程式師世界 >> 編程語言 >> 網頁編程 >> PHP編程 >> 關於PHP編程 >> php實現mysql數據庫備份類

php實現mysql數據庫備份類

編輯：關於PHP編程

1、實例化DbBak需要告訴它兩件事：數據服務器在哪裡($connectid)、備份到哪個目錄($backupDir)：

require_once('DbBak.php');
require_once('TableBak.php');
$connectid = mysql_connect('localhost','root','123456');
$backupDir = 'data';
$DbBak = new DbBak($connectid,$backupDir);

2、然後就可以開始備份數據庫了，你不僅能夠指定備份那個數據庫，而且能詳細設置只備份那幾個表：
 2.1如果你想備份mybbs庫中的所有表，只要這樣：

$DbBak->backupDb('mybbs');

2.2如果你只想備份mybbs庫中的board、face、friendlist表，可以用一個一維數組指定：

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

2.3如果只想備份一個表，比如board表：
$DbBak->backupDb('mybbs','board');
3，數據恢復：
對於2.1、2.1、2.3三種情況，只要相應的修改下語句，把backupDb換成restoreDb就能實現數據恢復了：

$DbBak->restoreDb('mybbs');
SQL代碼
$DbBak->restoreDb('mybbs',array('board','face','friendsite'));
PHP代碼
$DbBak->restoreDb('mybbs','board');
PHP代碼
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('$dbName must be a string value');
//step1:選擇數據庫：
mysql_select_db($dbName);
//step2:創建數據庫備份目錄
$dbDir = $this->_dataDir.DIRECTORY_SEPARATOR.$dbName;
!is_dir($dbDir) && mkdir($dbDir);
//step3:得到數據庫所有表名並開始備份表
$this->_TableBak = new TableBak($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('$dbName must be a string value');
//step1:檢查是否存在數據庫並連接：
@mysql_select_db($dbName) || die("the database $dbName dose not exists");
//step2:檢查是否存在數據庫備份目錄
$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在數據庫中不存在");
$this->_TableBak->backupTable($tableName);
}

function _backupSomeTalbe($dbName,$TableNameList)
{
foreach ($TableNameList as $tableName){
!in_array($tableName,$this->_getTableList($dbName)) && die("指定的表名$tableName在數據庫中不存在");
}
foreach ($TableNameList as $tableName){
$this->_TableBak->backupTable($tableName);
}
}

function _restoreAllTable($dbName)
{
//step1:檢查是否存在所有數據表的備份文件以及是否可寫：
foreach ($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:檢查是否存在數據表:
!in_array($tableName,$this->_getTableList($dbName)) && die("指定的表名$tableName在數據庫中不存在");
//step2:檢查是否存在數據表備份文件以及是否可寫：
$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,$TableNameList)
{
//step1:檢查是否存在數據表:
foreach ($TableNameList as $tableName){
!in_array($tableName,$this->_getTableList($dbName)) && die("指定的表名$tableName在數據庫中不存在");
}
//step2:檢查是否存在數據表備份文件以及是否可寫：
foreach ($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);
}
}
}
?>
復制代碼代碼如下:
<?php
//只有DbBak才能調用這個類
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:創建表的備份目錄名：
$tableDir = $this->_dbDir.DIRECTORY_SEPARATOR.$tableName;
!is_dir($tableDir) && mkdir($tableDir);
//step2:開始備份：
$this->_backupTable($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)
{
//取得表的字段類型：
$fieldInfo = $this->_getFieldInfo($tableName);

//step1:構造INSERT語句前半部分並寫入文件：
$fields = array_keys($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:取得數據並寫入文件：
//取出表資源：
set_time_limit(0);
$sql = "select * from $tableName";
$result = mysql_query($sql,$this->_mysql_link_id);
//打開數據備份文件:$tableName.xml
$datafile = $tableDir.DIRECTORY_SEPARATOR.$tableName.'.sql';
(!$handle = fopen($datafile,'a')) && die("can not open file $datafile");
//逐條取得表記錄並寫入文件：
while ($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);
//關閉文件：
fclose($handle);

return true;
}

}
?>

備份mybbs數據庫：

SQL代碼
//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');

恢復mybbs數據庫：

復制代碼代碼如下:
require_once('DbBak.php');
require_once('TableBak.php');
$connectid = mysql_connect('localhost','root','123456');
$backupDir = 'data';
$DbBak = new DbBak($connectid,$backupDir);
$DbBak->restoreDb('mybbs');