Question

我知道我可以使用以下查询来查找所有存储过程及其参数：

SELECT 
    r.*, p.*
FROM
    INFORMATION_SCHEMA.ROUTINES AS r INNER JOIN
    INFORMATION_SCHEMA.PARAMETERS AS p 
    ON r.SPECIFIC_SCHEMA = p.SPECIFIC_SCHEMA AND r.SPECIFIC_NAME = p.SPECIFIC_NAME
WHERE     (r.ROUTINE_TYPE = N'PROCEDURE')

从这里我可以看到（几乎）有关参数的所有信息，但我不知道如何找到哪些是可空的或具有默认值。

有没有办法找到这个？

谢谢

Answer 1

所有参数都可以为空。没有语法指定不应传递NULL。

要查找具有默认值的那些，您可以检查sys.parameters以获取CLR存储过程

SELECT has_default_value,name
FROM sys.parameters
where object_id=object_id('YourProc')

不幸的是，这个列is not currently populated correctly用于TSQL存储过程，并且唯一的方法是解析对象定义。

Answer 2

尝试此查询以获取特定存储过程的所有默认值 -

SELECT  
      data3.[object_name]
    , data3.name
    , [default_value] = REVERSE(RTRIM(SUBSTRING(
            data3.rtoken
        , CASE 
            WHEN CHARINDEX(N',', data3.rtoken) > 0 
                THEN CHARINDEX(N',', data3.rtoken) + 1
            WHEN CHARINDEX(N')', data3.rtoken) > 0 
                THEN CHARINDEX(N')', data3.rtoken) + 1
            ELSE 1 
            END
        , LEN(data3.rtoken)
        )))
FROM (
    SELECT  
          data2.name
        , data2.[object_name]
        , rtoken = CASE WHEN data2.ptoken LIKE '%=%' 
            THEN REVERSE(SUBSTRING(ptoken
                        , CHARINDEX('=', ptoken, 1) + 1
                        , LEN(data2.ptoken))
                    )
            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.[object_name]
                    , tokens = REVERSE(SUBSTRING(sm2.tokens, ISNULL(CHARINDEX('SA', sm2.tokens) + 2, 0), LEN(sm2.tokens))) 
                FROM (
                    SELECT 
                          sm.[object_id]
                        , [object_name] = s.name + '.' + o.name
                        , tokens = REVERSE(SUBSTRING(
                                        sm.[definition]
                                    , CHARINDEX(o.name, sm.[definition]) + LEN(o.name) + 1
                                    , ABS(CHARINDEX(N'AS', sm.[definition]))
                                    )  
                        ) 
                    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] = 'P '
                ) 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
) data3

查找存储过程的哪些参数可以为空（可选）

2 个答案: