SQL脚本：高效清除SQL注入恶意数据

/***********批量替换一个数据库中所有表中所有记录************/
declare @delStr nvarchar(500)
set @delStr='这里是要替换的字符'
/**********以下为操作实体************/
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) 为char,varchar,nchar,nvarchar类型
        select name from syscolumns where xtype in (231,167,239,175) 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