（1）定義一個db_dump函式如下：
<?PHP function db_dump($host,$user,$pwd,$db) { $mysqlconlink = mysql_connect($host,$user,$pwd , true); if (!$mysqlconlink) echo sprintf('No MySQL connection: %s',mysql_error())."<br/>"; mysql_set_charset( 'utf8', $mysqlconlink ); $mysqldblink = mysql_select_db($db,$mysqlconlink); if (!$mysqldblink) echo sprintf('No MySQL connection to database: %s',mysql_error())."<br/>"; $tabelstobackup=array(); $result=mysql_query("SHOW TABLES FROM `$db`"); if (!$result) echo sprintf('Database error %1$s for query %2$s', mysql_error(), "SHOW TABLE STATUS FROM `$db`;")."<br/>"; while ($data = mysql_fetch_row($result)) { $tabelstobackup[]=$data[0]; } if (count($tabelstobackup)>0) { $result=mysql_query("SHOW TABLE STATUS FROM `$db`"); if (!$result) echo sprintf('Database error %1$s for query %2$s', mysql_error(), "SHOW TABLE STATUS FROM `$db`;")."<br/>"; while ($data = mysql_fetch_assoc($result)) { $status[$data['Name']]=$data; } if ($file = fopen("$db.sql", 'wb')) { fwrite($file, "-- ---------------------------------------------------------\n"); fwrite($file, "-- Database Name: $db\n"); fwrite($file, "-- ---------------------------------------------------------\n\n"); fwrite($file, "/*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */;\n"); fwrite($file, "/*!40101 SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS */;\n"); fwrite($file, "/*!40101 SET @OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION */;\n"); fwrite($file, "/*!40101 SET NAMES '".mysql_client_encoding()."' */;\n"); fwrite($file, "/*!40103 SET @OLD_TIME_ZONE=@@TIME_ZONE */;\n"); fwrite($file, "/*!40103 SET TIME_ZONE='".mysql_result(mysql_query("SELECT @@time_zone"),0)."' */;\n"); fwrite($file, "/*!40014 SET @OLD_UNIQUE_CHECKS=@@UNIQUE_CHECKS, UNIQUE_CHECKS=0 */;\n"); fwrite($file, "/*!40014 SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0 */;\n"); fwrite($file, "/*!40101 SET @OLD_SQL_MODE=@@SQL_MODE, SQL_MODE='NO_AUTO_VALUE_ON_ZERO' */;\n"); fwrite($file, "/*!40111 SET @OLD_SQL_NOTES=@@SQL_NOTES, SQL_NOTES=0 */;\n\n"); foreach($tabelstobackup as $table) { echo sprintf('Dump database table "%s"',$table)."<br/>"; need_free_memory(($status[$table]['Data_length']+$status[$table]['Index_length'])*3); _db_dump_table($table,$status[$table],$file); } fwrite($file, "\n"); fwrite($file, "/*!40103 SET TIME_ZONE=@OLD_TIME_ZONE */;\n"); fwrite($file, "/*!40101 SET SQL_MODE=@OLD_SQL_MODE */;\n"); fwrite($file, "/*!40014 SET FOREIGN_KEY_CHECKS=@OLD_FOREIGN_KEY_CHECKS */;\n"); fwrite($file, "/*!40014 SET UNIQUE_CHECKS=@OLD_UNIQUE_CHECKS */;\n"); fwrite($file, "/*!40101 SET CHARACTER_SET_CLIENT=@OLD_CHARACTER_SET_CLIENT */;\n"); fwrite($file, "/*!40101 SET CHARACTER_SET_RESULTS=@OLD_CHARACTER_SET_RESULTS */;\n"); fwrite($file, "/*!40101 SET COLLATION_CONNECTION=@OLD_COLLATION_CONNECTION */;\n"); fwrite($file, "/*!40111 SET SQL_NOTES=@OLD_SQL_NOTES */;\n"); fclose($file); echo 'Database dump done!'."<br/>"; } else { echo 'Can not create database dump!'."<br/>"; } } else { echo 'No tables to dump'."<br/>"; } } function _db_dump_table($table,$status,$file) { fwrite($file, "\n"); fwrite($file, "--\n"); fwrite($file, "-- Table structure for table $table\n"); fwrite($file, "--\n\n"); fwrite($file, "DROP TABLE IF EXISTS `" . $table . "`;\n"); fwrite($file, "/*!40101 SET @saved_cs_client = @@character_set_client */;\n"); fwrite($file, "/*!40101 SET character_set_client = '".mysql_client_encoding()."' */;\n"); $result=mysql_query("SHOW CREATE TABLE `".$table."`"); if (!$result) { echo sprintf('Database error %1$s for query %2$s', mysql_error(), "SHOW CREATE TABLE `".$table."`")."<br/>"; return false; } $tablestruc=mysql_fetch_assoc($result); fwrite($file, $tablestruc['Create Table'].";\n"); fwrite($file, "/*!40101 SET character_set_client = @saved_cs_client */;\n"); $result=mysql_query("SELECT * FROM `".$table."`"); if (!$result) { echo sprintf('Database error %1$s for query %2$s', mysql_error(), "SELECT * FROM `".$table."`")."<br/>"; return false; } fwrite($file, "--\n"); fwrite($file, "-- Dumping data for table $table\n"); fwrite($file, "--\n\n"); if ($status['Engine']=='MyISAM') fwrite($file, "/*!40000 ALTER TABLE `".$table."` DISABLE KEYS */;\n"); while ($data = mysql_fetch_assoc($result)) { $keys = array(); $values = array(); foreach($data as $key => $value) { if($value === NULL) $value = "NULL"; elseif($value === "" or $value === false) $value = "''"; elseif(!is_numeric($value)) $value = "'".mysql_real_escape_string($value)."'"; $values[] = $value; } fwrite($file, "INSERT INTO `".$table."` VALUES ( ".implode(", ",$values)." );\n"); } if ($status['Engine']=='MyISAM') fwrite($file, "/*!40000 ALTER TABLE ".$table." ENABLE KEYS */;\n"); } function need_free_memory($memneed) { if (!function_exists('memory_get_usage')) return; $needmemory=@memory_get_usage(true)+inbytes($memneed); if ($needmemory>inbytes(ini_get('memory_limit'))) { $newmemory=round($needmemory/1024/1024)+1 .'M'; if ($needmemory>=1073741824) $newmemory=round($needmemory/1024/1024/1024) .'G'; if ($oldmem=@ini_set('memory_limit', $newmemory)) echo sprintf(__('Memory increased from %1$s to %2$s','backwpup'),$oldmem,@ini_get('memory_limit'))."<br/>"; else echo sprintf(__('Can not increase memory limit is %1$s','backwpup'),@ini_get('memory_limit'))."<br/>"; } } function inbytes($value) { $multi=strtoupper(substr(trim($value),-1)); $bytes=abs(intval(trim($value))); if ($multi=='G') $bytes=$bytes*1024*1024*1024; if ($multi=='M') $bytes=$bytes*1024*1024; if ($multi=='K') $bytes=$bytes*1024; return $bytes; } ?>
（2）使用方法：
db_dump('資料庫伺服器', '資料庫使用者名稱', '資料庫密碼', '資料庫名');