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<?php

//宋正河 转载请注明出处

set_time_limit(0);

header('content-type:text/html;charset=utf-8');

mysql_connect('localhost','root','root');

mysql_select_db('test');

$table_array=get_tables('test');

mysql_query('set names utf8');

$filesize=1024*1024*4;

$start=$_GET['start']?$_GET['start']:0;

$part=$_GET['part']?$_GET['part']:'1';

$table_index=$_GET['table_index']?$_GET['table_index']:'0';

$table=$table_array[$table_index];

$num=200000000;//这个数要足够大,可以是总记录数

$backupdata='';

if($start=='0'){

$query="SHOW CREATE TABLE `{$table}`";

$result = mysql_query($query);

$row = mysql_fetch_row($result);

$backupdata .= "DROP TABLE IF EXISTS `{$table}`;\n" . $row[1] . ";\n\n";

}

$limit=($start=='0')?'':" limit $start,$num ";

$query="select * from `{$table}` $limit ";

$result=mysql_query($query);

$numfields = mysql_num_fields($result); //统计字段数

while($row=mysql_fetch_row($result)){

$comma = ''; //存储逗号

$backupdata_tmp = "INSERT INTO `{$table}` VALUES (";

for($i=0; $i<$numfields; $i++){

$backupdata_tmp .= $comma . "'" . mysql_escape_string($row[$i]) . "'";

$comma = ',';

}

$backupdata_tmp .= ");\n";

if(strlen($backupdata)+strlen($backupdata_tmp) > $filesize){

//写入文件并跳转

$file='data/'.$table.'-'.$part.'.sql';

file_put_contents($file,$backupdata);

echo $file.' 备份完成，程序继续进行！';

$part++;

//分段

//表名

//起点

//跳转

sleep(3);

echo "<script>location.href='?start={$start}&table_index={$table_index}&part={$part}';</script>";

exit;

}

$backupdata.=$backupdata_tmp;

$start++;

}

if($backupdata){

$file='data/'.$table.'-'.$part.'.sql';

file_put_contents($file,$backupdata);

}

echo $table.'备份完成！<br />';

sleep(2);

$table_index++;

if($table_array[$table_index]){

echo "<script>location.href='?table_index={$table_index}';</script>";

exit;

}else{

echo '恭喜你，数据库备份完毕！';

}

function get_tables($db){

$tq = mysql_list_tables($db);

while($tr = mysql_fetch_row($tq)){

$arrtb[] = $tr[0];

}

return $arrtb;

}

?>