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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_open</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-exec.html" title="dblink_exec" /><link rel="next" href="contrib-dblink-fetch.html" title="dblink_fetch" /></head><body id="docContent" class="container-fluid col-10"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">dblink_open</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="contrib-dblink-exec.html" title="dblink_exec">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="dblink.html" title="F.12. dblink">Up</a></td><th width="60%" align="center">F.12. dblink</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 15.4 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="contrib-dblink-fetch.html" title="dblink_fetch">Next</a></td></tr></table><hr /></div><div class="refentry" id="CONTRIB-DBLINK-OPEN"><div class="titlepage"></div><a id="id-1.11.7.21.10.1" class="indexterm"></a><div class="refnamediv"><h2><span class="refentrytitle">dblink_open</span></h2><p>dblink_open — opens a cursor in a remote database</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><pre class="synopsis">
+dblink_open(text cursorname, text sql [, bool fail_on_error]) returns text
+dblink_open(text connname, text cursorname, text sql [, bool fail_on_error]) returns text
+</pre></div><div class="refsect1" id="id-1.11.7.21.10.5"><h2>Description</h2><p>
+    <code class="function">dblink_open()</code> opens a cursor in a remote database.
+    The cursor can subsequently be manipulated with
+    <code class="function">dblink_fetch()</code> and <code class="function">dblink_close()</code>.
+   </p></div><div class="refsect1" id="id-1.11.7.21.10.6"><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; omit this parameter to use the
+       unnamed connection.
+      </p></dd><dt><span class="term"><em class="parameter"><code>cursorname</code></em></span></dt><dd><p>
+       The name to assign to this cursor.
+      </p></dd><dt><span class="term"><em class="parameter"><code>sql</code></em></span></dt><dd><p>
+       The <code class="command">SELECT</code> statement that you wish to execute in the remote
+       database, for example <code class="literal">select * from pg_class</code>.
+      </p></dd><dt><span class="term"><em class="parameter"><code>fail_on_error</code></em></span></dt><dd><p>
+       If true (the default when omitted) then an error thrown on the
+       remote side of the connection causes an error to also be thrown
+       locally. If false, the remote error is locally reported as a NOTICE,
+       and the function's return value is set to <code class="literal">ERROR</code>.
+      </p></dd></dl></div></div><div class="refsect1" id="id-1.11.7.21.10.7"><h2>Return Value</h2><p>
+    Returns status, either <code class="literal">OK</code> or <code class="literal">ERROR</code>.
+   </p></div><div class="refsect1" id="id-1.11.7.21.10.8"><h2>Notes</h2><p>
+    Since a cursor can only persist within a transaction,
+    <code class="function">dblink_open</code> starts an explicit transaction block
+    (<code class="command">BEGIN</code>) on the remote side, if the remote side was
+    not already within a transaction.  This transaction will be
+    closed again when the matching <code class="function">dblink_close</code> is
+    executed.  Note that if
+    you use <code class="function">dblink_exec</code> to change data between
+    <code class="function">dblink_open</code> and <code class="function">dblink_close</code>,
+    and then an error occurs or you use <code class="function">dblink_disconnect</code> before
+    <code class="function">dblink_close</code>, your change <span class="emphasis"><em>will be
+    lost</em></span> because the transaction will be aborted.
+   </p></div><div class="refsect1" id="id-1.11.7.21.10.9"><h2>Examples</h2><pre class="screen">
+SELECT dblink_connect('dbname=postgres options=-csearch_path=');
+ dblink_connect
+----------------
+ OK
+(1 row)
+
+SELECT dblink_open('foo', 'select proname, prosrc from pg_proc');
+ dblink_open
+-------------
+ OK
+(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-exec.html" title="dblink_exec">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="dblink.html" title="F.12. dblink">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="contrib-dblink-fetch.html" title="dblink_fetch">Next</a></td></tr><tr><td width="40%" align="left" valign="top">dblink_exec </td><td width="20%" align="center"><a accesskey="h" href="index.html" title="PostgreSQL 15.4 Documentation">Home</a></td><td width="40%" align="right" valign="top"> dblink_fetch</td></tr></table></div></body></html>
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