A simple example of implementing multi-condition query_PHP tutorial

在我们的网站设计过程中，经常会用到多条件查询，本文的源码是一个二手房屋查询的例子。在本例中，我们要实现能够通过地理位置，物业类型，房屋价格，房屋面积及信息发布日期等多个条件查询到客户所需的资料。以下是实现过程。
查询条件界面(略)：
查询文件（search.php）
一、生成查询语句：

$conn=mysql_connect("localhost","root","");
$db=mysql_select_db("lingyun");
$query="select * from message where tradetype='".$tradetype."'";  //交易类型，如出租，出售
$SQL=$SQL . "wuye='" . $wuye . "'";
if($housetype!="不限"){
$query.=" && housetype='".$housetype."'"; //房屋类型，如二室一厅，三室二厅
}
if($degree!="不限"){
$query.=" && degree='".$degree."'";  //新旧程度
}
if($wuye!="不限"){
$query.=" && wuye='".$wuye."'";   //物业类型 如住房，商铺
}
if($price2!=""){
switch($price1){
case "大于":
$query.=" && price>'".$price2."'";   //价格
break;
case "等于":
$query.=" && price='".$price2."'";
break;
case "小于":
$query.=" && pricebreak;
}
}
if($area2!=""){
switch($area1){
case "大于":
$query.=" && area>'".$area2."'";  //面积
break;
case "等于":
$query.=" && area='".$area2."'";
break;
case "小于":
$query.=" && areabreak;
}
}
switch($pubdate){                   //发布日期
case "本星期内":
$query.=" && TO_DAYS(NOW()) - TO_DAYS(date)break;
case "一个月内":
$query.=" && TO_DAYS(NOW()) - TO_DAYS(date)break;
case "三个月内":
$query.=" && TO_DAYS(NOW()) - TO_DAYS(date)break;
case "六个月内":
$query.=" && TO_DAYS(NOW()) - TO_DAYS(date)break;
}
if($address!=""){
$query.=" &&  address like '%$address%'";  //地址
}
if(!$page){
$page=1;
}
?>

二、输出查询结果：
     if ($page){
     $page_size=20;
     $result=mysql_query($query);
     #$message_count=mysql_result($result,0,"total");
     $message_count=10;
     $page_count=ceil($message_count/$page_size);
     $offset=($page-1)*$page_size;
     $query=$query." order by date desc limit $offset, $page_size";
     $result=mysql_query($query);
     if($result){
     $rows=mysql_num_rows($result);
     if($rows!=0){
     while($myrow=mysql_fetch_array($result)){
     echo "

";
     echo "";
     echo "$myrow[id] $myrow[tradetype] $myrow[address] $myrow[wuye]($myrow[housetype])[$myrow[date]]";
     echo "";
     echo "详细内容";
     echo "";
         }
       }
     else echo "

没有找到满足你条件的记录

";
                                                                       align='center'>";
echo " Page ".$page."/".$page_count." ";
if ($page echo " First Page|";
                                                                                                                                                                                                                                                                                               ; }
                                                                                              echo "|Previous page|";
                                                                                           echo "|Next page|";
                                                                                                                                                                                                           ; 
             }
             echo " ";                                                                                        " |Last page|"; > else{
echo "

There is no rental information yet!

";
echo "

---

";
?>


If there are any problems during use, please contact me (yk_lingyun@21cn.com), Corrections are welcome!


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