qr code generator java 1.4 Hibernating with XDoclet in Java

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Unfortunately, the trial-and-error guessing game of which tag matches which element isn t a particular fun one for us anyway. This is one of the reasons why we created the appendix, which is called The complete Hibernate mapping catalog.
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Table 9.8 Common @hibernate.set attributes (continued) Attribute lazy Description Specifies whether the collection should be lazily initialized. Specifies whether the collection should be sorted in memory. Allows values are unsorted, natural, or the fully qualified class name of a java.util.Comparator. Specifies whether the query to fetch the collection should add a SQL ORDER BY clause. Allowable syntax is column_name asc | desc. Specifies whether the collection is inverse (determines which end of the collection is the parent). false. Default
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Collection is not sorted.
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No ORDER BY added. Note that it s a column name, not a property name.
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false.
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The simplest cases of one-to-many relationships will not likely need any attributes. You can add sorting, ordering, or laziness as your domain model dictates. The @hibernate.set tag is not the only collection type allowed; alternatively, @hibernate.array, @hibernate.primitive-array, @hibernate.bag, @hibernate.list, and @hibernate.map are possible top-level tags as well. In addition, the @hibernate.set tag needs the support of two more tags: @hibernate.collection-key and @hibernate.collection-one-to-many (or @hibernate.collectionmany-to-many).
9.4.3 The @hibernate.collection-key
All of the collections require the use of the <key> element. Otherwise, there is no foreign key to trace back from the individual object to the parent object. Therefore, a @hibernate.collection-key tag is necessary as well. It has only one attribute, as you can see in table 9.9.
Building collections
Table 9.9 @hibernate.collection-key attribute Attribute column Description Contains the name of the foreign key column on the object in the collection. Default No default; it s mandatory.
One thing might be confusing about this: when dealing with a many-tomany relationship, which foreign key column is which The <key> element/@hibernate.collection-key tag/key column is always on object in the collection. The way we like to remember it is that the <key> is named after the parent object. So on our example Event class, the <key> looks like this:
<!--This is right. Name the key column after the parent object --> <key column="event_id"/>
and not like this:
<!-- Wrong! Don't name keys after the collection --> <key column="speaker_id"/>
9.4.4 The @hibernate.collection-one-to-many tag
The @hibernate.collection-one-to-many and the @hibernate.collection-many-to-many tags are mutually exclusive because a single collection can only be one or the other. This section details the syntax associated with one-to-many. The many-to-many tag is functionally similar; you can find details about it in the appendix. This simple tag has one attribute, as table 9.10 shows. Be sure to spell the name of the class correctly; XDoclet won t warn you of a ClassNotFoundException during the generation process. A spelling error appears only at runtime (or unit-test time, whichever comes first).
Hibernating with XDoclet
Table 9.10 @hibernate.collection-one-to-many attribute Attribute class Description Contains the fully qualified name of the class in the collection. Default No default. Though not officially mandatory, since XDoclet can t guess and leaves it blank, you need to specify the class name.
9.5 Going where no XDoclet has gone before
As you may have guessed, most Hibernate relationships can be generated with XDoclet but certainly not all. As a dynamic open source project, Hibernate is a moving target. New features are added frequently. XDoclet is a separate project from Hibernate, maintained by a separate group of developers, so the features it supports will inevitably lag behind by a bit. This section covers the way in which you can work around or handle Hibernate mappings that XDoclet won t completely handle. Any codegeneration tool has a few scenarios that it isn t fully prepared to cover; obviously, the developers can t code for every possible situation. A good tool like XDoclet provides a number of workaround routes that you can use. Here are a couple of strategies to use with XDoclet if somehow it won t generate what you need:
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Which approach you should use depends mainly on the situation and how close the generated files are to what you want them to be. Let s look at each strategy in turn.
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