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# LV. Ingres II Functions

# 介紹

These functions allow you to access Ingres II database servers.

> 注: 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).

警告
這個延伸是實驗性質的。這個延伸的行為 -- 包括函數名稱和包含此延伸的任何其它文件 -- 在未來PHP的發行中可能會在不通知的情況改變。使用此延伸需自行承擔風險。

# 需求

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

# 安裝

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.

# 執行時期組態

`php.ini`中的設定會影響這些函數的行為。

表格 1. Ingres II configuration options

Name | Default | Changeable
--- | --- | ---
ingres.allow_persistent | "1" | PHP_INI_SYSTEM
ingres.max_persistent | "-1" | PHP_INI_SYSTEM
ingres.max_links | "-1" | PHP_INI_SYSTEM
ingres.default_database | NULL | PHP_INI_ALL
ingres.default_user | NULL | PHP_INI_ALL
ingres.default_password | NULL | PHP_INI_ALL

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

# 資源類型

這個延伸沒有定義任何資源。

# 預先定義常數

以下的常數由此延伸定義，只在這個延伸被編譯成PHP或實行時期被動態載入時有效。

`INGRES_ASSOC` (integer)

`INGRES_NUM` (integer)

`INGRES_BOTH` (integer)

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