输入条件，进行筛选，得出答案
进行封装：（使用方便）
<?php
class DBDA
{
public $host = "localhost";
public $uid = "root";
public $pwd = "";
//执行SQL语句的方法
//参数：$sql代表要执行的SQL语句，$type代表SQL语句类型，0代表的是查询，1代表的是增删改$db代表的是操作的数据库
public function Query($sql,$type=0,$db="mydb")
{
$dbconnect = new MySQLi($this->host,$this->uid,$this->pwd,$db);
!mysqli_connect_error() or die("连接失败");
$result = $dbconnect->query($sql);
if($type==0)
{
return $result->fetch_all();
}
else
{
return $result;
}
}
}
查询页面：（单条件查询）
<body>
<h1>汽车查询页面</h1>
<br />
<?php
include("DBDA.class.php");
$db = new DBDA();
$cx="";
$value="";
if(!empty($_POST["name"]))
{
$name = $_POST["name"];
$cx = " where name like ‘%{$name}%‘";//查询字符串
$value = $name;
}
?>
<form action="chaxun.php" method="post">
<div>
请输入名称：<input type="text" name="name" value="<?php echo $value;?>"/>
请输入系列：<input type="text" name="brand"/>
<input type="submit" value="查询"/>
</div>
<br/>
</form>
<table width="100%" border="1" cellpadding="0" cellspacing="0">
<tr>
<td>代号</td>
<td>汽车名称</td>
<td>价格</td>
<td>油耗</td>
<td>功率</td>
</tr>
<?php
$sql = "select * from Car".$cx;
$attr = $db->Query($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>{$v[7]}</td>
<td>{$v[4]}</td>
<td>{$v[5]}</td>
</tr>";
}
?>
</table>
</body
多条件查询：
<body>
<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
$tj2 = " 1=1";
if(!empty($_POST["name"]))
{
$tj1 = " Name like ‘%{$_POST[‘name‘]}%‘";
}
if(!empty($_POST["brand"]))
{
$tj2 = " Brand = ‘{$_POST[‘brand‘]}‘";
}
$cx = " where {$tj1} and {$tj2} ";//条件2的判断
?>
<form action="查询0506/chaxunduo.php" method="post">
<div>
请输入名称：<input type="text" name="name" value="<?php echo $value;?>"/>
请输入系列：<input type="text" name="brand" />
<input type="submit" value="查询"/>
</div>
<br/>
</form>
<table width="100%" border="1" cellpadding="0" cellspacing="0">
<tr>
<td>代号</td>
<td>汽车名称</td>
<td>价格</td>
<td>油耗</td>
<td>功率</td>
</tr>
<?php
$sql = "select * from Car".$cx;
echo $sql;
$attr = $db->Query($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>{$v[7]}</td>
<td>{$v[4]}</td>
<td>{$v[5]}</td>
</tr>";
}
?>
</table>
</body>
时间： 2024-11-22 23:27:35