PHP. Руководство по PHP. 2005

Description

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):

Таблица 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

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

Таблица 2. Valid values for "Read_Only" parameter
Value Constant Meaning
0 SESAM_TXREAD_READWRITE Read/Write
1 SESAM_TXREAD_READONLY Read-Only

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.

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

Отвечу на любые вопросы. С уважением, Дмитрий Владимирович.

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