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# Understanding TopLink Queries

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TopLink enables you to create, read, update, and delete persistent objects or data using queries in both J2EE and non-J2EE applications for both relational and nonrelational data sources.

This chapter explains the following:

- Query Types

- Query Concepts

- Building Queries

- Executing Queries

- Handling Query Results

- Queries and the Cache

- Understanding the Query API