pg-num-fields.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<!-- EN-Revision: c2eca73ef79ebe78cebb34053e41b565af504c4f Maintainer: dallas Status: ready -->
<!-- CREDITS: mowangjuanzi -->
<!-- splitted from ./en/functions/pgsql.xml, last change in rev 1.2 -->
<refentry xml:id="function.pg-num-fields" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>pg_num_fields</refname>
   <refpurpose>返回结果中字段的数量</refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>int</type><methodname>pg_num_fields</methodname>
   <methodparam><type>PgSql\Result</type><parameter>result</parameter></methodparam>
  </methodsynopsis>
  <para>
   <function>pg_num_fields</function> 返回 <classname>PgSql\Result</classname> 实例中字段（列）的数量。
  </para>
  <note>
   <para>
    本函数以前的名字为 <function>pg_numfields</function>。
   </para>
  </note>
 </refsect1>

<refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>result</parameter></term>
     <listitem>
      &pgsql.parameter.result;
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   结果中的字段（列）的数量。错误时返回 -1。
  </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_num_fields</function> 示例</title>
    <programlisting role="php">
<![CDATA[
<?php
$result = pg_query($conn, "SELECT 1, 2");

$num = pg_num_fields($result);

echo $num . " field(s) returned.\n";
?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
2 field(s) returned.
]]>
    </screen>
   </example>
  </para>
 </refsect1>

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

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