介绍

The dbx module is a database abstraction layer (db 'X', where 'X' is a supported database). The dbx functions allow you to access all supported databases using a single calling convention. The dbx-functions themselves do not interface directly to the databases, but interface to the modules that are used to support these databases.

需求

To be able to use a database with the dbx-module, the module must be either linked or loaded into PHP, and the database module must be supported by the dbx-module. Currently, the following databases are supported, but others will follow:

• FrontBase (available from PHP 4.1.0).

• Microsoft SQL Server

• MySQL

• ODBC

• PostgreSQL

• Sybase-CT (available from PHP 4.2.0).

• Oracle (oci8) (available from PHP 4.3.0).

• SQLite (CVS only).

Documentation for adding additional database support to dbx can be found at http://www.guidance.nl/php/dbx/doc/.

安装

In order to have these functions available, you must compile PHP with dbx support by using the --enable-dbx option and all options for the databases that will be used, e.g. for MySQL you must also specify --with-mysql=[DIR]. To get other supported databases to work with the dbx-module refer to their specific documentation.

运行时配置

这些函数的行为受到全局配置文件 php.ini 的影响。

以下是该配置选项的简要解释。

资源类型

There are two resource types used in the dbx module. The first one is the link-object for a database connection, the second a result-object which holds the result of a query.

预定义常量

由于这些常量是由该扩展模块定义的，因此只有在该扩展模块被编译到 PHP 中，或者在运行时被动态加载后，这些常量才有效。