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SQL Server Stored Procedure Return Values
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- Main Methods
- Stored procedures can return values using return codes, result sets, or output parameters
- Return codes indicate procedure execution status, with 0 indicating success
- Result sets are groups of records returned from queries
- Output parameters allow returning values of any data type
- Return Values
- Return codes are always integer values
- Negative values indicate errors, -6 for user-related issues
- -4 indicates permission errors
- NULL values must be returned using output parameters
- Best Practices
- Return values should only be integer types
- Use return codes for status checking only
- Avoid returning table-valued variables directly
- Use IF EXISTS clause for value existence checks
- Special Cases
- Multiple values can be returned using multiple output parameters
- Row counts can be returned using @@ROWCOUNT function
- Transaction status can be checked using return codes
- Return codes should not be used for error handling