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- <!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>dblink_get_notify</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 V1.79.1" /><link rel="prev" href="contrib-dblink-is-busy.html" title="dblink_is_busy" /><link rel="next" href="contrib-dblink-get-result.html" title="dblink_get_result" /></head><body><div xmlns="http://www.w3.org/TR/xhtml1/transitional" class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">dblink_get_notify</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="contrib-dblink-is-busy.html" title="dblink_is_busy">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="dblink.html" title="F.10. dblink">Up</a></td><th width="60%" align="center">F.10. dblink</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 12.4 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="contrib-dblink-get-result.html" title="dblink_get_result">Next</a></td></tr></table><hr></hr></div><div class="refentry" id="CONTRIB-DBLINK-GET-NOTIFY"><div class="titlepage"></div><a id="id-1.11.7.19.17.1" class="indexterm"></a><div class="refnamediv"><h2><span class="refentrytitle">dblink_get_notify</span></h2><p>dblink_get_notify — retrieve async notifications on a connection</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><pre class="synopsis">
- dblink_get_notify() returns setof (notify_name text, be_pid int, extra text)
- dblink_get_notify(text connname) returns setof (notify_name text, be_pid int, extra text)
- </pre></div><div class="refsect1" id="id-1.11.7.19.17.5"><h2>Description</h2><p>
- <code class="function">dblink_get_notify</code> retrieves notifications on either
- the unnamed connection, or on a named connection if specified.
- To receive notifications via dblink, <code class="function">LISTEN</code> must
- first be issued, using <code class="function">dblink_exec</code>.
- For details see <a class="xref" href="sql-listen.html" title="LISTEN"><span class="refentrytitle">LISTEN</span></a> and <a class="xref" href="sql-notify.html" title="NOTIFY"><span class="refentrytitle">NOTIFY</span></a>.
- </p></div><div class="refsect1" id="id-1.11.7.19.17.6"><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>connname</code></em></span></dt><dd><p>
- The name of a named connection to get notifications on.
- </p></dd></dl></div></div><div class="refsect1" id="id-1.11.7.19.17.7"><h2>Return Value</h2><p>Returns <code class="type">setof (notify_name text, be_pid int, extra text)</code>, or an empty set if none.</p></div><div class="refsect1" id="id-1.11.7.19.17.8"><h2>Examples</h2><pre class="screen">
- SELECT dblink_exec('LISTEN virtual');
- dblink_exec
- -------------
- LISTEN
- (1 row)
-
- SELECT * FROM dblink_get_notify();
- notify_name | be_pid | extra
- -------------+--------+-------
- (0 rows)
-
- NOTIFY virtual;
- NOTIFY
-
- SELECT * FROM dblink_get_notify();
- notify_name | be_pid | extra
- -------------+--------+-------
- virtual | 1229 |
- (1 row)
- </pre></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="contrib-dblink-is-busy.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="dblink.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="contrib-dblink-get-result.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">dblink_is_busy </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> dblink_get_result</td></tr></table></div></body></html>
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