October 2006
Intermediate to advanced
880 pages
22h 11m
English
Content preview from Java Persistence with Hibernate
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13.2. Selecting a fetch strategy
Hibernate executes SQL SELECT statements to load objects into memory. If you load an object, a single or several SELECTs are executed, depending on the number of tables which are involved and the fetching strategy you've applied.
Your goal is to minimize the number of SQL statements and to simplify the SQL statements, so that querying can be as efficient as possible. You do this by applying the best fetching strategy for each collection or association. Let's walk through the different options step by step.
By default, Hibernate fetches associated objects and collections lazily whenever you access them (we assume that you map all to-one associations as FetchType.LAZY if you use Java Persistence). Look at the following ...
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