<?php
/*程序功能:mysql数据库备份功能*/
ini_set('max_execution_time','0');
ini_set('memory_limit','1024M');//加上这两行,可以备份大数据,昨晚测了一下公司的一个600M的表,很快就可以备份成功
$code_type = 'gbk';
header("Content-type:text/html;charset=$code_type");
header("Content-disposition: filename=backup.sql");//所保存的文件名
header("Content-type: application/octetstream");
header("Pragma: no-cache");
header("Expires: 0");
$conn = mysql_connect("localhost","root","root");
$db = mysql_select_db($dbname,$conn);
mysql_query("set names $code_type");
$dbname="test";//数据库名
$flag = '1';//1:全部备份,2:只备份表结构,3:只备份数据
echo back_database($dbname,$conn,$flag);//备份数据库
//开始备份
function back_database($dbname,$conn,$flag='1'){
$crlf="\r\n";
$str = '';
$now = date('Y年m月d日H点i分s秒',time());
$str .= "$crlf--$crlf-- 数据库: `$dbname`$crlf--$crlf-- 导出日期: `$now`$crlf--$crlf";
$str .= "$crlf--$crlf-- 作者: ****$crlf--$crlf-- QQ: 1019822077$crlf--$crlf";
$str .= "-- blog: http://hi.baidu.com/woaidelphi/blog$crlf--$crlf";
$str .= "SET SQL_MODE=\"NO_AUTO_VALUE_ON_ZERO\";$crlf";
$tables = mysql_list_tables($dbname,$conn);
$num_tables = mysql_numrows($tables);//表的总数
$i = 0;
while($i<$num_tables){//循环所有的表
$table = mysql_tablename($tables,$i);
//备份表结构
if($flag=='1' or $flag=='2'){
$query = mysql_query("SHOW CREATE TABLE $table");
$row = mysql_fetch_row($query);
$str .= "-- --------------------------------------------------------$crlf$crlf";
$str .= "--$crlf-- 表的结构 `$table` $crlf--$crlf";
$str .= $row[1].";$crlf--$crlf";
}
//备份表内容
if($flag=='1' or $flag=='3'){
$str .= "--$crlf-- 导出表中的数据 `$table` $crlf--$crlf";
$str .= get_table_content($dbname,$table);
$str .= "$crlf$crlf";
}
$i++;
}
return $str;
}
//得到表中的记录sql
function get_table_content($dbname,$table){
$crlf = "\r\n";
$schema_create = "";
$temp = "";
$result = mysql_db_query($dbname,"SELECT * FROM $table");
$i = 0;
while($row = mysql_fetch_row($result)){
$schema_insert = "INSERT INTO $table VALUES (";
for($j=0; $j<mysql_num_fields($result);$j++){
if(!isset($row[$j]))
$schema_insert .= " NULL,";
elseif($row[$j] != "")
$schema_insert .= " '".addslashes($row[$j])."',";
else
$schema_insert .= " '',";
}
$schema_insert = ereg_replace(",$", "", $schema_insert);
$schema_insert .= ");$crlf";
$temp = $temp.$schema_insert ;
$i++;
}
return $temp;
}