将存储过程的结果返回给SQL变量

我有一个名为

GetLatestUsageFactor801UNR

的存储过程，它返回一个精度为18,10的十进制值，但是当我使用下面的代码时，我总是被返回一个零，如何将存储过程的结果设置到变量中，就像在变量保持为零后进行选择一样

DECLARE @UsageFactor801UNR decimal(18,10)
EXEC @UsageFactor801UNR = GetLatestUsageFactor801UNR
SELECT @UsageFactor801UNR

我正在使用SQL Server作为我的RDBMS

我的存储过程如下所示：

select TOP 1 TotalUsageFactor as '801 UNR Usage Factor'
from MarketMessage as a
inner join messagetype591 as b on a.MarketMessageID = b.MarketMessageID
inner join AdditionalAggregationInformation as c on b.MessageType591ID = c.MessageType591ID
inner join AdditionalAggregationData as d on c.AdditionalAggregationInformationID = d.AdditionalAggregationInformationID
where SettlementRunIndicator = 20
and LoadProfileCode = 801
and TimeOfUse = 'UNR'
order by SettlementDate desc

---

通过当前执行，您可以从存储过程的执行中获得返回值，该值是一个整数

这里的一个选项是定义输出参数以从语句中检索值：

-- Stored procedure
CREATE PROCEDURE [GetLatestUsageFactor801UNR]
    @UsageFactor801UNR decimal(18, 10) OUTPUT
AS BEGIN
    select TOP 1 @UsageFactor801UNR = TotalUsageFactor
    from MarketMessage as a
    inner join messagetype591 as b on a.MarketMessageID = b.MarketMessageID
    inner join AdditionalAggregationInformation as c on b.MessageType591ID = c.MessageType591ID
    inner join AdditionalAggregationData as d on c.AdditionalAggregationInformationID = d.AdditionalAggregationInformationID
    where SettlementRunIndicator = 20
        and LoadProfileCode = 801
        and TimeOfUse = 'UNR'
    order by SettlementDate desc
END

-- Execution    
DECLARE @err int
DECLARE @UsageFactor801UNR decimal(18, 10)

EXECUTE @err = [GetLatestUsageFactor801UNR] @UsageFactor801UNR OUTPUT
IF @err = 0 BEGIN
    PRINT 'OK'
    PRINT @UsageFactor801UNR
    END
ELSE BEGIN
    PRINT 'Error'
END

另一个选项是将此存储过程的结果存储在表中。这样就不需要输出参数：

-- Stored procedure
CREATE PROCEDURE [GetLatestUsageFactor801UNR]
AS BEGIN
    select TOP 1 TotalUsageFactor AS UsageFactor801UNR
    from MarketMessage as a
    inner join messagetype591 as b on a.MarketMessageID = b.MarketMessageID
    inner join AdditionalAggregationInformation as c on b.MessageType591ID = c.MessageType591ID
    inner join AdditionalAggregationData as d on c.AdditionalAggregationInformationID = d.AdditionalAggregationInformationID
    where SettlementRunIndicator = 20
        and LoadProfileCode = 801
        and TimeOfUse = 'UNR'
    order by SettlementDate desc
END

-- Execution

DECLARE @UsageFactor801UNR decimal(18, 10)

CREATE TABLE #Temp (UsageFactor801UNR decimal(18, 10))
INSERT INTO #Temp (UsageFactor801UNR)
EXECUTE [GetLatestUsageFactor801UNR]

SELECT @UsageFactor801UNR = UsageFactor801UNR 
FROM #Temp

PRINT @UsageFactor801UNR

---

您使用的是SQL Server吗？您使用的是哪种数据库管理系统？（该代码是特定于产品的。）是的，使用SQL Server时，您应该知道存储过程返回int。如果您有

十进制（18,10）

，则必须是。如何指定输出参数？这是在变量声明中还是在被调用的存储过程中完成的？