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PHP实现MySQL数据库备份的源码
时间：2022-06-24 17:48:40 编辑：袖梨 来源：一聚教程网
下面是一个php数据库备份的源代码，大家也可以根据自己的需求进行修改。
// 备份数据库
$host = "localhost";
$user = "root"; //数据库账号
$password = ""; //数据库密码
$dbname = "mysql"; //数据库名称
// 这里的账号、密码、名称都是从页面传过来的
if (!mysql_connect($host, $user, $password)) // 连接mysql数据库
{
echo '数据库连接失败，请核对后再试';
exit;
}
if (!mysql_select_db($dbname)) // 是否存在该数据库
{
echo '不存在数据库:' . $dbname . ',请核对后再试';
exit;
}
mysql_query("set names 'utf8'");
$mysql = "set charset utf8;rn";
$q1 = mysql_query("show tables");
while ($t = mysql_fetch_array($q1))
{
$table = $t[0];
$q2 = mysql_query("show create table `$table`");
$sql = mysql_fetch_array($q2);
$mysql .= $sql['Create Table'] . ";rn";
$q3 = mysql_query("select * from `$table`");
while ($data = mysql_fetch_assoc($q3))
{
$keys = array_keys($data);
$keys = array_map('addslashes', $keys);
$keys = join('`,`', $keys);
$keys = "`" . $keys . "`";
$vals = array_values($data);
$vals = array_map('addslashes', $vals);
$vals = join("','", $vals);
$vals = "'" . $vals . "'";
$mysql .= "insert into `$table`($keys) values($vals);rn";
}
}
$filename = $dbname . date('Ymjgi') . ".sql"; //存放路径，默认存放到项目最外层
$fp = fopen($filename, 'w');
fputs($fp, $mysql);
fclose($fp);
echo "数据备份成功";
?>
如果使用的是thinkphp可以使用下面代码来备份mysql数据库
// www.111com.net
class BaksqlAction extends CommonAction {
public $config = ''; //相关配置
public $model = ''; //实例化一个model
public $content; //内容
public $dbName = ''; //数据库名
public $dir_sep = '/'; //路径符号
//初始化数据
function _initialize() {
parent::_initialize();
header("Content-type: text/html;charset=utf-8");
set_time_limit(0); //不超时
ini_set('memory_limit','500M');
$this->config = array(
'path' => C('DB_BACKUP'), //备份文件存在哪里
'isCompress' => 0, //是否开启gzip压缩 【未测试】
'isDownload' => 0 //备份完成后是否下载文件 【未测试】
);
$this->dbName = C('DB_NAME'); //当前数据库名称
$this->model = new Model();
//$sql = 'set interactive_timeout=24*3600'; //空闲多少秒后 断开链接
//$this->model>execute($sql);
}
/* -
* +------------------------------------------------------------------------
* * @ 已备份数据列表
* +------------------------------------------------------------------------
*/
function index() {
$path = $this->config['path'];
$fileArr = $this->MyScandir($path);
foreach ($fileArr as $key => $value) {
if ($key > 1) {
//获取文件创建时间
$fileTime = date('Y-m-d H:i:s', filemtime($path . '/' . $value));
$fileSize = filesize($path . '/' . $value) / 1024;
//获取文件大小
$fileSize = $fileSize < 1024 ? number_format($fileSize, 2) . ' KB' :
number_format($fileSize / 1024, 2) . ' MB';
//构建列表数组
$list[] = array(
'name' => $value,
'time' => $fileTime,
'size' => $fileSize
);
}
}
$this->assign('list', $list);
$this->display();
}
/* -
* +------------------------------------------------------------------------
* * @ 获取数据表
* +------------------------------------------------------------------------
*/
function tablist() {
$list = $this->model->query("SHOW TABLE STATUS FROM {$this->dbName}"); //得到表的信息
//echo $Backup->getLastSql();
$this->assign('list', $list);
$this->display();
}
/* -
* +------------------------------------------------------------------------
* * @ 备份整个数据库
* +------------------------------------------------------------------------
*/
function backall() {
$tables = $this->getTables();
if ($this->backup($tables)) {
$this->success('数据库备份成功！', '/public/ok');
} else {
$this->error('数据库备份失败！');
}
}
/* -
* +------------------------------------------------------------------------
* * @ 按表备份，可批量
* +------------------------------------------------------------------------
*/
function backtables() {
$tab = $_REQUEST['tab'];
if (is_array($tab))
$tables = $tab;
else
$tables[] = $tab;
if ($this->backup($tables)) {
if (is_array($tab))
$this->success('数据库备份成功！');
else
$this->success('数据库备份成功！', '/public/ok');
} else {
$this->error('数据库备份失败！');
}
}
//还原数据库
function recover() {
if ($this->recover_file($_GET['file'])) {
$this->success('数据还原成功！', '/public/ok');
} else {
$this->error('数据还原失败！');
}
}
//删除数据备份
function deletebak() {
if (unlink($this->config['path'] . $this->dir_sep . $_GET['file'])) {
$this->success('删除备份成功！', '/public/ok');
} else {
$this->error('删除备份失败！');
}
}
/* -
* +------------------------------------------------------------------------
* * @ 下载备份文件
* +------------------------------------------------------------------------
*/
function downloadBak() {
$file_name = $_GET['file'];
$file_dir = $this->config['path'];
if (!file_exists($file_dir . "/" . $file_name)) { //检查文件是否存在
return false;
exit;
} else {
$file = fopen($file_dir . "/" . $file_name, "r"); // 打开文件
// 输入文件标签
header('Content-Encoding: none');
header("Content-type: application/octet-stream");
header("Accept-Ranges: bytes");
header("Accept-Length: " . filesize($file_dir . "/" . $file_name));
header('Content-Transfer-Encoding: binary');
header("Content-Disposition: attachment; filename=" . $file_name); //以真实文件名提供给浏览器下载
header('Pragma: no-cache');
header('Expires: 0');
//输出文件内容
echo fread($file, filesize($file_dir . "/" . $file_name));
fclose($file);
exit;
}
}
/* -
* +------------------------------------------------------------------------
* * @ 获取 目录下文件数组
* +------------------------------------------------------------------------
* * @ $FilePath 目录路径
* * @ $Order 排序
* +------------------------------------------------------------------------
* * @ 获取指定目录下的文件列表，返回数组
* +------------------------------------------------------------------------
*/
private function MyScandir($FilePath = './', $Order = 0) {
$FilePath = opendir($FilePath);
while ($filename = readdir($FilePath)) {
$fileArr[] = $filename;
}
$Order == 0 ? sort($fileArr) : rsort($fileArr);
return $fileArr;
}
/* * ******************************************************************************************** */
/* -
* +------------------------------------------------------------------------
* * @ 读取备份文件
* +------------------------------------------------------------------------
* * @ $fileName 文件名
* +------------------------------------------------------------------------
*/
private function getFile($fileName) {
$this->content = '';
$fileName = $this->trimPath($this->config['path'] . $this->dir_sep . $fileName);
if (is_file($fileName)) {
$ext = strrchr($fileName, '.');
if ($ext == '.sql') {
$this->content = file_get_contents($fileName);
} elseif ($ext == '.gz') {
$this->content = implode('', gzfile($fileName));
} else {
$this->error('无法识别的文件格式!');
}
} else {
$this->error('文件不存在!');
}
}
/* -
* +------------------------------------------------------------------------
* * @ 把数据写入磁盘
* +------------------------------------------------------------------------
*/
private function setFile() {
$recognize = '';
$recognize = $this->dbName;
$fileName = $this->trimPath($this->config['path'] . $this->dir_sep . $recognize . '_' . date('YmdHis') . '_' . mt_rand(100000000, 999999999) . '.sql');
$path = $this->setPath($fileName);
if ($path !== true) {
$this->error("无法创建备份目录目录 '$path'");
}
if ($this->config['isCompress'] == 0) {
if (!file_put_contents($fileName, $this->content, LOCK_EX)) {
$this->error('写入文件失败,请检查磁盘空间或者权限!');
}
} else {
if (function_exists('gzwrite')) {
$fileName .= '.gz';
if ($gz = gzopen($fileName, 'wb')) {
gzwrite($gz, $this->content);
gzclose($gz);
} else {
$this->error('写入文件失败,请检查磁盘空间或者权限!');
}
} else {
$this->error('没有开启gzip扩展!');
}
}
if ($this->config['isDownload']) {
$this->downloadFile($fileName);
}
}
private function trimPath($path) {
return str_replace(array('/', '\', '//', '\\'), $this->dir_sep, $path);
}
private function setPath($fileName) {
$dirs = explode($this->dir_sep, dirname($fileName));
$tmp = '';
foreach ($dirs as $dir) {
$tmp .= $dir . $this->dir_sep;
if (!file_exists($tmp) && !@mkdir($tmp, 0777))
return $tmp;
}
return true;
}
//未测试
private function downloadFile($fileName) {
ob_end_clean();
header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
header('Content-Description: File Transfer');
header('Content-Type: application/octet-stream');
header('Content-Length: ' . filesize($fileName));
header('Content-Disposition: attachment; filename=' . basename($fileName));
readfile($fileName);
}
/* -
* +------------------------------------------------------------------------
* * @ 给字符串添加 ` `
* +------------------------------------------------------------------------
* * @ $str 字符串
* +------------------------------------------------------------------------
* * @ 返回 `$str`
* +------------------------------------------------------------------------
*/
private function backquote($str) {
return "`{$str}`";
}
/* -
* +------------------------------------------------------------------------
* * @ 获取数据库的所有表
* +------------------------------------------------------------------------
* * @ $dbName 数据库名称
* +------------------------------------------------------------------------
*/
private function getTables($dbName = '') {
if (!empty($dbName)) {
$sql = 'SHOW TABLES FROM ' . $dbName;
} else {
$sql = 'SHOW TABLES ';
}
$result = $this->model->query($sql);
$info = array();
foreach ($result as $key => $val) {
$info[$key] = current($val);
}
return $info;
}
/* -
* +------------------------------------------------------------------------
* * @ 把传过来的数据 按指定长度分割成数组
* +------------------------------------------------------------------------
* * @ $array 要分割的数据
* * @ $byte 要分割的长度
* +------------------------------------------------------------------------
* * @ 把数组按指定长度分割,并返回分割后的数组
* +------------------------------------------------------------------------
*/
private function chunkArrayByByte($array, $byte = 5120) {
$i = 0;
$sum = 0;
$return = array();
foreach ($array as $v) {
$sum += strlen($v);
if ($sum < $byte) {
$return[$i][] = $v;
} elseif ($sum == $byte) {
$return[++$i][] = $v;
$sum = 0;
} else {
$return[++$i][] = $v;
$i++;
$sum = 0;
}
}
return $return;
}
/* -
* +------------------------------------------------------------------------
* * @ 备份数据 { 备份每张表、视图及数据 }
* +------------------------------------------------------------------------
* * @ $tables 需要备份的表数组
* +------------------------------------------------------------------------
*/
private function backup($tables) {
if (empty($tables))
$this->error('没有需要备份的数据表!');
$this->content = '/* This file is created by MySQLReback ' . date('Y-m-d H:i:s') . ' */';
foreach ($tables as $i => $table) {
$table = $this->backquote($table); //为表名增加 ``
$tableRs = $this->model->query("SHOW CREATE TABLE {$table}"); //获取当前表的创建语句
if (!empty($tableRs[0]["Create View"])) {
$this->content .= "rn /* 创建视图结构 {$table} */";
$this->content .= "rn DROP VIEW IF EXISTS {$table};/* MySQLReback Separation */ " . $tableRs[0]["Create View"] . ";/* MySQLReback Separation */";
}
if (!empty($tableRs[0]["Create Table"])) {
$this->content .= "rn /* 创建表结构 {$table} */";
$this->content .= "rn DROP TABLE IF EXISTS {$table};/* MySQLReback Separation */ " . $tableRs[0]["Create Table"] . ";/* MySQLReback Separation */";
$tableDateRow = $this->model->query("SELECT * FROM {$table}");
$valuesArr = array();
$values = '';
if (false != $tableDateRow) {
foreach ($tableDateRow as &$y) {
foreach ($y as &$v) {
if ($v=='') //纠正empty 为0的时候 返回tree
$v = 'null'; //为空设为null
else
$v = "'" . mysql_escape_string($v) . "'"; //非空 加转意符
}
$valuesArr[] = '(' . implode(',', $y) . ')';
}
}
$temp = $this->chunkArrayByByte($valuesArr);
if (is_array($temp)) {
foreach ($temp as $v) {
$values = implode(',', $v) . ';/* MySQLReback Separation */';
if ($values != ';/* MySQLReback Separation */') {
$this->content .= "rn /* 插入数据 {$table} */";
$this->content .= "rn INSERT INTO {$table} VALUES {$values}";
}
}
}
// dump($this->content);
// exit;
}
}
if (!empty($this->content)) {
$this->setFile();
}
return true;
}
/* -
* +------------------------------------------------------------------------
* * @ 还原数据
* +------------------------------------------------------------------------
* * @ $fileName 文件名
* +------------------------------------------------------------------------
*/
private function recover_file($fileName) {
$this->getFile($fileName);
if (!empty($this->content)) {
$content = explode(';/* MySQLReback Separation */', $this->content);
foreach ($content as $i => $sql) {
$sql = trim($sql);
if (!empty($sql)) {
$mes = $this->model->execute($sql);
if (false === $mes) { //如果 null 写入失败，换成 ''
$table_change = array('null' => '''');
$sql = strtr($sql, $table_change);
$mes = $this->model->execute($sql);
}
if (false === $mes) { //如果遇到错误、记录错误
$log_text = '以下代码还原遇到问题:';
$log_text.="rn $sql";
set_log($log_text);
}
}
}
} else {
$this->error('无法读取备份文件!');
}
return true;
}
}
?>
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