Hibernate 的*.hbm.xml文件的填寫技巧

  

=================================================================================

模板：

<!-- ？屬性，本類與？類的多對多的關係 -->

<set name="第一個問號值" table="中間表（類名_對方類名 或 對方類名_類名）其中兩個地方的要同樣">
<key column=" （本類的名字+Id） "></key>
<many-to-many class="第二個問號值" column="（對方的key裏面的column屬性的值）"></many-to-many>
</set>

<!-- ？屬性，本類與？類的多對一的關係 -->
<many-to-one name="（第一個問號的值）" class="（第二個問號的值）" column="（name的屬性名 + Id）"></many-to-one>

<!-- ？屬性，本類與？類的一對多 -->
<set name="（第一個問號的值）">
<key column="（與其關聯（多對一中）的類的column的值） "></key>
<one-to-many class="（第二個問號的值）" />
</set>

==================================================================================

 

-------------------------------------------------------------------------------------------------------------------

eg：

-------------------------------------------------------------------------------------------------
<!-- department屬性，本類與Department的多對一 -->
<many-to-one name="department" class="Department" column="departmentId"></many-to-one>


<!-- roles屬性，本類與Role的多對多 -->
<set name="roles" table="itcast_user_role">
<key column="userId"></key>
<many-to-many class="Role" column="roleId"></many-to-many>
</set>


<!-- users屬性，本類與User的一對多 -->
<set name="users">
<key column="departmentId"></key>
<one-to-many class="User" />
</set>
---------------------------------------------------------------------------------------------------
---------------------------------------------------------------------------------------------------
<!-- parent屬性，本類與Department（上級）的多對一 -->
<many-to-one name="parent" class="Department" column="parentId"></many-to-one>

 

<!-- children屬性，本類與Department（下級）的一對多 -->
<set name="children">
<key column="parentId"></key>
<one-to-many class="Department" />
</set>
---------------------------------------------------------------------------------
---------------------------------------------------------------------------------


<!-- users屬性，本類與User的多對多 -->
<set name="users" table="itcast_user_role">
<key column="roleId"></key>
<many-to-many class="User" column="userId"></many-to-many>
</set>
------------------------------------------------------------------------
------------------------------------------------------------------------