PHP Manual
后退 |  | 前进

# XLVII. IBM DB2, Cloudscape and Apache Derby Functions

# 简介

These functions enable you to access IBM DB2 Universal Database, IBM Cloudscape, and Apache Derby databases using the DB2 Call Level Interface (DB2 CLI).

# 需求

To connect to IBM DB2 Universal Database for Linux, UNIX, and Windows, or IBM Cloudscape, or Apache Derby, you must install an IBM DB2 Universal Database client on the same computer on which you are running PHP. The extension has been developed and tested with DB2 Version 8.2.

To connect to IBM DB2 Universal Database for z/OS or iSeries, you also require IBM DB2 Connect or the equivalent DRDA gateway software.

On Linux or Unix operating systems, ensure that the user invoking the PHP executable or SAPI has sourced the DB2 instance environment before accessing these functions. If you created a DB2 instance in `/home/db2inst1/`, for example, you must issue the following command to modify your environment variables to enable access to DB2:

    bash$ source /home/db2inst1/sqllib/db2profile

To enable your PHP-enabled Web server to access these functions, you must add the same command to your Web server start script (typically `/etc/init.d/httpd` or `/etc/init.d/apache`).

# 安装

To build the ibm_db2 extension, the DB2 application development header files and libraries must be installed on your system. DB2 does not install these by default, so you may have to return to your DB2 installer and add this option.

If you add the DB2 application development header files and libraries to a Linux or Unix operating system on which DB2 was already installed, you must issue the command db2iupdt -e to update the symbolic links to the header files and libraries in your DB2 instances.

ibm_db2 is a PECL extension, so follow the instructions in µÚ 7 章 to install the ibm_db2 extension for PHP. Issue the configure command to point to the location of your DB2 header files and libraries as follows:

    bash$ ./configure --with-IBM_DB2=/path/to/DB2

The configure command defaults to `/opt/IBM/db2/V8.1`.

# 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。

`DB2_BINARY` (integer)

`DB2_CONVERT` (integer)

`DB2_PASSTHRU` (integer)

`DB2_SCROLLABLE` (integer)

  Specifies a scrollable cursor for a statement resource. This mode enables random access to rows in a result set, but currently is supported only by IBM DB2 Universal Database.

`DB2_FORWARD_ONLY` (integer)

  Specifies a forward-only cursor for a statement resource. This is the default cursor type and is supported on all database servers.

`DB2_PARAM_IN` (integer)

  Specifies the PHP variable should be bound as an IN parameter for a stored procedure.

`DB2_PARAM_OUT` (integer)

  Specifies the PHP variable should be bound as an OUT parameter for a stored procedure.

`DB2_PARAM_INOUT` (integer)

  Specifies the PHP variable should be bound as an INOUT parameter for a stored procedure.

`DB2_PARAM_FILE` (integer)

  Specifies that the column should be bound directly to a file for input or output.

`DB2_AUTOCOMMIT_ON` (integer)

  Specifies that autocommit should be turned on.

`DB2_AUTOCOMMIT_OFF` (integer)

  Specifies that autocommit should be turned off.

`DB2_DOUBLE` (integer)

  Specifies that the variable should be bound as a DOUBLE, FLOAT, or REAL data type.

`DB2_LONG` (integer)

  Specifies that the variable should be bound as a SMALLINT, INTEGER, or BIGINT data type.

`DB2_CHAR` (integer)

  Specifies that the variable should be bound as a CHAR or VARCHAR data type.

# 资源类型

The ibm_db2 extension returns connection resources, statement resources, and result set resources.

后退 | 起点 | 前进
ibase_wait_event | 上一级 | db2_autocommit