$SQLCD="update shuju set isbn2=$140 isbn2, author2='$author2, press=' $press, Publication_date='$Publication_date, douban_score=' $douban_score, Binding='$Binding, the Catalog=' $Catalog where spu_id='$i1";


$SQL="SELECT description_units FROM 140 shuju LIMIT {$I}, 1";


How can this optimization