我从互联网上获得了这个教程。但我甚至对MySQL数据库通过PHP的备份如何工作没有基本的了解。
Using PHP to Backup MySQL Databases
你能推荐一些我可以作为参考的网站，以便我可以研究它吗？
答案 0 :(得分：50)
虽然您可以从PHP执行备份命令，但它们与PHP没有任何关系。这都是关于MySQL的。
我建议使用mysqldump实用程序来备份数据库。可以在此处找到文档：http://dev.mysql.com/doc/refman/5.1/en/mysqldump.html。
mysqldump的基本用法是
mysqldump -u user_name -p name-of-database >file_to_write_to.sql
然后，您可以使用
之类的命令恢复备份mysql -u user_name -p <file_to_read_from.sql
你有权访问cron吗？我建议制作一个运行mysqldump作为cron作业的PHP脚本。这就像是
<?php
$filename='database_backup_'.date('G_a_m_d_y').'.sql';
$result=exec('mysqldump database_name --password=your_pass --user=root --single-transaction >/var/backups/'.$filename,$output);
if($output==''){/* no output is good */}
else {/* we have something to log the output here*/}
如果mysqldump不可用，本文将使用SELECT INTO OUTFILE和LOAD DATA INFILE命令描述另一种方法。与PHP的唯一连接是您使用PHP连接到数据库并执行SQL命令。您也可以从命令行MySQL程序MySQL监视器执行此操作。
这很简单，你用一个命令编写一个SQL文件，并在恢复时加载/执行它。
您可以找到select into outfile here的文档（只需在页面中搜索outfile）。 LOAD DATA INFILE基本上与此相反。有关文档，请参阅here。
答案 1 :(得分：23)
答案 2 :(得分：12)
这是一个纯PHP类，用于在不使用mysqldump或mysql命令的MySQL数据库上执行备份：Backing up MySQL databases with pure PHP
答案 3 :(得分：12)
根据tazo todua提供的良好解决方案，我已经做了一些更改，因为mysql_connect已弃用，并且在新的php版本中不受支持。我已经使用了mysqli_connect来提高了向数据库插入值的性能：
<?php
/**
* Updated: Mohammad M. AlBanna
* Website: MBanna.info
*/
//MySQL server and database
$dbhost = 'localhost';
$dbuser = 'my_user';
$dbpass = 'my_pwd';
$dbname = 'database_name';
$tables = '*';
//Call the core function
backup_tables($dbhost, $dbuser, $dbpass, $dbname, $tables);
//Core function
function backup_tables($host, $user, $pass, $dbname, $tables = '*') {
$link = mysqli_connect($host,$user,$pass, $dbname);
// Check connection
if (mysqli_connect_errno())
{
echo "Failed to connect to MySQL: " . mysqli_connect_error();
exit;
}
mysqli_query($link, "SET NAMES 'utf8'");
//get all of the tables
if($tables == '*')
{
$tables = array();
$result = mysqli_query($link, 'SHOW TABLES');
while($row = mysqli_fetch_row($result))
{
$tables[] = $row[0];
}
}
else
{
$tables = is_array($tables) ? $tables : explode(',',$tables);
}
$return = '';
//cycle through
foreach($tables as $table)
{
$result = mysqli_query($link, 'SELECT * FROM '.$table);
$num_fields = mysqli_num_fields($result);
$num_rows = mysqli_num_rows($result);
$return.= 'DROP TABLE IF EXISTS '.$table.';';
$row2 = mysqli_fetch_row(mysqli_query($link, 'SHOW CREATE TABLE '.$table));
$return.= "\n\n".$row2[1].";\n\n";
$counter = 1;
//Over tables
for ($i = 0; $i < $num_fields; $i++)
{ //Over rows
while($row = mysqli_fetch_row($result))
{
if($counter == 1){
$return.= 'INSERT INTO '.$table.' VALUES(';
} else{
$return.= '(';
}
//Over fields
for($j=0; $j<$num_fields; $j++)
{
$row[$j] = addslashes($row[$j]);
$row[$j] = str_replace("\n","\\n",$row[$j]);
if (isset($row[$j])) { $return.= '"'.$row[$j].'"' ; } else { $return.= '""'; }
if ($j<($num_fields-1)) { $return.= ','; }
}
if($num_rows == $counter){
$return.= ");\n";
} else{
$return.= "),\n";
}
++$counter;
}
}
$return.="\n\n\n";
}
//save file
$fileName = 'db-backup-'.time().'-'.(md5(implode(',',$tables))).'.sql';
$handle = fopen($fileName,'w+');
fwrite($handle,$return);
if(fclose($handle)){
echo "Done, the file name is: ".$fileName;
exit;
}
}
答案 4 :(得分：4)
如果你想从php脚本备份数据库，你可以使用一个类，例如让我们调用它MySQL。这个类将使用PDO（在php类中构建，它将处理与数据库的连接）。这个类看起来像这样：
<?php /*defined in your exampleconfig.php*/
define('DBUSER','root');
define('DBPASS','');
define('SERVERHOST','localhost');
?>
<?php /*defined in examplemyclass.php*/
class MySql{
private $dbc;
private $user;
private $pass;
private $dbname;
private $host;
function __construct($host="localhost", $dbname="your_databse_name_here", $user="your_username", $pass="your_password"){
$this->user = $user;
$this->pass = $pass;
$this->dbname = $dbname;
$this->host = $host;
$opt = array(
PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC
);
try{
$this->dbc = new PDO('mysql:host='.$this->host.';dbname='.$this->dbname.';charset=utf8', $user, $pass, $opt);
}
catch(PDOException $e){
echo $e->getMessage();
echo "There was a problem with connection to db check credenctials";
}
} /*end function*/
public function backup_tables($tables = '*'){ /* backup the db OR just a table */
$host=$this->host;
$user=$this->user;
$pass=$this->pass;
$dbname=$this->dbname;
$data = "";
//get all of the tables
if($tables == '*')
{
$tables = array();
$result = $this->dbc->prepare('SHOW TABLES');
$result->execute();
while($row = $result->fetch(PDO::FETCH_NUM))
{
$tables[] = $row[0];
}
}
else
{
$tables = is_array($tables) ? $tables : explode(',',$tables);
}
//cycle through
foreach($tables as $table)
{
$resultcount = $this->dbc->prepare('SELECT count(*) FROM '.$table);
$resultcount->execute();
$num_fields = $resultcount->fetch(PDO::FETCH_NUM);
$num_fields = $num_fields[0];
$result = $this->dbc->prepare('SELECT * FROM '.$table);
$result->execute();
$data.= 'DROP TABLE '.$table.';';
$result2 = $this->dbc->prepare('SHOW CREATE TABLE '.$table);
$result2->execute();
$row2 = $result2->fetch(PDO::FETCH_NUM);
$data.= "\n\n".$row2[1].";\n\n";
for ($i = 0; $i < $num_fields; $i++)
{
while($row = $result->fetch(PDO::FETCH_NUM))
{
$data.= 'INSERT INTO '.$table.' VALUES(';
for($j=0; $j<$num_fields; $j++)
{
$row[$j] = addslashes($row[$j]);
$row[$j] = str_replace("\n","\\n",$row[$j]);
if (isset($row[$j])) { $data.= '"'.$row[$j].'"' ; } else { $data.= '""'; }
if ($j<($num_fields-1)) { $data.= ','; }
}
$data.= ");\n";
}
}
$data.="\n\n\n";
}
//save filename
$filename = 'db-backup-'.time().'-'.(implode(",",$tables)).'.sql';
$this->writeUTF8filename($filename,$data);
/*USE EXAMPLE
$connection = new MySql(SERVERHOST,"your_db_name",DBUSER, DBPASS);
$connection->backup_tables(); //OR backup_tables("posts");
$connection->closeConnection();
*/
} /*end function*/
private function writeUTF8filename($filenamename,$content){ /* save as utf8 encoding */
$f=fopen($filenamename,"w+");
# Now UTF-8 - Add byte order mark
fwrite($f, pack("CCC",0xef,0xbb,0xbf));
fwrite($f,$content);
fclose($f);
/*USE EXAMPLE this is only used by public function above...
$this->writeUTF8filename($filename,$data);
*/
} /*end function*/
public function recoverDB($file_to_load){
echo "write some code to load and proccedd .sql file in here ...";
/*USE EXAMPLE this is only used by public function above...
recoverDB("some_buck_up_file.sql");
*/
} /*end function*/
public function closeConnection(){
$this->dbc = null;
//EXAMPLE OF USE
/*$connection->closeConnection();*/
}/*end function*/
} /*END OF CLASS*/
?>
现在你可以在backup.php中使用它：
include ('config.php');
include ('myclass.php');
$connection = new MySql(SERVERHOST,"your_databse_name_here",DBUSER, DBPASS);
$connection->backup_tables(); /*Save all tables and it values in selected database*/
$connection->backup_tables("post_table"); /*Saves only table name posts_table from selected database*/
$connection->closeConnection();
这意味着访问此页面将导致备份您的文件...当然不一定是这样:)您可以在数据库的每个帖子上调用此方法以使其保持最新状态但是，我建议将它一直写入一个文件，而不是使用time（）创建新文件......如上所述。
希望它有所帮助，祝你好运！产品：＆gt;
答案 5 :(得分：1)
答案 6 :(得分：1)
看看here！它是用PHP编写的本机解决方案。你不需要执行mysqldump，或者处理不完整的脚本。这是一个完整的mysqldump克隆，没有依赖关系，输出压缩和合理的默认值。
开箱即用，mysqldump-php支持备份表结构，数据本身，视图，触发器和事件。
MySQLDump-PHP是唯一支持的库：
你可以使用composer安装它，或者只是下载php文件，它就像这样简单：
use Ifsnop\Mysqldump as IMysqldump;
try {
$dump = new IMysqldump\Mysqldump('database', 'username', 'password');
$dump->start('storage/work/dump.sql');
} catch (\Exception $e) {
echo 'mysqldump-php error: ' . $e->getMessage();
}
所有选项都在github页面上解释，但或多或少都是自动解释的：
$dumpSettingsDefault = array(
'include-tables' => array(),
'exclude-tables' => array(),
'compress' => Mysqldump::NONE,
'init_commands' => array(),
'no-data' => array(),
'reset-auto-increment' => false,
'add-drop-database' => false,
'add-drop-table' => false,
'add-drop-trigger' => true,
'add-locks' => true,
'complete-insert' => false,
'databases' => false,
'default-character-set' => Mysqldump::UTF8,
'disable-keys' => true,
'extended-insert' => true,
'events' => false,
'hex-blob' => true, /* faster than escaped content */
'net_buffer_length' => self::MAXLINESIZE,
'no-autocommit' => true,
'no-create-info' => false,
'lock-tables' => true,
'routines' => false,
'single-transaction' => true,
'skip-triggers' => false,
'skip-tz-utc' => false,
'skip-comments' => false,
'skip-dump-date' => false,
'skip-definer' => false,
'where' => '',
/* deprecated */
'disable-foreign-keys-check' => true
);
答案 7 :(得分：1)
从@DevWL的答案中，我在
处收到“未定义的偏移量...”。if ($j<($num_fields-1)) { $data.= ','; }
我对以下内容进行了一些更改：
class DBbackup {
public $suffix;
public $dirs;
protected $dbInstance;
public function __construct() {
try{
$this->dbInstance = new PDO("mysql:host=".$dbhost.";dbname=".$dbname,
$username, $password);
} catch(Exception $e) {
die("Error ".$e->getMessage());
}
$this->suffix = date('Ymd_His');
}
public function backup($tables = '*'){
$output = "-- database backup - ".date('Y-m-d H:i:s').PHP_EOL;
$output .= "SET NAMES utf8;".PHP_EOL;
$output .= "SET sql_mode = 'NO_AUTO_VALUE_ON_ZERO';".PHP_EOL;
$output .= "SET foreign_key_checks = 0;".PHP_EOL;
$output .= "SET AUTOCOMMIT = 0;".PHP_EOL;
$output .= "START TRANSACTION;".PHP_EOL;
//get all table names
if($tables == '*') {
$tables = [];
$query = $this->dbInstance->prepare('SHOW TABLES');
$query->execute();
while($row = $query->fetch(PDO::FETCH_NUM)) {
$tables[] = $row[0];
}
$query->closeCursor();
}
else {
$tables = is_array($tables) ? $tables : explode(',',$tables);
}
foreach($tables as $table) {
$query = $this->dbInstance->prepare("SELECT * FROM `$table`");
$query->execute();
$output .= "DROP TABLE IF EXISTS `$table`;".PHP_EOL;
$query2 = $this->dbInstance->prepare("SHOW CREATE TABLE `$table`");
$query2->execute();
$row2 = $query2->fetch(PDO::FETCH_NUM);
$query2->closeCursor();
$output .= PHP_EOL.$row2[1].";".PHP_EOL;
while($row = $query->fetch(PDO::FETCH_NUM)) {
$output .= "INSERT INTO `$table` VALUES(";
for($j=0; $j<count($row); $j++) {
$row[$j] = addslashes($row[$j]);
$row[$j] = str_replace("\n","\\n",$row[$j]);
if (isset($row[$j]))
$output .= "'".$row[$j]."'";
else $output .= "''";
if ($j<(count($row)-1))
$output .= ',';
}
$output .= ");".PHP_EOL;
}
}
$output .= PHP_EOL.PHP_EOL;
$output .= "COMMIT;";
//save filename
$filename = 'db_backup_'.$this->suffix.'.sql';
$this->writeUTF8filename($filename,$output);
}
private function writeUTF8filename($fn,$c){ /* save as utf8 encoding */
$f=fopen($fn,"w+");
# Now UTF-8 - Add byte order mark
fwrite($f, pack("CCC",0xef,0xbb,0xbf));
fwrite($f,$c);
fclose($f);
}
}
和用法示例：
$Backup = new DBbackup();
$Backup->backup();
这在MySQL 10.1.34-MariaDB和PHP：7.2.7上很好用
答案 8 :(得分：0)
在“dbBackup”文件夹/目录
中备份数据库的解决方案<?php
error_reporting(E_ALL);
/* Define database parameters here */
define("DB_USER", 'root');
define("DB_PASSWORD", '');
define("DB_NAME", 'YOUR_DATABASE _NAME');
define("DB_HOST", 'localhost');
define("OUTPUT_DIR", 'dbBackup'); // Folder / Directory Name
define("TABLES", '*');
/* Instantiate Backup_Database and perform backup */
$backupDatabase = new Backup_Database(DB_HOST, DB_USER, DB_PASSWORD, DB_NAME);
$status = $backupDatabase->backupTables(TABLES, OUTPUT_DIR) ? 'OK' : 'KO';
echo "Backup result: " . $status . " - By Irshad Khan";
/* The Backup_Database class */
class Backup_Database {
/* Host where database is located */
var $host = 'localhost';
var $username = 'root';
var $passwd = '';
var $dbName = 'YOUR_DATABASE _NAME';
var $charset = '';
/* Constructor initializes database */
function Backup_Database($host, $username, $passwd, $dbName, $charset = 'utf8') {
$this->host = $host;
$this->username = $username;
$this->passwd = $passwd;
$this->dbName = $dbName;
$this->charset = $charset;
$this->initializeDatabase();
}
protected function initializeDatabase() {
$conn = @mysql_connect($this->host, $this->username, $this->passwd); // Ik Added @ to Hide PDO Error Message
mysql_select_db($this->dbName, $conn);
if (!mysql_set_charset($this->charset, $conn)) {
mysql_query('SET NAMES ' . $this->charset);
}
}
/* Backup the whole database or just some tables Use '*' for whole database or 'table1 table2 table3...' @param string $tables */
public function backupTables($tables = '*', $outputDir = '.') {
try {
/* Tables to export */
if ($tables == '*') {
$tables = array();
$result = mysql_query('SHOW TABLES');
while ($row = mysql_fetch_row($result)) {
$tables[] = $row[0];
}
} else {
$tables = is_array($tables) ? $tables : explode(',', $tables);
}
$sql = 'CREATE DATABASE IF NOT EXISTS ' . $this->dbName . ";\n\n";
$sql .= 'USE ' . $this->dbName . ";\n\n";
/* Iterate tables */
foreach ($tables as $table) {
echo "Backing up " . $table . " table...";
$result = mysql_query('SELECT * FROM ' . $table);
$numFields = mysql_num_fields($result);
$sql .= 'DROP TABLE IF EXISTS ' . $table . ';';
$row2 = mysql_fetch_row(mysql_query('SHOW CREATE TABLE ' . $table));
$sql.= "\n\n" . $row2[1] . ";\n\n";
for ($i = 0; $i < $numFields; $i++) {
while ($row = mysql_fetch_row($result)) {
$sql .= 'INSERT INTO ' . $table . ' VALUES(';
for ($j = 0; $j < $numFields; $j++) {
$row[$j] = addslashes($row[$j]);
// $row[$j] = ereg_replace("\n", "\\n", $row[$j]);
if (isset($row[$j])) {
$sql .= '"' . $row[$j] . '"';
} else {
$sql.= '""';
}
if ($j < ($numFields - 1)) {
$sql .= ',';
}
}
$sql.= ");\n";
}
}
$sql.="\n\n\n";
echo " OK <br/><br/>" . "";
}
} catch (Exception $e) {
var_dump($e->getMessage());
return false;
}
return $this->saveFile($sql, $outputDir);
}
/* Save SQL to file @param string $sql */
protected function saveFile(&$sql, $outputDir = '.') {
if (!$sql)
return false;
try {
$handle = fopen($outputDir . '/db-backup-' . $this->dbName . '-' . date("Ymd-His", time()) . '.sql', 'w+');
fwrite($handle, $sql);
fclose($handle);
} catch (Exception $e) {
var_dump($e->getMessage());
return false;
}
return true;
}
}
?>
答案 9 :(得分：0)
使用Cron Job，下面是php函数
protected override void OnStartup(StartupEventArgs e)
{
base.OnStartup(e);
_notifyIcon = new NotifyIcon();
_notifyIcon.DoubleClick += (sender, args) => ShowMainWindow();
_notifyIcon.Icon = Wpf.Properties.Resources.QDrive;
_notifyIcon.Visible = true;
CreateContextMenu();
new Bootstrapper().Run();
Debug.Assert(Current.MainWindow != null, "Application.Current.MainWindow != null");
Current.MainWindow.Closing += MainWindowOnClosing;
}
private void CreateContextMenu()
{
_notifyIcon.ContextMenuStrip = new ContextMenuStrip();
_notifyIcon.ContextMenuStrip.Items.Add("Open Q-Drive...").Click += (sender, args) => ShowMainWindow();
_notifyIcon.ContextMenuStrip.Items.Add("Exit").Click += (sender, args) => ExitApplication();
}
private void ExitApplication()
{
_isExit = true;
Debug.Assert(Current.MainWindow != null, "Application.Current.MainWindow != null");
Current.MainWindow.Close();
_notifyIcon.Visible = false;
_notifyIcon.Dispose();
_notifyIcon = null;
}
-u和username之间不应该有空格，-p和密码之间也没有空格。 CRON JOB命令在每个星期天上午8点30分运行此脚本：
public function runback() {
$filename = '/var/www/html/local/storage/stores/database_backup_' . date("Y-m-d-H-i-s") . '.sql';
/*
* db backup
*/
$command = "mysqldump --single-transaction -h $dbhost -u$dbuser -p$dbpass yourdb_name > $filename";
system($command);
if ($command == '') {
/* no output is good */
echo 'not done';
} else {
/* we have something to log the output here */
echo 'done';
}
}
答案 10 :(得分：0)
@ T.Todua的答案。
这个很酷。但是，它无法正确备份我的数据库。因此，我对其进行了修改。
请这样使用：Backup_Mysql_Db::init("localhost","user","pass","db_name","/usr/var/output_dir" );
谢谢。
<?php
/**========================================================+
* +
* Static class with functions for backing up database. +
* +
* PHP Version 5.6.31 +
*=========================================================+*/
class Backup_Mysql_Db
{
private function __construct() {}
/**Initializes the database backup
* @param String $host mysql hostname
* @param String $user mysql user
* @param String $pass mysql password
* @param String $name name of database
* @param String $outputDir the path to the output directory for storing the backup file
* @param Array $tables (optional) to backup specific tables only,like: array("mytable1","mytable2",...)
* @param String $backup_name (optional) backup filename (otherwise, it creates random name)
* EXAMPLE: Backup_Mysql_Db::init("localhost","user","pass","db_name","/usr/var/output_dir" );
*/
public static function init($host,$user,$pass,$name, $outputDir, $tables=false, $backup_name=false)
{
set_time_limit(3000);
$mysqli = new mysqli($host,$user,$pass,$name);
/* check connection */
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
//change database to $name
$mysqli->select_db($name);
/* change character set to utf8 */
if (!$mysqli->set_charset("utf8"))
{
printf("Error loading character set utf8: %s\n", $mysqli->error);
exit();
}
//list all tables in the database
$queryTables = $mysqli->query('SHOW TABLES');
while($row = $queryTables->fetch_row())
{
$target_tables[] = $row[0];
}
//if user opted to backup specific tables only
if($tables !== false)
{
$target_tables = array_intersect( $target_tables, $tables);
}
date_default_timezone_set('Africa/Accra');//set your timezone
//$content is the text data to be written to the file for backup
$content = "-- phpMyAdmin SQL Dump\r\n-- version 4.7.4". //insert your phpMyAdmin version
"\r\n-- https://www.phpmyadmin.net/\r\n--\r\n-- Host: ".$host.
"\r\n-- Generation Time: ".date('M d, Y \a\t h:i A',strtotime(date('Y-m-d H:i:s', time()))).
"\r\n-- Server version: ".$mysqli->server_info.
"\r\n-- PHP Version: ". phpversion();
$content .= "\r\n\r\nSET SQL_MODE = \"NO_AUTO_VALUE_ON_ZERO\";\r\nSET AUTOCOMMIT = 0;\r\nSTART TRANSACTION;\r\nSET time_zone = \"+00:00\";\r\n\r\n\r\n/*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */;\r\n/*!40101 SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS */;\r\n/*!40101 SET @OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION */;\r\n/*!40101 SET NAMES utf8mb4 */;\r\n\r\n--\r\n-- Database: `".
$name."`\r\n--\r\nCREATE DATABASE IF NOT EXISTS `".
$name."` DEFAULT CHARACTER SET latin1 COLLATE latin1_swedish_ci;\r\nUSE `".
$name."`;";
//traverse through every table in the database
foreach($target_tables as $table)
{
if (empty($table)){ continue; }
$result = $mysqli->query('SELECT * FROM `'.$table.'`');
//get the number of columns
$fields_amount=$result->field_count;
//get the number of affected rows in the MySQL operation
$rows_num=$mysqli->affected_rows;
//Retrieve the Table Definition of the existing table
$res = $mysqli->query('SHOW CREATE TABLE '.$table);
$TableMLine=$res->fetch_row();
$content .= "\r\n\r\n-- --------------------------------------------------------\r\n\r\n"."--\r\n-- Table structure for table `".$table."`\r\n--\r\n\r\n";
//if the table is not empty
if(!self::table_is_empty($table,$mysqli))
{ $content .= $TableMLine[1].";\n\n";//append the Table Definition
//replace, case insensitively
$content =str_ireplace("CREATE TABLE `".$table."`",//wherever you find this
"DROP TABLE IF EXISTS `".$table."`;\r\nCREATE TABLE IF NOT EXISTS `".$table."`",//replace with that
$content);//in this
$content .= "--\r\n-- Dumping data for table `".$table."`\r\n--\r\n";
$content .= "\nINSERT INTO `".$table."` (".self::get_columns_from_table($table, $mysqli)." ) VALUES\r\n".self::get_values_from_table($table,$mysqli);
}
else//otherwise if the table is empty
{
$content .= $TableMLine[1].";";
//replace, case insensitively
$content =str_ireplace("CREATE TABLE `".$table."`",//wherever you find this
"DROP TABLE IF EXISTS `".$table."`;\r\nCREATE TABLE IF NOT EXISTS `".$table."`",//replace with that
$content);//in this
}
}
$content .= "\r\n\r\n/*!40101 SET CHARACTER_SET_CLIENT=@OLD_CHARACTER_SET_CLIENT */;\r\n/*!40101 SET CHARACTER_SET_RESULTS=@OLD_CHARACTER_SET_RESULTS */;\r\n/*!40101 SET COLLATION_CONNECTION=@OLD_COLLATION_CONNECTION */;";
date_default_timezone_set('Africa/Accra');
//format the time at this very moment and get rid of the colon ( windows doesn't allow colons in filenames)
$date = str_replace(":", "-", date('jS M, y. h:i:s A.',strtotime(date('Y-m-d H:i:s', time()))));
//if there's a backup name, use it , otherwise device one
$backup_name = $backup_name ? $backup_name : $name.'___('.$date.').sql';
//Get current buffer contents and delete current output buffer
ob_get_clean();
self::saveFile($content, $backup_name, $outputDir);
exit;
}
/** Save data to file.
* @param String $data The text data to be stored in the file
* @param String $backup_name The name of the backup file
* @param String $outputDir (optional) The directory to save the file to.
* If unspecified, will save in the current directory.
* */
private static function saveFile(&$data,$backup_name, $outputDir = '.')
{
if (!$data)
{
return false;
}
try
{
$handle = fopen($outputDir . '/'. $backup_name , 'w+');
fwrite($handle, $data);
fclose($handle);
} catch (Exception $e)
{
var_dump($e->getMessage());
return false;
}
return true;
}
/**Checks if table is empty
* @param String $table table in mysql database
* @return Boolean true if table is empty, false otherwise
*/
private static function table_is_empty($table,$mysqli)
{
$sql = "SELECT * FROM $table";
$result = mysqli_query($mysqli, $sql);
if($result)
{
if(mysqli_num_rows($result) > 0)
{
return false;
}
else
{
return true;
}
}
return false;
}
/**Retrieves the columns in the table
* @param String $table table in mysql database
* @return String a list of all the columns in the right format
*/
private static function get_columns_from_table($table, $mysqli)
{
$column_header = "";
$result = mysqli_query($mysqli, "SHOW COLUMNS FROM $table");
while($row = $result->fetch_row())
{
$column_header .= "`".$row[0]."`, ";
}
//remove leading and trailing whitespace, and remove the last comma in the string
return rtrim(trim($column_header),',');
}
/**Retrieves the values in the table row by row in the table
* @param String $table table in mysql database
* @return String a list of all the values in the table in the right format
*/
private static function get_values_from_table($table, $mysqli)
{
$values = "";
$columns = [];
//get all the columns in the table
$result = mysqli_query($mysqli, "SHOW COLUMNS FROM $table");
while($row = $result->fetch_row())
{
array_push($columns,$row[0] );
}
$result1 = mysqli_query($mysqli, "SELECT * FROM $table");
//while traversing every row in the table(row by row)
while($row = mysqli_fetch_array($result1))
{ $values .= "(";
//get the values in each column
foreach($columns as $col)
{ //if the value is an Integer
$values .= (self::column_is_of_int_type($table, $col,$mysqli)?
$row["$col"].", "://do not surround it with single quotes
"'".$row["$col"]."', "); //otherwise, surround it with single quotes
}
$values = rtrim(trim($values),','). "),\r\n";
}
return rtrim(trim($values),',').";";
}
/**Checks if the data type in the column is an integer
* @param String $table table in mysql database
* @return Boolean true if it is an integer, false otherwise.
*/
private static function column_is_of_int_type($table, $column,$mysqli)
{
$q = mysqli_query($mysqli,"DESCRIBE $table");
while($row = mysqli_fetch_array($q))
{
if ($column === "{$row['Field']}")
{
if (strpos("{$row['Type']}", 'int') !== false)
{
return true;
}
}
}
return false;
}
}
答案 11 :(得分：0)
尝试此100％正常工作。
<?php
function dbbackup($host,$user,$pass,$name,$tables=false, $backup_name=false)
{
set_time_limit(3000);
$mysqli = new mysqli($host,$user,$pass,$name);
$mysqli->select_db($name);
$mysqli->query("SET NAMES 'utf8'");
$queryTables = $mysqli->query('SHOW TABLES');
while($row = $queryTables->fetch_row())
{
$target_tables[] = $row[0];
}
if($tables !== false)
{
$target_tables = array_intersect( $target_tables, $tables);
}
$content = "SET SQL_MODE = \"NO_AUTO_VALUE_ON_ZERO\";\r\nSET time_zone = \"+00:00\";\r\n\r\n\r\n/*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */;\r\n/*!40101 SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS */;\r\n/*!40101 SET @OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION */;\r\n/*!40101 SET NAMES utf8 */;\r\n--\r\n-- Database: `".$name."`\r\n--\r\n\r\n\r\n";
foreach($target_tables as $table)
{
if (empty($table))
{
continue;
}
$result = $mysqli->query('SELECT * FROM `'.$table.'`'); $fields_amount=$result->field_count; $rows_num=$mysqli->affected_rows; $res = $mysqli->query('SHOW CREATE TABLE '.$table); $TableMLine=$res->fetch_row();
$content .= "\n\n".$TableMLine[1].";\n\n"; $TableMLine[1]=str_ireplace('CREATE TABLE `','CREATE TABLE IF NOT EXISTS `',$TableMLine[1]);
for ($i = 0, $st_counter = 0; $i < $fields_amount; $i++, $st_counter=0)
{
while($row = $result->fetch_row())
{
if ($st_counter%100 == 0 || $st_counter == 0 )
{
$content .= "\nINSERT INTO ".$table." VALUES";
}
$content .= "\n(";
for($j=0; $j<$fields_amount; $j++)
{
$row[$j] = str_replace("\n","\\n", addslashes($row[$j]) );
if (isset($row[$j]))
{
$content .= '"'.$row[$j].'"' ;
}
else
{
$content .= '""';
}
if ($j<($fields_amount-1))
{
$content.= ',';
}
}
$content .=")";
if ( (($st_counter+1)%100==0 && $st_counter!=0) || $st_counter+1==$rows_num)
{
$content .= ";";
}
else
{
$content .= ",";
}
$st_counter=$st_counter+1;
}
} $content .="\n\n\n";
}
$content .= "\r\n\r\n/*!40101 SET CHARACTER_SET_CLIENT=@OLD_CHARACTER_SET_CLIENT */;\r\n/*!40101 SET CHARACTER_SET_RESULTS=@OLD_CHARACTER_SET_RESULTS */;\r\n/*!40101 SET COLLATION_CONNECTION=@OLD_COLLATION_CONNECTION */;";
$backup_name = $backup_name ? $backup_name : $name.'___('.date('H-i-s').'_'.date('d-m-Y').').sql';
ob_get_clean();
header('Content-Type: application/octet-stream');
header("Content-Transfer-Encoding: Binary");
header('Content-Length: '. (function_exists('mb_strlen') ? mb_strlen($content, '8bit'): strlen($content)) );
header("Content-disposition: attachment; filename=\"".$backup_name."\"");
echo $content; exit;
}
dbbackup("host", "user", "password", "database" );
?>
答案 12 :(得分：0)
尝试以下使用SELECT INTO OUTFILE查询创建表备份的示例。这只会备份特定的表。
<?php
$dbhost = 'localhost:3036';
$dbuser = 'root';
$dbpass = 'rootpassword';
$conn = mysql_connect($dbhost, $dbuser, $dbpass);
if(! $conn ) {
die('Could not connect: ' . mysql_error());
}
$table_name = "employee";
$backup_file = "/tmp/employee.sql";
$sql = "SELECT * INTO OUTFILE '$backup_file' FROM $table_name";
mysql_select_db('test_db');
$retval = mysql_query( $sql, $conn );
if(! $retval ) {
die('Could not take data backup: ' . mysql_error());
}
echo "Backedup data successfully\n";
mysql_close($conn);
?>