Sophie: postgresql8.3-docs-8.3.6-2mdv2008.1 x86

postgresql8.3-docs-8.3.6-2mdv2008.1.x86_64.rpm

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>PostgreSQL 8.3.6 Documentation</TH
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>UNLISTEN</H1
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><H2
>Name</H2
>UNLISTEN&nbsp;--&nbsp;stop listening for a notification</DIV
><A
NAME="AEN60862"
></A
><DIV
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><H2
>Synopsis</H2
><PRE
CLASS="SYNOPSIS"
>UNLISTEN { <TT
CLASS="REPLACEABLE"
><I
>name</I
></TT
> | * }</PRE
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><DIV
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><A
NAME="AEN60867"
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><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
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><A
NAME="AEN60880"
></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
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><A
NAME="AEN60893"
></A
><H2
>Notes</H2
><P
>   You can 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="AEN60898"
></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="AEN60906"
></A
><H2
>Compatibility</H2
><P
>   There is no <TT
CLASS="COMMAND"
>UNLISTEN</TT
> command in the SQL standard.
  </P
></DIV
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><A
NAME="AEN60910"
></A
><H2
>See Also</H2
><A
HREF="sql-listen.html"
><I
>LISTEN</I
></A
>, <A
HREF="sql-notify.html"
><I
>NOTIFY</I
></A
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