PHP 多条件查询（汽车表）

主页面：

 <h1>汽车查询页面</h1>
 <br />
 <?php
     include("./DBDA.class.php");
     $db = new DBDA();

     $cx="";
     $value="";

     $tj1 = " 1=1"; //条件1的判断
     $tj2 = " 1=1"; //条件2的判断

     if(!empty($_POST["name"]))
     {
         $tj1 = " Name like '%{$_POST['name']}%'";
     }
     if(!empty($_POST["brand"]))
     {
         $tj2 = " Brand = '{$_POST['brand']}'";
     }

     $cx = " where {$tj1} and {$tj2} ";
 ?>
 <form action="test.php" method="post">
 <div>
     请输入名称：<input type="text" name="name" value="<?php echo $value; ?>" /> &nbsp;
     系列：<input type="text" name="brand" />&nbsp;
     <input type="submit" value="查询" />
 </div>
 </form>
 <br />
 <table width="100%" border="1" cellpadding="0" cellspacing="0">
     <tr>
         <td>代号</td>
         <td>汽车名称</td>
         <td>系列</td>
         <td>价格</td>
         <td>油耗</td>
         <td>功率</td>
     </tr>

     <?php

         $sql = "select * from Car".$cx;
         $attr = $db->Query($sql);
         echo $sql;

         foreach($attr as $v)
         {
             //处理Name
             $rp = "<span style='color:red'>{$value}</span>";
             $str = str_replace($value,$rp,$v[1]);
             echo "<tr>
                 <td>{$v[0]}</td>
                 <td>{$str}</td>
                 <td>{$v[2]}</td>
                 <td>{$v[7]}</td>
                 <td>{$v[4]}</td>
                 <td>{$v[5]}</td>
             </tr>";
         }

     ?>

 </table>

封装类页面

<?php

class DBDA
{
    public $host = "localhost";    //数据库地址
    public $uid = "root";    //数据库用户名
    public $pwd = "123";    //数据库密码

    //执行SQL语句,返回相应的结果的方法
    //参数：$sql代表要执行的SQL语句,$type是SQL语句类型0代表查询1代表其他,$db代表要操作的数据库
    public function Query($sql,$type=0,$db="mydb")
    {
        //1.造连接对象
        $dbconnect = new MySQLi($this->host,$this->uid,$this->pwd,$db);
        //2.判断连接是否出错
        !mysqli_connect_error() or die("连接失败！");
        //3.执行SQL语句
        $result = $dbconnect->query($sql);

        if($type==0)
        {
            return $result->fetch_all();
        }
        else
        {
            return $result;
        }
    }
}
?>