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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 the
<code class="literal">commit</code> command. To roll back the current transaction,
call the <code class="literal">rollback</code> command. (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">spi_exec</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
command for that.
</p><p>
Here is an example:
</p><pre class="programlisting">
CREATE PROCEDURE transaction_test1()
LANGUAGE pltcl
AS $$
for {set i 0} {$i < 10} {incr i} {
spi_exec "INSERT INTO test1 (a) VALUES ($i)"
if {$i % 2 == 0} {
commit
} else {
rollback
}
}
$$;
CALL transaction_test1();
</pre><p>
</p><p>
Transactions cannot be ended when an explicit subtransaction is active.
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