declare @drive as char(10)
set @drive='C'
CREATE DATABASE test ON PRIMARY
( NAME = N'DATABASENAME_dat', FILENAME =@drive+ N'\DATABASENAME.mdf' , SIZE = 5MB , MAXSIZE = UNLIMITED, FILEGROWTH = 5MB )
LOG ON
( NAME = N'DATABASENAME_log', FILENAME =@drive+ N'\DATABASENAME.ldf' , SIZE = 5MB , MAXSIZE = UNLIMITED, FILEGROWTH = 5MB )想用@drive動態的創建在不同的盤中,結果出錯." Incorrect syntax near '@drive'."
set @drive='C'
CREATE DATABASE test ON PRIMARY
( NAME = N'DATABASENAME_dat', FILENAME =@drive+ N'\DATABASENAME.mdf' , SIZE = 5MB , MAXSIZE = UNLIMITED, FILEGROWTH = 5MB )
LOG ON
( NAME = N'DATABASENAME_log', FILENAME =@drive+ N'\DATABASENAME.ldf' , SIZE = 5MB , MAXSIZE = UNLIMITED, FILEGROWTH = 5MB )想用@drive動態的創建在不同的盤中,結果出錯." Incorrect syntax near '@drive'."
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 [/code]
declare @drive sysname
set @drive='C:' exec('CREATE DATABASE [b] ON PRIMARY
( NAME = N''b'', FILENAME = N'''+@drive+'\Program Files\Microsoft SQL Server\MSSQL.1\MSSQL\DATA\b.mdf'' , SIZE = 3072KB , MAXSIZE = UNLIMITED, FILEGROWTH = 1024KB )
LOG ON
( NAME = N''b_log'', FILENAME = N'''+@drive+'\Program Files\Microsoft SQL Server\MSSQL.1\MSSQL\DATA\b_log.ldf'' , SIZE = 1024KB , MAXSIZE = 2048GB , FILEGROWTH = 10%)
COLLATE Chinese_PRC_CI_AS')
declare @drive sysname,@basename sysname
--路径
set @drive='C:\Program Files\Microsoft SQL Server\MSSQL.1\MSSQL\DATA'
--库名
set @basename='e'
exec('CREATE DATABASE ['+@basename+'] ON PRIMARY
( NAME = N'''+@basename+''', FILENAME = N'''+@drive+'\'+@basename+'.mdf'' , SIZE = 3072KB , MAXSIZE = UNLIMITED, FILEGROWTH = 1024KB )
LOG ON
( NAME = N'''+@basename+'_log'', FILENAME = N'''+@drive+'\'+@basename+'_log.ldf'' , SIZE = 1024KB , MAXSIZE = 2048GB , FILEGROWTH = 10%)
COLLATE Chinese_PRC_CI_AS')