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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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