Question

我有一个存储过程，InsertNewFlag这个存储过程工作，检查指定的条件记录是否存在upadte表有多个（If..Else If），如果不存在那个表插入查询执行。

这里我包含了这个存储过程代码：

set ANSI_NULLS ON
set QUOTED_IDENTIFIER ON
GO

ALTER PROCEDURE [dbo].[InsertNewFlag]
(
    @IsRead bit = NULL,
    @IsImportant bit = NULL,
    @IsTrashed bit = NULL,
    @IsRemoved bit = NULL,
    @User_id int,
    @Post_History_id int,
    @NewID int output
)
AS
BEGIN
    IF EXISTS(SELECT * FROM [FileSystem].[dbo].[tbl_Post_History_Status] WHERE(User_id=@User_id AND Post_History_id=@Post_History_id))
    BEGIN
     IF @IsRead <> NULL
        BEGIN
        UPDATE [FileSystem].[dbo].[tbl_Post_History_Status]
        SET [IsRead] = @IsRead
            ,[User_id] = @User_id
            ,[Post_History_id] = @Post_History_id
        WHERE (User_id=@User_id AND Post_History_id=@Post_History_id)
        SET @NewID = CAST(SCOPE_IDENTITY() AS INT)
        END
    ELSE IF @IsImportant <> NULL
        BEGIN
        UPDATE [FileSystem].[dbo].[tbl_Post_History_Status]
        SET [IsImportant] = @IsImportant
            ,[User_id] = @User_id
            ,[Post_History_id] = @Post_History_id
        WHERE (User_id=@User_id AND Post_History_id=@Post_History_id)
        SET @NewID = CAST(SCOPE_IDENTITY() AS INT)
        END
    ELSE IF @IsTrashed <> NULL
        BEGIN
        UPDATE [FileSystem].[dbo].[tbl_Post_History_Status]
        SET [IsTrashed] = @IsTrashed
            ,[User_id] = @User_id
            ,[Post_History_id] = @Post_History_id
        WHERE (User_id=@User_id AND Post_History_id=@Post_History_id)
        SET @NewID = CAST(SCOPE_IDENTITY() AS INT)
        END
    ELSE IF @IsRemoved <> NULL
        BEGIN
        UPDATE [FileSystem].[dbo].[tbl_Post_History_Status]
        SET [IsRemoved] = @IsRemoved
            ,[User_id] = @User_id
            ,[Post_History_id] = @Post_History_id
        WHERE (User_id=@User_id AND Post_History_id=@Post_History_id)
        SET @NewID = CAST(SCOPE_IDENTITY() AS INT)
        END
    END
    ELSE
        BEGIN
            INSERT INTO [FileSystem].[dbo].[tbl_Post_History_Status]
               ([IsRead]
               ,[IsImportant]
               ,[IsTrashed]
               ,[IsRemoved]
               ,[User_id]
               ,[Post_History_id])
            VALUES
               (@IsRead,@IsImportant,@IsTrashed,@IsRemoved,@User_id,@Post_History_id)
            SET @NewID = CAST(SCOPE_IDENTITY() AS INT)
        END
END

这个存储过程在语法上是否正确，并显示“命令已成功完成”等消息。但是当我执行这个存储过程并将值@IsRead传递给True并将@User_id传递给1而将@Post_History_id传递给9时，如果存在则记录不会更新。

记录如何存在。

请帮帮我..

Answer 1

将所有空检查替换为此类

IF Not @IsRead Is Null --Instead of IF @IsRead <> NULL
BEGIN
  .....Other CODE
END

ELSE IF Not @IsImportant  Is Null --Instead of ELSE IF @IsImportant <> NULL
BEGIN
 .....and SO ON

Answer 2

试试这个，

 UPDATE [FileSystem].[dbo].[tbl_Post_History_Status]
SET
     [IsRead] =(CASE WHEN NOT @IsRead IS NULL THEN @IsRead ELSE [IsRead] END),
     [IsImportant] =(CASE WHEN NOT @IsImportant IS NULL THEN @IsImportant ELSE [IsImportant] END),
     [IsTrashed] =(CASE WHEN NOT @IsTrashed IS NULL THEN @IsTrashed ELSE [IsTrashed] END),
     [IsRemoved] =(CASE WHEN NOT @IsRemoved IS NULL THEN @IsRemoved ELSE [IsRemoved] END),
     [User_id] = @User_id,
     [Post_History_id] =@Post_History_id
WHERE (User_id=@User_id AND Post_History_id=@Post_History_id)

Answer 3

尝试

ALTER PROCEDURE [dbo].[InsertNewFlag]
(
    @IsRead bit = NULL,
    @IsImportant bit = NULL,
    @IsTrashed bit = NULL,
    @IsRemoved bit = NULL,
    @User_id int,
    @Post_History_id int,
    @NewID int output
)
AS
BEGIN

    Declare @Cnt Int
    SET @Cnt = 0

    SELECT Top 1 @Cnt = ID FROM [FileSystem].[dbo].[tbl_Post_History_Status] WHERE(User_id=@User_id AND Post_History_id=@Post_History_id) 

    IF @Cnt > 0
    BEGIN

     SET @NewID = @Cnt

     IF Not @IsRead Is Null
        BEGIN
        UPDATE [FileSystem].[dbo].[tbl_Post_History_Status]
        SET [IsRead] = @IsRead
            ,[User_id] = @User_id
            ,[Post_History_id] = @Post_History_id
        WHERE (User_id=@User_id AND Post_History_id=@Post_History_id)
        --SET @NewID = CAST(SCOPE_IDENTITY() AS INT)
        END
    ELSE IF Not @IsImportant Is Null
        BEGIN
        UPDATE [FileSystem].[dbo].[tbl_Post_History_Status]
        SET [IsImportant] = @IsImportant
            ,[User_id] = @User_id
            ,[Post_History_id] = @Post_History_id
        WHERE (User_id=@User_id AND Post_History_id=@Post_History_id)
        --SET @NewID = CAST(SCOPE_IDENTITY() AS INT)
        END
    ELSE IF Not @IsTrashed Is Null
        BEGIN
        UPDATE [FileSystem].[dbo].[tbl_Post_History_Status]
        SET [IsTrashed] = @IsTrashed
            ,[User_id] = @User_id
            ,[Post_History_id] = @Post_History_id
        WHERE (User_id=@User_id AND Post_History_id=@Post_History_id)
        --SET @NewID = CAST(SCOPE_IDENTITY() AS INT)
        END
    ELSE IF Not @IsRemoved Is Null
        BEGIN
        UPDATE [FileSystem].[dbo].[tbl_Post_History_Status]
        SET [IsRemoved] = @IsRemoved
            ,[User_id] = @User_id
            ,[Post_History_id] = @Post_History_id
        WHERE (User_id=@User_id AND Post_History_id=@Post_History_id)
        --SET @NewID = CAST(SCOPE_IDENTITY() AS INT)
        END
    END
    ELSE
        BEGIN
            INSERT INTO [FileSystem].[dbo].[tbl_Post_History_Status]
               ([IsRead]
               ,[IsImportant]
               ,[IsTrashed]
               ,[IsRemoved]
               ,[User_id]
               ,[Post_History_id])
            VALUES
               (@IsRead,@IsImportant,@IsTrashed,@IsRemoved,@User_id,@Post_History_id)
            --SET @NewID = CAST(SCOPE_IDENTITY() AS INT)
            SET @NewID = @@IDENTITY
        END
END

如何使用多个if..else语句更新表

3 个答案: