CHAPTER 10

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The Query API and JPQL

The Java Persistence API (JPA) utilizes a query language for communicating with underlying data stores. Although Java EE uses entities rather than SQL for database access, it provides a query language so that developers can obtain the required information via the entities. The Java Persistence Query Language (JPQL) does just that because it provides a facility for querying and working with Java EE entity objects. Although it is very similar to SQL, it is an object-relational query language, so there are some minor differences of which developers should be aware. Using JPQL along with Java EE entities allows developers ...

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