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.
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/.
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.
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().
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.
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。