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<h1>22. Virtuoso Functions Guide - sql_transact</h1>
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<div id="text">
<h2>sql_transact</h2>
<div class="refpurpose">get list of available DSNs</div>
<div class="funcsynopsis">
<span class="funcdef">
<span class="function">sql_transact</span>
</span>
(<span class="paramdef">in <span class="parameter">dsn_name</span> varchar</span>,
<span class="paramdefoptional">[in <span class="optional">rollback</span> integer]</span>);
</div>
<div class="refsect1">
<div class="refsect1title">Description</div>
<p>This procedure can be used to control the commit/rollback behavior
of a particular remote data source during a Virtuoso transaction such as in
a stored procedure.</p>
<p>Under normal circumstances Virtuoso will correctly commit or
rollback all associated work as expected, however it may be desirable
intervene. When issued without the second parameter a commit will be
forced upon the current transactions of the dsn_name above
the call to <span class="computeroutput">sql_transact</span> regardless
of overall outcome. When rollback = 1 is set then a rollback will be forced
likewise, hence this will not rollback work on the remote dsn_name prior
to <span class="computeroutput">sql_transact</span>.</p>
</div>
<div class="refsect1">
<div class="refsect1title">Parameters</div>
<div class="refsect2">
<span class="refsect2title">dsn_name – </span>
The name of the data source being used on the remote.</div>
<div class="refsect2">
<span class="refsect2title">rollback – </span>
Activate the desired behavior. Set to 1 for rollback, ignore to commit.</div>
</div>
<div class="refsect1">
<div class="refsect1title">Return Types</div>
<p>None.</p>
</div>
<div class="refsect1">
<div class="refsect1title">Examples</div>
<a name="ex_sql_transact" />
<div class="example">
<div class="exampletitle">Control remote rollback/commit behavior</div>
<p>This code fragment can be used to demonstrate the effects of directly
controlling the rollback/commit behavior of remote data sources connected
to Virtuoso.</p>
<div>
<pre class="programlisting">
create procedure TEST_ROLLBACK ()
{
commit work;
insert into mydsn..rb_test values (1);
sql_transact('mydsn');
insert into mydsn..rb_test values (2);
rollback work;
};
create procedure TEST_ROLLBACK ()
{
commit work;
insert into mydsn..rb_test values (1);
sql_transact('mydsn', 1);
insert into mydsn..rb_test values (2);
commit work;
};
delete from mydsn..rb_test;
commit work;
TEST_COMMIT();
select MIN (ID) from mydsn..rb_test;
-- returns 1
delete from mydsn..rb_test;
commit work;
TEST_ROLLBACK();
select MIN (ID) from mydsn..rb_test;
-- returns 2
</pre>
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<div class="refsect1title">See Also</div>
<p>
<a href="fn_sql_columns.html">sql_columns</a>
<a href="fn_sql_primary_keys.html">sql_primary_keys</a>,
<a href="fn_sql_gettypeinfo.html">sql_gettypeinfo</a>,
<a href="fn_sql_statistics.html">sql_statistics</a>,
<a href="fn_sql_tables.html">sql_tables</a>.</p>
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