有两个实体类:User 和Department .
public class User
{
private String name;
private Department department;
get..set...(略)
}
public class Department
{
private int id;
private String dept_name;
}
数据库表:user 和department , user通过depart_id和department 关联。
user
( name, depart_id )
department
( id, dept_name)
现在有个User对象,需要insert到 user中,mapper文件怎么写啊?