thinkphp中代码块执行代码

     try {
            $sql=file_get_contents(dirname(__DIR__) . '/data/web.sql');
        $instance = Db::connect($dbConfig,false);
            // 查询一次SQL,判断连接是否正常
         $instance->execute("SELECT 1");
        $instance->getConnection()->getPdo()->exec($sql);
//        thinkphp5.0可直接getPdo
//        $instance->getPdo()->exec($sql);
            // 调用原生PDO对象进行批量查询 getPdo()

//            $installError = session('install.error');
            $this->success("安装完成!", '', ['done' => 1, 'error' => 0]);
        } catch (\Throwable $t) {
            // Executed only in PHP 7, will not match in PHP 5
            $this->error($t->getMessage(), '', ['sql' => '', 'exception' => '']);
        } catch (\Exception $e) {
            // Executed only in PHP 5, will not be reached in PHP 7
            $this->error($e->getMessage(), '', ['sql' => '', 'exception' => '']);
        }