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HomeBackend DevelopmentPHP TutorialPHP实现把MySQL数据库导出为.sql文件实例(仿PHPMyadmin导出功能)_php实例

用php代码实现数据库备份可以使网站的管理变得非常便捷,我们可以直接进后台操作就能完成数据库的备份。

关键技术:

1. 首先要得到该数据库中有哪些表,所用函数 mysql_list_tables(),然后可以将获取的所有表名存到一个数组。
2. show create table 表名 可以获取表结构。
3. select * from 表名 取出所有记录,用循环拼接成 insert into... 语句。

实现代码:

复制代码 代码如下:


 header("Content-type:text/html;charset=utf-8");

 //配置信息
 $cfg_dbhost = 'localhost';
 $cfg_dbname = 'ftdm';
 $cfg_dbuser = 'root';
 $cfg_dbpwd = 'root';
 $cfg_db_language = 'utf8';
 $to_file_name = "ftdm.sql";
 // END 配置

 //链接数据库
 $link = mysql_connect($cfg_dbhost,$cfg_dbuser,$cfg_dbpwd);
 mysql_select_db($cfg_dbname);
 //选择编码
 mysql_query("set names ".$cfg_db_language);
 //数据库中有哪些表
 $tables = mysql_list_tables($cfg_dbname);
 //将这些表记录到一个数组
 $tabList = array();
 while($row = mysql_fetch_row($tables)){
  $tabList[] = $row[0];
 }

 echo "运行中,请耐心等待...
";
 $info = "-- ----------------------------\r\n";
 $info .= "-- 日期:".date("Y-m-d H:i:s",time())."\r\n";
 $info .= "-- 仅用于测试和学习,本程序不适合处理超大量数据\r\n";
 $info .= "-- ----------------------------\r\n\r\n";
 file_put_contents($to_file_name,$info,FILE_APPEND);

 //将每个表的表结构导出到文件
 foreach($tabList as $val){
  $sql = "show create table ".$val;
  $res = mysql_query($sql,$link);
  $row = mysql_fetch_array($res);
  $info = "-- ----------------------------\r\n";
  $info .= "-- Table structure for `".$val."`\r\n";
  $info .= "-- ----------------------------\r\n";
  $info .= "DROP TABLE IF EXISTS `".$val."`;\r\n";
  $sqlStr = $info.$row[1].";\r\n\r\n";
  //追加到文件
  file_put_contents($to_file_name,$sqlStr,FILE_APPEND);
  //释放资源
  mysql_free_result($res);
 }

 //将每个表的数据导出到文件
 foreach($tabList as $val){
  $sql = "select * from ".$val;
  $res = mysql_query($sql,$link);
  //如果表中没有数据,则继续下一张表
  if(mysql_num_rows($res)  //
  $info = "-- ----------------------------\r\n";
  $info .= "-- Records for `".$val."`\r\n";
  $info .= "-- ----------------------------\r\n";
  file_put_contents($to_file_name,$info,FILE_APPEND);
  //读取数据
  while($row = mysql_fetch_row($res)){
   $sqlStr = "INSERT INTO `".$val."` VALUES (";
   foreach($row as $zd){
    $sqlStr .= "'".$zd."', ";
   }
   //去掉最后一个逗号和空格
   $sqlStr = substr($sqlStr,0,strlen($sqlStr)-2);
   $sqlStr .= ");\r\n";
   file_put_contents($to_file_name,$sqlStr,FILE_APPEND);
  }
  //释放资源
  mysql_free_result($res);
  file_put_contents($to_file_name,"\r\n",FILE_APPEND);
 }

 echo "OK!";

?>

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