Hibernate 的 findByExample 用法需要注意的地方

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

Company company = companyDao.getById( "id" );  

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

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

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

 

这个时候的后台打印SQL语句为：

 

select * from user

where username = ?

and password = ?

 

结论：findByExample

1.不支持主键

2.不支持关联
3.不支持NULL