下面提供两种方法，仅供研究使用。

第1种方法：

复制代码 代码如下:

<?php

$host="localhost";

$user="root";

$password="";

$dbname="dbname";

mysql_connect($host,$user,$password);

mysql_select_db($dbname);

$mysql= "set names utf8;";

mysql_query($mysql);

$q1=mysql_query("show tables");

while($t=mysql_fetch_array($q1)){

$table=$t[0];

$q2=mysql_query("show create table `$table`");

$sql=mysql_fetch_array($q2);

$mysql.=$sql['Create Table'].";n";

$q3=mysql_query("select * from `$table`");

while($data=mysql_fetch_assoc($q3)){

$keys=array_keys($data);

$keys=array_map('addslashes',$keys);

$keys=join('`,`',$keys);

$keys="`".$keys."`";

$vals=array_values($data);

$vals=array_map('addslashes',$vals);

$vals=join("','",$vals);

$vals="'".$vals."'";

$mysql.="insert into `$table`($keys) values($vals);n";

}

$mysql.="n";

}

$filename=$dbname.date('Ymj').".sql";

$fp = fopen($filename,'w');

fputs($fp,$mysql);

fclose($fp);

echo "数据备份成功,生成备份文件".$filename;

?>

第2种方法：

复制代码 代码如下:

<?php

$host="localhost";

$user="root";

$password="";

$dbname="dbname";

backup_tables($host,$user,$password,$dbname);

/* backup the db OR just a table */

function backup_tables($host,$user,$pass,$name,$tables = '*')

{

$link = mysql_connect($host,$user,$pass);

mysql_select_db($name,$link);

//get all of the tables

if($tables == '*')

{

$tables = array();

$result = mysql_query('SHOW TABLES');

while($row = mysql_fetch_row($result))

{

$tables[] = $row[0];

}

}

else

{

$tables = is_array($tables) ? $tables : explode(',',$tables);

}

$return = '';

//cycle through

foreach($tables as $table)

{

$result = mysql_query('SELECT * FROM '.$table);

$num_fields = mysql_num_fields($result);

$return.= 'DROP TABLE '.$table.';';

$row2 = mysql_fetch_row(mysql_query('SHOW CREATE TABLE '.$table));

$return.= "nn".$row2[1].";nn";

for ($i = 0; $i < $num_fields; $i++)

{

while($row = mysql_fetch_row($result))

{

$return.= 'INSERT INTO '.$table.' VALUES(';

for($j=0; $j<$num_fields; $j++)

{

$row[$j] = addslashes($row[$j]);

$row[$j] = ereg_replace("n","n",$row[$j]);

if (isset($row[$j])) { $return.= '"'.$row[$j].'"' ; } else { $return.= '""'; }

if ($j<($num_fields-1)) { $return.= ','; }

}

$return.= ");n";

}

}

$return.="nnn";

}

//save file

$handle = fopen('db-backup-'.time().'-'.(md5(implode(',',$tables))).'.sql','w+');

fwrite($handle,$return);

fclose($handle);

}

?>