1. NaviServer
  2. NaviServer Project
  3. nsdbpg

Overview

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What is this?
------------

This module implements a simple NaviServer/AOLserver database services
driver.  A database driver is a module which interfaces between the
NaviServer database-independent nsdb module and the API of a particular
DBMS.  A database driver's job is to open connections, send SQL
statements, and translate the results into the form used by nsdb.  In
this case, the driver is for the PostgreSQL ORDBMS from The PostgreSQL
Global Development Group.  This is the official driver for the OpenACS
project. PostgreSQL can be downloaded and installed on most Unix
systems.  To use this driver, you must have PostgreSQL installed on
your system.  For more information on PostgreSQL or to download the
code, open:

        http://www.postgresql.org

What's new?
-----------

See Changelog.

How does it work?
----------------

Driver modules look much like ordinary AOLserver modules but are
loaded differently.  Instead of being listed with other modules in the
[ns\server\<server-name>\modules] configuration section, a database
driver is listed in the [ns\db\drivers] section and nsdb does
the loading.  The database driver initialization function normally does
little more than call the nsdb Ns_DbRegisterDriver() function with an
array of pointers to functions.  The functions are then later used by
nsdb to open database connections and send and process queries.  This
architecture is much like ODBC on Windows.  In addition to open,
select, and getrow functions, the driver also provides system catalog
functions and a function for initializing a virtual server.  The
virtual server initialization function is called each time nsdb is
loaded into a virtual server.  In this case, the server initialization
function, Ns_PgServerInit, adds the "ns_pg" Tcl command to the server's
Tcl interpreters which can be used to fetch information about an active
PostgreSQL connection in a Tcl script.

Contributors to this file include:

	Don Baccus		<dhogaza@pacifier.com>
	Lamar Owen		<lamar.owen@wgcr.org>
	Jan Wieck		<wieck@debis.com>
	Keith Pasket		(SDL/USU)
	Scott Cannon, Jr.	(SDL/USU)
        Dan Wickstrom           <danw@rtp.ericsson.se>
	Scott S. Goodwin	<scott@scottg.net>
        Gustaf Neumann          <neumann@wu-wien.ac.at>

Original example driver by Jim Davidson


DEVELOPER'S GUIDE:

Run 'make help' for developer information.

The build step needs from PostgreSQL 
 - the include file libpq-fe.h
 - the library libpq.*

Examples for a build operation:

    export PG=/usr/local/pg945
    make PGLIB=$PG/lib PGINCLUDE=$PG/include

Under MacPorts, you might use something like:
    make PGLIB=/opt/local/lib/postgresql95/ PGINCLUDE=/opt/local/include/postgresql95/

For extended code checking via cppchek, one might use e.g.
    make PGLIB=/opt/local/lib/postgresql95/ PGINCLUDE=/opt/local/include/postgresql95/ cppcheck

See the Makefile for further information on building this module.