• 1.sqlSession不同

@Testpublic void test05() throws IOException {SqlSessionFactory sqlSessionFactory = getSqlSessionFactory();SqlSession sqlSession01 = sqlSessionFactory.openSession();try{EmployeeMapper mapper01 = sqlSession01.getMapper(EmployeeMapper.class);Employee emp01 = mapper01.getEmpById(1);System.out.println(emp01);SqlSession sqlSession02 = sqlSessionFactory.openSession();EmployeeMapper mapper02 = sqlSession02.getMapper(EmployeeMapper.class);Employee emp02 = mapper02.getEmpById(1);System.out.println(emp02);System.out.println(emp01==emp02);sqlSession02.close();}finally {sqlSession01.close();}}

• 2.sqlSession相同，查詢條件不同

@Testpublic void test05() throws IOException {SqlSessionFactory sqlSessionFactory = getSqlSessionFactory();SqlSession sqlSession01 = sqlSessionFactory.openSession();try{EmployeeMapper mapper01 = sqlSession01.getMapper(EmployeeMapper.class);Employee emp01 = mapper01.getEmpById(1);System.out.println(emp01);// SqlSession sqlSession02 = sqlSessionFactory.openSession(); // // EmployeeMapper mapper02 = sqlSession02.getMapper(EmployeeMapper.class);Employee emp02 = mapper01.getEmpById(2);System.out.println(emp02);System.out.println(emp01==emp02);// sqlSession02.close();}finally {sqlSession01.close();}}

• 3.sqlSession相同，兩次查詢之間執行了增刪改操作（這次增刪改可能對當前數據有影響）

@Testpublic void test05() throws IOException {SqlSessionFactory sqlSessionFactory = getSqlSessionFactory();SqlSession sqlSession01 = sqlSessionFactory.openSession();try{EmployeeMapper mapper01 = sqlSession01.getMapper(EmployeeMapper.class);Employee emp01 = mapper01.getEmpById(1);System.out.println(emp01);// SqlSession sqlSession02 = sqlSessionFactory.openSession(); // // EmployeeMapper mapper02 = sqlSession02.getMapper(EmployeeMapper.class);mapper01.addEmp(new Employee(null,"testCache","cache","1"));System.out.println("數據添加成功");Employee emp02 = mapper01.getEmpById(2);System.out.println(emp02);System.out.println(emp01==emp02);// sqlSession02.close();}finally {sqlSession01.close();}}

• 4.sqlSession相同，手動清除了一級緩存（緩存清空）

@Testpublic void test05() throws IOException {SqlSessionFactory sqlSessionFactory = getSqlSessionFactory();SqlSession sqlSession01 = sqlSessionFactory.openSession();try{EmployeeMapper mapper01 = sqlSession01.getMapper(EmployeeMapper.class);Employee emp01 = mapper01.getEmpById(1);System.out.println(emp01);// SqlSession sqlSession02 = sqlSessionFactory.openSession(); // // EmployeeMapper mapper02 = sqlSession02.getMapper(EmployeeMapper.class);// mapper01.addEmp(new Employee(null,"testCache","cache","1")); System.out.println("數據添加成功");sqlSession01.clearCache();Employee emp02 = mapper01.getEmpById(2);System.out.println(emp02);System.out.println(emp01==emp02);// sqlSession02.close();}finally {sqlSession01.close();}}

總結

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