Conditions for converting commercial loans to provident fund loans: A simple example of implementing multi-condition query

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：
$c
$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":
$query.=" && price<'".$price2."'";
break;
}
}
if($area2!=""){
switch($area1){
case "大于":
$query.=" && area>'".$area2."'";  //面积
break;
case "等于":
$query.=" && area='".$area2."'";
break;
case "小于":
$query.=" && area<'".$area2."'";
break;
}
}
switch($pubdate){ //发布日期
case "本星期内":
$query.=" && TO_DAYS(NOW()) - TO_DAYS(date)<=7";
break;
case "一个月内":
$query.=" && TO_DAYS(NOW()) - TO_DAYS(date)<=30";
break;
case "三个月内":
$query.=" && TO_DAYS(NOW()) - TO_DAYS(date)<=91";
break;
case "六个月内":
$query.=" && TO_DAYS(NOW()) - TO_DAYS(date)<=183";
break;
}
if($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

";
                                                                                                                                                                                                                                                 ; echo " Page ".$page."/".$page_count." ";
                                                                                                                        echo "}
echo";
if ($ prev_page & lt; 1) {
echo "|" S}
else {
echo "& lt; a href = '$ PATH_INFO? Page = $ prev_page' & gt; | Previous page | & lt;/a & gt;"
}

if ($ night_page & gt ; $ page_count){
             echo "|Next page|";
                                                                                                                                                                                                                       echo " /a>";
}
                                                                                                                                                                         echo "}
echo" & lt;/div & gt; ";
}
else {
echo" & lt; p align = 'center' & gt; there is no house lease information yet!
?> Please contact me (yk_lingyun@21cn.com) and corrections are welcome!
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The above introduces the conditions for converting commercial loans to provident fund loans. An example of a simple multi-condition query, including the conditions for converting commercial loans to provident fund loans. I hope it will be helpful to friends who are interested in PHP tutorials.