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11.1 Filters
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Suppose your application tracks sales for a company, and you only want to see sales for each person for the current quarter. You could probably handle this by writing an HQL statement to return the current results for the quarter, but calling an external query isn t ideal if the same business rule should be applied every time the results are viewed. Instead, it makes sense to apply a filter on the returned data at runtime. This is where filters come in. Filters, or virtualization, allow you to apply filtering criteria to returned objects at the Session level. You can pass parameters to filters, and they work with classes or collections. To use filters, you first define them in the mapping files, and then enable a given filter by name when using the Session object. The filters are defined in the mapping definition, within the hibernate-mapping element:
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<hibernate-mapping> <filter-def name="nameFilter"> <filter-param name="nameFilterParam" type="string"/> </filter-def> </hibernate-mapping>
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With the filter defined, we can apply it to persistent classes and collections:
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<class name="Event"> <filter name="nameFilter" condition=":nameFilterParam = name"/> <set name="attendees"> <filter name="nameFilter" condition=v:nameFilterParam = last_name"/> </set> </class>
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What s new in Hibernate 3
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This code applies the filter to the name column in the events table, and to the last_name column in the attendees table. To apply the filters, you must explicitly enable them at the Session level:
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Filter f = session.enableFilter("nameFilter"); f.setParameter("nameFilterParam", "Plenary"); List results = session.createQuery("from Event").list();
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This code enables the named filter and then sets the filter parameter. The results will only contain instances of Event with the name Plenary. You can also enable multiple filters per session. Filters are one of a handful of improvements made to object mapping. The next section discusses a few of the more significant mappings.
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11.2 Mapping improvements
Although the earlier versions of Hibernate handled the vast majority of mapping requirements, in a few corner cases it was lacking, particularly when Hibernate was introduced into a legacy database schema. We ll examine a few of the improvements in this section.
11.2.1 Multiple table mapping
One of the most significant improvements involves mapping a single persistent class to multiple tables. Ideally, you won t need to do this with new applications, but it s often required when you re working with legacy applications. To support mapping a class to multiple tables, Hibernate adds the <join> element. Using the <join> element is straightforward:
<join table="event_detail"> <key column="event_id"/> <property name="startDate" type="date"/>
Mapping improvements
<many-to-one class="Location" column="location_id"/> </join>
The following shows the <join> element in the context of the Event class:
<class name="Event" table="events"> <join table="event_detail"> <key column="event_id"/> <property name="startDate" type="date"/> <many-to-one class="Location" column="location_id"/> </join> </class>
Notice the <key> element. You ve seen this element every time the parent object interacts with another table, typically with collections. In this case, the join table has a foreign key to the parent Event class. The <join> element can be used inside the class or subclass element, and can contain the same elements as a class or subclass. You probably won t need to use the <join> element very often, but it can be useful in isolated cases with legacy databases.
11.2.2 Discriminator formulas
Discriminators, which we discussed in chapter 3, are used to determine the class type in an inheritance hierarchy. The discriminator value is typically stored in its own column in the table, but this is possible only if you re starting a project with Hibernate, or you re allowed to modify an existing schema. If you are unable to provide a specific column for the discriminator value, you can use a snippet of SQL to determine the exact class type. Most of the time, the SQL will be a CASE statement returning a value to indicate the class type. The formula can be specified as an attribute to the discriminator element, or as a child element:
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