public SqlSession openSession() {

        return this.openSessionFromDataSource(this.configuration.getDefaultExecutorType(), (TransactionIsolationLevel)null, false);

    }

    private SqlSession openSessionFromDataSource(ExecutorType execType, TransactionIsolationLevel level, boolean autoCommit) {

        Transaction tx = null;

        DefaultSqlSession var8;

        try {

            Environment environment = this.configuration.getEnvironment();

            TransactionFactory transactionFactory = this.getTransactionFactoryFromEnvironment(environment);

            tx = transactionFactory.newTransaction(environment.getDataSource(), level, autoCommit);

            Executor executor = this.configuration.newExecutor(tx, execType);

            var8 = new DefaultSqlSession(this.configuration, executor, autoCommit);

        } catch (Exception var12) {

            this.closeTransaction(tx);

            throw ExceptionFactory.wrapException("Error opening session.  Cause: " + var12, var12);

        } finally {

            ErrorContext.instance().reset();

        }

        return var8;

    }

        SqlSession session = MybatisUtil.getSession();

        UserMapper userMapper = session.getMapper(UserMapper.class);

        try{

            UserDomain newUserDomain = new UserDomain();

            newUserDomain.setAge(10);

            newUserDomain.setName("scp2");

            newUserDomain.setSchool("高中");

            userMapper.insert(newUserDomain);

            session.commit();// 如果不commit，连接断开时操作会被回滚

        }

        catch (Exception e){

            System.out.println(e);

        }

        finally {

            if (null != session) {session.close();}

        }