time zone assigns the current time zone to it instead of converting. * * BaseTen does several things to cope with this: * \li It sets the connection's time zone to UTC. * \li It assigns UTC to times and timestamps that don't have a time zone. * \li It converts received times and timestamps in other time zones to UTC. * \li NSCalendarDates passed as parameters will be converted to UTC. * * Therefore, NSDates received from the server should in fact contain the offset from their point in time to the reference date. To ease handling, the date is set to * 2001-01-01 in case of time types. This allows -[NSDate timeIntervalSinceReferenceDate] to return the time's difference to midnight in seconds. * * NSDates are converted to their date representation using NSCalendar and its underlying ICU library. ICU specifies a single cut-over date for the switch from Julian to * Gregorian calendar, which is 1582-10-04. (It isn't currently possible to specify a different cut-over date to NSCalendar.) NSDates before this point will be converted * to Julian calendar dates. The rationale for this is that timestamps can't be passed directly to PostgreSQL, and NSCalendar seems to be the best option for representing * timestamps as dates. PostgreSQL, on the other hand, uses Julian days (number of days since January 1, 4713 BCE with fraction, length of the year specified as 365.2425 * days) for date calculations, and most likely converts them to Gregorian calendar dates for presentation. Thus, your mileage may vary when calculating dates within * the database. * * \note In versions earlier than 1.7, date handling depended on several factors, such as the current time zone and the server's time zone. This is no longer the case. Also, all * date and time types are currently returned as NSDate, not NSCalendarDate. * * * \section xml_handling The XML type * * PostgreSQL's xml data type handles both XML documents and content fragments. BaseTen creates NSData objects from them by default, but if the * table also has a constraint like CHECK (xml_column IS DOCUMENT), NSXMLDocuments will be created instead. The constraint mustn't * contain any other conditions, but there may be additional CHECK constraints. * * * \section custom_database_types Requirements for custom base data types * * In case of BaseTen-enabled tables, column contents are compared on update to determine, which columns did actually change. * Thus, any custom base data types (created with CREATE TYPE) used in these tables need to have the equality * operator =. Currently, the operator needs to be accessible using the default search path. In case the custom type * is such that the concept of equality doesn't apply, the operator may always return false. In this case * the value for the column will always be fetched when the corresponding row changes. * * BaseTen provides custom equality operators for PostgreSQL's geometric types, * for which the default equality operator would only compare equal areas. */ /** * \page relationships Relationships * * BaseTen supports the same types of relationships as Core Data: one-to-one, one-to-many and many-to-many. * After BaseTen schema has been installed, * relationships are created using foreign keys as shown in the following table. * * * Required conditions for relationsips *
Relationship typeRequired conditions
One-to-manyA foreign key constraint on the many-side.
One-to-oneA foreign key constraint the columns of which also have an unique constraint.
Many-to-manyA helper table that has foreign keys referencing two other tables. The foreign key columns also need to form the table's primary key.
* * * * * * * * * * * * * * * * * * \note Before BaseTen 1.8, relationships were only available in enabled tables and views. * * * \section relationship_naming Relationship naming * * Relationship names are determined from foreign key names. For one-to-one and one-to-many * relationships, the foreign key's name should have the form name1__name2, where name1 is * the relationship's name from the foreign key's side, and name2 is the inverse relationship's * name. If the foreign key's name doesn't contain two consecutive underscores, a generated name is * used for the inverse relationship. (Similarly, if the foreign key's name begins with two * underscores, a generated name is used for the relationship. The generated name has the format * schema_table_foreignkey. * * Many-to-many relationships have the same name as the foreign key that references the target table. * * BaseTen Assistant generates foreign keys with names like this, but if creating or altering the * database schema isn't an option, a set of identical relationships is created with different names. * Each relationship has the same name as the target table, with the word “Set” appended in the case * of to-many relationships. * * The latter naming is also available with views, while the former is not. * * In case the two relationships created into the same entity have matching names, the one named * after the table and its inverse relationship are removed. In case two relationships created into * one entity using different foreign keys have matching names, they will both be removed with their * inverse relationships. * * * Relationship names *
Relationship typeAvailable names
One-to-many (inverse, from the foreign key's side)targetSet, first part of the foreign key's name
One-to-many (from the referenced side)target, second part of the foreign key's name
One-to-one (from the foreign key's side)target, first part of the foreign key's name
One-to-one (from the referenced side)target, second part of the foreign key's name
Many-to-manytargetSet, name of the foreign key that references the target table
* * * * * * * * * * * * * * * * * * * * * * * * * * \note The relationship names used before version 1.7 are still available. They won't be listed * by BaseTen Assistant, though, and using them will call \ref BXDeprecationWarning. * * * \section relationship_naming_example Relationship example * * Consider the following case: * \latexonly * \lstset{language=SQL, backgroundcolor=\color[rgb]{0.84,0.87,0.90}, rulecolor=\color[gray]{0.53}, frame=single, framesep=0pt, framextopmargin=2pt, framexbottommargin=2pt, fontadjust, columns=fullflexible, captionpos=b} * \begin{lstlisting}[caption=Tables with a one-to-many relationship] * CREATE TABLE person ( * id SERIAL PRIMARY KEY, * firstname VARCHAR (255), * surname VARCHAR (255) * ); * * CREATE TABLE email ( * id SERIAL PRIMARY KEY, * address VARCHAR (255), * person_id INTEGER REFERENCES person (id) * ); * \end{lstlisting} * \endlatexonly * \htmlonly * CREATE TABLE person ( * id SERIAL PRIMARY KEY, * firstname VARCHAR (255), * surname VARCHAR (255) * ); * * CREATE TABLE email ( * id SERIAL PRIMARY KEY, * address VARCHAR (255), * person_id INTEGER REFERENCES person (id) * ); * \endhtmlonly * * Lets say we have two objects: aPerson and anEmail which have been fetched from the person and email * tables, respectively.
* [aPerson valueForKey:\@"emailSet"] will now return a collection of email objects.
* [anEmail valueForKey:\@"person"] will return a single person object. * * If we modify the previous example by adding an unique constraint, we get a one-to-one relationship: * * \latexonly * \begin{lstlisting} * ALTER TABLE email ADD UNIQUE (person_id); * \end{lstlisting} * \endlatexonly * \htmlonly * ALTER TABLE email ADD UNIQUE (person_id); * \endhtmlonly * * Now both of the following messages will return a single object from the corresponding table:
* [aPerson valueForKey:\@"email"]
* [anEmail valueForKey:\@"person"] * * Many-to-many relationships are modeled with helper tables. The helper table needs to have columns to contain * both tables' primary keys. * * Another example: * \latexonly * \begin{lstlisting}[caption=Tables with a many-to-many relationship] * CREATE TABLE person ( * id SERIAL PRIMARY KEY, * firstname VARCHAR (255), * surname VARCHAR (255) * ); * * CREATE TABLE title ( * id SERIAL PRIMARY KEY, * name VARCHAR (255) * ); * * CREATE TABLE person_title_rel ( * person_id INTEGER REFERENCES person (id), * title_id INTEGER REFERENCES title (id), * PRIMARY KEY (person_id, title_id) * ); * \end{lstlisting} * \endlatexonly * \htmlonly *CREATE TABLE person ( * id SERIAL PRIMARY KEY, * firstname VARCHAR (255), * surname VARCHAR (255) *); * *CREATE TABLE title ( * id SERIAL PRIMARY KEY, * name VARCHAR (255) *); * *CREATE TABLE person_title_rel ( * person_id INTEGER REFERENCES person (id), * title_id INTEGER REFERENCES title (id), * PRIMARY KEY (person_id, title_id) *); * \endhtmlonly * * Lets say aPerson has been fetched from the person table and aTitle from the title table. * In this case,
* [aPerson valueForKey:\@"titleSet"] will return a collection of title objects and
* [aTitle valueForKey:\@"personSet"] a collection of person objects.
* Any two foreign keys * in one table will be interpreted as a many-to-many relationship, if they also form the table's * primary key. Objects from the helper table may be retrieved as with one-to-many relationships:
* [aPerson valueForKey:\@"person_title_relSet"]. */ /** * \page predicates Predicates * * Cocoa predicates are used to fetch objects that match certain criteria. Key paths in predicates * correspond to entity attributes and relationships. * * Most types of predicates and expressions are converted to SQL and sent to the database server. * Others cause the returned object set to be filtered again on the client side. Specifically, the following * use cases work in this manner: The affected part of the predicate is replaced with true (or false, * if the part is inside an odd number of NOT predicates), and excess objects are removed from the result set * after it has been received. * *
*
• Use of NSCustomSelectorPredicateOperatorType
• *
• A modifier other than NSDirectPredicateModifier in combination with any of the following: *
*
• NSBeginsWithPredicateOperatorType
• *
• NSEndsWithPredicateOperatorType
• *
• NSMatchesPredicateOperatorType
• *
• NSLikePredicateOperatorType
• *
• NSContainsPredicateOperatorType
• *
• NSInPredicateOperatorType
• *
*
• *
• Use of any of the following predicate options: *
*
• NSDiacriticInsensitivePredicateOption
• *
• NSNormalizedPredicateOption
• *
• NSLocaleSensitivePredicateOption
• *
*
• *
• Use of any of the following expression types: *
*
• NSSubqueryExpressionType
• *
• NSUnionSetExpressionType
• *
• NSIntersectSetExpressionType
• *
• NSMinusSetExpressionType
• *
• NSBlockExpressionType
• *
*
• *
• Use of a function expression with a custom target and selector
• *
• Use of a function expression with any of the following predefined selectors: *
*
• average:
• *
• castObject:toType:
• *
• max:
• *
• median:
• *
• min:
• *
• mode:
• *
• random
• *
• random:
• *
• randomn:
• *
• stddev:
• *
*
• *
*
• It can present errors to the user when creating a new object fails.
• *
• It can get a BXEntityDescription from its database context and fetch objects using it. NSEntityDescriptions cannot be used because they are CoreData-specific.
• *
• It can lock the edited row in the database when an editing session begins.
• *
• It can provide the selected objects' ids.
• *
* * BXSynchronizedArrayController shouldn't be set to entity mode; the user interface for this isn't even available * in Interface Builder. It also doesn't make use of a managed object context. * * BXSynchronizedArrayController's Content Set may be bound to another synchronized array controller with * a key path that represents a relationship. In case of a one-to-many relationship, the foreign key field * values will also be set when -newObject or -createObject: gets called. * * * \section using_bxdatabasecontext_ib Using BXDatabaseContext from Interface Builder * *
*
2. *
3. Create a new nib file.
4. *
5. Drag a database context from the library to the file.
6. *
7. Select the database context and choose Attributes from the inspector's pop-up menu.
8. *
9. Enter a valid database URI, pgsql:///database_name at minimum.
10. *
* * * \section using_bxsynchronizedarraycontroller_ib Using BXSynchronizedArrayController from Interface Builder * *
*
1. Drag a BXSynchronizedArrayController from the library to the file.
2. *
3. Select the array controller and choose Attributes from the inspector's pop-up menu.
4. *
5. Enter a table name into the field. *
*
• The schema field may be left empty, in which case public will be used.
• *
*
6. *
7. Bind the Cocoa views to the controller.
8. *
9. Bind the array controller to the database context using the Database Context binding or * connect the databaseContext outlet.
10. *
11. Test the interface. The views should be populated using the database.
12. *
* * * \section using_value_transformers_ib Using BaseTenAppKit's value transformers from Interface Builder * * When database rows get locked, it might be desirable to disable editing and indicate this visually * in the user interface. Most AppKit's classes, have an Editable binding, and some, like NSTableColumn, * have bindings that affect the display of their value. Lets say a table column's Value is * bound to a BXArrayController using my_key as the model key path. BaseTenAppKit could then * be used to set the rows to be conditionally editable like this: *
*
1. Select the table column inside its table view
2. *
3. Open the Bindings Inspector
4. *
5. Click the Editable binding
6. *
7. Set the binding to the array controller and set the controller key to arrangedObjects. *
8. Set the model key to statusInfo.my_key.
9. *
10. Set the value transformer to BXObjectStatusToEditableTransformer.
11. *
* The rows may also be coloured so that their status is visible: *
*
1. Inspecting the same column as in the previous example, click the Text Color binding.
2. *
3. Set the binding to the array controller and set the controller key to arrangedObjects. *
4. Set the model key to statusInfo.my_key.
5. *
6. Set the value transformer to BXObjectStatusToColorTransformer.
7. *
*
1. Right-click your application target in the Groups & Files table
2. *
3. Select Add, New Build Phase and New Copy Files Build Phase
4. *
5. Select Frameworks as the destination
6. *
7. Click the disclosure triangle next to your target
8. *
9. Drag BaseTen and BaseTenAppKit inside the new build phase
10. *
* * The frameworks are built with the -headerpad_max_install_names linker option, so changing the install names with tools like install_name_tool should also be possible. * When building BaseTen and BaseTenAppKit using the Debug configuration, the install name is left empty, which causes it to be set to the build directory. */ /** * \page building_baseten Building BaseTen * * For a successful build, Xcode 3.1 and Mac OS X 10.5 SDK are required. * * BaseTen has several subprojects, namely BaseTenAppKit and a plug-in for Interface Builder 3. The default target in * BaseTen.xcodeproj, BaseTen + GC, builds them as well; the plug-in and the AppKit framework will appear in the * subprojects' build folders, which are set to the default folder. The built files will be either in * build folders in the subprojects' folders or in the user-specified build folder. The documentation will be * in the Documentation folder. * * * \section building_for_the_release_dmg Building for the release disk image * * The files needed to build the release disk image are in the SVN repository as well. Doxygen is needed during * the process. To create the DMG, follow these steps: *
*
1. From the checked-out directory, cd ReleaseDMG.
2. *
3. The default location for the built files is BaseTen-dmg-build in the current directory. To set a custom path, edit the SYMROOT variable in create_release_dmg.sh.
4. *
5. * Do ./create_release_dmg.sh. The built DMG will appear in the ReleaseDMG folder. *
*
• If you don't have LaTeX installed, do ./create_release_dmg.sh -–without-latex instead. The PDF manual won't be included on the DMG, though.
• *
*
6. *
*/ /** * \page database_usage Database administration * * \latexonly \section*{Topics} \endlatexonly * \li \subpage baseten_enabling * \li \subpage database_dumps * \li \subpage postgresql_installation */ /** * \page baseten_enabling Enabling relations for use with BaseTen * * Some tables are created in BaseTen schema to track changes in other relations and storing relationships * between tables and views. The association is based on relation names. * * While this arrangement allows clients to fault only changed objects, it has some unfortunate side effects: * \li Altering relations' names after having them enabled will not work. To rename relations, they need * to be disabled first and re-enabled afterwards. * \li Altering relations' primary keys will not work. Again, disabling and re-enabling is required. * \li Altering relations' columns will not work. Again, disabling and re-enabling is required. * \li Altering relations' foreign keys causes BaseTen's relationship information to become out-of-date * and needing to be refreshed. * * All this can be done using BaseTen Assistant. * * \note In version 1.5, relations and BaseTen's tables were associated with each other based on relation * names. This didn't work for all names, though, and made renaming enabled relations impossible. * In versions 1.6 through 1.6.2, the association was based on relation oids. While this made * renaming relations possible, it also made dumping database contents exceedingly difficult. * * * \section sql_enabling Enabling relations and updating relationship cache using SQL functions * * In addition to using BaseTen Assistant, it is possible to enable and disable tables with SQL functions. * The functions are baseten.enable (oid) and baseten.disable (oid). The object identifier * argument can be looked up from PostgreSQL's system tables, pg_class and pg_namespace. * * Views' primary keys are stored in baseten.view_pkey. The table has three columns: nspname, * relname and attname, which correspond to the view's schema name, the view's name and each primary * key column's name respectively. To enable a view, its primary key needs to be specified first. * * Relationships and view hierarchies among other things are stored in automatically-generated tables. * These should be refreshed with the SQL function baseten.refresh_caches () after all changes to views, * primary keys and foreign keys. */ /** * \page database_dumps Making a database dump * * After having been in use, the BaseTen schema might contain some temporary information. The temporary information is removed periodically when the * database is queried, but for creating installation scripts it might be desirable to remove all unnecessary data. This can be done from BaseTen * Assistant or by running the SQL function baseten.prune (). * * For BaseTen schema to work, the table contents for most tables are needed, so dumps excluding the data are not recommended. */ /** * \page postgresql_installation PostgreSQL installation * * PostgreSQL is distributed as an Installer package at the following address:
* http://www.postgresql.org/download/macosx * Another option is to build the server from source. Here's a brief tutorial. *
*
1. Get the latest PostgreSQL source release (8.2 or later) from http://www.postgresql.org/ftp/source.
2. *
3. Uncompress, configure, make, [sudo] make install. On Mac OS X, Bonjour and OpenSSL are available, so ./configure –-with-bonjour –-with-openssl && make && sudo make install probably gives the expected results.
4. *
5. It's usually a good idea to create a separate user and group for PostgreSQL, but Mac OS X already comes with a database-specific user: for mysql. We'll just use that and hope PostgreSQL doesn't mind.
6. *
7. Make mysql the owner of the PostgreSQL folder, then sudo to mysql:\n * * sudo chown -R mysql:mysql /usr/local/pgsql\n * sudo -u mysql -s * *
8. *
9. Initialize the PostgreSQL database folder. We'll use en_US.UTF-8 as the default locale:\nLC_ALL=en_US.UTF-8 /usr/local/pgsql/bin/initdb -D \\\n /usr/local/pgsql/data
10. *
11. Launch the PostgreSQL server itself:\n * * /usr/local/pgsql/bin/pg_ctl -D /usr/local/pgsql/data \\\n * -l /usr/local/pgsql/data/pg.log start * *
12. Create a superuser account for yourself. This way, you don't have to sudo to mysql to create new databases and users.\n * /usr/local/pgsql/bin/createuser your-short-user-name *
13. *
14. Exit the mysql sudo and create a database. If you create a database with your short user name, psql will connect to it by default.\n * * exit\n * /usr/local/pgsql/bin/createdb your-short-user-name * *
15. *
*/