各类知识收集，PHP技术分享与解决方案各类知识收集，PHP技术分享与解决方案各类知识收集，PHP技术分享与解决方案

Str Tom，为分享PHP技术和解决方案，贡献一份自己的力量！
收藏本站（不迷路），每天更新好文章！
当前位置：首页 > CMS教程 > PHP

postgresql数据库php实现mysql数据库备份类

管理员 2023-09-05
PHP
139

postgresql数据库php实现mysql数据库备份类

内容导读

收集整理的这篇技术教程文章主要介绍了postgresql数据库php实现mysql数据库备份类，小编现在分享给大家，供广大互联网技能从业者学习和参考。文章包含10960字，纯文字阅读大概需要16分钟。

内容图文

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:


//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 rn";
$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) . ");rn";
(!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');

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。

内容总结

以上是为您收集整理的postgresql数据库php实现mysql数据库备份类全部内容，希望文章能够帮你解决postgresql数据库php实现mysql数据库备份类所遇到的程序开发问题。 如果觉得技术教程内容还不错，欢迎将网站推荐给程序员好友。

内容备注

版权声明：本文内容由互联网用户自发贡献，该文观点与技术仅代表作者本人。本站仅提供信息存储空间服务，不拥有所有权，不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容， 请发送邮件至 举报，一经查实，本站将立刻删除。

未经允许不得转载：Str Tom工作室 » postgresql数据库php实现mysql数据库备份类
管理员

如果您对网站的内容有任何想法或意见，请call我！~~

16已赞

相关推荐

文章

更多

扫码关注

qrcode

QQ交谈

回顶部