--创建函数(该函数来自csdn，作者不详)
create function [dbo].[padleft]
(
@str varchar(50), --需要填充的字符串
@totalwidth int, --填充后的长度
@paddingchar char(1)--填充使用的字符
)
returns varchar(1000) as
begin
declare @s varchar(100)
set @s = @str
if ( len(@str) < @totalwidth)
begin
declare @i int
declare @strlen int
declare @temp varchar(100)
set @i = 1;
set @strlen = @totalwidth - len(@str)
set @temp = '';
while(@i <= @strlen )
begin
set @temp = @temp + @paddingchar;
set @i = @i + 1;
end
set @s = @temp + @str
end
return (@s)
end
go
--测试示例
declare @table table (id nvarchar(20))
insert into @table
select '1' union all
select '2' union all
select '3' union all
select '4' union all
select '5' union all
select '6'
select dbo.padleft(id,2,'0') as id from @table
--运行结果
/*
id
-------
01
02
03
04
05
06
*/
go
--创建函数(第二版)(作者：maco_wang)
create function padleftV2
(
@sql varchar(200), --需填充的字符串
@char varchar(4), --填充使用的字符
@len int --填充后的长度
)
returns varchar(200)
as
begin
return (right(replicate(@char,@len)+@sql,@len))
end
go
--测试示例
declare @table table(id int)
insert into @table(id)
select 1 union all
select 3 union all
select 6
select dbo.padleftV2(cast(id as varchar),'0',10) as id from @table
--运行结果
/*
id
-------------
0000000001
0000000003
0000000006
*/