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# Using DatabaseQuery Queries

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This section describes creating and executing `DatabaseQuery` queries to perform a variety of basic persistence operations, including the following:

- Reading Objects Using a DatabaseQuery

- Creating, Updating, and Deleting Objects With a DatabaseQuery

- Reading Data With a DatabaseQuery

- Updating Data With a DatabaseQuery

- Specifying a Custom SQL String in a DatabaseQuery

- Specifying a Custom EJB QL String in a DatabaseQuery

- Using Parameterized SQL and Statement Caching in a DatabaseQuery