SQL存储过程给变量赋值

[jack4238]

declare @str nvarchar(max)
declare @tem int


set @str=' and type=1 or sort>20 '
set @tem=select sum(id) from order where +@str+ and Pid=20


提示报错，请高手指教？

[dawugui]

动态语句?看最后一段.
--动态sql语句基本语法

 
1 :普通SQL语句可以用Exec执行 

eg: Select * from tableName 
Exec('select * from tableName') 
Exec sp_executesql N'select * from tableName' -- 请注意字符串前一定要加N 

2:字段名，表名，数据库名之类作为变量时，必须用动态SQL 

eg: 
declare @fname varchar(20) 
set @fname = 'FiledName' 
Select @fname from tableName -- 错误,不会提示错误，但结果为固定值FiledName,并非所要。 
Exec('select ' + @fname + ' from tableName') -- 请注意 加号前后的 单引号的边上加空格 

当然将字符串改成变量的形式也可 
declare @fname varchar(20) 
set @fname = 'FiledName' --设置字段名 

declare @s varchar(1000) 
set @s = 'select ' + @fname + ' from tableName' 
Exec(@s) -- 成功 
exec sp_executesql @s -- 此句会报错 

declare @s Nvarchar(1000) -- 注意此处改为nvarchar(1000) 
set @s = 'select ' + @fname + ' from tableName' 
Exec(@s) -- 成功 
exec sp_executesql @s -- 此句正确 

3. 输出参数 
declare @num int, 
@sqls nvarchar(4000) 
set @sqls='select count(*) from tableName' 
exec(@sqls) 
--如何将exec执行结果放入变量中？ 

declare @num int, 
@sqls nvarchar(4000) 
set @sqls='select @a=count(*) from tableName ' 
exec sp_executesql @sqls,N'@a int output',@num output 
select @num 

[烟波钓]

[Quote=引用 1 楼 dawugui 的回复:]
动态语句?看最后一段.
--动态sql语句基本语法

SQL code


1 :普通SQL语句可以用Exec执行

eg: Select * from tableName
Exec('select * from tableName')
Exec sp_executesql N'select * from tableName' -- 请注意字符串前一定要加N

2……
[/Quote]
这么详细

[jack4238]

关键是我要将set @tem赋值，并且在赋值语句中又包含变量

[唐诗三百首]

declare @str nvarchar(max)
declare @tem int

set @str=' and type=1 or sort>20 '

if @str=' and type=1 or sort>20 '
 select @tem=sum(id) 
 from order 
 where Pid=20 and type=1 or sort>20 

[Barton]

create table #order(id int,type int,sort int,Pid int)

insert into #order(id,type,sort,Pid)
select 1,1,20,20  union all
select 2,1,20,20  union all
select 3,1,20,20  union all
select 4,1,20,20  union all
select 5,0,20,20  union all
select 6,0,21,20  

select * from #order

declare @str nvarchar(max)
declare @tem int


set @str=' type=1 or sort>20 '
set @str=N'select @tem_1=sum(id) from #order where ' +@str+ N' and Pid=20'
print @str
exec sp_executesql @str,N'@tem_1 int output',@tem_1=@tem output
select @tem

--or
set @str=' type=1 or sort>20 '
set @str=N'select sum(id) from #order where ' +@str+ N' and Pid=20'

declare @tb_value table(total int)
insert into @tb_value(total)
exec sp_sqlexec @str
select @tem=total from @tb_value
select @tem

[jack4238]

求高手指点，自己顶一下

[EnForGrass]

set @str=' and type=1 or sort>20 '
set @tem='select sum(id) from order where' +@str+ 'and Pid=20'

[jack4238]

但是我最终是要将select语句中的sum(id)赋值给@tem哦[Quote=引用 6 楼 chinajiyong 的回复:]

SQL code

set @str=' and type=1 or sort>20 '
set @tem='select sum(id) from order where' +@str+ 'and Pid=20'
[/Quote]

[jack4238]

求解啊