Raible's Wiki: HibernateRelationships

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The ''many-to-one'' relationship between __Entry__ and __Category__ can be established using XDoclet tags. Hibernate relationships can be established on either side of the relationship or bi-directionally. For this tutorial, this relationship is maintained by a __categoryId__ property and a __Category__ object in __Entry__. The list of possible categories for a weblog entry will eventually be represented as a drop-down on the UI. Add the following code to your __Entry.java__ class.

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The ''many-to-one'' relationship between __Entry__ and __Category__ can be established using XDoclet tags. Hibernate relationships can be established on either side of the relationship or bi-directionally. For this tutorial, this relationship will be maintained by an extra property and collection held by __Entry__. The list of possible categories for a weblog entry will eventually be represented as a drop-down on the UI. Add the following code to your __Entry.java__ class.

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Now you'll the __Weblog__ object and __Entry__ object to represent the multiplicity of a weblog that can have many entries. This relationship is set on the Weblog class using a java.util.List. XDoclet tags are used to establish this relationship using a __bag__ as the Hibernate collection type. Add the following code to your __Weblog.java__ class.

Now you'll modify the __Weblog__ object and __Entry__ object to represent the multiplicity of a weblog that can have many entries. This relationship is set on the Weblog class using a java.util.List. XDoclet tags are used to establish this relationship using a __bag__ as the Hibernate collection type. Add the following code to your __Weblog.java__ class.

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In addition to allow navigation from a Weblog object to their list of users, you need to add a Set of Weblogs to the User object - allowing that path of navigation as well. Modify ''User.java'' to add a ''weblogs'' Set and accessor methods. You might notice the __cascade="none"__ attribute. This is because this system doesn't currenly allow a weblog to be edited from the user screen and vise-versa. You'll change this in the section where you create the UI.

In addition, to allow navigation from a Weblog object to its list of users, you need to add a Set of Weblogs to the User object - allowing that path of navigation as well. Modify ''User.java'' to add a ''weblogs'' Set and accessor methods. You might notice the __cascade="none"__ attribute. This is because this system doesn't currenly allow a weblog to be edited from the user screen and vise-versa. You'll change this in the section where you create the UI.

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