php实现数据库备份导出成sql

转载于：https://www.cnblogs.com/wydchn/articles/5007177.html

/**
     * 数据库备份
     */
    public function dbBackups($sPath='') {
        header("Content-type:text/html;charset=utf-8");
        //配置信息
        $cfg_dbhost = 'localhost';
        $cfg_dbname = 'dnname';
        $cfg_dbuser = 'dbuser';
        $cfg_dbpwd = 'dnpass';
        $cfg_db_language = 'utf8';
        $to_file_name = $sPath."databases_backup.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_query("SHOW TABLES FROM $cfg_dbname");
        //将这些表记录到一个数组
        $tabList = array();
        while($row = mysql_fetch_row($tables)) {
            $tabList[] = $row[0];
        }
        $sqldump = '';
        //echo "运行中，请耐心等待...<br/>";
        $info = "-- ----------------------------
";
        $info .= "-- 日期：".date("Y-m-d H:i:s",time())."
";
        $info .= "-- Power by 王永东博客(http://www.wangyongdong.com)
";
        $info .= "-- 仅用于测试和学习,本程序不适合处理超大量数据
";
        $info .= "-- ----------------------------

";
        //file_put_contents($to_file_name,$info,FILE_APPEND);
        $sqldump .= $info;
         
        //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 = "-- ----------------------------
";
            $info .= "-- Table structure for `".$val."`
";
            $info .= "-- ----------------------------
";
            $info .= "DROP TABLE IF EXISTS `".$val."`;
";
            $sqlStr = $info.$row[1].";

";
            //追加到文件
            //file_put_contents($to_file_name,$sqlStr,FILE_APPEND);
            $sqldump .= $sqlStr;
            //释放资源
            mysql_free_result($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)<1) continue;
            //
            $info = "-- ----------------------------
";
            $info .= "-- Records for `".$val."`
";
            $info .= "-- ----------------------------
";
            $sqldump .= $info;
            //file_put_contents($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 .= ");
";
                $sqldump .= $sqlStr;
                //file_put_contents($to_file_name,$sqlStr,FILE_APPEND);
            }
            //释放资源
            mysql_free_result($res);
            $sqldump .= '
';
            //file_put_contents($to_file_name,"
",FILE_APPEND);
        }
         
        $filename = 'ciblog_'. date('Ymd_His', time()).'.sql';
        header('Content-Type: text/x-sql');
        header("Content-Disposition:attachment;filename=".$filename);
         
        echo $sqldump;
    }

//将表结构导出到文件
        
            $sql = "show create table ".$database;
            $res = $this->db->query($sql,$link);
            $row = $this->db->fetch_array($res);
            $info = "-- ----------------------------
";
            $info .= "-- Table structure for `".$database."`
";
            $info .= "-- ----------------------------
";
            $info .= "DROP TABLE IF EXISTS `".$database."`;
";
            $sqlStr = $info.$row[0]['Create Table'].";

";
            //追加到文件
            //file_put_contents($to_file_name,$sqlStr,FILE_APPEND);
            $sqldump .= $sqlStr;
     //    // //将表的数据导出到文件
            $sql = "select * from ".$database;
            $res = $this->db->query($sql);

            $info = "-- ----------------------------
";
            $info .= "-- Records for `".$database."`
";
            $info .= "-- ----------------------------
";
            $sqldump .= $info;
            //file_put_contents($to_file_name,$info,FILE_APPEND);
     //        //读取数据
            $row = $this->db->fetch_array($res);
            if ($row) {
	            foreach($row as $val){
            		$sqlStr = "INSERT INTO `".$database."` VALUES (";
	            	foreach($val as $v){
		                $sqlStr .= "'".$v."', ";
		            }
		            //去掉最后一个逗号和空格
		            $sqlStr = substr($sqlStr,0,strlen($sqlStr)-2);
		            $sqlStr .= ");
";
		            $sqldump .= $sqlStr;
	            }
            
            }
            //file_put_contents($to_file_name,$sqlStr,FILE_APPEND);

            $sqldump .= "
";
            //file_put_contents($to_file_name,"
",FILE_APPEND);
         
        $filename = 'ciblog_'. date('Ymd_His', time()).'.sql';
        header('Content-Type: text/x-sql');
        header("Content-Disposition:attachment;filename=".$filename);