php数据库备份还原类分享_php技巧

代码如下:
/**
* 数据库备份还原类
* @author xialeistudio
* Class DatabaseTool
*/
class DatabaseTool
{
private $handler;
private $config = array(
'host' => 'localhost',
'port' => 3306,
'user' => 'root',
'password' => '',
'database' => 'test',
'charset' => 'utf-8',
'target' => 'sql.sql'
);
private $tables = array();
private $error;
private $begin; //开始时间
/**
* 架构方法
* @param array $config
*/
public function __construct($config = array())
{
$this->begin = microtime(true);
$config = is_array($config) ? $config : array();
$this->config = array_merge($this->config, $config);
//启动PDO连接
if (!$this->handler instanceof PDO)
{
try
{
$this->handler = new PDO("mysql:host={$this->config['host']}:{$this->config['port']};dbname={$this->config['database']}", $this->config['user'], $this->config['password']);
}
catch (PDOException $e)
{
$this->error = $e->getMessage();
return false;
}
catch (Exception $e)
{
$this->error = $e->getMessage();
return false;
}
}
}

/**
* 备份
* @param array $tables
* @return bool
*/
public function backup($tables = array())
{
//存储表定义语句的数组
$ddl = array();
//存储数据的数组
$data = array();
$this->setTables($tables);
if (!empty($this->tables))
{
foreach ($this->tables as $table)
{
$ddl[] = $this->getDDL($table);
$data[] = $this->getData($table);
}
//开始写入
$this->writeToFile($this->tables, $ddl, $data);
}
else
{
$this->error = '数据库中没有表!';
return false;
}
}

/**
* 设置要备份的表
* @param array $tables
*/
private function setTables($tables = array())
{
if (!empty($tables) && is_array($tables))
{
//备份指定表
$this->tables = $tables;
}
else
{
//备份全部表
$this->tables = $this->getTables();
}
}

/**
* 查询
* @param string $sql
* @return mixed
*/
private function query($sql = '')
{
$stmt = $this->handler->query($sql);
$stmt->setFetchMode(PDO::FETCH_NUM);
$list = $stmt->fetchAll();
return $list;
}

/**
* 获取全部表
* @return array
*/
private function getTables()
{
$sql = 'SHOW TABLES';
$list = $this->query($sql);
$tables = array();
foreach ($list as $value)
{
$tables[] = $value[0];
}
return $tables;
}

/**
* 获取表定义语句
* @param string $table
* @return mixed
*/
private function getDDL($table = '')
{
$sql = "SHOW CREATE TABLE `{$table}`";
$ddl = $this->query($sql)[0][1] . ';';
return $ddl;
}

/**
* 获取表数据
* @param string $table
* @return mixed
*/
private function getData($table = '')
{
$sql = "SHOW COLUMNS FROM `{$table}`";
$list = $this->query($sql);
//字段
$columns = '';
//需要返回的SQL
$query = '';
foreach ($list as $value)
{
$columns .= "`{$value[0]}`,";
}
$columns = substr($columns, 0, -1);
$data = $this->query("SELECT * FROM `{$table}`");
foreach ($data as $value)
{
$dataSql = '';
foreach ($value as $v)
{
$dataSql .= "'{$v}',";
}
$dataSql = substr($dataSql, 0, -1);
$query .= "INSERT INTO `{$table}` ({$columns}) VALUES ({$dataSql});\r\n";
}
return $query;
}

/**
* 写入文件
* @param array $tables
* @param array $ddl
* @param array $data
*/
private function writeToFile($tables = array(), $ddl = array(), $data = array())
{
$str = "/*\r\nMySQL Database Backup Tools\r\n";
$str .= "Server:{$this->config['host']}:{$this->config['port']}\r\n";
$str .= "Database:{$this->config['database']}\r\n";
$str .= "Data:" . date('Y-m-d H:i:s', time()) . "\r\n*/\r\n";
$str .= "SET FOREIGN_KEY_CHECKS=0;\r\n";
$i = 0;
foreach ($tables as $table)
{
$str .= "-- ----------------------------\r\n";
$str .= "-- Table structure for {$table}\r\n";
$str .= "-- ----------------------------\r\n";
$str .= "DROP TABLE IF EXISTS `{$table}`;\r\n";
$str .= $ddl[$i] . "\r\n";
$str .= "-- ----------------------------\r\n";
$str .= "-- Records of {$table}\r\n";
$str .= "-- ----------------------------\r\n";
$str .= $data[$i] . "\r\n";
$i++;
}
echo file_put_contents($this->config['target'], $str) ? '备份成功!花费时间' . (microtime(true) - $this->begin) . 'ms' : '备份失败!';
}

/**
* 错误信息
* @return mixed
*/
public function getError()
{
return $this->error;
}

public function restore($path = '')
{
if (!file_exists($path))
{
$this->error('SQL文件不存在!');
return false;
}
else
{
$sql = $this->parseSQL($path);
try
{
$this->handler->exec($sql);
echo '还原成功!花费时间', (microtime(true) - $this->begin) . 'ms';
}
catch (PDOException $e)
{
$this->error = $e->getMessage();
return false;
}
}
}

/**
* 解析SQL文件为SQL语句数组
* @param string $path
* @return array|mixed|string
*/
private function parseSQL($path = '')
{
$sql = file_get_contents($path);
$sql = explode("\r\n", $sql);
//先消除--注释
$sql = array_filter($sql, function ($data)
{
if (empty($data) || preg_match('/^--.*/', $data))
{
return false;
}
else
{
return true;
}
});
$sql = implode('', $sql);
//删除/**/注释
$sql = preg_replace('/\/\*.*\*\//', '', $sql);
return $sql;
}
}