mysql-result.xml

<?xml version="1.0" encoding="utf-8"?>
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<refentry xml:id="function.mysql-result" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>mysql_result</refname>
  <refpurpose>取得结果数据</refpurpose>
 </refnamediv>

 <refsynopsisdiv>
  <warning>
   &mysql.alternative.note;
   <simplelist role="alternatives">
    <member>
     <function>mysqli_data_seek</function> 与
     <function>mysqli_field_seek</function> 和
     <function>mysqli_fetch_field</function> 结合使用
    </member>
    <member><methodname>PDOStatement::fetchColumn</methodname></member>
   </simplelist>
  </warning>
 </refsynopsisdiv>

 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>string</type><methodname>mysql_result</methodname>
   <methodparam><type>resource</type><parameter>result</parameter></methodparam>
   <methodparam><type>int</type><parameter>row</parameter></methodparam>
   <methodparam choice="opt"><type>mixed</type><parameter>field</parameter><initializer>0</initializer></methodparam>
  </methodsynopsis>
  <para>
   Retrieves the contents of one cell from a MySQL result set.
  </para>
  <para>
   When working on large result sets, you should consider using one
   of the functions that fetch an entire row (specified below).  As
   these functions return the contents of multiple cells in one
   function call, they're MUCH quicker than
   <function>mysql_result</function>.  Also, note that specifying a
   numeric offset for the field argument is much quicker than
   specifying a fieldname or tablename.fieldname argument.
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    &mysql.result.description;
    <varlistentry>
     <term><parameter>row</parameter></term>
     <listitem>
      <para>
       The row number from the result that's being retrieved. Row numbers 
       start at <literal>0</literal>.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>field</parameter></term>
     <listitem>
      <para>
       The name or offset of the field being retrieved.
      </para>
      <para>
       It can be the field's offset, the field's name, or the field's table 
       dot field name (tablename.fieldname). If the column name has been
       aliased ('select foo as bar from...'), use the alias instead of the 
       column name. If undefined, the first field is retrieved.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   The contents of one cell from a MySQL result set on success, or 
   &false; on failure.
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>mysql_result</function> 示例</title>
    <programlisting role="php">
<![CDATA[
<?php
$link = mysql_connect('localhost', 'mysql_user', 'mysql_password');
if (!$link) {
    die('Could not connect: ' . mysql_error());
}
if (!mysql_select_db('database_name')) {
    die('Could not select database: ' . mysql_error());
}
$result = mysql_query('SELECT name FROM work.employee');
if (!$result) {
    die('Could not query:' . mysql_error());
}
echo mysql_result($result, 2); // outputs third employee's name

mysql_close($link);
?>
]]>
    </programlisting>
   </example>
  </para>
 </refsect1>

 <refsect1 role="notes">
  &reftitle.notes;
  <note>
   <para>
    Calls to <function>mysql_result</function> should not be mixed
    with calls to other functions that deal with the result set.
   </para>
  </note>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>mysql_fetch_row</function></member>
    <member><function>mysql_fetch_array</function></member>
    <member><function>mysql_fetch_assoc</function></member>
    <member><function>mysql_fetch_object</function></member>
   </simplelist>
  </para>
 </refsect1>
</refentry>

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