Unidirectional N: 1 middle table ing

In fact, there is no need to map intermediate tables in part of the time, it seems a lot more, but hibernate also supports this operation, the specific one-way N: 1. If no intermediate table ing exists, refer to mappings.

Now only the changed parts are posted.

 <?  XML version = "1.0" encoding = "UTF-8"  ?>  <!  Doctype hibernate-mapping public "-// hibernate/hibernate mapping DTD 3.0 //" http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd"  >  <  Hibernate-Mapping  >      < Class  Name  = "Com. longtech. hibernate. domain. Employee"  Table  = "Employee"  >           <  ID  Name  = "ID"  Column  = "ID"  Type  = "Java. Lang. Long"   >              < Meta  Attribute  = "Field-description"  > Unique Identifier </  Meta  >              <  Generator  Class  = "Native"  />          </  ID  >          <  Property Name  = "Name"  Type  = "Java. Lang. String"  Column  = "Name"  Length  = "20"  >              <  Meta  Attribute  = "Field-description"  > Employee name </  Meta >          </  Property  >          <! --  <Role-to-one name = "department" column = "dept_id" cascade = "all"> </role-to-one>  -->          <  Join  Table  = "Maid"  >              <  Key  Column  = "Empid" > </  Key  >              <  Allow-to-one  Name  = "Department"  Cascade  = "All"  Column  = "Deptid"  > </  Allow-to-one  >          </  Join  >     </  Class  >  </  Hibernate-Mapping  > 

The changed part adds a join label. When using join, an intermediate table is usually specified.

At the database level, it will have an additional intermediate table

			empid	deptid
			1	1