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# SQL Calls

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SQL calls access fields in a relational database. TopLink supports the following SQL calls:

- SQLCall

- StoredProcedureCall

- StoredFunctionCall

Using the `Call` API (or SQL string conventions), you can specify input, output, and input-output parameters and assign values for input and input/output parameters.

Using a descriptor `ReturningPolicy`, you can control whether or not TopLink writes a parameter out, retrieves a value generated by the database, or both. For more information, see "Configuring Returning Policy".