<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >UNLISTEN</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.79"><LINK REV="MADE" HREF="mailto:pgsql-docs@postgresql.org"><LINK REL="HOME" TITLE="PostgreSQL 8.0.11 Documentation" HREF="index.html"><LINK REL="UP" TITLE="SQL Commands" HREF="sql-commands.html"><LINK REL="PREVIOUS" TITLE="TRUNCATE" HREF="sql-truncate.html"><LINK REL="NEXT" TITLE="UPDATE" HREF="sql-update.html"><LINK REL="STYLESHEET" TYPE="text/css" HREF="stylesheet.css"><META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=ISO-8859-1"><META NAME="creation" CONTENT="2007-02-02T03:57:22"></HEAD ><BODY CLASS="REFENTRY" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="5" ALIGN="center" VALIGN="bottom" >PostgreSQL 8.0.11 Documentation</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="top" ><A HREF="sql-truncate.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="10%" ALIGN="left" VALIGN="top" ><A HREF="sql-truncate.html" >Fast Backward</A ></TD ><TD WIDTH="60%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="top" ><A HREF="sql-update.html" >Fast Forward</A ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="top" ><A HREF="sql-update.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="SQL-UNLISTEN" ></A >UNLISTEN</H1 ><DIV CLASS="REFNAMEDIV" ><A NAME="AEN45798" ></A ><H2 >Name</H2 >UNLISTEN -- stop listening for a notification</DIV ><A NAME="AEN45801" ></A ><DIV CLASS="REFSYNOPSISDIV" ><A NAME="AEN45803" ></A ><H2 >Synopsis</H2 ><PRE CLASS="SYNOPSIS" >UNLISTEN { <TT CLASS="REPLACEABLE" ><I >name</I ></TT > | * }</PRE ></DIV ><DIV CLASS="REFSECT1" ><A NAME="AEN45806" ></A ><H2 >Description</H2 ><P > <TT CLASS="COMMAND" >UNLISTEN</TT > is used to remove an existing registration for <TT CLASS="COMMAND" >NOTIFY</TT > events. <TT CLASS="COMMAND" >UNLISTEN</TT > cancels any existing registration of the current <SPAN CLASS="PRODUCTNAME" >PostgreSQL</SPAN > session as a listener on the notification <TT CLASS="REPLACEABLE" ><I >name</I ></TT >. The special wildcard <TT CLASS="LITERAL" >*</TT > cancels all listener registrations for the current session. </P ><P > <A HREF="sql-notify.html" ><I >NOTIFY</I ></A > contains a more extensive discussion of the use of <TT CLASS="COMMAND" >LISTEN</TT > and <TT CLASS="COMMAND" >NOTIFY</TT >. </P ></DIV ><DIV CLASS="REFSECT1" ><A NAME="AEN45819" ></A ><H2 >Parameters</H2 ><P ></P ><DIV CLASS="VARIABLELIST" ><DL ><DT ><TT CLASS="REPLACEABLE" ><I >name</I ></TT ></DT ><DD ><P > Name of a notification (any identifier). </P ></DD ><DT ><TT CLASS="LITERAL" >*</TT ></DT ><DD ><P > All current listen registrations for this session are cleared. </P ></DD ></DL ></DIV ></DIV ><DIV CLASS="REFSECT1" ><A NAME="AEN45832" ></A ><H2 >Notes</H2 ><P > You may unlisten something you were not listening for; no warning or error will appear. </P ><P > At the end of each session, <TT CLASS="COMMAND" >UNLISTEN *</TT > is automatically executed. </P ></DIV ><DIV CLASS="REFSECT1" ><A NAME="AEN45837" ></A ><H2 >Examples</H2 ><P > To make a registration: </P><PRE CLASS="PROGRAMLISTING" >LISTEN virtual; NOTIFY virtual; Asynchronous notification "virtual" received from server process with PID 8448.</PRE ><P> </P ><P > Once <TT CLASS="COMMAND" >UNLISTEN</TT > has been executed, further <TT CLASS="COMMAND" >NOTIFY</TT > commands will be ignored: </P><PRE CLASS="PROGRAMLISTING" >UNLISTEN virtual; NOTIFY virtual; -- no NOTIFY event is received</PRE ><P> </P ></DIV ><DIV CLASS="REFSECT1" ><A NAME="AEN45845" ></A ><H2 >Compatibility</H2 ><P > There is no <TT CLASS="COMMAND" >UNLISTEN</TT > command in the SQL standard. </P ></DIV ><DIV CLASS="REFSECT1" ><A NAME="AEN45849" ></A ><H2 >See Also</H2 ><A HREF="sql-listen.html" ><I >LISTEN</I ></A >, <A HREF="sql-notify.html" ><I >NOTIFY</I ></A ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="sql-truncate.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" ACCESSKEY="H" >Home</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="sql-update.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >TRUNCATE</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="sql-commands.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >UPDATE</TD ></TR ></TABLE ></DIV ></BODY ></HTML >