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.
导出成的sql语句效果,具体代码如下:
- <?php
- header("Content-type:text/html;charset=utf-8");
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-
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- $cfg_dbhost = 'localhost';
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- $cfg_dbname = 'ftdm';
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- $cfg_dbuser = 'root';
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- $cfg_dbpwd = 'root';
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- $cfg_db_language = 'utf8';
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- $to_file_name = "ftdm.sql";
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- $link = mysql_connect($cfg_dbhost,$cfg_dbuser,$cfg_dbpwd);
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- mysql_select_db($cfg_dbname);
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- mysql_query("set names ".$cfg_db_language);
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- $tables = mysql_list_tables($cfg_dbname);
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- $tabList = array();
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- while($row = mysql_fetch_row($tables)){
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- $tabList[] = $row[0];
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- }
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-
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- echo "运行中,请耐心等待...<br/>";
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- $info = "-- ----------------------------rn";
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- $info .= "-- 日期:".date("Y-m-d H:i:s",time())."rn";
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- $info .= "-- Power by 代潇瑞博客(http://www.phpfensi.com/read/34.html)rn";
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- $info .= "-- 仅用于测试和学习,本程序不适合处理超大量数据rn";
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- $info .= "-- ----------------------------rnrn";
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- file_put_contents($to_file_name,$info,FILE_APPEND);
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-
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- foreach($tabList as $val){
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- $sql = "show create table ".$val;
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- $res = mysql_query($sql,$link);
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- $row = mysql_fetch_array($res);
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- $info = "-- ----------------------------rn";
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- $info .= "-- Table structure for `".$val."`rn";
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- $info .= "-- ----------------------------rn";
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- $info .= "DROP TABLE IF EXISTS `".$val."`;rn";
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- $sqlStr = $info.$row[1].";rnrn";
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- file_put_contents($to_file_name,$sqlStr,FILE_APPEND);
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- mysql_free_result($res);
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- }
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-
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- foreach($tabList as $val){
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- $sql = "select * from ".$val;
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- $res = mysql_query($sql,$link);
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- if(mysql_num_rows($res)<1) continue;
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- $info = "-- ----------------------------rn";
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- $info .= "-- Records for `".$val."`rn";
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- $info .= "-- ----------------------------rn";
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- file_put_contents($to_file_name,$info,FILE_APPEND);
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-
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- while($row = mysql_fetch_row($res)){
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- $sqlStr = "INSERT INTO `".$val."` VALUES (";
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- foreach($row as $zd){
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- $sqlStr .= "'".$zd."', ";
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- }
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- $sqlStr = substr($sqlStr,0,strlen($sqlStr)-2);
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- $sqlStr .= ");rn";
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- file_put_contents($to_file_name,$sqlStr,FILE_APPEND);
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- }
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- mysql_free_result($res);
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- file_put_contents($to_file_name,"rn",FILE_APPEND);
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- }
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- echo "OK!";
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- ?>
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