单条件查询
<body>
<div align="center" style="90%;">
<h1>数据查询</h1>
<form method="post" action="test-1.php">
<div>请输入汽车品牌:<input type="text" name="name"/></div>
<br />
<div><input type="submit" value="查询" name="chaxun"/></div>
<br />
</form>
<div>
<table width="90%" border="1" align="center" style="text-align:center;">
<tr>
<td>汽车代号</td>
<td>汽车名字</td>
<td>系列代号</td>
<td>汽车油耗</td>
<td>汽车价格</td>
</tr>
<?php
$tj = " 1=1 ";//恒成立条件
$name = "";
if(!empty($_POST)){
$name = $_POST["name"];
$tj = " name like '%{$name}%' " ;
}
$db = new MySQLi("localhost","root","123456","crud");
$sql = "select * from car where {$tj}";
$result = $db->query($sql);
if($result){
$arr = $result->fetch_all();
foreach($arr as $v){
$v[1];$name;
$carname = str_replace($name,"<font color='#FF0000'>{$name}</font>",$v[1]);//字符串替换
echo"<tr>
<td>{$v[0]}</td>
<td>{$carname}</td>
<td>{$v[2]}</td>
<td>{$v[4]}</td>
<td>{$v[7]}</td>
</tr>";
}
}
?>
</table>
</div>
</div>
</body>
多条件查询
<body>
<div align="center" style="90%;">
<h1>数据查询</h1>
<form method="post" action="test-1.php">
<div>请输入汽车品牌:<input type="text" name="name"/>
请输入系列代号:<input type="text" name="brand"/></div> <!--两个条件-->
<br />
<div><input type="submit" value="查询" name="chaxun"/></div>
<br />
</form>
<div>
<table width="90%" border="1" align="center" style="text-align:center;">
<tr>
<td>汽车代号</td>
<td>汽车名字</td>
<td>系列代号</td>
<td>汽车油耗</td>
<td>汽车价格</td>
</tr>
<?php
$tj = " 1=1 ";//恒成立条件
$tj1 = " 1=1 ";//恒成立条件
$name = "";
$brand = "";
if(!empty($_POST["name"])){
$name = $_POST["name"];
$tj = " name like '%{$name}%' " ;
}
if(!empty($_POST["brand"])){
$brand = $_POST["brand"];
$tj1 = " brand = '{$brand}' " ;
}
$db = new MySQLi("localhost","root","123456","crud");
$sql = "select * from car where {$tj} and {$tj1}";
$result = $db->query($sql);
if($result){
$arr = $result->fetch_all();
if(!empty($arr)){
echo "数据不存在！";
}else{
foreach($arr as $v){
$v[1];$name;
$v[2];$brand;
$carname = str_replace($name,"<font color='#FF0000'>{$name}</font>",$v[1]);//字符串替换
$carbrand = str_replace($brand,"<font color='#FF0000'>{$brand}</font>",$v[2]);
echo"<tr>
<td>{$v[0]}</td>
<td>{$carname}</td>
<td>{$carbrand}</td>
<td>{$v[4]}</td>
<td>{$v[7]}</td>
</tr>";
}
}
}
?>
</table>
</div>
</div>
</body>
