sesam_settransaction
(PHP 3 CVS only)
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
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
Table 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.
Example 1. Setting SESAM transaction parameters
<?php
sesam_settransaction (SESAM_TXISOL_REPEATABLE_READ,
SESAM_TXREAD_READONLY);
?>
