/**
     * 1、根據(jù)xml配置文件（全局配置文件mybatis-config.xml）創(chuàng)建一個(gè)SqlsessionFactory對(duì)象，mybatis-config.xml有數(shù)據(jù)源一些環(huán)境信息
     * 2、sql映射文件EmployeeMapper.xml配置了每一個(gè)sql，以及sql的封裝規(guī)則等。
     * 3、將sql映射文件注冊(cè)在全局配置文件中
     * 4、寫(xiě)代碼：
     * 4.1.根據(jù)全局配置文件得到sqlsessionFactory
     * 4.2.使用SqlSession工程進(jìn)行crud,sqlseesion就代表和數(shù)據(jù)庫(kù)進(jìn)行會(huì)話(huà)，用完close
     * 4.3.使用sql標(biāo)識(shí)告知mybatis來(lái)執(zhí)行哪個(gè)sql,sql都是保存在sql映射文件中
     *
     * @throws IOException
     */
    @Test
    public void test() throws IOException {
        String resource = "mybatis-config.xml";
        InputStream inputStream = Resources.getResourceAsStream(resource);
        SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
        //2、獲取SqlSession實(shí)例，能直接執(zhí)行已經(jīng)映射了的sql語(yǔ)句，selectOne：sql唯一標(biāo)識(shí)，執(zhí)行sql要用到的參數(shù)
        SqlSession openSession = sqlSessionFactory.openSession();
        try {
            Employee employee = openSession.selectOne("com.ming.dao.EmployeeMapper.getEmpByID", 1);
            System.out.println(employee);
        } finally {
            openSession.close();
        }
    }

public Configuration parse() {
    if (parsed) {
      throw new BuilderException("Each XMLConfigBuilder can only be used once.");
    }
    parsed = true;
    parseConfiguration(parser.evalNode("/configuration"));
    return configuration;
  }

  @Test
    public void testInterface() throws IOException {
        SqlSessionFactory sqlSessionFactory = getSqlSessionFactory();
        SqlSession sqlSession = sqlSessionFactory.openSession();
        try {
            EmployeeMapper employeeMapper = sqlSession.getMapper(EmployeeMapper.class);
            Employee employee = employeeMapper.getEmpByID(1);
            System.out.println(employee);
            Employee employee2 = employeeMapper.getEmpByID(5);
            System.out.println(employee2);
            System.out.println(employee==employee2);

        }finally {
            sqlSession.close();
        }
    }

 StatementHandler handler = configuration.newStatementHandler(wrapper, ms, parameter, rowBounds, resultHandler, boundSql);
  public StatementHandler newStatementHandler(Executor executor, MappedStatement mappedStatement, Object parameterObject, 	RowBounds rowBounds, ResultHandler resultHandler, BoundSql boundSql) {
    StatementHandler statementHandler = new RoutingStatementHandler(executor, mappedStatement, parameterObject, rowBounds, resultHandler, boundSql);
    statementHandler = (StatementHandler) interceptorChain.pluginAll(statementHandler);
    return statementHandler;
  }