我想在sql语句里写个语句,它自己写个sql语句再执行
1.写sql语句 
 select   count(*)   as   times,   areaname   as   地区      from   AreaTable   where   @therCondition    
 2.给此语句的@therConditon   赋值 
 我设置   @therCondition= "   areaID=12 "   
 3.sql语句自己组合 
 (然后他就变成了) 
 select   count(*)   as   times,   areaname   as   地区      from   AreaTable   where   areaID=12   
 4.再执行 
 请问怎么做
------解决方案--------------------写个存储过程,将@therCondition传进去   
 create proc test1 
 @therCondition nvarchar(500) 
 as   
 exec( 'select count(*) as times, areaname as 地区  from AreaTable where  ' + @therCondition )     
------解决方案--------------------用存储过程   
 Create Procedure GetID @therCondition int 
 as 
 select count(*) as times, areaname as 地区   
 from AreaTable  
 where areaID=@therCondition    
 执行时运行   
 execute GetID 12     
------解决方案--------------------hb_gx(高升) 兄弟正解
------解决方案--------------------用动态SQL语句。   
 exec( 'select count(*) as times, areaname as 地区  from AreaTable where  ' + @therCondition )
------解决方案--------------------  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,  
         @sql nvarchar(4000)  
 set @sql= 'select count(*) from tableName '  
 exec(@sql)      
 --如何将exec执行结果放入变量中?    
 declare @num int, @sql nvarchar(4000)  
 set @sql= 'select @a=count(*) from tableName  '  
 exec sp_executesql @sql,N '@a int output ',@num output  
 select @num