将身份证的15位号码升级为18位

--===================================================================
--15位号码升级为18位
--===================================================================
Create FUNCTION [dbo].[ID15TO18] (@id15 char(15))
/*功能：将身份证的15位号码升级为18位


--
-- --调用函数
-- update
--     表
-- set
--     身份证号 = dbo.ID15TO18(身份证号)
-- where
--     LEN(身份证号) = 15
--
--
*/
RETURNS CHAR(18)
AS
BEGIN
    DECLARE @ID18 CHAR(18)
  
    DECLARE @S1 AS INTEGER
    DECLARE @S2 AS INTEGER
    DECLARE @S3 AS INTEGER
    DECLARE @S4 AS INTEGER
    DECLARE @S5 AS INTEGER
    DECLARE @S6 AS INTEGER
    DECLARE @S7 AS INTEGER
    DECLARE @S8 AS INTEGER
    DECLARE @S9 AS INTEGER
    DECLARE @S10 AS INTEGER
    DECLARE @S11 AS INTEGER
    DECLARE @S12 AS INTEGER
    DECLARE @S13 AS INTEGER
    DECLARE @S14 AS INTEGER
    DECLARE @S15 AS INTEGER
    DECLARE @S16 AS INTEGER
    DECLARE @S17 AS INTEGER
    DECLARE @S18 AS INTEGER
  
    SET @S1=SUBSTRING(@ID15,1,1)
    SET @S2=SUBSTRING(@ID15,2,1)
    SET @S3=SUBSTRING(@ID15,3,1)
    SET @S4=SUBSTRING(@ID15,4,1)
    SET @S5=SUBSTRING(@ID15,5,1)
    SET @S6=SUBSTRING(@ID15,6,1)
    SET @S7=1
    SET @S8=9
    SET @S9=SUBSTRING(@ID15,7,1)
    SET @S10=SUBSTRING(@ID15,8,1)
    SET @S11=SUBSTRING(@ID15,9,1)
    SET @S12=SUBSTRING(@ID15,10,1)
    SET @S13=SUBSTRING(@ID15,11,1)
    SET @S14=SUBSTRING(@ID15,12,1)
    SET @S15=SUBSTRING(@ID15,13,1)
    SET @S16=SUBSTRING(@ID15,14,1)
    SET @S17=SUBSTRING(@ID15,15,1)
  
    SET @S18=((@S1*7)+(@S2*9)+(@S3*10)+(@S4*5)+(@S5*8)+(@S6*4)+(@S7*2)+(@S8*1)
        +(@S9*6)+(@S10*3)+(@S11*7)+(@S12*9)+(@S13*10)+(@S14*5)+(@S15*8)+(@S16
        *4)+(@S17*2))%11
  
    SET @ID18=SUBSTRING(@ID15,1,6)+'19'+SUBSTRING(@ID15,7,9)
        +CASE WHEN @S18=0 THEN '1'
              WHEN @S18=1 THEN '0'
              WHEN @S18=2 THEN 'X'
              WHEN @S18=3 THEN '9'
              WHEN @S18=4 THEN '8'
              WHEN @S18=5 THEN '7'
              WHEN @S18=6 THEN '6'
              WHEN @S18=7 THEN '5'
              WHEN @S18=8 THEN '4'
              WHEN @S18=9 THEN '3'
              WHEN @S18=10 THEN '2'
         END
  
    RETURN @ID18
END