Abstract
When you use JDBC to access databases, you write SQL statements for the query and update tasks. In such cases, you’re dealing with tables, columns, and joins. When you use Hibernate, most update tasks can be accomplished through the provided APIs. However, you still need to use a query language for the query tasks, and Hibernate provides a powerful query language called Hibernate Query Language (HQL).
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Notes
- 1.
You can define queries in annotations and in XML files. Because the query annotations are package-level, you can centralize them in a package-info.java as well (see http://docs.oracle.com/javase/specs/jls/se8/html/jls-7.html#jls-7.4.1 for more information).
- 2.
As usual, one of your authors far prefers the annotations for named queries; your mileage may vary.
- 3.
Note that with the exception of Java class names and properties, queries are not case-sensitive; SeLeCt is the same as select or SELECT. Go nuts. Nobody will care except obsessive-compulsive programmers—and they’ll probably care a lot.
- 4.
In case you’re desperately interested, explicit joins are outer joins just like implicit joins are inner joins.
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© 2015 Joseph Ottinger
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Ottinger, J., Guruzu, S., Mak, G. (2015). HQL and JPA Query Language. In: Hibernate Recipes. Apress, Berkeley, CA. https://doi.org/10.1007/978-1-4842-0127-5_8
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DOI: https://doi.org/10.1007/978-1-4842-0127-5_8
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Publisher Name: Apress, Berkeley, CA
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