mysql-select-db.xml

<?xml version="1.0" encoding="utf-8"?>
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<refentry xml:id="function.mysql-select-db" xmlns="http://docbook.org/ns/docbook">
   <refnamediv>
    <refname>mysql_select_db</refname>
    <refpurpose>选择 MySQL 数据库</refpurpose>
 </refnamediv>

 <refsynopsisdiv>
  <warning>
   &mysql.alternative.note;
   <simplelist role="alternatives">
    <member><function>mysqli_select_db</function></member>
    <member><methodname>PDO::__construct</methodname> (part of dsn)</member>
   </simplelist>
  </warning>
 </refsynopsisdiv>

 <refsect1 role="description">
  &reftitle.description;
     <methodsynopsis>
      <type>bool</type><methodname>mysql_select_db</methodname>
      <methodparam><type>string</type><parameter>database_name</parameter></methodparam>
      <methodparam choice="opt"><type>resource</type><parameter>
        link_identifier
       </parameter></methodparam>
     </methodsynopsis>
    <para>
     &return.success;
    </para>
    <para>
     <function>mysql_select_db</function>
     设定与指定的连接标识符所关联的服务器上的当前激活数据库。如果没有指定连接标识符，则使用上一个打开的连接。如果没有打开的连接，本函数将无参数调用
     <function>mysql_connect</function> 来尝试打开一个并使用之。
    </para>
    <para>
     每个其后的
     <function>mysql_query</function>
     调用都会作用于活动数据库。
    </para>
    <para>
     <example>
      <title><function>mysql_select_db</function> 例子</title>
      <programlisting role="php">
<![CDATA[
<?php

$lnk = mysql_connect('localhost', 'mysql_user', 'mysql_password')
       or die ('Not connected : ' . mysql_error());

// make foo the current db
mysql_select_db('foo', $lnk) or die ('Can\'t use foo : ' . mysql_error());

?>
]]>
      </programlisting>
     </example>
    </para>
    <para>
     参见
     <function>mysql_connect</function>，<function>mysql_pconnect</function> 和
     <function>mysql_query</function>。
    </para>
    <para>
     为向下兼容仍然可以使用
     <function>mysql_selectdb</function>，但反对这样做。
    </para>
   </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>database_name</parameter></term>
     <listitem>
      <para>
       The name of the database that is to be selected.
      </para>
     </listitem>
    </varlistentry>
    &mysql.linkid.description;
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   &return.success;
  </para>
 </refsect1>

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

$link = mysql_connect('localhost', 'mysql_user', 'mysql_password');
if (!$link) {
    die('Not connected : ' . mysql_error());
}

// make foo the current db
$db_selected = mysql_select_db('foo', $link);
if (!$db_selected) {
    die ('Can\'t use foo : ' . mysql_error());
}
?>
]]>
    </programlisting>
   </example>
  </para>
 </refsect1>

 <refsect1 role="notes">
  &reftitle.notes;
  <note>
   <para>
    &info.deprecated.alias;
    <function>mysql_selectdb</function>
   </para>
  </note>
 </refsect1>

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

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