不知道表名如何定义
我用create table bbs'+@i+'好象不行(刚开始学的,可能笑话了)代码如下:
declare @i int
set @i=3
while @i<5
begin
create table bbs'+@i+'
(
id int,
title varchar(100),
Content varchar(8000)
)create table report'+@i+'
(
id int,
topid int,
Content varchar(8000),
ip varchar(15),
)
set @i=@i+1
end
我用create table bbs'+@i+'好象不行(刚开始学的,可能笑话了)代码如下:
declare @i int
set @i=3
while @i<5
begin
create table bbs'+@i+'
(
id int,
title varchar(100),
Content varchar(8000)
)create table report'+@i+'
(
id int,
topid int,
Content varchar(8000),
ip varchar(15),
)
set @i=@i+1
end
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
exec('
declare @i int
set @i=3
while @i<5
begin
create table bbs''+@i+''
(
id int,
title varchar(100),
Content varchar(8000)
)create table report''+@i+''
(
id int,
topid int,
Content varchar(8000),
ip varchar(15),
)
set @i=@i+1
end
')
set @i=3
while @i<5
begin
exec('
create table bbs'+convert(varchar(10),@i)+'
(
id int,
title varchar(100),
Content varchar(8000)
)
create table report'+convert(varchar(10),@i)+'
(
id int,
topid int,
Content varchar(8000),
ip varchar(15),
)
')
set @i=@i+1
end
declare @sql nvarchar(200)
set @i=3
while @i<5
begin
set @sql='create table bbs'+CONVERT(nvarchar(20),@i)+'
(
id int,
title varchar(100),
Content varchar(8000)
)create table report'+CONVERT(nvarchar(20),@i)+'
(
id int,
topid int,
Content varchar(8000),
ip varchar(15),
)'
exec (@sql)
set @i=@i+1
end