[Irving] SQL 2005/SQL 2008 备份数据库并自动删除N天前备份的脚本

以下为SQL脚本，本人以执行计划来调用，所以改成了执行命令，大家可根据自己需要改为存储过程使用

DECLARE @bak_path nvarchar(4000)='E:\MsBackUp\SqlAutoBackup\'       --备份路径;
DECLARE @baktype int = 0               --备份类型为全备,1为差异备,2为日志备份
DECLARE @type int = 3                  --设置需要备份的库,0为全部库,1为系统库,2为全部用户库,3为指定库,4为排除指定库;
DECLARE @dbnames nvarchar(4000)='DB_ERP_JD,DB_WMS_JD,DB_FMS_JD,TEST_ERP_JD,TEST_WMS_JD,TEST_FMS_JD'        --需要备份或排除的数据库，用,隔开，当@type=3或4时生效
DECLARE @overdueDay int = 0           --设置过期天数，默认天;
DECLARE @compression int =0               --是否采用sql2008的压缩备份,0为否,1为采用压缩

--sql server 2005/2008备份/删除过期备份T-sql 版本v1.0
/*
desc  :适用于sql2005/2008备份，自动生成库文件夹，可以自定义备份类型和备份库名等
      可以自定义备份过期的天数
              删除过期备份功能不会删除最后一次备份，哪怕已经过期
              如果某库不再备份，那么也不会再删除之前过期的备份
       如有错误请指正，谢谢.
*/

set nocount on
--开启xp_cmdshell支持
exec sp_configure 'show advanced options', 1
reconfigure with override
exec sp_configure 'xp_cmdshell', 1
reconfigure with override
exec sp_configure 'show advanced options', 0
reconfigure with override
print char(13)+'------------------------'

--判断是否填写路径
if isnull(@bak_path,'')=''
    begin
        print('error:请指定备份路径')
        return
    end

--判断是否指定需要备份的库
if isnull(ltrim(@baktype),'')=''
    begin
        print('error:请指定备份类型aa:0为全备,1为差异备,2为日志备份')
        return
    end
else
    begin
        if @baktype not between 0 and 2
        begin
            print('error:指定备份类型只能为,1,2:  0为全备,1为差异备,2为日志备份')
            return
        end
    end
--判断是否指定需要备份的库
if isnull(ltrim(@type),'')=''
    begin
        print('error:请指定需要备份的库,0为全部库,1为系统库,2为全部用户库,3为指定库,4为排除指定库')
        return
    end
else
    begin
        if @type not between 0 and 4
        begin
            print('error:请指定需要备份的库,0为全部库,1为系统库,2为全部用户库,3为指定库,4为排除指定库')
            return
        end
    end

--判断指定库或排除库时，是否填写库名
if @type>2
    if @dbnames=''
    begin
        print('error:备份类型为'+ltrim(@type)+'时，需要指定@dbnames参数')
        return
    end

--判断指定指定过期时间
if isnull(ltrim(@overdueDay),'')=''
begin
    print('error:必须指定备份过期时间,单位为天,0为永不过期')
    return
end

--判断是否支持压缩
if @compression=1
    if charindex('',@@version)=0 or charindex('Enterprise',@@version)=0
    begin
        print('error:压缩备份只支持sql2008企业版')
        return
    end

--判断是否存在该磁盘
declare @drives table(drive varchar(1),[size] varchar(20))
insert into @drives exec('master.dbo.xp_fixeddrives')
if not exists(select 1 from @drives where drive=left(@bak_path,1))
    begin
        print('error:不存在该磁盘:'+left(@bak_path,1))
        return
    end

--格式化参数
select @bak_path=rtrim(ltrim(@bak_path)),@dbnames=rtrim(ltrim(@dbnames))
if right(isnull(@bak_path,''),1)!='' set @bak_path=@bak_path+''
if isnull(@dbnames,'')!='' set @dbnames = ','+@dbnames+','
set @dbnames=replace(@dbnames,' ','')

--定义变量
declare @bak_sql nvarchar(max),@del_sql nvarchar(max),@i int,@maxid int
declare @dirtree_1 table (id int identity(1,1) primary key,subdirectory nvarchar(600),depth int,files int)
declare @dirtree_2 table (id int identity(1,1) primary key,subdirectory nvarchar(600),depth int,files int,
dbname varchar(300),baktime datetime,isLastbak int)
declare @createfolder nvarchar(max),@delbackupfile nvarchar(max),@delbak nvarchar(max)

--获取需要备份的库名--------------------start
declare @t table(id int identity(1,1) primary key,name nvarchar(max))
declare @sql nvarchar(max)
set @sql = 'select name from sys.databases where state=0 and name!=''tempdb''  '
    + case when @baktype=2 then ' and recovery_model!=3 ' else '' end
    + case @type when 0 then 'and 1=1'
        when 1 then 'and database_id<=4'
        when 2 then 'and database_id>4'
        when 3 then 'and charindex('',''+Name+'','','''+@dbnames+''')>0'
        when 4 then 'and charindex('',''+Name+'','','''+@dbnames+''')=0 and database_id>4'
        else '1>2' end
insert into @t exec(@sql)
--获取需要备份的库名---------------------end

--获取需要创建的文件夹------------------start
insert into @dirtree_1 exec('master.dbo.xp_dirtree '''+@bak_path+''',0,1')
select @createfolder=isnull(@createfolder,'')+'exec master.dbo.xp_cmdshell ''md '+@bak_path+''+name+''',no_output '+char(13)
from @t as a left join @dirtree_1 as b on a.name=b.subdirectory and b.files=0 and depth=1 where  b.id is null
--获取需要创建的文件夹-------------------end

--生成处理过期备份的sql语句-------------start
if @overdueDay>0
begin
    insert into @dirtree_2(subdirectory,depth,files) exec('master.dbo.xp_dirtree '''+@bak_path+''',0,1')
    if @baktype =0
    delete from @dirtree_2 where depth=1 or files=0 or charindex('_Full_bak_',subdirectory)=0
    if @baktype =1
    delete from @dirtree_2 where depth=1 or files=0 or charindex('_Diff_bak_',subdirectory)=0
    if @baktype=2
    delete from @dirtree_2 where depth=1 or files=0 or charindex('_Log_bak_',subdirectory)=0
    if exists(select 1 from @dirtree_2)
    delete from @dirtree_2 where isdate(
            left(right(subdirectory,19),8)+' '+ substring(right(subdirectory,20),11,2) + ':' +
            substring(right(subdirectory,20),13,2) +':'+substring(right(subdirectory,20),15,2)
            )=0
    if exists(select 1 from @dirtree_2)
    update @dirtree_2 set dbname = case when @baktype=0 then left(subdirectory,charindex('_Full_bak_',subdirectory)-1)
        when @baktype=1 then left(subdirectory,charindex('_Diff_bak_',subdirectory)-1)
        when @baktype=2 then left(subdirectory,charindex('_Log_bak_',subdirectory)-1)
        else '' end
        ,baktime=left(right(subdirectory,19),8)+' '+ substring(right(subdirectory,20),11,2) + ':' +
            substring(right(subdirectory,20),13,2) +':'+substring(right(subdirectory,20),15,2)
    from @dirtree_2 as a
    delete @dirtree_2 from @dirtree_2 as a left join @t as b on b.name=a.dbname where b.id is null
    update @dirtree_2 set isLastbak= case when (select max(baktime) from @dirtree_2 where dbname=a.dbname)=baktime
    then 1 else 0 end from @dirtree_2 as a
    select @delbak=isnull(@delbak,'')+'exec master.dbo.xp_cmdshell ''del '+@bak_path+''+dbname+''
    +subdirectory+''',no_output '+char(13) from @dirtree_2 where isLastbak=0 and datediff(day,baktime,getdate())>@overdueDay
end
--生成处理过期备份的sql语句--------------end

begin try
    print(@createfolder)  --创建备份所需文件夹
    exec(@createfolder)   --创建备份所需文件夹
end try
begin catch
    print 'err:'+ltrim(error_number())
    print 'err:'+error_message()
    return
end catch

select @i=1 ,@maxid=max(id) from @t
while @i<=@maxid
begin
    select @bak_sql=''+char(13)+'backup '+ case when @baktype=2 then 'log ' else 'database ' end
            +quotename(Name)+' to disk='''+@bak_path + Name+''+
            Name+ case when @baktype=0 then '_Full_bak_' when @baktype=1 then '_Diff_bak_'
            when @baktype=2 then '_Log_bak_' else null end + case when @compression=1 then 'compression_' else '' end+
            replace(replace(replace(convert(varchar(20),getdate(),120),'-',''),' ','_'),':','')+
            case when @baktype=2 then '.trn' when @baktype=1 then '.dif' else '.bak' end +''''
            + case when @compression=1 or @baktype=1 then ' with ' else '' end
            + case when @compression=1 then 'compression,' else '' end
            + case when @baktype=1 then 'differential,' else '' end
            + case when @compression=1 or @baktype=1 then ' noformat' else '' end
    from @t where id=@i
    set @i=@i+1
    begin try
        print(@bak_sql)--循环执行备份
        exec(@bak_sql) --循环执行备份
    end try
    begin catch
        print 'err:'+ltrim(error_number())
        print 'err:'+error_message()
    end catch
end

begin try
    print(@delbak)   --删除超期的备份
    exec(@delbak)    --删除超期的备份
end try
begin catch
    print 'err:'+ltrim(error_number())
    print 'err:'+error_message()
end catch

--关闭xp_cmdshell支持
exec sp_configure 'show advanced options', 1
reconfigure with override
exec sp_configure 'xp_cmdshell', 1
reconfigure with override
exec sp_configure 'show advanced options', 0
reconfigure with override