Is there a way to determine if a parameter in a stored proc has a default value (and thus not required) in code - .Net?

Question

I am already pulling the parameters from the stored proc sent in like this:

 foreach (SqlParameter param in cmd.Parameters)
            {
               if (         


        

Answer 1

Try this query. It returns default values for any stored procedure/function -

SELECT
      data2.[object_name]   
    , data2.name
    , has_default_value = 
        CASE WHEN data2.ptoken LIKE '%=%' 
            THEN 1 
            ELSE 0
        END
FROM (
    SELECT  
          data.name
        , data.[object_name]
        , ptoken = SUBSTRING(
                data.tokens
            , token_pos + name_length + 1
            , ISNULL(ABS(next_token_pos - token_pos - name_length - 1), LEN(data.tokens))
        )
    FROM (
        SELECT  
              sm3.tokens
            , sm3.[object_name]
            , p.name
            , name_length = LEN(p.name)
            , token_pos = CHARINDEX(p.name, sm3.tokens)
            , next_token_pos = CHARINDEX(p2.name, sm3.tokens)
        FROM (
            SELECT 
                  sm2.[object_id]
                , sm2.[type]
                , sm2.[object_name]
                , tokens = REVERSE(
                    CASE WHEN sm2.[type] IN ('FN', 'TF', 'IF') 
                        THEN SUBSTRING(sm2.tokens, ISNULL(CHARINDEX(N')', sm2.tokens) + 1, 0), LEN(sm2.tokens)) 
                        ELSE SUBSTRING(sm2.tokens, ISNULL(CHARINDEX('SA', sm2.tokens) + 2, 0), LEN(sm2.tokens))  
                    END
                ) 
            FROM (
                SELECT 
                      sm.[object_id]
                    , o.[type]
                    , [object_name] = s.name + '.' + o.name
                    , tokens = REVERSE(CASE WHEN o.[type] IN ('FN', 'TF', 'IF') 
                        THEN SUBSTRING(
                                  sm.[definition]
                                , CHARINDEX(N'(', sm.[definition]) + 1
                                , ABS(CHARINDEX(N'RETURNS', sm.[definition]) - CHARINDEX(N'(', sm.[definition]) - 1)
                                ) 
                        ELSE SUBSTRING(
                                  sm.[definition]
                                , CHARINDEX(o.name, sm.[definition]) + LEN(o.name) + 1
                                , ABS(CHARINDEX(N'AS', sm.[definition]))
                                )  
                        END
                    ) 
                FROM sys.sql_modules sm WITH (NOLOCK)
                JOIN sys.objects o WITH (NOLOCK) ON sm.[object_id] = o.[object_id] 
                JOIN sys.schemas s WITH (NOLOCK) ON o.[schema_id] = s.[schema_id]
                WHERE o.[type] IN ('P ', 'FN', 'IF', 'TF')
                    AND s.name + '.' + o.name = 'dbo.usp_test1'
            ) sm2
            WHERE sm2.tokens LIKE '%=%'
        ) sm3
        JOIN sys.parameters p WITH (NOLOCK) ON sm3.[object_id] = p.[object_id]
        OUTER APPLY (
            SELECT p2.name
            FROM sys.parameters p2 WITH (NOLOCK) 
            WHERE p2.is_output = 0
                AND sm3.[object_id] = p2.[object_id] 
                AND p.parameter_id + 1 = p2.parameter_id
        ) p2
        WHERE p.is_output = 0
    ) data
) data2