Question

我有一点问题，但不知道解决方案！

我写了一个存储过程。这不是必要的功能。

我想从Type int声明一个Variable。

此变量必须获取SQL查询的值。

我的尝试：

DECLARE @ParentServiceProviderId int = null     
SET @ParentServiceProviderId  = (SELECT ParentServiceProviderId 
                                 FROM ServiceProvider
                                 WHERE ServiceProviderId = @ServiceProviderId)

它不起作用！ Query的ResultSet每次都有一行！

我不知道如何解决这个问题！

以下是完整的存储过程：

ALTER PROCEDURE [dbo].[InsertCarmakerPartnership_ChildToParent]

    @ServiceProviderId int,
    @CarmakerId int,
    @ValidFrom datetime,
    @ValidTo datetime
AS
BEGIN
    -- SET NOCOUNT ON added to prevent extra result sets from
    -- interfering with SELECT statements.
    SET NOCOUNT ON;

    DECLARE @parentSPPId int, @parentSPPParentId int, @superParentId int, @ParentServiceProviderId int = null       

    SET @ParentServiceProviderId  = (SELECT ParentServiceProviderId 
                                     FROM ServiceProvider
                                     WHERE ServiceProviderId = @ServiceProviderId)      

    DECLARE ServiceProviderParent_Cursor CURSOR FOR

    SELECT ServiceProviderId, ParentServiceProviderId
    FROM ServiceProvider 
    WHERE ServiceProviderId = @ParentServiceProviderId

    OPEN ServiceProviderParent_Cursor;

    FETCH NEXT FROM ServiceProviderParent_Cursor INTO @parentSPPId, @parentSPPParentId 

    IF (@ParentServiceProviderId is NULL)
    BEGIN
        SET @superParentId = @ServiceProviderId
        EXEC InsertCarmakerPartnership_ParentToChild @superParentId, @CarmakerId, @ValidFrom, @ValidTo;
    END

    WHILE @@FETCH_STATUS = 0
BEGIN
    IF @ServiceProviderId > 0
    BEGIN
        EXEC InsertCarmakerPartnership_ChildToParent @parentSPPId, @CarmakerId, @parentSPPParentId, @ValidFrom, @ValidTo  ;

        IF (SELECT COUNT(*) FROM dbo.CarmakerPartnership WHERE ServiceProviderId = @parentSPPId AND CarmakerId = @CarmakerId AND IsDeleted = 0) = 0
        BEGIN                           
            INSERT INTO dbo.CarmakerPartnership (CarmakerId, ServiceProviderId, CreatedBy, ChangedBy, ValidityPeriodFrom, ValidityPeriodTo) VALUES (@CarmakerId, @parentSPPId, SYSTEM_USER, SYSTEM_USER, @ValidFrom, @ValidTo)
        END             
    END 
    FETCH NEXT FROM ServiceProviderParent_Cursor INTO @parentSPPId, @parentSPPParentId 
END;
    CLOSE ServiceProviderParent_Cursor;
    DEALLOCATE ServiceProviderParent_Cursor;
END

感谢您的帮助，抱歉我的英语不好！

最好的问候。

Answer 1

无论如何，使用下一个代码来填充变量：

DECLARE @ParentServiceProviderId int

SELECT @ParentServiceProviderId = ParentServiceProviderId 
FROM ServiceProvider
WHERE ServiceProviderId = @ServiceProviderId

Answer 2

不要为此变量指定默认值，其余代码为：

DECLARE @ParentServiceProviderId int

SELECT @ParentServiceProviderId = ParentServiceProviderId 
                                FROM ServiceProvider
                                WHERE ServiceProviderId = @ServiceProviderId

存储过程使用查询的ResultSet填充变量

2 个答案: