Home >Backend Development >PHP Tutorial >怎么php下拉菜单读取数据库

怎么php下拉菜单读取数据库

不言
不言Original
2018-05-24 14:45:086922browse

  如何php下拉菜单读取数据库
如何php下拉菜单读取数据库
现在点击线路可以从数据库查出线路,但希望通过所选线路读出车辆
表line
linename
213
223
225
267
表busname
linename        busname
213                     781
213                     782
213                     783
223                     817
223                      818
225                      901
267                      100

代码如下:

<tr>
<td width="9%" height="26" nowrap="nowrap"><p align="center"><font size="5">选择线路</font></p></td>
<td width="22%" nowrap="nowrap"><label>
<select name="select">
<?php
$link=mysql_connect("127.0.0.1","root","12345678"); 
 if(!$link) echo "没有连接成功!"; 
mysql_select_db("busap", $link); //选择数据库 
 //控制查询条件
$q = "SELECT * FROM line ORDER BY linename asc"; 
mysql_query("SET NAMES GB2312"); //防止乱码
$rs = mysql_query($q); //获取数据集
$assoc= mysql_num_rows($rs);///影响的行数 , 原来用了mysql_fetch_assoc
$row=mysql_fetch_array($rs); //只需要补充回这一行. 
$xl=$row[linename]
?> 
<option selected="selected">选择线路</option>
<?php do { ?>
<option><?php echo $row[linename]; ?></option>
<?php }while($row=mysql_fetch_array($rs)); ?>
</select>
</label></td>
</tr>
<tr>
<td height="26" nowrap="nowrap"><p align="center"><font size="5">车辆自编号</font></p></td>
<td nowrap="nowrap"><label>
<select name="select4">
<?php
$link=mysql_connect("127.0.0.1","root","12345678"); 
 if(!$link) echo "没有连接成功!"; 
mysql_select_db("busap", $link); //选择数据库 
 //控制查询条件
$q = "SELECT * FROM `{$_REQUEST[&#39;select&#39;]}` ORDER BY linename asc"; 
mysql_query("SET NAMES GB2312"); //防止乱码
$rs = mysql_query($q); //获取数据集
$assoc= mysql_num_rows($rs);///影响的行数 , 原来用了mysql_fetch_assoc
$row1=mysql_fetch_array($rs); //只需要补充回这一行. 
?> 
<option selected="selected">选择车辆</option>
<?php do { ?>
<option><?php echo $row1[2]; ?></option>
<?php }while($row=mysql_fetch_array($rs)); ?>
</select>
</label></td>
</tr>

------解决思路----------------------

<?php
  $link=mysql_connect("127.0.0.1","root","12345678");   
 if(!$link) echo "没有连接成功!";   
mysql_select_db("busap", $link);          //选择数据库 
?>
<tr>
     <td width="9%" height="26" nowrap="nowrap"><p align="center"><font size="5">选择线路</font></p></td>
     <td width="22%" nowrap="nowrap"><label>
       <select name="select">
   <?php 
 //控制查询条件
$q = "SELECT * FROM line ORDER BY linename asc";   
mysql_query("SET NAMES GB2312"); //防止乱码
$rs = mysql_query($q); //获取数据集
$assoc= mysql_num_rows($rs);///影响的行数 , 原来用了mysql_fetch_assoc
$row=mysql_fetch_array($rs); //只需要补充回这一行. 
$xl=$row[linename]
?> 
         <option selected="selected">选择线路</option>
    <?php do { ?>
Statement:
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn