动态存储过程中like语句

[swort_177]

if exists(select * from sysobjects where name='GetNewsCount' and type='p')
drop proc GetNewsCount
go
CREATE PROCEDURE GetNewsCount
@table varchar(60)
@title varchar(200)
as
declare @sql varchar(60)
set @sql=' select count(*) from '+rtrim(@table)+' where title like '+'%'+@title+'%'
exec (@sql)
GO
就是想把表名弄成动态的 但是后面的like语句要出问题
例如 select count(*) from tablename where title like 'content' 就是说 tablename 和title是动态的
该这么些啊 指点下

[chuifengde]

set @sql=' select count(*) from '+rtrim(@table)+' where title like ''%'+@title+'%'''

[水族杰纶]

SQL code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

[swort_177]

应该为
select count(*) from tablename where title like '%content%' 就是说 tablename 和content是动态的
该这么些啊 指点下

[中国风]

exec(' select count(*) from ['+@table+'] where title like '+'''%'+@title+'''%' )

字符串的引號要用兩次

[lgxyz]

set @sql=' select count(*) from '+rtrim(@table)+' where title like '+'%'+@title+'%' 
-->
set @sql=' select count(*) from '+rtrim(@table)+' where title like ''%'+@title+'%''' 

[swort_177]

成功了 结贴 感谢大家！