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Дата индексирования: Mon Oct 1 22:19:09 2012
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sesam_settransaction
PHP Manual
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sesam_settransaction

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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):

Table 1. Valid values for "Isolation_Level" parameter

ValueConstantMeaning
1SESAM_TXISOL_READ_UNCOMMITTEDRead Uncommitted
2SESAM_TXISOL_READ_COMMITTEDRead Committed
3SESAM_TXISOL_REPEATABLE_READRepeatable Read
4SESAM_TXISOL_SERIALIZABLESerializable

Table 2. Valid values for "Read_Only" parameter

ValueConstantMeaning
0SESAM_TXREAD_READWRITERead/Write
1SESAM_TXREAD_READONLYRead-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);
?>

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