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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:

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

NameDefaultChangeableChangelog
dbx.colnames_case"unchanged"PHP_INI_SYSTEMAvailable 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)

目录
dbx_close -- Close an open connection/database
dbx_compare -- Compare two rows for sorting purposes
dbx_connect -- Open a connection/database
dbx_error --  Report the error message of the latest function call in the module (not just in the connection)
dbx_escape_string --  Escape a string so it can safely be used in an sql-statement
dbx_fetch_row -- Fetches rows from a query-result that had the DBX_RESULT_UNBUFFERED flag set
dbx_query -- Send a query and fetch all results (if any)
dbx_sort --  Sort a result from a dbx_query by a custom sort function