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declare @a varchar(8000)
set @a='张三,李四,王五,马六,xx,yy'
set @a='select ''' + replace(@a,',',''',''') + ''''
exec (@a)
declare @a varchar(8000)
set @a='张三,李四,王五,马六,xx,yy'
set @a='select ''' + replace(@a,',',''',''') + ''''
drop table t
declare @a varchar(8000)
set @a='张三,李四,王五,马六'
create table t(a varchar(20),b varchar(20),c varchar(20),d varchar(20))
set @a='select ''' + replace(@a,',',''',''') + ''''
exec('insert t ' + @a)
select * from t
drop table t
if object_id('tb') is not null
drop table tb
go
create table tb(a varchar(10),b varchar(10),c varchar(10),d varchar(10))
go
declare @a varchar(30)
set @a='张三,李四,王五,马六'
set @a=replace(@a,',','.')
insert into tb (a,b,c,d) select parsename(@a,4),parsename(@a,3),parsename(@a,2),parsename(@a,1)
go
select * from tb
declare @a varchar(30)
set @a='张三,李四,王五,马六'
select A = PARSENAME(replace(@a,',','.'),4) ,
B = PARSENAME(replace(@a,',','.'),3) ,
C = PARSENAME(replace(@a,',','.'),2) ,
D = PARSENAME(replace(@a,',','.'),1)
/*
A B C D
-------- ------- -------- ----
张三 李四 王五 马六
(所影响的行数为 1 行)
*/
/*
标题:分解字符串并查询相关数据
作者:爱新觉罗.毓华
时间:2008-03-18
地点:广东深圳
说明:通过使用函数等方法分解字符串查询相关数据。
问题:通过分解一个带某种符号分隔的字符串在数据库中查找相关数据。
例如 @str = '1,2,3',查询下表得到记录1,4,5,6
ID TypeID
1 1,2,3,4,5,6,7,8,9,10,11,12
2 2,3
3 3,7,8,9
4 2,6
5 4,5
6 6,7
*/
-----------------------------
create table tb (ID int , TypeID varchar(30))
insert into tb values(1 , '1,2,3,4,5,6,7,8,9,10,11,12')
insert into tb values(2 , '2,3')
insert into tb values(3 , '3,7,8,9')
insert into tb values(4 , '2,6')
insert into tb values(5 , '4,5')
insert into tb values(6 , '6,7')
go
-----------------------------
--如果仅仅是一个,如@str = '1'.
declare @str as varchar(30)
set @str = '1'
select * from tb where charindex(',' + @str + ',' , ',' + TypeID + ',') > 0
select * from tb where ',' + TypeID + ',' like '%,' + @str + ',%'
/*
ID TypeID
----------- ------------------------------
1 1,2,3,4,5,6,7,8,9,10,11,12
(所影响的行数为 1 行)
*/
-----------------------------
--如果包含两个,如@str = '1,2'.
declare @str as varchar(30)
set @str = '1,2'
select * from tb where charindex(',' + left(@str , charindex(',' , @str) - 1) + ',' , ',' + typeid + ',') > 0 or
charindex(',' + substring(@str , charindex(',' , @str) + 1 , len(@str)) + ',' , ',' + typeid + ',') > 0
select * from tb where ',' + typeid + ',' like '%,' + left(@str , charindex(',' , @str) - 1) + ',%' or
',' + typeid + ',' like '%,' + substring(@str , charindex(',' , @str) + 1 , len(@str)) + ',%'
/*
ID TypeID
----------- ------------------------------
1 1,2,3,4,5,6,7,8,9,10,11,12
2 2,3
4 2,6
(所影响的行数为 3 行)
*/
-------------------------------------------
--如果包含三个或四个,用PARSENAME函数来处理.
declare @str as varchar(30)
set @str = '1,2,3,4'
select * from tb where
charindex(',' + parsename(replace(@str , ',' , '.') , 4) + ',' , ',' + typeid + ',') > 0 or
charindex(',' + parsename(replace(@str , ',' , '.') , 3) + ',' , ',' + typeid + ',') > 0 or
charindex(',' + parsename(replace(@str , ',' , '.') , 2) + ',' , ',' + typeid + ',') > 0 or
charindex(',' + parsename(replace(@str , ',' , '.') , 1) + ',' , ',' + typeid + ',') > 0
select * from tb where
',' + typeid + ',' like '%,' + parsename(replace(@str , ',' , '.') , 4) + ',%' or
',' + typeid + ',' like '%,' + parsename(replace(@str , ',' , '.') , 3) + ',%' or
',' + typeid + ',' like '%,' + parsename(replace(@str , ',' , '.') , 2) + ',%' or
',' + typeid + ',' like '%,' + parsename(replace(@str , ',' , '.') , 1) + ',%'
/*
ID TypeID
----------- ------------------------------
1 1,2,3,4,5,6,7,8,9,10,11,12
2 2,3
3 3,7,8,9
4 2,6
5 4,5
(所影响的行数为 5 行)
*/
---------------------------------------
--如果超过四个,则只能使用函数或动态SQL来分解并查询数据。
/*
名称:fn_split函数.
功能:实现字符串分隔功能的函数
*/
create function dbo.fn_split(@inputstr varchar(8000), @seprator varchar(10))
returns @temp table (a varchar(200))
as
begin
declare @i int
set @inputstr = rtrim(ltrim(@inputstr))
set @i = charindex(@seprator , @inputstr)
while @i >= 1
begin
insert @temp values(left(@inputstr , @i - 1))
set @inputstr = substring(@inputstr , @i + 1 , len(@inputstr) - @i)
set @i = charindex(@seprator , @inputstr)
end
if @inputstr <> '\'
insert @temp values(@inputstr)
return
end
go
--调用
declare @str as varchar(30)
set @str = '1,2,3,4,5'
select distinct m.* from tb m,
(select * from dbo.fn_split(@str,',')) n
where charindex(',' + n.a + ',' , ',' + m.typeid + ',') > 0
drop table tb
drop function dbo.fn_split
/*
ID TypeID
----------- ------------------------------
1 1,2,3,4,5,6,7,8,9,10,11,12
2 2,3
3 3,7,8,9
4 2,6
5 4,5
(所影响的行数为 5 行)
*/
------------------------------------------
--使用动态SQL的语句。
declare @str varchar(200)
declare @sql as varchar(1000)
set @str = '1,2,3,4,5'
set @sql = 'select ''' + replace(@str , ',' , ''' as id union all select ''')
set @sql = @sql + ''''
set @sql = 'select distinct a.* from tb a , (' + @sql + ') b where charindex(' + ''','' + b.id + ' + ''',''' + ' , ' + ''','' + a.typeid + ' + ''',''' + ') > 0 '
exec (@sql)
/*
ID TypeID
----------- ------------------------------
1 1,2,3,4,5,6,7,8,9,10,11,12
2 2,3
3 3,7,8,9
4 2,6
5 4,5
(所影响的行数为 5 行)
*/