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# LV. Ingres II Functions

# Introduction

These functions allow you to access Ingres II database servers.

> Huomaa: If you already used PHP extensions to access other database servers, note that Ingres doesn't allow concurrent queries and/or transaction over one connection, thus you won't find any result or transaction handle in this extension. The result of a query must be treated before sending another query, and a transaction must be committed or rolled back before opening another transaction (which is automatically done when sending the first query).

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# Requirements

To compile PHP with Ingres support, you need the Open API library and header files included with Ingres II.

# Installation

In order to have these functions available, you must compile PHP with Ingres support by using the --with-ingres[=DIR] option, where DIR is the Ingres base directory, which defaults to `/II/ingres`. If the II_SYSTEM environment variable isn't correctly set you may have to use --with-ingres=DIR to specify your Ingres installation directory.

When using this extension with Apache, if Apache does not start and complains with "PHP Fatal error: Unable to start ingres_ii module in Unknown on line 0" then make sure the environment variable II_SYSTEM is correctly set. Adding "export II_SYSTEM="/home/ingres/II" in the script that starts Apache, just before launching httpd, should be fine.

# Runtime Configuration

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

Taulu 1. Ingres II configuration options

Name | Default | Changeable | Changelog
--- | --- | --- | ---
ingres.allow_persistent | "1" | PHP_INI_SYSTEM | Available since PHP 4.0.2.
ingres.max_persistent | "-1" | PHP_INI_SYSTEM | Available since PHP 4.0.2.
ingres.max_links | "-1" | PHP_INI_SYSTEM | Available since PHP 4.0.2.
ingres.default_database | NULL | PHP_INI_ALL | Available since PHP 4.0.2.
ingres.default_user | NULL | PHP_INI_ALL | Available since PHP 4.0.2.
ingres.default_password | NULL | PHP_INI_ALL | Available since PHP 4.0.2.

For further details and definitions of the PHP_INI_* constants, see the Liite H.

# Resource Types

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# Predefined Constants

The constants below are defined by this extension, and will only be available when the extension has either been compiled into PHP or dynamically loaded at runtime.

`INGRES_ASSOC` (integer)

`INGRES_NUM` (integer)

`INGRES_BOTH` (integer)

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zend_version | Ylös | ingres_autocommit