Why Does My Stored Procedure Throw a 'Procedure or Function Expects Parameter Which Was Not Supplied' Error?

Stored Procedure Parameters Mismatch: "Procedure or Function Expects Parameter Which Is Not Supplied"

When working with database connectivity, it's crucial to align the parameters defined in a stored procedure with those being passed in from the calling code. Failure to do so can result in an error such as "Procedure or function 'SHOWuser' expects parameter '@userID', which was not supplied."

In the provided example, the stored procedure SHOWuser is expected to receive three parameters: @userName, @password, and @emailAddress. However, the code attempts to execute the stored procedure without providing a value for the @userID parameter, which is used in the subsequent INSERT and SELECT statements within the procedure.

Resolving the Parameter Mismatch

To resolve the issue, you need to ensure that all parameters required by the stored procedure are included in the cmd.Parameters collection:

cmd.Parameters.AddWithValue("@userName", userName);
cmd.Parameters.AddWithValue("@password", password);
cmd.Parameters.AddWithValue("@emailAddress", emailAddress);
cmd.Parameters.AddWithValue("@userID", user_id); // Add the missing parameter

Once all necessary parameters are accounted for, the stored procedure should execute successfully without the parameter mismatch error.

Additional Considerations

It's also worth noting that the type of command should be specified explicitly as a stored procedure:

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

This ensures that the database server is aware of the nature of the command being executed. Without specifying the command type, you may encounter unexpected behavior.

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