原文:
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
