sql server 随机生成22位主键ID

ALTER FUNCTION [dbo].[ufn_GenerateUniqueID]
(
@LengthNo int = 22,
@RandomNum int = 0
)
RETURNS varchar(30)
WITH EXEC AS CALLER
AS
BEGIN
-- 返回值
DECLARE @RetValue VARCHAR(50)
DECLARE @DatetimeString VARCHAR(14)
DECLARE @randomString VARCHAR(50)

Select @DatetimeString = CONVERT(VARCHAR(8), getdate(), 112) + replace(CONVERT(VARCHAR(8), getdate(), 114), ‘:‘,‘‘)
SET @randomString = Right(Replicate(‘0‘,@LengthNo - 14) + CAST(@RandomNum AS VARCHAR(10)), @LengthNo - 14)

SET @RetValue = @DatetimeString + @randomString

--返回
RETURN @RetValue
END