Why Is My SQL Server Stored Procedure Throwing a 'Procedure or function expects parameter which was not supplied' Error?

"Stored Procedure or Function Expects Parameter Which Is Not Supplied" Error in SQL Server

When using stored procedures or functions in SQL Server, it's crucial to ensure that all required parameters are supplied. However, sometimes developers encounter the following error:

Procedure or function 'SHOWuser' expects parameter '@userID', which was not supplied.

This error indicates that a parameter is missing when calling the stored procedure. In the given scenario, the stored procedure "SHOWuser" requires a parameter named "@userID," but it's not included in the code.

Upon verifying that the stored procedure definition includes the necessary parameter, developers may also want to check the following:

1. Command Type:

Ensure that the command type has been properly set to "StoredProcedure" as seen in the code snippet:

cmd.CommandType = System.Data.CommandType.StoredProcedure;

2. Clear Parameters:

When executing multiple commands within the same function, it's essential to clear the command parameters after each execution:

cmd.Parameters.Clear();

3. Check Stored Procedure Definition:

Double-verify that the stored procedure definition matches the code you're calling. Syntax errors or missing parameters in the stored procedure can lead to this error.

4. Data Types:

Confirm that the data types supplied in the parameters match the expected types in the stored procedure definition. Mismatched data types can result in parameter supply issues.

By addressing these potential causes, developers can resolve the "Stored procedure or function expects parameter which is not supplied" error and ensure accurate execution of database operations.

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