pg-last-error.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<!-- splitted from ./en/functions/pgsql.xml, last change in rev 1.2 -->
<refentry xml:id="function.pg-last-error" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>pg_last_error</refname>
  <refpurpose>Get the last error message string of a connection</refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>string</type><methodname>pg_last_error</methodname>
   <methodparam choice="opt"><type class="union"><type>PgSql\Connection</type><type>null</type></type><parameter>connection</parameter><initializer>&null;</initializer></methodparam>
  </methodsynopsis>
  <para>
   <function>pg_last_error</function> returns the last error message
   for a given <parameter>connection</parameter>. 
  </para>
  <para>
   Error messages may be overwritten by internal PostgreSQL (libpq)
   function calls. It may not return an appropriate error message if
   multiple errors occur inside a PostgreSQL module function.
  </para>
  <para>
   Use <function>pg_result_error</function>, <function>pg_result_error_field</function>,
   <function>pg_result_status</function> and
   <function>pg_connection_status</function> for better error handling.
  </para>
  <note>
   <para>
    This function used to be called <function>pg_errormessage</function>.
   </para>
  </note>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>connection</parameter></term>
     <listitem>
      &pgsql.parameter.connection-with-nullable-default;
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   A <type>string</type> containing the last error message on the 
   given <parameter>connection</parameter>.
  </para>
 </refsect1>

 <refsect1 role="changelog">
  &reftitle.changelog;
  <informaltable>
   <tgroup cols="2">
    <thead>
     <row>
      <entry>&Version;</entry>
      <entry>&Description;</entry>
     </row>
    </thead>
    <tbody>
     &pgsql.changelog.connection-object;
     <row>
      <entry>8.0.0</entry>
      <entry>
       <parameter>connection</parameter> is now nullable.
      </entry>
     </row>
    </tbody>
   </tgroup>
  </informaltable>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>pg_last_error</function> example</title>
    <programlisting role="php">
<![CDATA[
<?php
  $dbconn = pg_connect("dbname=publisher") or die("Could not connect");

  // Query that fails
  $res = pg_query($dbconn, "select * from doesnotexist");
  
  echo pg_last_error($dbconn);
?>
]]>
    </programlisting>
   </example>
  </para>
 </refsect1>
 
 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>pg_result_error</function></member>
    <member><function>pg_result_error_field</function></member>
   </simplelist>
  </para>
 </refsect1>
</refentry>
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