Question

您好我的存储过程有问题，我想插入三个表，我创建了一个存储的procdure来做到这一点，但我有这两个表名为wishlist和general。我想插入wishlist表，如果dateaquired行为null但我创建的脚本无论如何插入到表中，有人可以改进我的脚本，以便它不会插入到我的wishlist表中，如果我的日期表中的dateaquired行不是空的。

USE [MediaPlayer]
GO
/****** Object:  StoredProcedure [dbo].[CreateBooks]    Script Date: 12/03/2013 19:05:29 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO

ALTER PROCEDURE [dbo].[CreateBooks]

    -- Add the parameters for the stored procedure here
    @Name nvarchar (250),
    @FileName nvarchar (250),
    @FilePath  nvarchar (50),
    @FileSize float,
    @DateAdded date,
    @MediaLength nvarchar (50),
    @MediaSubType nvarchar(50),
    @MediaType nvarchar(50),
    @Thumbnail image,
    @DateAquired nvarchar(50),
    @BooksName nvarchar (50),
    @Publisher nvarchar(50),
    @Author nvarchar(50),
    @YearOfPublication date, 
    @Genre nvarchar(50),
    @ISBN nvarchar (50),
    @Synoposis nvarchar(50),
    @SeriesTitle nvarchar(50),
    @SeriesNumber nvarchar(50),
    @GeneralID int output,

    @BookID int output,
    @WishListID int output

AS
BEGIN
Insert into dbo.General
(Name, FileName, FilePath, FileSize, DateAdded, MediaLength,
MediaSubType, MediaType, Thumbnail, DateAquired)
values (@Name, @FileName, @FilePath, @FileSize, @DateAdded, @MediaLength, 
@MediaSubType, @MediaType, @Thumbnail, @DateAquired)

SET @GeneralID = @@IDENTITY     
insert into dbo.Book

(GeneralID, BooksName, Publisher, Author, [Year of publication], Genre,
 ISBN, Synoposis,[Series Title],[Series Number])
Values (IDENT_CURRENT('dbo.General'), @BooksName, @Publisher, @Author, @YearOfPublication, @Genre, 
@ISBN, @Synoposis, @SeriesTitle, @SeriesNumber)

SET @BookID = @@IDENTITY
 Select GeneralID, Name, FileName, FilePath,FileSize,DateAdded,MediaLength,MediaSubType,MediaType,   Thumbnail,DateAquired As Wishlist 
   From General where NULLIF(DateAquired,'')IS Null 
   Select * from WishLists
  select GeneralID, MediaSubType, Name
  From General where NOT EXISTS (Select Name from WishLists Where Name =@Name);
  insert into Wishlists (generalID ,MediaType, Name)
  values ((IDENT_CURRENT('dbo.General')),@MediaSubType, @Name)
  SET @WishListID = @@IDENTITY
  select * from wishlists

END

Answer 1

我可能错了，但对我来说，似乎你错过了一些逻辑案例。

您的代码：

Select GeneralID, Name, FileName, FilePath, FileSize, DateAdded,
MediaLength,MediaSubType,MediaType, Thumbnail, DateAquired As Wishlist 
From General where NULLIF(DateAquired,'')IS Null

这样做是从General中选择指定的字段，其中DateAcquired为Null。在旁注中，我相信（我可能错了）如果你想要所有这些字段作为愿望清单，你应该将它们全部放在括号中，如：

Select (GeneralID, Name, FileName, FilePath, FileSize, DateAdded,
MediaLength,MediaSubType,MediaType, Thumbnail, DateAquired) As Wishlist 
From General where NULLIF(DateAquired,'')IS Null

无论如何，一旦你掌握了这些数据，你就没有做任何事情，你正在进入一个新的选择查询，从Wishlists中选择*。然后，您再次从General中选择名称不在表中的位置。然后，您将向愿望列表中插入dbo.General，@ MediaSUbType，@ Name的当前标识值。

因此，所有这些代码实际上都在运行一些查询，然后不管这些结果如何，都将dbo.General的Identity值和状态值@MediaSubType和@Name插入到表wishlist中。为了使之前运行的所有查询对插入的内容产生影响，您需要使用案例。

我对表格和事情的了解不够，无法编写您需要的代码，但this answer应该让您了解如何使用CASE WHEN来做您需要的事情。

希望这有助于一些人，而不仅仅是来自我的无用的谣言。

Answer 2

如果您只是尝试跳过基于@DateAquired为空的WishList插入，您可以修改您的脚本，如下所示。如果这不是您想要的，请回复。

BEGIN

    Insert into dbo.General(Name, FileName, FilePath, FileSize, DateAdded, MediaLength, MediaSubType, MediaType, Thumbnail, DateAquired)
        values (@Name, @FileName, @FilePath, @FileSize, @DateAdded, @MediaLength, @MediaSubType, @MediaType, @Thumbnail, @DateAquired);

    SET @GeneralID = scope_identity(); --use this instead of @@IDENTITY

    insert into dbo.Book(GeneralID, BooksName, Publisher, Author, [Year of publication], Genre, ISBN, Synoposis,[Series Title],[Series Number])
        Values (@GeneralID, @BooksName, @Publisher, @Author, @YearOfPublication, @Genre, @ISBN, @Synoposis, @SeriesTitle, @SeriesNumber)

    SET @BookID = scope_identity(); --use this instead of @@IDENTITY


    -- you already have the DateAquired from the insert into dbo.General above, so just use the param @DateAquired
    if(@DateAquired is null)
    begin

        insert into Wishlists (generalID, MediaType, Name)
        values (@GeneralId, @MediaSubType, @Name)

        SET @WishListID = scope_identity(); --use this instead of @@IDENTITY
    end


    select [InsertedGeneralId] = @GeneralID, [InsertedBookID] = @BookID, [InsertedWishListID] = @WishListID

END

Answer 3

AS
BEGIN
        Insert into dbo.General
        (Name, FileName, FilePath, FileSize, DateAdded, MediaLength,
        MediaSubType, MediaType, Thumbnail, DateAquired)
        values (@Name, @FileName, @FilePath, @FileSize, @DateAdded, @MediaLength, 
        @MediaSubType, @MediaType, @Thumbnail, @DateAquired)

        SET @GeneralID = SCOPE_IDENTITY()  --<-- 

        insert into dbo.Book

        (GeneralID, BooksName, Publisher, Author, [Year of publication], Genre,
         ISBN, Synoposis,[Series Title],[Series Number])
        Values (IDENT_CURRENT('dbo.General'), @BooksName, @Publisher, @Author,
         @YearOfPublication, @Genre, @ISBN, @Synoposis, @SeriesTitle, @SeriesNumber)

        SET @BookID = SCOPE_IDENTITY()
         Select GeneralID, Name, FileName, FilePath,FileSize,DateAdded,MediaLength
                 ,MediaSubType,MediaType,   Thumbnail,DateAquired As Wishlist 
           From General where NULLIF(DateAquired,'')IS Null 
           Select * from WishLists

          select GeneralID, MediaSubType, Name
          From General where NOT EXISTS (Select Name from WishLists Where Name =@Name);

        IF (@DateAquired IS NULL)
        BEGIN
          insert into Wishlists (generalID ,MediaType, Name)
          values ((IDENT_CURRENT('dbo.General')),@MediaSubType, @Name)
          SET @WishListID = SCOPE_IDENTITY()
        END 

          select * from wishlists

END

同样使用SCOPE_IDENTITY()而不是@@IDENTITY，因为它将返回该列中的最后一个生成标识，即使它是由并发连接创建的。

如果record为null，则插入到一个表中

3 个答案: