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php爱好者> php教程>php实现mysql数据库备份类

php实现mysql数据库备份类

时间：2021-02-01 来源：互联网

备份程序一共只有两个类：数据库备份器(DbBak)和表备份器(TableBak)：这个程序仅仅备份和恢复数据，使用方法很简单，实例化DbBak，然后调用bakupDb和restoreDb方法：

1、实例化DbBak需要告诉它两件事：数据服务器在哪里($connectid)、备份到哪个目录($backupDir)：

require_once('DbBak.php');

require_once('TableBak.php');

$connectid = mysql_connect('localhost','root','123456');

$backupDir = 'data';

$DbBak = new DbBak($connectid,$backupDir);

2、然后就可以开始备份数据库了，你不仅能够指定备份那个数据库，而且能详细设置只备份那几个表：

2.1如果你想备份mybbs库中的所有表，只要这样：

$DbBak->backupDb('mybbs');

2.2如果你只想备份mybbs库中的board、face、friendlist表，可以用一个一维数组指定：

$DbBak->backupDb('mybbs',array('board','face','friendsite'));

2.3如果只想备份一个表，比如board表：

$DbBak->backupDb('mybbs','board');

3，数据恢复：

对于2.1、2.1、2.3三种情况，只要相应的修改下语句，把backupDb换成restoreDb就能实现数据恢复了：

$DbBak->restoreDb('mybbs');

SQL代码

$DbBak->restoreDb('mybbs',array('board','face','friendsite'));

PHP代码

$DbBak->restoreDb('mybbs','board');

PHP代码

require_once('TableBak.php');

class DbBak {

var $_mysql_link_id;

var $_dataDir;

var $_tableList;

var $_TableBak;

function DbBak($_mysql_link_id,$dataDir)

{

( (!is_string($dataDir)) || strlen($dataDir)==0) && die('error:$datadir is not a string');

!is_dir($dataDir) && mkdir($dataDir);

$this->_dataDir = $dataDir;

$this->_mysql_link_id = $_mysql_link_id;

}

function backupDb($dbName,$tableName=null)

{

( (!is_string($dbName)) || strlen($dbName)==0 ) && die('$dbName must be a string value');

//step1:选择数据库：

mysql_select_db($dbName);

//step2:创建数据库备份目录

$dbDir = $this->_dataDir.DIRECTORY_SEPARATOR.$dbName;

!is_dir($dbDir) && mkdir($dbDir);

//step3:得到数据库所有表名并开始备份表

$this->_TableBak = new TableBak($this->_mysql_link_id,$dbDir);

if(is_null($tableName)){//backup all table in the db

$this->_backupAllTable($dbName);

return;

}

if(is_string($tableName)){

(strlen($tableName)==0) && die('....');

$this->_backupOneTable($dbName,$tableName);

return;

}

if (is_array($tableName)){

foreach ($tableName as $table){

( (!is_string($table)) || strlen($table)==0 ) && die('....');

}

$this->_backupSomeTalbe($dbName,$tableName);

return;

}

function restoreDb($dbName,$tableName=null){

( (!is_string($dbName)) || strlen($dbName)==0 ) && die('$dbName must be a string value');

//step1:检查是否存在数据库并连接：

@mysql_select_db($dbName) || die("the database $dbName dose not exists");

//step2:检查是否存在数据库备份目录

$dbDir = $this->_dataDir.DIRECTORY_SEPARATOR.$dbName;

!is_dir($dbDir) && die("$dbDir not exists");

//step3:start restore

$this->_TableBak = new TableBak($this->_mysql_link_id,$dbDir);

if(is_null($tableName)){//backup all table in the db

$this->_restoreAllTable($dbName);

return;

}

if(is_string($tableName)){

(strlen($tableName)==0) && die('....');

$this->_restoreOneTable($dbName,$tableName);

return;

}

if (is_array($tableName)){

foreach ($tableName as $table){

( (!is_string($table)) || strlen($table)==0 ) && die('....');

}

$this->_restoreSomeTalbe($dbName,$tableName);

return;

}

function _getTableList($dbName)

{

$tableList = array();

$result=mysql_list_tables($dbName,$this->_mysql_link_id);

for ($i = 0; $i < mysql_num_rows($result); $i++){

array_push($tableList,mysql_tablename($result, $i));

}

mysql_free_result($result);

return $tableList;

}

function _backupAllTable($dbName)

{

foreach ($this->_getTableList($dbName) as $tableName){

$this->_TableBak->backupTable($tableName);

}

function _backupOneTable($dbName,$tableName)

{

!in_array($tableName,$this->_getTableList($dbName)) && die("指定的表名$tableName在数据库中不存在");

$this->_TableBak->backupTable($tableName);

}

function _backupSomeTalbe($dbName,$TableNameList)

{

foreach ($TableNameList as $tableName){

!in_array($tableName,$this->_getTableList($dbName)) && die("指定的表名$tableName在数据库中不存在");

}

foreach ($TableNameList as $tableName){

$this->_TableBak->backupTable($tableName);

}

function _restoreAllTable($dbName)

{

//step1:检查是否存在所有数据表的备份文件以及是否可写：

foreach ($this->_getTableList($dbName) as $tableName){

$tableBakFile = $this->_dataDir.DIRECTORY_SEPARATOR

. $dbName.DIRECTORY_SEPARATOR

. $tableName.DIRECTORY_SEPARATOR

. $tableName.'.sql';

!is_writeable ($tableBakFile) && die("$tableBakFile not exists or unwirteable");

}

//step2:start restore

foreach ($this->_getTableList($dbName) as $tableName){

$tableBakFile = $this->_dataDir.DIRECTORY_SEPARATOR

. $dbName.DIRECTORY_SEPARATOR

. $tableName.DIRECTORY_SEPARATOR

. $tableName.'.sql';

$this->_TableBak->restoreTable($tableName,$tableBakFile);

}

function _restoreOneTable($dbName,$tableName)

{

//step1:检查是否存在数据表:

!in_array($tableName,$this->_getTableList($dbName)) && die("指定的表名$tableName在数据库中不存在");

//step2:检查是否存在数据表备份文件以及是否可写：

$tableBakFile = $this->_dataDir.DIRECTORY_SEPARATOR

. $dbName.DIRECTORY_SEPARATOR

. $tableName.DIRECTORY_SEPARATOR

. $tableName.'.sql';

!is_writeable ($tableBakFile) && die("$tableBakFile not exists or unwirteable");

//step3:start restore

$this->_TableBak->restoreTable($tableName,$tableBakFile);

}

function _restoreSomeTalbe($dbName,$TableNameList)

{

//step1:检查是否存在数据表:

foreach ($TableNameList as $tableName){

!in_array($tableName,$this->_getTableList($dbName)) && die("指定的表名$tableName在数据库中不存在");

}

//step2:检查是否存在数据表备份文件以及是否可写：

foreach ($TableNameList as $tableName){

$tableBakFile = $this->_dataDir.DIRECTORY_SEPARATOR

. $dbName.DIRECTORY_SEPARATOR

. $tableName.DIRECTORY_SEPARATOR

. $tableName.'.sql';

!is_writeable ($tableBakFile) && die("$tableBakFile not exists or unwirteable");

}

//step3:start restore:

foreach ($TableNameList as $tableName){

$tableBakFile = $this->_dataDir.DIRECTORY_SEPARATOR

. $dbName.DIRECTORY_SEPARATOR

. $tableName.DIRECTORY_SEPARATOR

. $tableName.'.sql';

$this->_TableBak->restoreTable($tableName,$tableBakFile);

}

代码如下:

<?php

//只有DbBak才能调用这个类

class TableBak{

var $_mysql_link_id;

var $_dbDir;

//private $_DbManager;

function TableBak($mysql_link_id,$dbDir)

{

$this->_mysql_link_id = $mysql_link_id;

$this->_dbDir = $dbDir;

}

function backupTable($tableName)

{

//step1:创建表的备份目录名：

$tableDir = $this->_dbDir.DIRECTORY_SEPARATOR.$tableName;

!is_dir($tableDir) && mkdir($tableDir);

//step2:开始备份：

$this->_backupTable($tableName,$tableDir);

}

function restoreTable($tableName,$tableBakFile)

{

set_time_limit(0);

$fileArray = @file($tableBakFile) or die("can open file $tableBakFile");

$num = count($fileArray);

mysql_unbuffered_query("DELETE FROM $tableName");

$sql = $fileArray[0];

for ($i=1;$i<$num-1;$i++){

mysql_unbuffered_query($sql.$fileArray[$i]) or (die (mysql_error()));

}

return true;

}

function _getFieldInfo($tableName){

$fieldInfo = array();

$sql="SELECT * FROM $tableName LIMIT 1";

$result = mysql_query($sql,$this->_mysql_link_id);

$num_field=mysql_num_fields($result);

for($i=0;$i<$num_field;$i++){

$field_name=mysql_field_name($result,$i);

$field_type=mysql_field_type($result,$i);

$fieldInfo[$field_name] = $field_type;

}

mysql_free_result($result);

return $fieldInfo;

}

function _quoteRow($fieldInfo,$row){

foreach ($row as $field_name=>$field_value){

$field_value=strval($field_value);

switch($fieldInfo[$field_name]){

case "blob": $row[$field_name] = "'".mysql_escape_string($field_value)."'";break;

case "string": $row[$field_name] = "'".mysql_escape_string($field_value)."'";break;

case "date": $row[$field_name] = "'".mysql_escape_string($field_value)."'";break;

case "datetime": $row[$field_name] = "'".mysql_escape_string($field_value)."'";break;

case "time": $row[$field_name] = "'".mysql_escape_string($field_value)."'";break;

case "unknown": $row[$field_name] = "'".mysql_escape_string($field_value)."'";break;

case "int": $row[$field_name] = intval($field_value); break;

case "real": $row[$field_name] = intval($field_value); break;

case "timestamp":$row[$field_name] = intval($field_value); break;

default: $row[$field_name] = intval($field_value); break;

}

return $row;

}

function _backupTable($tableName,$tableDir)

{

//取得表的字段类型：

$fieldInfo = $this->_getFieldInfo($tableName);

//step1:构造INSERT语句前半部分并写入文件：

$fields = array_keys($fieldInfo);

$fields = implode(',',$fields);

$sqltext="INSERT INTO $tableName($fields)VALUES \r\n";

$datafile = $tableDir.DIRECTORY_SEPARATOR.$tableName.'.sql';

(!$handle = fopen($datafile,'w')) && die("can not open file $datafile");

(!fwrite($handle, $sqltext)) && die("can not write data to file $datafile");

fclose($handle);

//step2:取得数据并写入文件：

//取出表资源：

set_time_limit(0);

$sql = "select * from $tableName";

$result = mysql_query($sql,$this->_mysql_link_id);

//打开数据备份文件:$tableName.xml

$datafile = $tableDir.DIRECTORY_SEPARATOR.$tableName.'.sql';

(!$handle = fopen($datafile,'a')) && die("can not open file $datafile");

//逐条取得表记录并写入文件：

while ($row = mysql_fetch_assoc($result)) {

$row = $this->_quoteRow($fieldInfo,$row);

$record='(' . implode(',',$row) . ");\r\n";

(!fwrite($handle, $record)) && die("can not write data to file $datafile");

}

mysql_free_result($result);

//关闭文件：

fclose($handle);

return true;

}

备份mybbs数据库：

SQL代码

//example 1 backup:

require_once('DbBak.php');

require_once('TableBak.php');

$connectid = mysql_connect('localhost','root','123456');

$backupDir = 'data';

$DbBak = new DbBak($connectid,$backupDir);

$DbBak->backupDb('mybbs');

恢复mybbs数据库：

代码如下:

require_once('DbBak.php');

require_once('TableBak.php');

$connectid = mysql_connect('localhost','root','123456');

$backupDir = 'data';

$DbBak = new DbBak($connectid,$backupDir);

$DbBak->restoreDb('mybbs');