sesam_settransaction

(No version information available, might be only in CVS)

sesam_settransaction — Set SESAM transaction parameters

Description

bool sesam_settransaction ( int $isolation_level , int $read_only )

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

sesam_settransaction() 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.

sesam_settransaction() can only be called before starting a transaction, not after the transaction has been started already.

To simplify the use in php scripts, the following constants have been predefined in php (see SESAM handbook for detailed explanation of the semantics):

**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

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

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

Example#1 Setting SESAM transaction parameters


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