sesam_settransaction

Podręcznik PHP
Poprzedni		Następny

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):

Tabela 1. 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

Tabela 2. 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.

Przykład 1. Setting SESAM transaction parameters
<?php sesam_settransaction (SESAM_TXISOL_REPEATABLE_READ, SESAM_TXREAD_READONLY); ?>

Poprzedni	Spis treści	Następny
sesam_seek_row	Początek rozdziału	Sesje