sql数据备份及删除备份

数据备份：

declare @a varchar(1000) set @a='backup database CDBST to disk = ''D:\DBbak\CDBST_'+convert(char(8),getdate(),112)+'''WITH COMPRESSION' 
exec(@a)
go

删除3天的数据备份：


/*
CREATE TABLE COAFile(
    id int IDENTITY,  --编号
    directory nvarchar(260),  --路径
    depth int, --深度，相对与@path
    IsFile bit,
    FileData varbinary(max) 
    )--0文件夹1文件名成
*/


DECLARE @Path nvarchar(260)
SET @Path = 'D:\DBbak'
IF OBJECT_ID('tempdb..#File') IS NOT NULL
    DROP TABLE #File
CREATE TABLE #File
(
    id int IDENTITY,  --编号
    directory nvarchar(260),  --路径
    depth int, --深度，相对与@path
    IsFile bit --0文件夹1文件名成
)
INSERT #File EXEC master.dbo.xp_dirtree 
    @path = @path,
    @depth = 0,
    @file = 1

declare @日期 char(8)=convert(char(8),getdate()-2,112)
select @日期 

select 
日期=SUBSTRING(directory,7,8),
* 
into #aa
from #File 

--select * from #File where directory like 'ssd_20200919%' order by directory
--select * from #aa where directory like 'ssd_20200919%' order by directory

declare @sql varchar(max)=''
select top 1000 @sql=@sql+'exec xp_cmdshell ''del "'+@Path+'\'+directory+'"''
' 
from #aa 
where 
日期<=@日期
order by directory
print @sql


exec(@sql)
drop table #File
drop table #aa

sql数据备份及删除备份

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