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Alter PROCEDURE gzkbeifen
AS
declare @name char(10),@sqlname char(40)
set @name='gzk'+rtrim(cast(year(getdate()) as char)) +'_'+ cast (month(getdate()) as char)
set @sqlname='gzkbf.dbo.'+ @name
exec('select * into '+@sqlname+' from gzk')
GO
CREATE PROCEDURE gzkbeifen
AS
declare @name char(10),@sqlname char(40)
set @name='gzk'+rtrim(cast(year(getdate()) as char)) +'_'+ cast (month(getdate()) as char)
set @sqlname='gzkbf.dbo.'+ @name
--先判断表是否存在,如果存在就删除
if exists(select 1 from sysobjects where xtype='u'
and name=@name)
Exec('drop table '+@name)
Exec('select * into '+@sqlname+' from gzk')
GO
CREATE PROCEDURE gzkbeifen
AS
declare @name char(8000),@sqlname char(8000)
set @name='gzk'+rtrim(cast(year(getdate()) as char)) +'_'+ cast (month(getdate()) as char)
set @sqlname='gzkbf.dbo.'+ @name
select * into @sqlname from gzk
GO
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