Question

我对以下SP有一个奇怪的问题：

CREATE PROCEDURE [dbo].[Manufacturer_GetProductsCountByManufacturedId]
(
    @ManufacturerIds NVARCHAR(MAX) = '',
    @ExcludeType INT
)
AS
BEGIN   
    DECLARE @ManufacturerId NVARCHAR(MAX)
    DECLARE @GoodManufacturerIds NVARCHAR(MAX) = ''
    DECLARE @result BIGINT  
    DECLARE @pos INT
    DECLARE @len INT

    SET @GoodManufacturerIds = ''
    SET @pos = 0
    SET @len = 0

    WHILE CHARINDEX(',', @ManufacturerIds, @pos + 1)>0
    BEGIN
        -- Split
        SET @len = CHARINDEX(',', @ManufacturerIds, @pos+1) - @pos
        SET @ManufacturerId = SUBSTRING(@ManufacturerIds, @pos, @len)

        -- Check
        SELECT TOP 1 @result = p.ProductId
        FROM [MYDB].[dbo].[Product] p
        INNER JOIN [MYDB].[ProductTyping].[TypedProductFieldValue] tpfv ON tpfv.ProductId = p.ProductId
        WHERE ManufacturerId = @ManufacturerId 
        AND tpfv.ProductTypeId <> @ExcludeType    

        IF @result > 0
            SET @GoodManufacturerIds = @GoodManufacturerIds + @ManufacturerId + ','
        SET @pos = CHARINDEX(',', @ManufacturerIds, @pos+@len)+1
    END
    -- Last comma kaputt
    SET @GoodManufacturerIds = LEFT(@GoodManufacturerIds, LEN(@GoodManufacturerIds) - 1)

    RETURN @GoodManufacturerIds
END

基本上我必须用逗号分隔的值拆分一个字符串，对于这些值的每一个，我执行一个查询并将结果放在另一个以逗号分隔的字符串中。如果我将这些值作为存储过程参数发送，（＆＃34; 5220,3008,1561,2678，＆＃34; 和 5 ）我收到错误，< em>＆＃34;无法投射nvarchar值＆＃39; 5220,3008,1561,2678＆＃39;输入int＆＃34; 。但是如果我在存储过程中将这些值构建为：

    DECLARE @ManufacturerId NVARCHAR(MAX)
    DECLARE @GoodManufacturerIds NVARCHAR(MAX) = ''
    DECLARE @result BIGINT  
    DECLARE @pos INT
    DECLARE @len INT

    -- test
    DECLARE @ManufacturerIds NVARCHAR(MAX) = ''
    DECLARE @ExcludeType INT    
    SET @ManufacturerIds = '5220,3008,1561,2678,13715,5047,'
    SET @ExcludeType = 5

    SET @GoodManufacturerIds = ''
    SET @pos = 0
    SET @len = 0

    WHILE CHARINDEX(',', @ManufacturerIds, @pos + 1)>0
    BEGIN
        -- Split
        SET @len = CHARINDEX(',', @ManufacturerIds, @pos+1) - @pos
        SET @ManufacturerId = SUBSTRING(@ManufacturerIds, @pos, @len)

        -- Check
        SELECT TOP 1 @result = p.ProductId
        FROM [MYDB].[dbo].[Product] p
        INNER JOIN [MYDB].[ProductTyping].[TypedProductFieldValue] tpfv ON tpfv.ProductId = p.ProductId
        WHERE ManufacturerId = @ManufacturerId 
        AND tpfv.ProductTypeId <> @ExcludeType    

        IF @result > 0
            SET @GoodManufacturerIds = @GoodManufacturerIds + @ManufacturerId + ','
        SET @pos = CHARINDEX(',', @ManufacturerIds, @pos+@len)+1
    END
    -- Last comma kaputt
    SET @GoodManufacturerIds = LEFT(@GoodManufacturerIds, LEN(@GoodManufacturerIds) - 1)

    RETURN @GoodManufacturerIds

一切正常，我得到了新的字符串。我不知道第一个程序中的错误可能在哪里，任何提示？

Answer 1

我发现了错误，我正在使用RETURN但是RETURN用于整数值，在这种情况下，我的是一个字符串，所以放置SELECT使一切正常。

存储过程强制转换

1 个答案: