PHP关键词查询和多条件查询

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
</head>

<body>
<h1>查询页面</h1>
<form action="gjcchaxun.php" method="post">
<div>
请输入汽车名称:
<input type="text" name="name" />
<input type="submit" value="查询" />
</div>
</form>
<table width="100%"  cellpadding="0" cellspacing="0">
        <tr>
        <td>代号</td>
        <td>名称</td>
        <td>系列</td>
        <td>上市时间</td>
        <td>油耗</td>
        <td>功率</td>
    </tr>
    <?php
        include("DBDA.class.php");
        $db=new DBDA();
        $tj="";
        $name="";
        if(!empty($_POST))
        {
                $name=$_POST['name'];
                $tj="where Name like '%{$name}%'";
        }
        $sql="select * from car ".$tj;//car后记得加空格
        $attr=$db->Query($sql);
        foreach($attr as $v)
        {
                //处理关键字
                $v[1];$name;
                //$re="<mark>{$name}</mark>";
                $re="<span >{$name}</span>";
                $str=str_replace($name,$re,$v[1]);
                echo"<tr>
        <td>{$v[0]}</td>
        <td>{$str}</td>
        <td>{$v[2]}</td>
        <td>{$v[3]}</td>
        <td>{$v[4]}</td>
        <td>{$v[5]}</td>
    </tr>";
        }
        ?>
</table>
</body>
</html>

  

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
</head>

<body>
<h1>查询页面</h1>
<form action="duotiaojianchaxun.php" method="post">
<div>
请输入汽车名称:
<input type="text" name="name" />
请输入系列代号:
<input type="text" name="brand"/>
<input type="submit" value="查询" />
</div>
</form>
<table width="100%"  cellpadding="0" cellspacing="0">
        <tr>
        <td>代号</td>
        <td>名称</td>
        <td>系列</td>
        <td>上市时间</td>
        <td>油耗</td>
        <td>功率</td>
    </tr>
    <?php
        //一般来说做查询的时候,用户不输入任何内容就是查询所有的
        include("DBDA.class.php");
        $db=new DBDA();
        //多条件查询
        $tj1="1=1";
        $tj2="1=1";
        $name="";
        if(!empty($_POST))
        {
                if($_POST['name']!="")
                {
                        $name=$_POST['name'];
                        $tj1="Name like '%{$name}%'";
                }
                if($_POST['brand']!="")
                {
                        $tj2="Brand='{$_POST['brand']}'";
                }
        }
        $cxtj=" where ".$tj1." and ".$tj2;
        $sql="select * from car ".$cxtj;//car后记得加空格
        echo $sql;
        $attr=$db->Query($sql);
        foreach($attr as $v)
        {
                //处理关键字
                $v[1];$name;
                //$re="<mark>{$name}</mark>";
                $re="<span >{$name}</span>";
                $str=str_replace($name,$re,$v[1]);
                echo"<tr>
        <td>{$v[0]}</td>
        <td>{$str}</td>
        <td>{$v[2]}</td>
        <td>{$v[3]}</td>
        <td>{$v[4]}</td>
        <td>{$v[5]}</td>
    </tr>";
        }
        ?>
</table>
</body>
</html>