php导出mysql源码

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="\r\n"; 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; }
?>

转自http://www.jb51.net/article/45352.htm