我使用下面的方式首先测试下:
ALTER PROCEDURE [dbo].[Autoback](
)
as
declare @FullPath varchar(1000)
begin
declare @sql varchar(500)
set @FullPath = 'D:\' + 'CustomerDB_'+convert(VARCHAR(4),year(getdate()))+right( '0'+convert(VARCHAR(2),MONTH(getdate())),2)+right('0'+convert(VARCHAR(2),DAY(getdate())),2)
backup database test to disk=@FullPath WITH INIT
end
执行没问题,备份成功,现在我要将数据库名和存放的路径做为参数提供出来.ALTER PROCEDURE [dbo].[Autoback](
@DataBaseName varchar(100),
@SavePath varchar(500)
)
as
declare @FullPath varchar(1000)
begin
declare @sql varchar(500)
set @FullPath = @SavePath + @DataBaseName + '_'+convert(VARCHAR(4),year(getdate()))+right( '0'+convert(VARCHAR(2),MONTH(getdate())),2)+right('0'+convert(VARCHAR(2),DAY(getdate())),2)
--backup database test to disk=@FullPath WITH INIT
set @sql='backup database' + @DataBaseName + 'to disk=' + @FullPath + ' WITH INIT'
exec(@sql)有问题了,麻烦各位大虾们帮小弟一个忙啊
end
ALTER PROCEDURE [dbo].[Autoback](
)
as
declare @FullPath varchar(1000)
begin
declare @sql varchar(500)
set @FullPath = 'D:\' + 'CustomerDB_'+convert(VARCHAR(4),year(getdate()))+right( '0'+convert(VARCHAR(2),MONTH(getdate())),2)+right('0'+convert(VARCHAR(2),DAY(getdate())),2)
backup database test to disk=@FullPath WITH INIT
end
执行没问题,备份成功,现在我要将数据库名和存放的路径做为参数提供出来.ALTER PROCEDURE [dbo].[Autoback](
@DataBaseName varchar(100),
@SavePath varchar(500)
)
as
declare @FullPath varchar(1000)
begin
declare @sql varchar(500)
set @FullPath = @SavePath + @DataBaseName + '_'+convert(VARCHAR(4),year(getdate()))+right( '0'+convert(VARCHAR(2),MONTH(getdate())),2)+right('0'+convert(VARCHAR(2),DAY(getdate())),2)
--backup database test to disk=@FullPath WITH INIT
set @sql='backup database' + @DataBaseName + 'to disk=' + @FullPath + ' WITH INIT'
exec(@sql)有问题了,麻烦各位大虾们帮小弟一个忙啊
end
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