mybatis Example的Criteria用法:or与isNull详解

BaUserExample baUserExample = new BaUserExample();
Criteria criteria1 = baUserExample.createCriteria();
criteria1.andOrgIdEqualTo(“1”);
criteria1.andDeptIdEqualTo(“1”);
Criteria criteria2 = baUserExample.createCriteria();
criteria2.andUserNameEqualTo(“name”);
criteria2.andEmailLike("%test@%");
baUserExample.or(criteria2);
userMapper.countByExample(baUserExample);

@Test
 public void test1() throws IOException {
  SqlSessionFactory sqlSessionFactory = getSqlSessionFactory();
  SqlSession openSession = sqlSessionFactory.openSession(true);
  try {
   EmployeeMapper mapper = openSession.getMapper(EmployeeMapper.class);
//   List<Employee> selectAll = mapper.selectByExample(null);
   EmployeeExample example = new  EmployeeExample();
   Criteria criteria = example.createCriteria();
   criteria.andNameLike("%r%");
   criteria.andGenderEqualTo("1");
   Criteria criteria2 = example.createCriteria();
   criteria2.andEmailLike("%1%");
   example.or(criteria2);
   List<Employee> select = mapper.selectByExample(example);
   for(Employee employee :select) {
   System.out.println(employee.getName()+employee.getEmail());
   }
  }finally {
   openSession.close();
  }
 }

criteria.andNameLike("%r%");   
criteria.andGenderEqualTo("1");

Criteria criteria2 = example.createCriteria();   
criteria2.andEmailLike("%1%"); 
example.or(criteria2);