PHP实例：用PHP简单实现多条件查询

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。

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.=” && 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：

<?php
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 “<tr>”;
echo “<td width=’15′ height=’12′><img src=’image/home2.gif’ width=’14′ height=’14′></td>”;
echo “<td width=’540′ height=’12′>myrow[id]&nbsp;myrow[tradetype]&nbsp;myrow[address]&nbsp;myrow[wuye](myrow[housetype])<font style=’font-size:9pt’>[myrow[date]]</font>”;
echo “</td>”;
echo “<td width=’75′ height=’12′><a href=’view_d.php?code=myrow[code]\' target=\'_blank\'>详细内容</a></td>";
echo "</tr>";
}
}
else echo "<tr><td><div align=\'center\'><img src=\'image/sorry.gif\'><br><br>没有找到满足你条件的记录</div></td></tr>";
}
prev_page=page-1;
next_page=page+1;
echo "<div align=\'center\'>";
echo "&nbsp;第".page."/".page_count."页&nbsp";
if (page<=1){
echo "|第一页|";
}
else{
echo "<a href=\'PATH_INFO?page=1\'>|第一页|</a>";
}
echo " ";
if (prev_page<1){
echo "|上一页|";
}
else{
echo "<a href=\'PATH_INFO?page=prev_page\'>|上一页|</a>";
}
echo " ";
if (next_page>page_count){
echo "|下一页|";
}
else{
echo "<a href=\'PATH_INFO?page=next_page\'>|下一页|</a>";
}
echo " ";
if (page>=page_count){
echo "|最后一页|";
}
else{
echo "<a href=\'PATH_INFO?page=page_count\'>|最后一页|</a>";
}
echo "</div>";
}
else{
echo "<p align=\'center\'>现在还没有房屋租赁信息!</p>";
}
echo "<hr width="100%" size="1">";
?>
</table>