Question

我的存储过程存在一些问题。

我正在尝试对照我的表GOTWVotes进行查找，如果VotedBy在将表决结果写入表之前尚未进行表决（这是可行的），但是如果VotedBy之前已经进行了表决不要写到表中并返回VoteCount为1。

尽管VotedBy存在时它不会写到表中，VoteCount的值总是看起来为0

任何帮助将不胜感激

CREATE PROCEDURE [dbo].[Votes]
    @VotedMember BIGINT,
    @VotedBy BIGINT

    AS
    DECLARE @votecount INT

    BEGIN TRY
    BEGIN TRANSACTION t_Transaction
    SELECT TOP 1 * FROM [GOTWVotes] WITH (TABLOCKX)

    SELECT @votecount = COUNT(*) FROM [dbo].[GOTWVotes] 
    WHERE [VotedBy] = @VotedBy
    IF @votecount = 0

    INSERT INTO 
        [dbo].[GOTWVotes] ([VotedMember],[VotedBy])
    VALUES
        (@VotedMember, @VotedBy)
    COMMIT TRANSACTION t_Transaction
    END TRY
    BEGIN CATCH
        SET @votecount = -1
        ROLLBACK TRANSACTION t_Transaction
    END CATCH
        RETURN @votecount

Answer 1

您可以执行以下代码

struct foo_type_b

要调用上述存储过程，您需要编写以下代码

CREATE PROCEDURE [dbo].[Votes]
    @VotedMember BIGINT,
    @VotedBy BIGINT,
    @votecount INT OUTPUT

    AS

    BEGIN TRY
    BEGIN TRANSACTION t_Transaction

    SET @votecount = 0
    IF NOT EXISTS(SELECT 1 FROM [dbo].[GOTWVotes] 
    WHERE [VotedBy] = @VotedBy)
    BEGIN
        INSERT INTO 
        [dbo].[GOTWVotes] ([VotedMember],[VotedBy])
    VALUES
        (@VotedMember, @VotedBy)        
    END
    ELSE
    BEGIN
        SELECT @votecount = COUNT(*) FROM [dbo].[GOTWVotes] 
    WHERE [VotedBy] = @VotedBy
    END


    COMMIT TRANSACTION t_Transaction
    END TRY
    BEGIN CATCH
        SET @votecount = -1
        ROLLBACK TRANSACTION t_Transaction
    END CATCH

Answer 2

这似乎太复杂了。我在想这样的事情：

CREATE PROCEDURE [dbo].[Votes] (
    @VotedMember BIGINT,
    @VotedBy BIGINT,
    @retval int output
) 
BEGIN

  INSERT INTO dbo.GOTWVotes (VotedMember, VotedBy)
    SELECT v.VotedMember, v.VotedBy
    FROM (VALUES (@VotedMember, @VotedBy)) v(VotedMember, VotedBy)
    WHERE NOT EXISTS (SELECT 1
                      FROM dbo.GOTWVotes gwv
                      WHERE gwv.VotedBy = v.VotedBy
                     );
  SET @retval = @@ROWCOUNT;
END;

我怀疑您想要做的事情也可能受到约束。

存储过程SQL-Server出现问题

2 个答案: