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# XXIV. dbx Functions

# 简介

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 (PHP 5).

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 `php.ini` 的影响。

表格 1. DBX Configuration Options

Name | Default | Changeable | Changelog
--- | --- | --- | ---
dbx.colnames_case | "unchanged" | PHP_INI_SYSTEM | Available since PHP 4.3.0.

有关 PHP_INI_* 常量进一步的细节与定义参见 附录 H。

以下是该配置选项的简要解释。

dbx.colnames_case string

  Columns names can be returned "unchanged" or converted to "uppercase" or "lowercase". This directive can be overridden with a flag to dbx_query().

# 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

以下常量由本扩展模块定义，因此只有在本扩展模块被编译到 PHP 中，或者在运行时被动态加载后才有效。

`DBX_MYSQL` (integer)

`DBX_ODBC` (integer)

`DBX_PGSQL` (integer)

`DBX_MSSQL` (integer)

`DBX_FBSQL` (integer)

`DBX_OCI8` (integer) (available from PHP 4.3.0)

`DBX_SYBASECT` (integer)

`DBX_SQLITE` (integer) (PHP 5)

`DBX_PERSISTENT` (integer)

`DBX_RESULT_INFO` (integer)

`DBX_RESULT_INDEX` (integer)

`DBX_RESULT_ASSOC` (integer)

`DBX_RESULT_UNBUFFERED` (integer) (PHP 5)

`DBX_COLNAMES_UNCHANGED` (integer) (available from PHP 4.3.0)

`DBX_COLNAMES_UPPERCASE` (integer) (available from PHP 4.3.0)

`DBX_COLNAMES_LOWERCASE` (integer) (available from PHP 4.3.0)

`DBX_CMP_NATIVE` (integer)

`DBX_CMP_TEXT` (integer)

`DBX_CMP_NUMBER` (integer)

`DBX_CMP_ASC` (integer)

`DBX_CMP_DESC` (integer)

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