在我们开发中数据库备份是很重要的环节,下面我们来分享两个php备份mysql数据库类,有需要的朋友可稍加修改即可使用.
先看备份的类文件backdata.class.php,代码如下:
- <?php
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- class backupData{
- private $mysql_link;
- private $dbName;
- private $dataDir;
- private $tableNames;
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- public function __construct($mysql_link){
- $this->mysql_link = $mysql_link;
- }
- public function backupTables($dbName,$dataDir,$tableNames){
- $this->dbName = $dbName;
- $this->dataDir = $dataDir;
- $this->tableNames = $tableNames;
- $tables=$this->delarray($this->tableNames);
- $sqls='';
- foreach($tables as $tablename){
- if($tablename==''){
- continue;
- }
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- $sqls .= "DROP TABLE IF EXISTS $tablename;n";
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- $rs = mysql_query("SHOW CREATE TABLE $tablename",$this->mysql_link);
- $row=mysql_fetch_row($rs);
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- $sqls.=$row['1'].";nn";
- unset($rs);
- unset($row);
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- $rs=mysql_query("select * from $tablename",$this->mysql_link);
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- $field=mysql_num_fields($rs);
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- while($rows=mysql_fetch_row($rs)){
- $comma='';
- $sqls.="INSERT INTO `$tablename` VALUES(";
- for($i=0;$i<$field;$i++){
- $sqls.=$comma."'".$rows[$i]."'";
- $comma=',';
- }
- $sqls.=");nnn";
- }
- }
- $backfilepath=$this->dataDir.date("Ymdhis",time()).'.sql';
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- $filehandle = fopen($backfilepath, "w");
- fwrite($filehandle, $sqls);
- fclose($filehandle);
- }
- private function delarray($array){
- foreach($array as $tables){
- if($tables=='*'){
- $newtables=mysql_list_tables($this->dbName,$this->mysql_link);
- $tableList = array();
- for ($i = 0; $i < mysql_numrows($newtables); $i++){
- array_push($tableList,mysql_tablename($newtables, $i));
- }
- $tableList=$tableList;
- }else{
- $tableList=$array;
- break;
- }
- }
- return $tableList;
- }
- }
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- ?>
数据库备份用法,代码如下:
- require_once("backdata.class.php");
- $link = @mysql_connect("localhost","数据库名","密码") or die ('Could not connect to server.');
- mysql_query("use cms",$link);
- mysql_query("set names utf8",$link);
- $dbbck=new backupData($link);
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- $dbbck->backupTables("cms","./",array('*'));
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- $dbbck->backupTables("cms","./",array('user'));
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- $dbbck->backupTables("cms","./",array('user','acl','informatoin'));
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参1为:数据库名.
参2为:要存放备份数据的位置,即目录地址.
第三个为:你要保存那些表.
再来分享一个数据库备份类,代码如下:
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- class data {
- public $data_dir = "class/";
- public $transfer ="";
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- function connect_db($host,$user,$pwd,$db,$charset='gbk'){
- if(!$conn = mysql_connect($host,$user,$pwd)){
- return false;
- }
- mysql_select_db($db);
- mysql_query("set names $charset");
- return true;
- }
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- public function set_sql($table,$subsection=0,&$tabledom=''){
- $tabledom .= "drop table if exists $tablen";
- $createtable = mysql_query("show create table $table");
- $create = mysql_fetch_row($createtable);
- $create[1] = str_replace("n","",$create[1]);
- $create[1] = str_replace("t","",$create[1]);
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- $tabledom .= $create[1].";n";
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- $rows = mysql_query("select * from $table");
- $numfields = mysql_num_fields($rows);
- $numrows = mysql_num_rows($rows);
- $n = 1;
- $sqlarry = array();
- while ($row = mysql_fetch_row($rows)){
- $comma = "";
- $tabledom .= "insert into $table values(";
- for($i = 0; $i < $numfields; $i++)
- {
- $tabledom .= $comma."'".mysql_escape_string($row[$i])."'";
- $comma = ",";
- }
- $tabledom .= ")n";
- if($subsection != 0 && strlen($this->transfer )>=$subsection*1000){
- $sqlarry[$n]= $tabledom;
- $tabledom = ''; $n++;
- }
- }
- return $sqlarry;
- }
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- public function get_db_table($database){
- $result = mysql_list_tables($database);
- while($tmparry = mysql_fetch_row($result)){
- $dbarry[] = $tmparry[0];
- }
- return $dbarry;
- }
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- function check_write_dir($dir){
- if(!is_dir($dir)) {@mkdir($dir, 0777);}
- if(is_dir($dir)){
- if($link = opendir($dir)){
- $filearry = scandir($dir);
- for($i=0;$i<count($filearry);$i++){
- if($filearry[$i]!='.' || $filearry != '..'){
- @unlink($dir.$filearry[$i]);
- }
- }
- }
- }
- return true;
- }
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- private function write_sql($filename,$str){
- $re= true;
- if(!@$fp=fopen($filename,"w+")) {$re=false; echo "在打开文件时遇到错误,备份失败!";}
- if(!@fwrite($fp,$str)) {$re=false; echo "在写入信息时遇到错误,备份失败!";}
- if(!@fclose($fp)) {$re=false; echo "在关闭文件 时遇到错误,备份失败!";}
- return $re;
- }
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- public function export_sql($table,$subsection=0){
- if(!$this->check_write_dir($this->data_dir)){echo '您没有权限操作目录,备份失败';return false;}
- if($subsection == 0){
- if(!is_array($table)){
- $this->set_sql($table,0,$this->transfer);
- }else{
- for($i=0;$i<count($table);$i++){
- $this->set_sql($table[$i],0,$this->transfer);
- }
- }
- $filename = $this->data_dir.date("ymd",time()).'_all.sql';
- if(!$this->write_sql($filename,$this->transfer)){return false;}
- }else{
- if(!is_array($table)){
- $sqlarry = $this->set_sql($table,$subsection,$this->transfer);
- $sqlarry[] = $this->transfer;
- }else{
- $sqlarry = array();
- for($i=0;$i<count($table);$i++){
- $tmparry = $this->set_sql($table[$i],$subsection,$this->transfer);
- $sqlarry = array_merge($sqlarry,$tmparry);
- }
- $sqlarry[] = $this->transfer;
- }
- for($i=0;$i<count($sqlarry);$i++){
- $filename = $this->data_dir.date("ymd",time()).'_part'.$i.'.sql';
- if(!$this->write_sql($filename,$sqlarry[$i])){return false;}
- }
- }
- return true;
- }
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- public function import_sql($dir){
- if($link = opendir($dir)){
- $filearry = scandir($dir);
- $pattern = "_part[0-9]+.sql$|_all.sql$";
- for($i=0;$i<count($filearry);$i++){
- if(eregi($pattern,$filearry[$i])){
- $sqls=file($dir.$filearry[$i]);
- foreach($sqls as $sql){
- str_replace("r","",$sql);
- str_replace("n","",$sql);
- if(!mysql_query(trim($sql))) return false;
- }
- }
- }
- return true;
- }
- }
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- }
应用方法,代码如下:
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