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<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.4 $ -->
<!-- splitted from ./en/functions/sesam.xml, last change in rev 1.1 -->
<refentry id="function.sesam-settransaction">
<refnamediv>
<refname>sesam_settransaction</refname>
<refpurpose>Set SESAM transaction parameters</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<methodsynopsis>
<type>bool</type><methodname>sesam_settransaction</methodname>
<methodparam><type>int</type><parameter>isolation_level</parameter></methodparam>
<methodparam><type>int</type><parameter>read_only</parameter></methodparam>
</methodsynopsis>
<para>
Returns: &true; if the values are valid, and the
<function>settransaction</function> operation was successful,
&false; otherwise.
</para>
<para>
<function>sesam_settransaction</function> 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.
</para>
<para>
<function>sesam_settransaction</function> can only be called
before starting a transaction, not after the transaction has been
started already.
</para>
<para>
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>
<title>
Valid values for <parameter>"Isolation_Level"</parameter>
parameter
</title>
<tgroup cols="3">
<thead>
<row>
<entry>Value</entry>
<entry>Constant</entry>
<entry>Meaning</entry>
</row>
</thead>
<tbody>
<row>
<entry>1</entry>
<entry><literal>SESAM_TXISOL_READ_UNCOMMITTED</literal></entry>
<entry>Read Uncommitted</entry>
</row>
<row>
<entry>2</entry>
<entry><literal>SESAM_TXISOL_READ_COMMITTED</literal></entry>
<entry>Read Committed</entry>
</row>
<row>
<entry>3</entry>
<entry><literal>SESAM_TXISOL_REPEATABLE_READ</literal></entry>
<entry>Repeatable Read</entry>
</row>
<row>
<entry>4</entry>
<entry><literal>SESAM_TXISOL_SERIALIZABLE</literal></entry>
<entry>Serializable</entry>
</row>
</tbody>
</tgroup>
</table>
<table>
<title>
Valid values for <parameter>"Read_Only"</parameter> parameter
</title>
<tgroup cols="3">
<thead>
<row>
<entry>Value</entry>
<entry>Constant</entry>
<entry>Meaning</entry>
</row>
</thead>
<tbody>
<row>
<entry>0</entry>
<entry><literal>SESAM_TXREAD_READWRITE</literal></entry>
<entry>Read/Write</entry>
</row>
<row>
<entry>1</entry>
<entry><literal>SESAM_TXREAD_READONLY</literal></entry>
<entry>Read-Only</entry>
</row>
</tbody>
</tgroup>
</table>
</para>
<para>
The values set by <function>sesam_settransaction</function> will
override the default setting specified in the <link
linkend="ini.sesam-configfile">SESAM configuration file</link>.
</para>
<para>
<example>
<title>Setting SESAM transaction parameters</title>
<programlisting role="php">
<![CDATA[
<?php
sesam_settransaction (SESAM_TXISOL_REPEATABLE_READ,
SESAM_TXREAD_READONLY);
?>
]]>
</programlisting>
</example>
</para>
</refsect1>
</refentry>
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