插入两个表并影响其中一个表列的ID到另一个表中

Question

I have a Folder table which contain the following colomuns

id    | name       | state    | imageFolder                
-------------------------------------------
1        NameTest       1           2 

And i have another one called Images which contain

  id    | url                     
  --------------------------------------------
    2     https://www.someImageUrl

I want to insert an url in the folder table in a query and put it in the images and get the id in the same query. Actually, i am working an android project, i have to add a new folder and upload an image to it so that's why i'm in need of this. Is there a way to do it ??

Answer 1

You'll want to use SCOPE_IDENTITY() to capture the key value being generated by the IMAGE table. Some people use @@IDENTITY , do not do that, it has a global scope and you can sometimes get back the wrong ID.

Then use that value to insert into the FOLDER table. It feels a little backwards to insert into the IMAGE table first but that's how you get the ID you want. Here is a fully functional example:

IF OBJECT_ID('IMAGE') IS NOT NULL
    DROP TABLE [IMAGE]

CREATE TABLE [dbo].[IMAGE](
    [id] [int] IDENTITY(1,1) NOT NULL,
    [url] [varchar](50) NOT NULL,
 CONSTRAINT [PK_IMAGE] PRIMARY KEY CLUSTERED 
(
    [id] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
GO

IF OBJECT_ID('FOLDER') IS NOT NULL
    DROP TABLE [FOLDER]

CREATE TABLE [dbo].[FOLDER](
    [id] [int] IDENTITY(1,1) NOT NULL,
    [name] [varchar](50) NOT NULL,
    [state] [int] NOT NULL,
    [image_id] [int] NOT NULL,
 CONSTRAINT [PK_FOLDER] PRIMARY KEY CLUSTERED 
(
    [id] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]

GO

DECLARE @IMAGE_ID INT

INSERT INTO IMAGE(url)
VALUES ('http://www.example.com')

SET @IMAGE_ID = SCOPE_IDENTITY()  --This is the key part

INSERT INTO FOLDER(NAME, STATE, IMAGE_ID)
VALUES ('NameTest', 1, @IMAGE_ID)

GO

SELECT * FROM IMAGE
SELECT * FROM FOLDER

Results: