php mysqli批量替换数据库表前缀实例

<?php
header ( 'http-equiv="Content-Type" content="text/html; charset=utf-8"' );
$DB_host = "localhost"; //数据库主机
$DB_user = "root"; //数据库用户
$DB_psw = "root3306"; //数据库密码
$DB_datebase = "gk_yue39_com"; //数据库名
$DB_charset = "utf8"; //数据库字符集
$dbprefix="yue392_com_";
$new_dbprefix="yue39_com_";
$db = new mysqli ( $DB_host, $DB_user, $DB_psw ); //实例化对象

//检查连接
if (mysqli_connect_errno ()) {
 printf ( "Connect failed: %sn", mysqli_connect_error () );
 exit ();
}

$db->select_db ( $DB_datebase ); //选择操作数据库

$db->set_charset ( $DB_charset ); //设置数据库字符集

//执行一个查询
$sql = 'show tables';
$result = $db->query ( $sql );

echo $result->num_rows . ' 行结果  ' . $result->field_count . ' 列内容<br/>';

//$result->data_seek('5');//从结果集中第5条开始取结果

echo '<table border="1" cellspacing="0" cellpadding="0" align="center" width="90%">';

//循环输出字段名
//$result->field_seek(2);//从字段集中第2条开始取结果
while ( true == ($field = $result->fetch_field ()) ) {
 echo '<th>' . $result->current_field . '_' . $field->name . '(' . $field->length . ')</th>';
}

//循环输出查询结果
while ( true == ($row = $result->fetch_assoc ()) ) {
 echo '<tr>';
 foreach ( $row as $col ) {
$sql="rename table `".$col."` to `".str_replace ( $dbprefix, $new_dbprefix, $col)."`";
    if($db->query ( $sql )){
  echo '<td align="center">' . $sql. '</td><td><font color="blue"> success</font></td>';
  }else{
  echo '<td align="center">' . $sql. '</td><td><font color="red"> failed</font></td>';
  } 
  }
 echo '</tr>';
}

echo '</table>';
$result->free ();//释放结果集
$db->close (); //关闭连接
?>