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In a procedure called from the top level or an anonymous code block
(<code class="command">DO</code> command) called from the top level it is possible to
control transactions. To commit the current transaction, call
<code class="literal">plpy.commit()</code>. To roll back the current transaction,
call <code class="literal">plpy.rollback()</code>. (Note that it is not possible to
run the SQL commands <code class="command">COMMIT</code> or
<code class="command">ROLLBACK</code> via <code class="function">plpy.execute</code> or
similar. It has to be done using these functions.) After a transaction is
ended, a new transaction is automatically started, so there is no separate
function for that.
</p><p>
Here is an example:
</p><pre class="programlisting">
CREATE PROCEDURE transaction_test1()
LANGUAGE plpythonu
AS $$
for i in range(0, 10):
plpy.execute("INSERT INTO test1 (a) VALUES (%d)" % i)
if i % 2 == 0:
plpy.commit()
else:
plpy.rollback()
$$;
CALL transaction_test1();
</pre><p>
</p><p>
Transactions cannot be ended when an explicit subtransaction is active.
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