In addition to normal ODBC support, the Unified ODBC functions in PHP allow you to access several databases that have borrowed the semantics of the ODBC API to implement their own API. Instead of maintaining multiple database drivers that were all nearly identical, these drivers have been unified into a single set of ODBC functions.
注: There is no ODBC involved when connecting to the above databases. The functions that you use to speak natively to them just happen to share the same names and syntax as the ODBC functions. The exception to this is iODBC. Building PHP with iODBC support enables you to use any ODBC-compliant drivers with your PHP applications. iODBC is maintained by OpenLink Software. More information on iODBC, as well as a HOWTO, is available at www.iodbc.org.
To access any of the supported databases you need to have the required libraries installed.
Include Adabas D support. DIR is the Adabas base install directory, defaults to /usr/local.
Include SAP DB support. DIR is SAP DB base install directory, defaults to /usr/local.
Include Solid support. DIR is the Solid base install directory, defaults to /usr/local/solid.
Include IBM DB2 support. DIR is the DB2 base install directory, defaults to /home/db2inst1/sqllib.
Include Empress support. DIR is the Empress base install directory, defaults to $EMPRESSPATH. From PHP 4, this option only supports Empress Version 8.60 and above.
Include Empress Local Access support. DIR is the Empress base install directory, defaults to $EMPRESSPATH. From PHP 4, this option only supports Empress Version 8.60 and above.
Include Birdstep support. DIR is the Birdstep base install directory, defaults to /usr/local/birdstep.
Include a user defined ODBC support. The DIR is ODBC install base directory, which defaults to /usr/local. Make sure to define CUSTOM_ODBC_LIBS and have some odbc.h in your include dirs. E.g., you should define following for Sybase SQL Anywhere 5.5.00 on QNX, prior to run configure script: CPPFLAGS="-DODBC_QNX -DSQLANY_BUG" LDFLAGS=-lunix CUSTOM_ODBC_LIBS="-ldblib -lodbc".
Include iODBC support. DIR is the iODBC base install directory, defaults to /usr/local.
Include Easysoft OOB support. DIR is the OOB base install directory, defaults to /usr/local/easysoft/oob/client.
Include unixODBC support. DIR is the unixODBC base install directory, defaults to /usr/local.
Include OpenLink ODBC support. DIR is the OpenLink base install directory, defaults to /usr/local. This is the same as iODBC.
Include DBMaker support. DIR is the DBMaker base install directory, defaults to where the latest version of DBMaker is installed (such as /home/dbmaker/3.6).
To disable unified ODBC support in PHP 3 add --disable-unified-odbc to your configure line. Only applicable if iODBC, Adabas, Solid, Velocis or a custom ODBC interface is enabled.
PHP 的 Windows 版本已经内置该扩展模块的支持。无需加载任何附加扩展库即可使用这些函数。
这些函数的行为受 php.ini 的影响。
表格 1. Unified ODBC Configuration Options
注: Entries marked with * are not implemented yet.
Whether to allow persistent ODBC connections.
Check that a connection is still valid before reuse.
The maximum number of persistent ODBC connections per process.
The maximum number of ODBC connections per process, including persistent connections.
Handling of LONG fields. Specifies the number of bytes returned to variables.
Handling of binary data.
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。