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1<?xml version="1.0" encoding="UTF-8" standalone="no"?>2<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>44.10. Transaction Management</title><link rel="stylesheet" type="text/css" href="stylesheet.css" /><link rev="made" href="pgsql-docs@lists.postgresql.org" /><meta name="generator" content="DocBook XSL Stylesheets Vsnapshot" /><link rel="prev" href="pltcl-subtransactions.html" title="44.9. Explicit Subtransactions in PL/Tcl" /><link rel="next" href="pltcl-config.html" title="44.11. PL/Tcl Configuration" /></head><body id="docContent" class="container-fluid col-10"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">44.10. Transaction Management</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="pltcl-subtransactions.html" title="44.9. Explicit Subtransactions in PL/Tcl">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="pltcl.html" title="Chapter 44. PL/Tcl — Tcl Procedural Language">Up</a></td><th width="60%" align="center">Chapter 44. PL/Tcl — Tcl Procedural Language</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 16.3 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="pltcl-config.html" title="44.11. PL/Tcl Configuration">Next</a></td></tr></table><hr /></div><div class="sect1" id="PLTCL-TRANSACTIONS"><div class="titlepage"><div><div><h2 class="title" style="clear: both">44.10. Transaction Management <a href="#PLTCL-TRANSACTIONS" class="id_link">#</a></h2></div></div></div><p>3     In a procedure called from the top level or an anonymous code block4     (<code class="command">DO</code> command) called from the top level it is possible5     to control transactions.  To commit the current transaction, call the6     <code class="literal">commit</code> command.  To roll back the current transaction,7     call the <code class="literal">rollback</code> command.  (Note that it is not8     possible to run the SQL commands <code class="command">COMMIT</code> or9     <code class="command">ROLLBACK</code> via <code class="function">spi_exec</code> or similar.10     It has to be done using these functions.)  After a transaction is ended,11     a new transaction is automatically started, so there is no separate12     command for that.13    </p><p>14     Here is an example:15</p><pre class="programlisting">16CREATE PROCEDURE transaction_test1()17LANGUAGE pltcl18AS $$19for {set i 0} {$i &lt; 10} {incr i} {20    spi_exec "INSERT INTO test1 (a) VALUES ($i)"21    if {$i % 2 == 0} {22        commit23    } else {24        rollback25    }26}27$$;28 29CALL transaction_test1();30</pre><p>31    </p><p>32     Transactions cannot be ended when an explicit subtransaction is active.33    </p></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="pltcl-subtransactions.html" title="44.9. Explicit Subtransactions in PL/Tcl">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="pltcl.html" title="Chapter 44. PL/Tcl — Tcl Procedural Language">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="pltcl-config.html" title="44.11. PL/Tcl Configuration">Next</a></td></tr><tr><td width="40%" align="left" valign="top">44.9. Explicit Subtransactions in PL/Tcl </td><td width="20%" align="center"><a accesskey="h" href="index.html" title="PostgreSQL 16.3 Documentation">Home</a></td><td width="40%" align="right" valign="top"> 44.11. PL/Tcl Configuration</td></tr></table></div></body></html>