PHP5中文手册·Set SESAM transaction parameters -- 追寻梦想＞编程乐园＞PHP 编程

说明

bool sesam_settransaction ( int $isolation_level , int $read_only )

Overrides the default values for the isolation level and read-only transaction parameters (which are set in the SESAM configuration file), in order to optimize subsequent queries and guarantee database consistency. The overridden values are used for the next transaction only. See the SESAM handbook for detailed explanation of the semantics.

This function can only be called before starting a transaction, not after the transaction has been started already.

The values set by sesam_settransaction() will override the default setting specified in the SESAM configuration file.

参数

isolation_level

**Valid values for *`isolation_level`* parameter**
Value	Constant	Meaning
1	SESAM_TXISOL_READ_UNCOMMITTED	Read Uncommitted
2	SESAM_TXISOL_READ_COMMITTED	Read Committed
3	SESAM_TXISOL_REPEATABLE_READ	Repeatable Read
4	SESAM_TXISOL_SERIALIZABLE	Serializable

read_only

**Valid values for *`read_only`* parameter**
Value	Constant	Meaning
0	SESAM_TXREAD_READWRITE	Read/Write
1	SESAM_TXREAD_READONLY	Read-Only

返回值

Returns TRUE if the values are valid, and the settransaction operation was successful, FALSE otherwise.

范例

Example#1 Setting SESAM transaction parameters


<?php
sesam_settransaction (SESAM_TXISOL_REPEATABLE_READ,
                     SESAM_TXREAD_READONLY);
?>