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# Data-Level Read Query

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Using a `DataLevelReadQuery`, you can query your data source and return `Object` instances that match the specified selection criteria. This section describes the following:

- DataReadQuery

- DirectReadQuery

- ValueReadQuery

For more information, see "Reading Data With a DatabaseQuery".

WARNING: Allowing an unverified SQL string to be passed into constructors of such objects as `DataReadQuery`, `DirectReadQuery` and `ValueReadQuery` makes your application vulnerable to SQL injection attacks.