mysql-db-query.xml

<?xml version="1.0" encoding="utf-8"?>
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<refentry xml:id="function.mysql-db-query" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>mysql_db_query</refname>
  <refpurpose>选择数据库并执行查询</refpurpose>
 </refnamediv>

 <refsynopsisdiv>
  <warning>
   &mysql.alternative.note.5-3-0;
   <simplelist role="alternatives">
    <member><function>mysqli_select_db</function> 然后查询</member>
    <member><methodname>PDO::__construct</methodname></member>
   </simplelist>
  </warning>
 </refsynopsisdiv>

 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type class="union"><type>resource</type><type>bool</type></type><methodname>mysql_db_query</methodname>
   <methodparam><type>string</type><parameter>database</parameter></methodparam>
   <methodparam><type>string</type><parameter>query</parameter></methodparam>
   <methodparam choice="opt"><type>resource</type><parameter>link_identifier</parameter><initializer>NULL</initializer></methodparam>
  </methodsynopsis>
  <para>
   <function>mysql_db_query</function> 选择数据库并执行查询。
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>database</parameter></term>
     <listitem>
      <para>
       要选择的数据库名。
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>query</parameter></term>
     <listitem>
      <para>
       MySQL 查询。
      </para>
      <para>
       查询中的数据应<link
       linkend="function.mysql-real-escape-string">正确转义</link>。
      </para>
     </listitem>
    </varlistentry>
    &mysql.linkid.description;
   </variablelist>
  </para>
 </refsect1>
 
 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   返回正的 MySQL 结果资源到查询结果，出错时返回 &false;。本函数会对
   <literal>INSERT</literal>/<literal>UPDATE</literal>/<literal>DELETE</literal>
   查询返回 &true;/&false; 来指示成功或失败。
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title>替代 <function>mysql_db_query</function> 示例</title>
    <programlisting role="php">
<![CDATA[
<?php

if (!$link = mysql_connect('mysql_host', 'mysql_user', 'mysql_password')) {
    echo 'Could not connect to mysql';
    exit;
}

if (!mysql_select_db('mysql_dbname', $link)) {
    echo 'Could not select database';
    exit;
}

$sql    = 'SELECT foo FROM bar WHERE id = 42';
$result = mysql_query($sql, $link);

if (!$result) {
    echo "DB Error, could not query the database\n";
    echo 'MySQL Error: ' . mysql_error();
    exit;
}

while ($row = mysql_fetch_assoc($result)) {
    echo $row['foo'];
}

mysql_free_result($result);

?>
]]>
    </programlisting>
   </example>
  </para>
 </refsect1>

 <refsect1 role="notes">
  &reftitle.notes;
  <note>
   <para>
    注意此函数<emphasis role="strong">不会</emphasis>切换回先前连接到的数据库。换句话说，不能用此函数<emphasis>临时</emphasis>在另一个数据库上执行
    sql 查询，只能手工切换回来。强烈建议用户在 sql 查询中使用 <literal>database.table</literal> 语法或 <function>mysql_select_db</function> 替代此函数。
   </para>
  </note>
 </refsect1>

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

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