Rechercher une fonction PHP

ODBC and DB2 Functions (PDO_ODBC)

Contents

Introduction

PDO_ODBC is a driver that implements the PHP Data Objects (PDO) interface to enable access from PHP to databases through ODBC drivers or through the IBM DB2 Call Level Interface (DB2 CLI) library. PDO_ODBC currently supports three different "flavours" of database drivers:

ibm-db2

Supports access to IBM DB2 Universal Database, Cloudscape, and Apache Derby servers through the free DB2 express-C client.

unixODBC

Supports access to database servers through the unixODBC driver manager and the database's own ODBC drivers.

generic

Offers a compile option for ODBC driver managers that are not explicitly supported by PDO_ODBC.

On Windows, php_pdo_odbc.dll has to be enabled as extension in php.ini. It is linked against the Windows ODBC Driver Manager so that PHP can connect to any database cataloged as a System DSN, and is the recommended driver for connecting to Microsoft SQL Server databases.

PHP: ODBC and DB2 (PDO) - Manual Home of Manuel PHP  Contents Haut

Installation

PDO_ODBC on UNIX systems

  1. As of PHP 5.1, PDO_ODBC is included in the PHP source. You can compile the PDO_ODBC extension as either a static or shared module using the following configure commands.

    ibm_db2

    ./configure --with-pdo-odbc=ibm-db2,/opt/IBM/db2/V8.1/
    To build PDO_ODBC with the ibm-db2 flavour, you have to have previously installed the DB2 application development headers on the same machine on which you are compiling PDO_ODBC. The DB2 application development headers are an installable option in the DB2 servers, and are also available as part of the DB2 Application Development Client freely available for download from the IBM developerWorks » website.

    If you do not supply a location for the DB2 libraries and headers to the configure command, PDO_ODBC defaults to /home/db2inst1/sqllib.

    unixODBC

    ./configure --with-pdo-odbc=unixODBC,/usr/local
    If you do not supply a location for the unixODBC libraries and headers to the configure command, PDO_ODBC defaults to /usr/local.

    generic
    ./configure --with-pdo-odbc=generic,/usr/local,libname,ldflags,cflags

PHP: ODBC and DB2 (PDO) - Manual Home of Manuel PHP  Contents Haut

Runtime Configuration

The behaviour of these functions is affected by settings in php.ini.

PDO_ODBC Configuration Options
Name Default Changeable Changelog
pdo_odbc.connection_pooling "strict" PHP_INI_ALL Available since PHP 5.1.0.
pdo_odbc.db2_instance_name NULL PHP_INI_SYSTEM Available since PHP 5.1.1. This deprecated feature will certainly be removed in the future.
For further details and definitions of the PHP_INI_* modes, see the Where a configuration setting may be set.

Here's a short explanation of the configuration directives.

pdo_odbc.connection_pooling string

Whether to pool ODBC connections. Can be one of "strict", "relaxed" or "off" (equals to ""). The parameter describes how strict the connection manager should be when matching connection parameters to existing pooled connections. strict is the recommend default, and will result in the use of cached connections only when all the connection parameters match exactly. relaxed will result in the use of cached connections when similar connection parameters are used. This can result in increased use of the cache, at the risk of bleeding connection information between (for example) virtual hosts.

This setting can only be changed from the php.ini file, and affects the entire process; any other modules loaded into the process that use the same ODBC libraries will be affected too, including the Unified ODBC extension.

Warning

relaxed matching should not be used on a shared server, for security reasons.

Tip

Leave this setting at the default strict setting unless you have good reason to change it.

pdo_odbc.db2_instance_name string

If you compile PDO_ODBC using the db2 flavour, this setting sets the value of the DB2INSTANCE environment variable on Linux and UNIX operating systems to the specified name of the DB2 instance. This enables PDO_ODBC to resolve the location of the DB2 libraries and make cataloged connections to DB2 databases.

This setting can only be changed from the php.ini file, and affects the entire process; any other modules loaded into the process that use the same ODBC libraries will be affected too, including the Unified ODBC extension.

This setting has no effect on Windows.

PHP: ODBC and DB2 (PDO) - Manual Home of Manuel PHP  Contents Haut

Table of Contents

Find a PHP function

English translation

You have asked to visit this site in English. For now, only the interface is translated, but not all the content yet.

If you want to help me in translations, your contribution is welcome. All you need to do is register on the site, and send me a message asking me to add you to the group of translators, which will give you the opportunity to translate the pages you want. A link at the bottom of each translated page indicates that you are the translator, and has a link to your profile.

Thank you in advance.

Document created the 30/01/2003, last modified the 26/10/2018
Source of the printed document:https://www.gaudry.be/en/php-rf-ref.pdo-odbc.html

The infobrol is a personal site whose content is my sole responsibility. The text is available under CreativeCommons license (BY-NC-SA). More info on the terms of use and the author.

References

  1. View the html document Language of the document:fr Manuel PHP : http://php.net

These references and links indicate documents consulted during the writing of this page, or which may provide additional information, but the authors of these sources can not be held responsible for the content of this page.
The author This site is solely responsible for the way in which the various concepts, and the freedoms that are taken with the reference works, are presented here. Remember that you must cross multiple source information to reduce the risk of errors.

Contents Haut