欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页  >  IT编程

SQL Server 提取数字、提取英文、提取中文的sql语句

程序员文章站 2023-01-03 17:09:10
--sql 判断字段值是否有中文 create function fun_getcn(@str nvarchar(4000)) returns nvarch...
--sql 判断字段值是否有中文
create function fun_getcn(@str nvarchar(4000))  
returns nvarchar(4000)  
 as  
 begin  
 declare @word nchar(1),@cn nvarchar(4000)  
 set @cn=''  
 while len(@str)>0  
 begin  
 set @word=left(@str,1)  
 if unicode(@word) between 19968 and 19968+20901 
   set @cn=@cn+@word
 set @str=right(@str,len(@str)-1)  
 end  
 return @cn  
 end  
select dbo.fun_getcn('asdkg论坛kdl')
--论坛
select dbo.fun_getcn('asdkg論壇kdl')
--論壇
select dbo.fun_getcn('asdkdl')
--空

-------------------------------------
--提取数字
if object_id('dbo.get_number2') is not null
drop function dbo.get_number2
go
create function dbo.get_number2(@s varchar(100))
returns varchar(100)
as
begin
while patindex('%[^0-9]%',@s) > 0
begin
set @s=stuff(@s,patindex('%[^0-9]%',@s),1,'')
end
return @s
end
go
--测试
print dbo.get_number('呵呵abc123abc')
go
--123

--------------------------------------------------------------------
--提取英文
if object_id('dbo.get_str') is not null
drop function dbo.get_str
go
create function dbo.get_str(@s varchar(100))
returns varchar(100)
as
begin
while patindex('%[^a-z]%',@s) > 0
begin
set @s=stuff(@s,patindex('%[^a-z]%',@s),1,'')
end
return @s
end
go
--测试
print dbo.get_str('呵呵abc123abc')
go

--------------------------------------------------------------------
--提取中文
if object_id('dbo.china_str') is not null
drop function dbo.china_str
go
create function dbo.china_str(@s nvarchar(100))
returns varchar(100)
as
begin
while patindex('%[^吖-座]%',@s) > 0
set @s = stuff(@s,patindex('%[^吖-座]%',@s),1,n'')
return @s
end
go
print dbo.china_str('呵呵abc123abc')
go

--------------------------------------------------------------------
--过滤重复字符
if object_id('dbo.distinct_str') is not null
drop function dbo.distinct_str
go
create function dbo.distinct_str(@s nvarchar(100),@split varchar(50))
returns varchar(100)
as
begin
if @s is null return(null)
declare @new varchar(50),@index int,@temp varchar(50)
if left(@s,1)<>@split
set @s = @split+@s
if right(@s,1)<>@split
set @s = @s+@split
while charindex(@split,@s)>0 and len(@s)<>1
begin
set @index = charindex(@split,@s)
set @temp = left(@s,charindex(@split,@s,@index+len(@split)))
if @new is null 
set @new = isnull(@new,'')+@temp
else
set @new = isnull(@new,'')+replace(@temp,@split,'')+@split
while charindex(@temp,@s)>0
begin
set @s=stuff(@s,charindex(@temp,@s)+len(@split),charindex(@split,@s,charindex(@temp,@s)+len(@split))-charindex(@temp,@s),'')
end
end
return right(left(@new,len(@new)-1),len(left(@new,len(@new)-1))-1)
end
go
print dbo.distinct_str('a,a,b,c,c,b,c,',',')
--a,b,c
go

--------------------------------------------------------------------
--过滤重复字符2
if object_id('dbo.distinct_str2') is not null
drop function dbo.distinct_str2
go
create function dbo.distinct_str2(@s varchar(8000))
returns varchar(100)
as
begin
if @s is null return(null)
declare @new varchar(50),@index int,@temp varchar(50)
while len(@s)>0
begin
set @new=isnull(@new,'')+left(@s,1)
set @s=replace(@s,left(@s,1),'')
end
return @new
end
go
select dbo.distinct_str2('aabccd')
--abcd
go

--------------------------------------------------------------------
if object_id('dbo.split_str') is not null
drop function dbo.split_str
go
create function dbo.split_str(
@s varchar(8000),   --包含多个数据项的字符串
@index int,       --要获取的数据项的位置
@split varchar(10)   --数据分隔符
)
returns varchar(100)
as
begin
if @s is null return(null)
declare @splitlen int
select @splitlen=len(@split+'a')-2
while @index>1 and charindex(@split,@s+@split)>0
select @index=@index-1,@s=stuff(@s,1,charindex(@split,@s+@split)+@splitlen,'')
return(isnull(left(@s,charindex(@split,@s+@split)-1),''))
end
go
print dbo.split_str('aa|bb|cc',2,'|')
--
go