由网上搜到，有更改。

文件名：db_backup.php

源代码如下：

复制代码 代码如下:

<?php

ini_set("max_execution_time", "180");//避免数据量过大，导出不全的情况出现。

/*

程序功能：mysql数据库备份功能

作者：唐小刚

说明：

本程序主要是从mysqladmin中提取出来，并作出一定的调整，希望对大家在用php编程时备份数据有一定帮助.

如果不要备份结构：请屏掉这句:echo get_table_structure($dbname, $table, $crlf).";$crlf$crlf";

如果不要备份内容：请屏掉这句:echo get_table_content($dbname, $table, $crlf);

修改者：何锦盛

修改时间：2009/11/7

修改内容：新增函数get_table_structure，注释掉了函数get_table_def，目的是获得更丰富的建表时的细节（如：ENGINE=InnoDB AUTO_INCREMENT=80 DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci COMMENT='商品信息变更信息'）

*/

$host="";//数据库地址

$dbname="";//这里配置数据库名

$username="";//用户名

$passw="";//这里配置密码

$filename=date("Y-m-d_H-i-s")."-".$dbname.".sql";

header("Content-disposition:filename=".$filename);//所保存的文件名

header("Content-type:application/octetstream");

header("Pragma:no-cache");

header("Expires:0");

//备份数据

$i = 0;

$crlf="rn";

global $dbconn;

$dbconn = mysql_connect($host,$username,$passw]);//数据库主机，用户名，密码

$db = mysql_select_db($dbname,$dbconn);

mysql_query("SET NAMES 'utf8'");

$tables =mysql_list_tables($dbname,$dbconn);

$num_tables = @mysql_numrows($tables);

print "-- filename=".$filename;

while($i < $num_tables)

{

$table=mysql_tablename($tables,$i);

print $crlf;

echo get_table_structure($dbname, $table, $crlf).";$crlf$crlf";

//echo get_table_def($dbname, $table, $crlf).";$crlf$crlf";

echo get_table_content($dbname, $table, $crlf);

$i++;

}

/*新增的获得详细表结构*/

function get_table_structure($db,$table,$crlf)

{

global $drop;

$schema_create = "";

if(!empty($drop)){ $schema_create .= "DROP TABLE IF EXISTS `$table`;$crlf";}

$result =mysql_db_query($db, "SHOW CREATE TABLE $table");

$row=mysql_fetch_array($result);

$schema_create .= $crlf."-- ".$row[0].$crlf;

$schema_create .= $row[1].$crlf;

Return $schema_create;

}

/*

//原来别人的取得数据库结构，但不完整

function get_table_def($db,$table,$crlf)

{

global $drop;

$schema_create = "";

if(!empty($drop))

$schema_create .= "DROP TABLE IF EXISTS `$table`;$crlf";

$schema_create .= "CREATE TABLE `$table` ($crlf";

$result = mysql_db_query($db, "SHOW full FIELDS FROM $table");

while($row = mysql_fetch_array($result))

{

$schema_create .= " `$row[Field]` $row[Type]";

if(isset($row["Default"]) && (!empty($row["Default"]) || $row["Default"] == "0"))

$schema_create .= " DEFAULT '$row[Default]'";

if($row["Null"] != "YES")

$schema_create .= " NOT NULL";

if($row["Extra"] != "")

$schema_create .= " $row[Extra]";

if($row["Comment"] != "")

$schema_create .= " Comment '$row[Comment]'";

$schema_create .= ",$crlf";

}

$schema_create = ereg_replace(",".$crlf."$", "", $schema_create);

$result = mysql_db_query($db, "SHOW KEYS FROM $table");

while($row = mysql_fetch_array($result))

{

$kname=$row['Key_name'];

if(($kname != "PRIMARY") && ($row['Non_unique'] == 0))

$kname="UNIQUE|$kname";

if(!isset($index[$kname]))

$index[$kname] = array();

$index[$kname][] = $row['Column_name'];

}

while(list($x,$columns) = @each($index))

{

$schema_create .= ",$crlf";

if($x == "PRIMARY")

$schema_create .= " PRIMARY KEY (".implode($columns,", ") . ")";

elseif (substr($x,0,6) == "UNIQUE")

$schema_create .= " UNIQUE ".substr($x,7)." (" . implode($columns, ", ") . ")";

else

$schema_create .= " KEY $x (" . implode($columns, ", ") . ")";

}

$schema_create .= "$crlf)";

return (stripslashes($schema_create));

}

*/

//获得表内容

function get_table_content($db, $table, $crlf)

{

$schema_create = "";

$temp = "";

$result = mysql_db_query($db, "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;

}

?>