Question

全部，我想根据从另一个表获得的当前最大值开始IDENTITY字段的编号。所以我尝试了类似下面的内容

DECLARE @CurrentES INT;
SET @CurrentES = (SELECT MaxES 
                  FROM [NDB]..[TmpMaxES]) + 1;
ALTER TABLE BA 
ADD ES INT IDENTITY(@CurrentES, 1);

但是这不会接受变量作为IDENTITY中的种子值。如何实现我的目标？

感谢您的时间。

Answer 1

执行此操作和其他非变量允许的任务，可以使用EXEC功能，如下所示：

DECLARE @CurrentES INT;
SET @CurrentES = (SELECT MaxES 
                  FROM [NDB]..[TmpMaxES]) + 1;

DECLARE @Statement VARCHAR(200)

SET @Statement = 'ALTER TABLE BA 
ADD ES INT IDENTITY(' + CAST(@CurrentES AS VARCHAR) + ', 1);'

EXEC (@Statement)

Answer 2

您可以使用SQL Server的dbcc checkident功能...

DECLARE @MAXID INT
SELECT @MAXID = MAX(ID_FIELD) FROM OLDTABLE
dbcc checkident(NEWTABLE, reseed, @MAXID)

有一点值得注意的是，第3个参数（在本例中为@MAXID变量）中的值表示当前标识值 - 换句话说，最后一个标识值是在桌子上生成的。

因此，例如，如果您希望自动创建的下一个值为100，请将第三个参数设置为99。

Answer 3

尝试这样的事情......

SET IDENTITY_INSERT [MyTable] ON
INSERT INTO [MyTable] ... (MAX) Value from another table and other applicable record.
...
SET IDENTITY_INSERT [MyTable] OFF

Answer 4

--first variable 
    declare @code varchar(50);
    set @code=1345688867567576;
--second variable
    declare @namedb varchar(50);
    set @namedb='test';
--let's you add to the identity(ID) field           
    SET IDENTITY_INSERT dbo.nameAndroid ON
--declaring variable to hold the next id number
    declare @id int;
    set @id=@@IDENTITY +1;
--clause to check if the table has the matching barcode 
    if not exists (select * from dbo.nameAndroid where barcode = @code)
    INSERT INTO dbo.nameAndroid (id, name, barcode, [floor], Column1,Column2,Row1,Row2,Shelf,Stock,OnOrder)
    VALUES ( @id,@namedb, @code, 'Value3', 'Value4','Value5','Value6','Value7','Value8',123,600);

    SET IDENTITY_INSERT dbo.nameAndroid OFF;

OR（如果id列的类型为int）

    declare @code varchar(50);
    set @code='123211';

    declare @namedb varchar(50);
    set @namedb='test';

    declare @floordb varchar(50);
    set @floordb='test';

    declare @Column1db varchar(50);
    set @Column1db='test';

    declare @Column2db varchar(50);
    set @Column2db='test';

    declare @Row1db varchar(50);
    set @Row1db='test';

    declare @Row2db varchar(50);
    set @Row2db='test';

    declare @Shelfdb varchar(50);
    set @Shelfdb='test';

    declare @OnOrderdb decimal(18,2);
    set @OnOrderdb=10010;

    declare @Stockdb decimal(18,2);
    set @Stockdb=1010101;

    declare @id int;
   set @id=((select max(id) from dbo.nameAndroid )+1);



if not exists (select * from dbo.nameAndroid where barcode = @code)

  begin
SET IDENTITY_INSERT dbo.nameAndroid ON;

    INSERT INTO dbo.nameAndroid (id, name, barcode, [floor], Column1,Column2,Row1,Row2,Shelf,Stock,OnOrder)
    VALUES (@id, @namedb, @code, @floordb, @Column1db,@Column2db,@Row1db,@Row2db,@Shelfdb,@OnOrderdb,@Stockdb);

SET IDENTITY_INSERT dbo.nameAndroid OFF;
end

SQL Set IDENTITY字段使用变量

4 个答案: