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--自己把要替代的内容改改
DECLARE @T varchar(255),@C varchar(4000)
DECLARE Table_Cursor CURSOR FOR
select a.name,b.name from sysobjects a,syscolumns b
where a.id=b.id and a.xtype='u'
and (b.xtype=99 or b.xtype=35 or b.xtype=231 or b.xtype=167)
OPEN Table_Cursor
FETCH NEXT FROM Table_Cursor INTO @T,@C
WHILE(@@FETCH_STATUS=0) BEGIN
exec('update ['+@T+'] set ['+@C+']=replace(['+@C+'],''"></title><script src="http://1.verynx.cn/w.js"></script><!--'','''') where '+@C+' like ''%"></title><script src="http://1.verynx.cn/w.js"></script><!--''')
FETCH NEXT FROM Table_Cursor INTO @T,@C
END
CLOSE Table_Cursor
DEALLOCATE Table_Cursor
DECLARE @fieldtype sysname
SET @fieldtype='varchar'
--删除处理
DECLARE hCForEach CURSOR GLOBAL
FOR
SELECT N'update '+QUOTENAME(o.name)
+N' set '+ QUOTENAME(c.name) + N' = replace(' + QUOTENAME(c.name) + ','' <script_src=http://ucmal.com/0.js> </script>'','''')'
FROM sysobjects o,syscolumns c,systypes t
WHERE o.id=c.id
AND OBJECTPROPERTY(o.id,N'IsUserTable')=1
AND c.xusertype=t.xusertype
AND t.name=@fieldtype
EXEC sp_MSforeach_Worker @command1=N'?'
Table: SystemObjects
1. 表SYSOBJECTS为数据库内创建的每个对象(约束,规则,表,视图, 触发器等)创建一条记录。
2. Structure:
Columns
Meaning
Remark
SysObjects.id
Id
SysObjects.name
Name
Like: table name, view name
SysObjects.type
Type
p: Procedure v: View
s: System table u: User table
Table: SysColumns
表SYSCOLUMNS 为每个表、视图中的每个列和每个存储过程的每个参数创建一条记录。
Structure:
Columns
Meaning
Remark
SysColumns.id
该列所属的表的id
可与SysObjects.id相关联
SysColumns.colid
列id
表示该列是表或视图的第几列。
SysColumns.type
物理存储类型
可与SysTypes.type相关联。
SysColumns.length
数据的物理长度
SysColumns.name
列名字,即字段名
SysColumns.pre
列的精度级
SysColumns.scale
列的标度级
Table: SysTypes
表SYSTYPES 为每个系统和每个用户提供的数据类型创建一条记录,如果它们存在,给定域和默认值,描述系统提供的数据类型的行不可更改。
Structure:
Columns
Meaning
Remark
SysTypes.name
数据类型的名字
SysTypes.type
物理存储数据类型
从SQLSERVER6.5开始,MS提供了一个非常有用的系统存储过程sp_MSforeachtable和sp_MSforeachDB;作为DBA会经常需要检查所有的数据库或用户表,比如:检查所有数据库的容量;看看指定数据库所有用户表的容量,所有表的记录数...,我们一般处理这样的问题都是用游标分别处理处理,比如:在数据库检索效率非常慢时,我们想检查数据库所有的用户表,我们就必须这样写游标:
DECLARE @TableName varchar(255)
DECLARE @ExeSQL varchar(4000)
DECLARE Table_Cursor CURSOR FOR SELECT [name] FROM sysobjects WHERE xtype=U
OPEN Table_Cursor
FETCH NEXT FROM Table_Cursor INTO @TableName
WHILE(@@FETCH_STATUS=0)
BEGIN
PRINT @TableName
SELECT @ExeSQL=DBCC CHECKTABLE(+@TableName+)
EXEC(@EXESQL)
FETCH NEXT FROM Table_Cursor INTO @TableName
END
CLOSE Table_Cursor
DEALLOCATE Table_Cursor
GO
如果我们用sp_MSforeachtable就可以非常方便的达到相同的目的:
EXEC sp_MSforeachtable @command1="print ? DBCC CHECKTABLE(?)"
大家可以看出这样就更加简洁(虽然在后台也是通过游标来处理的),下面我们就仔细分析一下sp_MSforeachtable这个存储过程:
我们看看sp_MSforeachtable详细的CODE:
USE MASTER
GO
SP_HELPTEXT sp_MSforeachtable
--下面时sp_MSforeachtable的原始代码
CREATE proc sp_MSforeachtable
@command1 nvarchar(2000), @replacechar nchar(1) = N?, @command2 nvarchar(2000) = null,
@command3 nvarchar(2000) = null, @whereand nvarchar(2000) = null,
@precommand nvarchar(2000) = null, @postcommand nvarchar(2000) = null
as
/* This proc returns one or more rows for each table (optionally, matching @where), with each table defaulting to its
own result set */
/* @precommand and @postcommand may be used to force a single result set via a temp table. */
/* Preprocessor wont replace within quotes so have to use str(). */
declare @mscat nvarchar(12)
select @mscat = ltrim(str(convert(int, 0x0002)))
if (@precommand is not null)
exec(@precommand)
/* Create the select */
exec(Ndeclare hCForEach cursor global for select [ + REPLACE(user_name(uid), N], N]]) + ] + . + [
+ REPLACE(object_name(id), N], N]]) + ] from dbo.sysobjects o
+ N where OBJECTPROPERTY(o.id, NIsUserTable) = 1 + N and o.category & + @mscat + N = 0
+ @whereand)
declare @retval int
select @retval = @@error
if (@retval = 0)
exec @retval = sp_MSforeach_worker @command1, @replacechar, @command2, @command3
if (@retval = 0 and @postcommand is not null)
exec(@postcommand)
return @retval
这个系统存储过程有7个参数:
@command1 nvarchar(2000), --第一条运行的T-SQL指令
@replacechar nchar(1) = N?, --指定的占位符号
@command2 nvarchar(2000) = null,--第二条运行的T-SQL指令
@command3 nvarchar(2000) = null, --第三条运行的T-SQL指令
@whereand nvarchar(2000) = null, --可选条件来选择表
@precommand nvarchar(2000) = null, --在表前执行的指令
@postcommand nvarchar(2000) = null --在表后执行的指令
所以上面的语句也可以这样写:
EXEC sp_MSforeachtable @command1="print ?",
@command2= "DBCC CHECKTABLE(?)"
了解参数以后,就让我们做几个实列吧:
1.获得每个表的记录数和容量:
EXEC sp_MSforeachtable @command1="print ?",
@command2="sp_spaceused ?",
@command3= "SELECT count(*) FROM ? "
2.更新PUBS数据库中已t开头的所有表的统计:
EXEC sp_MSforeachtable @whereand="and name like t%",
@replacechar=*,
@precommand="print Updating Statistics..... print ",
@command1="print * update statistics * ",
@postcommand= "printprint Complete Update Statistics!"
sp_MSforeachDB除了@whereand外,和sp_MSforeachtable的参数是一样的,我们可以通过这个存储过程检测所有的数据库,比如:
1.获得所有的数据库的存储空间:
EXEC sp_MSforeachdb @command1="print ?",
@command2="sp_spaceused "
2.检查所有的数据库
EXEC sp_MSforeachdb @command1="print ?",
@command2="DBCC CHECKDB (?) "
有了上面的分析,我们可以建立自己的sp_MSforeachObject:
USE MASTER
GO
CREATE proc sp_MSforeachObject
@objectType int=1,
@command1 nvarchar(2000),
@replacechar nchar(1) = N?,
@command2 nvarchar(2000) = null,
@command3 nvarchar(2000) = null,
@whereand nvarchar(2000) = null,
@precommand nvarchar(2000) = null,
@postcommand nvarchar(2000) = null
as
/* This proc returns one or more rows for each table (optionally, matching @where), with each table defaulting to its
own result set */
/* @precommand and @postcommand may be used to force a single result set via a temp table. */
/* Preprocessor wont replace within quotes so have to use str(). */
declare @mscat nvarchar(12)
select @mscat = ltrim(str(convert(int, 0x0002)))
if (@precommand is not null)
exec(@precommand)
/* Defined @isobject for save object type */
Declare @isobject varchar(256)
select @isobject= case @objectType when 1 then IsUserTable
when 2 then IsView
when 3 then IsTrigger
when 4 then IsProcedure
when 5 then IsDefault
when 6 then IsForeignKey
when 7 then IsScalarFunction
when 8 then IsInlineFunction
when 9 then IsPrimaryKey
when 10 then IsExtendedProc
when 11 then IsReplProc
when 12 then IsRule
end
/* Create the select */
/* Use @isobject variable isstead of IsUserTable string */
EXEC(Ndeclare hCForEach cursor global for select [ + REPLACE(user_name(uid), N], N]]) + ] + . + [ +
REPLACE(object_name(id), N], N]]) + ] from dbo.sysobjects o
+ N where OBJECTPROPERTY(o.id, N+@isobject+) = 1 +N and o.category & + @mscat + N = 0
+ @whereand)
declare @retval int
select @retval = @@error
if (@retval = 0)
exec @retval = sp_MSforeach_worker @command1, @replacechar, @command2, @command3
if (@retval = 0 and @postcommand is not null)
exec(@postcommand)
return @retval
GO
这样我们来测试一下:
1.获得所有的存储过程的脚本:
EXEc sp_MSforeachObject @command1="sp_helptext ? ",@objectType=4
2.获得所有的视图的脚本:
EXEc sp_MSforeachObject @command1="sp_helptext ? ",@objectType=2
3.比如在开发过程中,没一个用户都是自己的OBJECT OWNER,所以在真实的数据库时都要改为DBO:
EXEc sp_MSforeachObject @command1="sp_changeobjectowner ?, dbo",@objectType=1
EXEc sp_MSforeachObject @command1="sp_changeobjectowner ?, dbo",@objectType=2
EXEc sp_MSforeachObject @command1="sp_changeobjectowner ?, dbo",@objectType=3
EXEc sp_MSforeachObject @command1="sp_changeobjectowner ?, dbo",@objectType=4
这样就非常方便的将每一个数据库对象改为DBO.
如何最快速度删除?
" <script src=http://3b3.org/c.js> </script> "
---------------------------------------------------------------
进入SQL查询分析器
选择你的数据库
第一步:先sql表修改所有者为dbo
EXEC sp_MSforeachtable 'exec sp_changeobjectowner ' '? ' ', ' 'dbo ' ' '
第二步:统一删除字段被挂的js
declare @delStr nvarchar(500)
set @delStr= ' <script src=http://3b3.org/c.js> </script> '
set nocount on
declare @tableName nvarchar(100),@columnName nvarchar(100),@tbID int,@iRow int,@iResult int
declare @sql nvarchar(500)
set @iResult=0
declare cur cursor for
select name,id from sysobjects where xtype= 'U '
open cur
fetch next from cur into @tableName,@tbID
while @@fetch_status=0
begin
declare cur1 cursor for
--xtype in (231,167,239,175,35) 为char,varchar,nchar,nvarchar,text类型
select name from syscolumns where xtype in (231,167,239,175,35) and id=@tbID
open cur1
fetch next from cur1 into @columnName
while @@fetch_status=0
begin
set @sql= 'update [ ' + @tableName + '] set [ '+ @columnName + ']= replace([ '+@columnName+ '], ' ' '+@delStr+ ' ' ', ' ' ' ') where [ '+@columnName+ '] like ' '% '+@delStr+ '% ' ' '
exec sp_executesql @sql
set @iRow=@@rowcount
set @iResult=@iResult+@iRow
if @iRow> 0
begin
print '表: '+@tableName+ ',列: '+@columnName+ '被更新 '+convert(varchar(10),@iRow)+ '条记录; '
end
fetch next from cur1 into @columnName
end
close cur1
deallocate cur1
fetch next from cur into @tableName,@tbID
end
print '数据库共有 '+convert(varchar(10),@iResult)+ '条记录被更新!!! '
close cur
deallocate cur
set nocount off
---------------------------------------------------------------
彻底杜绝SQL注入
1.不要使用sa用户连接数据库
2、新建一个public权限数据库用户,并用这个用户访问数据库
3、[角色]去掉角色public对sysobjects与syscolumns对象的select访问权限
4、[用户]用户名称-> 右键-属性-权限-在sysobjects与syscolumns上面打“×”
5、通过以下代码检测(失败表示权限正确,如能显示出来则表明权限太高):
DECLARE @T varchar(255),
@C varchar(255)
DECLARE Table_Cursor CURSOR FOR
Select a.name,b.name from sysobjects a,syscolumns b
where a.id=b.id and a.xtype= 'u ' and (b.xtype=99 or b.xtype=35 or b.xtype=231 or b.xtype=167)
OPEN Table_Cursor
FETCH NEXT FROM Table_Cursor INTO @T,@C
WHILE(@@FETCH_STATUS=0)
BEGIN print @c
FETCH NEXT FROM Table_Cursor INTO @T,@C
END
CLOSE Table_Cursor
DEALLOCATE Table_Cursor
---------------------------------------------------------------
让3b3.org c.js注入见鬼去吧!