PadLeft 和 PadRight

1 PadLeft

   即：向已知字符串左边补充字符，使整个字符串到达指定长度

 1 CREATE FUNCTION PadLeft

 2 (

 3     @VarOrgan varchar(10),/*原始字符*/

 4     @TotalLength int,/*总长度*/

 5     @Placeholder varchar(1)/*占位符*/

 6 )

 7 RETURNS varchar(100)

 8 AS

 9 BEGIN

10     declare @VarNew varchar(100),

11             @PadLen int

12     SET @VarNew=@VarOrgan

13     SET @PadLen=@TotalLength-LEN(@VarOrgan)

14     while(@PadLen>0)

15         begin

16             select @VarNew=@Placeholder+@VarNew

17             set @PadLen=@PadLen-1

18         end

19     return @VarNew

20 END

 

2 PadRight

   即：向已知字符串右边补充字符，使整个字符串到达指定长度

 1 CREATE FUNCTION PadRight

 2 (

 3     @VarOrgan varchar(10),/*原始字符*/

 4     @TotalLength int,/*总长度*/

 5     @Placeholder varchar(1)/*占位符*/

 6 )

 7 RETURNS varchar(100)

 8 AS

 9 BEGIN

10     declare @VarNew varchar(100),

11             @PadLen int

12     SET @VarNew=@VarOrgan

13     SET @PadLen=@TotalLength-LEN(@VarOrgan)

14     while(@PadLen>0)

15         begin

16             select @VarNew=@VarNew+@Placeholder

17             set @PadLen=@PadLen-1

18         end

19     return @VarNew

20 END

 

3 测试结果

SELECT dbo.PadLeft('7',6,'0') PadLeft,

        dbo.PadRight('6',4,'0') PadRight