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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_cancel_query</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="contrib-dblink-get-result.html" title="dblink_get_result" /><link rel="next" href="contrib-dblink-get-pkey.html" title="dblink_get_pkey" /></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_cancel_query</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="contrib-dblink-get-result.html" title="dblink_get_result">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 11.5 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="contrib-dblink-get-pkey.html" title="dblink_get_pkey">Next</a></td></tr></table><hr></hr></div><div class="refentry" id="CONTRIB-DBLINK-CANCEL-QUERY"><div class="titlepage"></div><a id="id-1.11.7.19.19.1" class="indexterm"></a><div class="refnamediv"><h2><span class="refentrytitle">dblink_cancel_query</span></h2><p>dblink_cancel_query — cancels any active query on the named connection</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><pre class="synopsis">
dblink_cancel_query(text connname) returns text
</pre></div><div class="refsect1" id="id-1.11.7.19.19.5"><h2>Description</h2><p>
<code class="function">dblink_cancel_query</code> attempts to cancel any query that
is in progress on the named connection. Note that this is not
certain to succeed (since, for example, the remote query might
already have finished). A cancel request simply improves the
odds that the query will fail soon. You must still complete the
normal query protocol, for example by calling
<code class="function">dblink_get_result</code>.
</p></div><div class="refsect1" id="id-1.11.7.19.19.6"><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>connname</code></em></span></dt><dd><p>
Name of the connection to use.
</p></dd></dl></div></div><div class="refsect1" id="id-1.11.7.19.19.7"><h2>Return Value</h2><p>
Returns <code class="literal">OK</code> if the cancel request has been sent, or
the text of an error message on failure.
</p></div><div class="refsect1" id="id-1.11.7.19.19.8"><h2>Examples</h2><pre class="programlisting">
SELECT dblink_cancel_query('dtest1');
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