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>pg_result_error_field</H1
><DIV
CLASS="refnamediv"
><A
NAME="AEN186681"
></A
><P
>    (PHP 5 &#62;= 5.1.0RC1)</P
>pg_result_error_field&nbsp;--&nbsp;Returns an individual field of an error report.</DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN186684"
></A
><H2
>说明</H2
>string <B
CLASS="methodname"
>pg_result_error_field</B
> ( resource result, int fieldcode )<BR
></BR
><P
>&#13;   <B
CLASS="function"
>pg_result_error_field()</B
> returns one of the detailed error message
   fields associated with <CODE
CLASS="parameter"
>result</CODE
> resource. It is only available
   against a PostgreSQL 7.4 or above server.  The error field is specified by
   the <CODE
CLASS="parameter"
>fieldcode</CODE
>.
  </P
><P
>&#13;   Because <A
HREF="function.pg-query.html"
><B
CLASS="function"
>pg_query()</B
></A
> and <A
HREF="function.pg-query-params.html"
><B
CLASS="function"
>pg_query_params()</B
></A
> return <TT
CLASS="constant"
><B
>FALSE</B
></TT
> if the query fails,
   you must use <A
HREF="function.pg-send-query.html"
><B
CLASS="function"
>pg_send_query()</B
></A
> and
   <A
HREF="function.pg-get-result.html"
><B
CLASS="function"
>pg_get_result()</B
></A
> to get the result handle.
  </P
><P
>&#13;   If you need to get additional error information from failed <A
HREF="function.pg-query.html"
><B
CLASS="function"
>pg_query()</B
></A
> queries,  
   use <A
HREF="function.pg-set-error-verbosity.html"
><B
CLASS="function"
>pg_set_error_verbosity()</B
></A
> and <A
HREF="function.pg-last-error.html"
><B
CLASS="function"
>pg_last_error()</B
></A
>
   and then parse the result.
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN186709"
></A
><H2
>参数</H2
><P
>&#13;   <P
></P
><DIV
CLASS="variablelist"
><DL
><DT
><CODE
CLASS="parameter"
>result</CODE
></DT
><DD
><P
>&#13;       A PostgreSQL query result resource from a previously executed
       statement.
      </P
></DD
><DT
><CODE
CLASS="parameter"
>fieldcode</CODE
></DT
><DD
><P
>&#13;         Possible <CODE
CLASS="parameter"
>fieldcode</CODE
> values are: <TT
CLASS="constant"
><B
>PGSQL_DIAG_SEVERITY</B
></TT
>,
         <TT
CLASS="constant"
><B
>PGSQL_DIAG_SQLSTATE</B
></TT
>, <TT
CLASS="constant"
><B
>PGSQL_DIAG_MESSAGE_PRIMARY</B
></TT
>,
         <TT
CLASS="constant"
><B
>PGSQL_DIAG_MESSAGE_DETAIL</B
></TT
>,
         <TT
CLASS="constant"
><B
>PGSQL_DIAG_MESSAGE_HINT</B
></TT
>, <TT
CLASS="constant"
><B
>PGSQL_DIAG_STATEMENT_POSITION</B
></TT
>,
         <TT
CLASS="constant"
><B
>PGSQL_DIAG_INTERNAL_POSITION</B
></TT
> (PostgreSQL 8.0+ only),
         <TT
CLASS="constant"
><B
>PGSQL_DIAG_INTERNAL_QUERY</B
></TT
> (PostgreSQL 8.0+ only),
         <TT
CLASS="constant"
><B
>PGSQL_DIAG_CONTEXT</B
></TT
>, <TT
CLASS="constant"
><B
>PGSQL_DIAG_SOURCE_FILE</B
></TT
>,
         <TT
CLASS="constant"
><B
>PGSQL_DIAG_SOURCE_LINE</B
></TT
> or
         <TT
CLASS="constant"
><B
>PGSQL_DIAG_SOURCE_FUNCTION</B
></TT
>.
        </P
></DD
></DL
></DIV
>
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN186736"
></A
><H2
>返回值</H2
><P
>A <A
HREF="language.types.string.html"
><B
CLASS="type"
>string</B
></A
> containing the contents of the error field, <TT
CLASS="constant"
><B
>NULL</B
></TT
> if the field does not exist or <TT
CLASS="constant"
><B
>FALSE</B
></TT
>
  on failure.</P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN186742"
></A
><H2
>范例</H2
><P
>&#13;   <TABLE
WIDTH="100%"
BORDER="0"
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CLASS="EXAMPLE"
><TR
><TD
><DIV
CLASS="example"
><A
NAME="AEN186745"
></A
><P
><B
>例 1. <B
CLASS="function"
>pg_result_error_field()</B
> example</B
></P
><TABLE
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><TD
><code><font color="#000000">
<font color="#0000BB">&lt;?php<br />&nbsp;&nbsp;$dbconn </font><font color="#007700">= </font><font color="#0000BB">pg_connect</font><font color="#007700">(</font><font color="#DD0000">"dbname=publisher"</font><font color="#007700">) or die(</font><font color="#DD0000">"Could not connect"</font><font color="#007700">);<br /><br />&nbsp;&nbsp;if (!</font><font color="#0000BB">pg_connection_busy</font><font color="#007700">(</font><font color="#0000BB">$dbconn</font><font color="#007700">)) {<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">pg_send_query</font><font color="#007700">(</font><font color="#0000BB">$dbconn</font><font color="#007700">, </font><font color="#DD0000">"select * from doesnotexist;"</font><font color="#007700">);<br />&nbsp;&nbsp;}<br />&nbsp;&nbsp;<br />&nbsp;&nbsp;</font><font color="#0000BB">$res1 </font><font color="#007700">= </font><font color="#0000BB">pg_get_result</font><font color="#007700">(</font><font color="#0000BB">$dbconn</font><font color="#007700">);<br />&nbsp;&nbsp;echo </font><font color="#0000BB">pg_result_error_field</font><font color="#007700">(</font><font color="#0000BB">$res1</font><font color="#007700">, </font><font color="#0000BB">PGSQL_DIAG_SQLSTATE</font><font color="#007700">);<br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
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>
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN186749"
></A
><H2
>参见</H2
><P
>&#13;   <P
></P
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><A
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><B
CLASS="function"
>pg_result_error()</B
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