10 Understanding Queries

EclipseLink enables you to create, read, update, and delete persistent objects or data using queries in both Java EE and non-Java EE applications for both relational and nonrelational data sources.

This chapter includes the following sections:

• Query Concepts

• About JPQL Queries

• About SQL Query Language

• About the Criteria API

• About Native SQL Queries

• About Advanced Native Query Support

• About JPA Query Hints

• About Query Casting

• About Oracle Extensions for Queries