/**
 * 数据备份
 */
public function save(){$DB_HOST = getenv('DB_HOST');
    $DB_DATABASE = getenv('DB_DATABASE'); //从配置文件中获取数据库信息
    $DB_USERNAME = getenv('DB_USERNAME');
    $DB_PASSWORD = getenv('DB_PASSWORD');

    $dumpfname = $DB_DATABASE . "_" . date("Y-m-d_H-i-s").".sql";
    $command = "D:\\phpStudy2016\\MySQL\\bin\\mysqldump --add-drop-table --host=$DB_HOST --user=$DB_USERNAME ";
    if ($DB_PASSWORD) $command.= "--password=". $DB_PASSWORD ." ";
    $command.= $DB_DATABASE;
    $command.= " > " . $dumpfname;
    system($command);
    return view("errors.503")->with('info','数据备份成功，在根目录下'.$dumpfname)->with('url','/mysql/mysqlAdmin/index');

}

/**
 * 数据恢复
 * @param Request $request
 */
public function update_save(Request $request){$input = \Input::except('_token');

    $path = public_path();

    $file_name = $path.'\\'.$input['sql'];  //要导入的SQL文件名
    $file_name = str_replace('\\','/',$file_name);
    //dd($file_name);

    $DB_HOST = getenv('DB_HOST');
    $DB_DATABASE = getenv('DB_DATABASE'); //从配置文件中获取数据库信息
    $DB_USERNAME = getenv('DB_USERNAME');
    $DB_PASSWORD = getenv('DB_PASSWORD');

    set_time_limit(0); //设置超时时间为0，表示一直执行。当php在safe mode模式下无效，此时可能会导致导入超时，此时需要分段导入
    $fp = @fopen($file_name, "r") or die("不能打开SQL文件 $file_name");//打开文件
    //dd($fp);
    @mysql_connect($DB_HOST, $DB_USERNAME, $DB_PASSWORD) or die("不能连接数据库 $DB_HOST");//连接数据库
    @mysql_select_db($DB_DATABASE) or die ("不能打开数据库 $DB_DATABASE");//打开数据库

    echo "<p>正在清空数据库,请稍等....<br>";
    $result = mysql_query("SHOW tables");
    //dd($result);
    while ($currow=mysql_fetch_array($result)){mysql_query("drop TABLE IF EXISTS $currow[0]");
        echo "清空数据表【".$currow[0]."】成功！<br>";
    }echo "<br>恭喜你清理MYSQL成功<br>";

    echo "正在执行导入数据库操作<br>";
    // 导入数据库的MySQL命令
    //echo "mysql -u$DB_USERNAME -p$DB_PASSWORD $DB_DATABASE < ".$file_name;
    //echo "source ".$file_name;
    //exec("source ".$file_name);
    $_sql = file_get_contents($file_name);
    $_arr = explode(';', $_sql);
    //dd($_arr);
    foreach ($_arr as $_value) {mysql_query("SET NAMES 'utf8'");
        mysql_query($_value.';');
    }echo "<br>导入完成！";
    mysql_close();