• 删除sql注入


    三种方法:第一种针对单个表 第二种针对单个表字段太多的情况(print输出有字数限制) 第三种针对于单个库(最强模式可直接将库中所有表的所有字符串类型字段全部更新)

    第一种:直接导出sql语句
    declare
    @curTable varchar(500), @FilterStr varchar(500);--过滤字符串 字符串及之后的数据将被替换为空 set @FilterStr='</title><style>.alx2{'; set @curTable='users_log_table'; DECLARE @SQLList varchar(8000), @tableName VARCHAR(1000), @name VARCHAR(1000), @type VARCHAR(1000); set @SQLList=''; BEGIN -- 定义游标. DECLARE c_test_main CURSOR FAST_FORWARD FOR -- select [dbid],[name] from sysdatabases where dbid>4;--查询数据库名称 select b.name as tableName,a.name as columnName,c.name as columnType from syscolumns a inner join sysobjects b on a.id=b.id inner join systypes c on a.xtype=c.xtype WHERE a.id=OBJECT_ID(N'['+@curTable+']') And c.name not like 'sysname' ORDER BY colid -- 打开游标. OPEN c_test_main; WHILE 1=1 BEGIN -- 填充数据. FETCH NEXT FROM c_test_main INTO @tableName,@name,@type; -- 假如未检索到数据,退出循环. IF @@fetch_status!= 0 BREAK; if @type='varchar' or @type='nvarchar' begin --select @tableName,@name,@type; set @SQLList=@SQLList+';update ['+@tableName+'] set ['+@name+']=replace(['+@name+'],isnull(substring(['+@name+'], case charindex('''+@FilterStr+''',['+@name+']) when 0 then len(['+@name+'])+1 else charindex('''+@FilterStr+''',['+@name+']) end ,len(['+@name+'])),''''),''''); '+(char(10)+char(13)); end else if @type='ntext' or @type='text' begin set @SQLList=@SQLList+';update ['+@tableName+'] set ['+@name+']=cast(replace(cast(['+@name+'] as varchar(8000)), isnull(substring(cast(['+@name+'] as varchar(8000)),case charindex('''+@FilterStr+''',cast(['+@name+'] as varchar(8000))) when 0 then len(cast(['+@name+'] as varchar(8000)))+1 else charindex('''+@FilterStr+''',cast(['+@name+'] as varchar(8000))) end,len(cast(['+@name+'] as varchar(8000)))),''''),'''') as ntext ); '+(char(10)+char(13)); end END; -- 关闭游标 CLOSE c_test_main; -- 释放游标. DEALLOCATE c_test_main; END print @SQLList;



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  • 原文地址:https://www.cnblogs.com/xyzhuzhou/p/3858308.html
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