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; $i array_push($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);
}
}
}
?>
复制代码 代码如下:
立即学习“PHP免费学习笔记（深入）”；
//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;$imysql_unbuffered_query($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$field_name=mysql_field_name($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：
复制代码 代码如下:
立即学习“PHP免费学习笔记（深入）”；
require_once('DbBak.php');
require_once('TableBak.php');
$connectid = mysql_connect('localhost','root','123456');
$backupDir = 'data';
$DbBak = new DbBak($connectid,$backupDir);
$DbBak->restoreDb('mybbs');
以上就介绍了postgresql数据库 php实现mysql数据库备份类，包括了postgresql数据库方面的内容，希望对PHP教程有兴趣的朋友有所帮助。
