php的查询功能（如何通过查询条件获取相应表的字段）
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------解决方案--------------------
result = mysql_query(select * from books where checked=‘$checked’ );
------解决方案--------------------
if(isset($_post['checked'])){
@$result = mysql_query(select * from books,$db);
    echo 
\n;                                      
    echo 
             isbn
             author
             title
             price
             ;                                                     
    echo 
\n;                                                 
    //循环遍历