使用fn_dblog解析SQL SERVER 資料庫日誌方法

edwardking888發表於2010-12-30

SQLServer資料庫

一直以來我都很困惑，不知道怎麼解析SQL SERVER的日誌，

因為微軟提供了fn_dblog(NULL,NULL)和DBCC LOG獲取資料庫日誌的基本資訊，但是都是二進位制碼，看不懂。最近終於成功解析了SQL SERVER LOG資訊

在fn_dblog(NULL,NULL)輸出結果中，

獲取表名是AllocUnitName欄位。

具體獲取方法：AllocUnitName like 'dbo.TEST%'

操作型別是：Operation

資料是：[RowLog Contents 0]欄位內容

如果是UPDATE操作：修改後資料存放在[RowLog Contents 1]欄位內

最基本3種操作型別：'LOP_INSERT_ROWS','LOP_DELETE_ROWS','LOP_MODIFY_ROW'

具體解析程式碼如下：

--解析日誌
create function dbo.f_splitBinary(@s varbinary(8000))
returns @t table(id int identity(1,1),Value binary(1))
as
begin
declare @i int,@im int
select @i=1,@im=datalength(@s)
while @i<=@im
begin
insert into @t select substring(@s,@i,1)
set @i=@i+1
end
return
end

create function dbo.f_reverseBinary(@s varbinary(128))
returns varbinary(128)
as
begin
declare @r varbinary(128)
set @r=0x
select @r=@r+Value from dbo.f_splitBinary(@s) a order by id desc
return @r
end

GO

create proc [dbo].[p_getLog](@TableName sysname,@c int=100)
/*
解析日誌
胡冰
時間：2010年12月30日
工作單位：www.5173.com

sample: p_getLog 'tablename';

*/
as
set nocount on
declare @s varbinary(8000),@s1 varbinary(8000),@str varchar(8000),@str1 varchar(8000),@lb int,@le int,@operation varchar(128)
declare @i int,@lib int,@lie int,@ib int,@ie int,@lenVar int,@columnname sysname,@length int,@columntype varchar(32),@prec int,@scale int
declare @TUVLength int,@vc int,@tc int,@bitAdd int,@bitCount int,@count int

select b.name,b.length,c.name typename,b.colid,b.xprec,b.xscale,
    case when c.name not like '%var%' and c.name not in ('xml','text','image') then 1 else 2 end p,row_number() over(partition by
    case when c.name not like '%var%' and c.name not in ('xml','text','image') then 1 else 2 end order by colid) pid
into #t
    from sysobjects a inner join syscolumns b on a.id=b.id inner join systypes c on b.xtype=c.xusertype
    where a.name=@TableName order by b.colid

SELECT top(@c) Operation,[RowLog Contents 0],[RowLog Contents 1],[RowLog Contents 2],[RowLog Contents 3],[Log Record],id=identity(int,1,1) into #t1
    from::fn_dblog (null, null)
    where AllocUnitName like 'dbo.'+@TableName+'%'and
    Operation in('LOP_INSERT_ROWS','LOP_DELETE_ROWS','LOP_MODIFY_ROW' )
    AND Context not in ('LCX_IAM','LCX_PFS')
     order by [Current LSN] desc

select @tc=count(*) from #t

select @lb=min(id),@le=max(id) from #t1
while @lb<=@le
begin
    select @operation=Operation,@s=[RowLog Contents 0],@s1=[RowLog Contents 1] from #t1 where id=@lb AND [RowLog Contents 1] IS NOT NULL
    set @TUVLength=convert(int,dbo.f_reverseBinary(substring(@s,3,2)))+3
    select @i=5,@str='',@vc=0,@bitCount=0
    select @lib=min(pid),@lie=max(pid) from #t where p=1
    while @lib<=@lie
    begin
        select @columnname=name,@length=length,@columntype=typename,@prec=xprec,@scale=xscale,@vc=colid-1 from #t where p=1 and pid=@lib
--        if @columntype<>'bit'
--            print rtrim(@i)+'->'+rtrim(@length)

        if dbo.f_reverseBinary(substring(@s,@TUVLength,1+((@tc-1)/8))) & power(2,@vc) <> 0
        begin
            if @columntype<>'bit'
                select @str=@str+@columnname+'=NULL,',@i=@i+@length
            else
            begin
                select @str=@str+@columnname+'=NULL,'
                set @bitAdd = case when @bitCount=0 then @i else @bitAdd end
                set @bitCount = (@bitCount + 1)%8
                set @i=@i+case @bitCount when 1 then 1 else 0 end
--                print rtrim(@bitAdd)+'->'+rtrim(@length)
            end
        end
        else if @columntype='char'
            select @str=@str+@columnname+'='+convert(varchar(256),substring(@s,@i,@length))+',',@i=@i+@length
        else if @columntype='nchar'
            select @str=@str+@columnname+'='+convert(nvarchar(256),substring(@s,@i,@length))+',',@i=@i+@length
        else if @columntype='datetime'
            select @str=@str+@columnname+'='+convert(varchar,dateadd(second,convert(int,dbo.f_reverseBinary(substring(@s,@i,4)))/300
                ,dateadd(day,convert(int,dbo.f_reverseBinary(substring(@s,@i+4,4))),'1900-01-01')),120)+',',@i=@i+8
        else if @columntype='smalldatetime'
            select @str=@str+@columnname+'='+convert(varchar,dateadd(minute,convert(int,dbo.f_reverseBinary(substring(@s,@i,2)))
                ,dateadd(day,convert(int,dbo.f_reverseBinary(substring(@s,@i+2,2))),'1900-01-01')),120)+',',@i=@i+4
        else if @columntype='int'
            select @str=@str+@columnname+'='+rtrim(convert(int,dbo.f_reverseBinary(substring(@s,@i,4))))+',',@i=@i+4
        else if @columntype='decimal'
            select @str=@str+@columnname+'=DECIMAL,',@i=@i+@length
        else if @columntype='bit'
        begin
            set @bitAdd = case when @bitCount=0 then @i else @bitAdd end
            set @bitCount = (@bitCount + 1)%8
            select @str=@str+@columnname+'='+rtrim(convert(bit,substring(@s,@bitAdd,1)&power(2,case @bitCount when 0 then 8 else @bitCount end-1)))+','
                ,@i=@i+case @bitCount when 1 then 1 else 0 end
--            print rtrim(@bitAdd)+'->'+rtrim(@length)
        end
        set @lib=@lib+1
    end
    set @i=convert(int,dbo.f_reverseBinary(substring(@s,3,2)))+4+((@tc-1)/8)
    set @lenVar=convert(int,dbo.f_reverseBinary(substring(@s,@i,2)))
    set @i=@i+2
    set @ib=@i + @lenVar*2
    set @ie=convert(int,dbo.f_reverseBinary(substring(@s,@i,2)))
    set @count=0
    select @lib=min(pid),@lie=max(pid) from #t where p=2
    while @lib<=@lie
    begin
--        print rtrim(@ib)+'->'+rtrim(@ie)
        select @columnname=name,@length=length,@columntype=typename,@vc=colid-1 from #t where p=2 and pid=@lib
        if dbo.f_reverseBinary(substring(@s,@TUVLength,1+((@tc-1)/8))) & power(2,@vc) <> 0
        begin
            select @str=@str+@columnname+'=NULL,'
            select @ib=@ie+1,@i=@i+2
            if @count                set @ie=convert(int,dbo.f_reverseBinary(substring(@s,@i,2)))
        end
        else if @columntype='varchar'
        begin
            select @str=@str+@columnname+'='+convert(varchar(256),substring(@s,@ib,@ie-@ib+1))+','
            select @ib=@ie+1,@i=@i+2
            set @ie=convert(int,dbo.f_reverseBinary(substring(@s,@i,2)))
        end
        else if @columntype='nvarchar'
        begin
            select @str=@str+@columnname+'='+convert(nvarchar(256),substring(@s,@ib,@ie-@ib+1))+','
            select @ib=@ie+1,@i=@i+2
            set @ie=convert(int,dbo.f_reverseBinary(substring(@s,@i,2)))
        end
        set @count=@count+1
        set @lib=@lib+1
    end
    set @str=left(@str,len(@str)-1)

     IF @operation ='LOP_MODIFY_ROW'
     BEGIN
          set @TUVLength=convert(int,dbo.f_reverseBinary(substring(@s1,3,2)))+3
   select @i=5,@str1='',@vc=0,@bitCount=0
   select @lib=min(pid),@lie=max(pid) from #t where p=1
   while @lib<=@lie
   begin
    select @columnname=name,@length=length,@columntype=typename,@prec=xprec,@scale=xscale,@vc=colid-1 from #t where p=1 and pid=@lib
  --        if @columntype<>'bit'
  --            print rtrim(@i)+'->'+rtrim(@length)

    if dbo.f_reverseBinary(substring(@s1,@TUVLength,1+((@tc-1)/8))) & power(2,@vc) <> 0
    begin
     if @columntype<>'bit'
      select @str1=@str1+@columnname+'=NULL,',@i=@i+@length
     else
     begin
      select @str1=@str1+@columnname+'=NULL,'
      set @bitAdd = case when @bitCount=0 then @i else @bitAdd end
      set @bitCount = (@bitCount + 1)%8
      set @i=@i+case @bitCount when 1 then 1 else 0 end
  --                print rtrim(@bitAdd)+'->'+rtrim(@length)
     end
    end
    else if @columntype='char'
     select @str1=@str1+@columnname+'='+convert(varchar(256),substring(@s1,@i,@length))+',',@i=@i+@length
    else if @columntype='nchar'
     select @str1=@str1+@columnname+'='+convert(nvarchar(256),substring(@s1,@i,@length))+',',@i=@i+@length
    else if @columntype='datetime'
     select @str1=@str1+@columnname+'='+convert(varchar,dateadd(second,convert(int,dbo.f_reverseBinary(substring(@s1,@i,4)))/300
      ,dateadd(day,convert(int,dbo.f_reverseBinary(substring(@s1,@i+4,4))),'1900-01-01')),120)+',',@i=@i+8
    else if @columntype='smalldatetime'
     select @str1=@str1+@columnname+'='+convert(varchar,dateadd(minute,convert(int,dbo.f_reverseBinary(substring(@s1,@i,2)))
      ,dateadd(day,convert(int,dbo.f_reverseBinary(substring(@s1,@i+2,2))),'1900-01-01')),120)+',',@i=@i+4
    else if @columntype='int'
     select @str1=@str1+@columnname+'='+rtrim(convert(int,dbo.f_reverseBinary(substring(@s1,@i,4))))+',',@i=@i+4
    else if @columntype='decimal'
     select @str1=@str1+@columnname+'=DECIMAL,',@i=@i+@length
    else if @columntype='bit'
    begin
     set @bitAdd = case when @bitCount=0 then @i else @bitAdd end
     set @bitCount = (@bitCount + 1)%8
     select @str1=@str1+@columnname+'='+rtrim(convert(bit,substring(@s1,@bitAdd,1)&power(2,case @bitCount when 0 then 8 else @bitCount end-1)))+','
      ,@i=@i+case @bitCount when 1 then 1 else 0 end
  --            print rtrim(@bitAdd)+'->'+rtrim(@length)
    end
    set @lib=@lib+1
   end
   set @i=convert(int,dbo.f_reverseBinary(substring(@s1,3,2)))+4+((@tc-1)/8)
   set @lenVar=convert(int,dbo.f_reverseBinary(substring(@s1,@i,2)))
   set @i=@i+2
   set @ib=@i + @lenVar*2
   set @ie=convert(int,dbo.f_reverseBinary(substring(@s1,@i,2)))
   set @count=0
   select @lib=min(pid),@lie=max(pid) from #t where p=2
   while @lib<=@lie
   begin
  --        print rtrim(@ib)+'->'+rtrim(@ie)
    select @columnname=name,@length=length,@columntype=typename,@vc=colid-1 from #t where p=2 and pid=@lib
    if dbo.f_reverseBinary(substring(@s1,@TUVLength,1+((@tc-1)/8))) & power(2,@vc) <> 0
    begin
     select @str1=@str1+@columnname+'=NULL,'
     select @ib=@ie+1,@i=@i+2
     if @count      set @ie=convert(int,dbo.f_reverseBinary(substring(@s1,@i,2)))
    end
    else if @columntype='varchar'
    begin
     select @str1=@str1+@columnname+'='+convert(varchar(256),substring(@s1,@ib,@ie-@ib+1))+','
     select @ib=@ie+1,@i=@i+2
     set @ie=convert(int,dbo.f_reverseBinary(substring(@s1,@i,2)))
    end
    else if @columntype='nvarchar'
    begin
     select @str1=@str1+@columnname+'='+convert(nvarchar(256),substring(@s1,@ib,@ie-@ib+1))+','
     select @ib=@ie+1,@i=@i+2
     set @ie=convert(int,dbo.f_reverseBinary(substring(@s1,@i,2)))
    end
    set @count=@count+1
    set @lib=@lib+1
   end
   set @str1=left(@str1,len(@str1)-1)

     END

    IF @operation ='LOP_MODIFY_ROW'
    BEGIN
    print   @operation+'修改前值： '+@str

    print   @operation+'修改後值：'+@str1

    END
    ELSE
BEGIN
  print @operation+':'+@str
END




    set @lb=@lb+1
END

drop table #t,#t1

準備元旦後再改改，

因為目前解析SQL 2008會有很多錯誤，要是認識微軟引擎組的人就好了！

來自 “ ITPUB部落格 ” ，連結：http://blog.itpub.net/8183550/viewspace-682907/，如需轉載，請註明出處，否則將追究法律責任。

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使用fn_dblog解析SQL SERVER 資料庫日誌方法

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