Hibernate/Spring的findByExample

Class User{
    String username;
    String password = "默认口令";
    Company company;
    getter()&setter().....
}

Company company = companyDao.getById("id");
User user = new User();
user.setSid("主键");
uer.setUsername("user");
use.setCompany(company);
userDao.findByExample(user);

这个时候的SQL条件为： 

select * from user
where username = ?
and password = ?

findByExample（）使用时得出结论： 
1.不支持主键 
2.不支持关联 
3.不支持NULL 

引用

Version properties, identifiers and associations are ignored. By default, null valued properties are excluded