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);
?>
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