Document PDO::PGSQL_ATTR_DISABLE_PREPARES attribute

Closes GH-1167.

reference/pdo_pgsql/constants.xml

@@ -0,0 +1,46 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- $Revision$ -->
+<section xml:id="pdo-pgsql.constants" xmlns="http://docbook.org/ns/docbook">
+ &reftitle.constants;
+ &pdo.driver-constants;
+ <variablelist>
+  
+  <varlistentry xml:id="pdo.constants.pgsql-attr-disable-prepares">
+   <term>
+    <constant>PDO::PGSQL_ATTR_DISABLE_PREPARES</constant>
+     (<type>int</type>)
+   </term>
+   <listitem>
+    <para>
+     Send the query and the parameters to the server together in a single
+     call, avoiding the need to create a named prepared statement separately.
+     If the query is only going to be executed once this can reduce latency by
+     avoiding an unnecessary server round-trip.
+    </para>
+   </listitem>
+  </varlistentry>
+  
+ </variablelist>
+</section>
+
+<!-- Keep this comment at the end of the file
+Local variables:
+mode: sgml
+sgml-omittag:t
+sgml-shorttag:t
+sgml-minimize-attributes:nil
+sgml-always-quote-attributes:t
+sgml-indent-step:1
+sgml-indent-data:t
+indent-tabs-mode:nil
+sgml-parent-document:nil
+sgml-default-dtd-file:"~/.phpdoc/manual.ced"
+sgml-exposed-tags:nil
+sgml-local-catalogs:nil
+sgml-local-ecat-files:nil
+End:
+vim600: syn=xml fen fdm=syntax fdl=2 si
+vim: et tw=78 syn=sgml
+vi: ts=1 sw=1
+-->
+

reference/pdo_pgsql/reference.xml

@@ -25,6 +25,7 @@
    </section>
 
    &reference.pdo-pgsql.configure;
+   &reference.pdo-pgsql.constants;
 
    <section xml:id="pdo-pgsql.general-notes">
     <title>General notes</title>