<?xml version="1.0" encoding="utf-8"?>
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<refentry xml:id="function.pg-result-error-field" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>pg_result_error_field</refname>
  <refpurpose>Returns an individual field of an error report</refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type class="union"><type>string</type><type>false</type><type>null</type></type><methodname>pg_result_error_field</methodname>
   <methodparam><type>PgSql\Result</type><parameter>result</parameter></methodparam>
   <methodparam><type>int</type><parameter>field_code</parameter></methodparam>
  </methodsynopsis>
  <para>
   <function>pg_result_error_field</function> returns one of the detailed error message
   fields associated with <parameter>result</parameter> instance. It is only available
   against a PostgreSQL 7.4 or above server.  The error field is specified by
   the <parameter>field_code</parameter>.
  </para>
  <para>
   Because <function>pg_query</function> and <function>pg_query_params</function> return &false; if the query fails,
   you must use <function>pg_send_query</function> and
   <function>pg_get_result</function> to get the result handle.
  </para>
  <para>
   If you need to get additional error information from failed <function>pg_query</function> queries,  
   use <function>pg_set_error_verbosity</function> and <function>pg_last_error</function>
   and then parse the result.
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>result</parameter></term>
     <listitem>
      &pgsql.parameter.result;
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>field_code</parameter></term>
     <listitem>
        <para>
         Possible <parameter>field_code</parameter> values are: <constant>PGSQL_DIAG_SEVERITY</constant>,
         <constant>PGSQL_DIAG_SQLSTATE</constant>, <constant>PGSQL_DIAG_MESSAGE_PRIMARY</constant>,
         <constant>PGSQL_DIAG_MESSAGE_DETAIL</constant>,
         <constant>PGSQL_DIAG_MESSAGE_HINT</constant>, <constant>PGSQL_DIAG_STATEMENT_POSITION</constant>,
         <constant>PGSQL_DIAG_INTERNAL_POSITION</constant> (PostgreSQL 8.0+ only),
         <constant>PGSQL_DIAG_INTERNAL_QUERY</constant> (PostgreSQL 8.0+ only),
         <constant>PGSQL_DIAG_CONTEXT</constant>, <constant>PGSQL_DIAG_SOURCE_FILE</constant>,
         <constant>PGSQL_DIAG_SOURCE_LINE</constant> or
         <constant>PGSQL_DIAG_SOURCE_FUNCTION</constant>.
        </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>A <type>string</type> containing the contents of the error field, &null; if the field does not exist or &false;
  on failure.</para>
 </refsect1>

 <refsect1 role="changelog">
  &reftitle.changelog;
  <informaltable>
   <tgroup cols="2">
    <thead>
     <row>
      <entry>&Version;</entry>
      <entry>&Description;</entry>
     </row>
    </thead>
    <tbody>
     &pgsql.changelog.result-object;
    </tbody>
   </tgroup>
  </informaltable>
 </refsect1>
 
 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>pg_result_error_field</function> example</title>
    <programlisting role="php">
<![CDATA[
<?php
  $dbconn = pg_connect("dbname=publisher") or die("Could not connect");

  if (!pg_connection_busy($dbconn)) {
      pg_send_query($dbconn, "select * from doesnotexist;");
  }
  
  $res1 = pg_get_result($dbconn);
  echo pg_result_error_field($res1, PGSQL_DIAG_SQLSTATE);
?>
]]>
    </programlisting>
   </example>
  </para>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>pg_result_error</function></member>
   </simplelist>
  </para>
 </refsect1>
</refentry>
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