php7連接MySQL實(shí)現(xiàn)簡(jiǎn)易查詢程序的方法

!DOCTYPE html>
html lang="cn">
head>
 meta charset="UTF-8">
 title>分班查詢系統(tǒng)/title>
/head>
body>
form action="cx.php" method="post">
 p>學(xué)號(hào):input type="text" name="xuehao">/p>
 p>姓名: input type="text" name="xingming">/p>
 p>input type="submit" name="submit" value="查詢">/p>
/form>
/body>
/html>

?php
$server="localhost";//主機(jī)的IP地址
$db_username="root";//數(shù)據(jù)庫(kù)用戶名
$db_password="123456";//數(shù)據(jù)庫(kù)密碼
$db_name = "data";

?php
header("Content-Type: text/html; charset=utf8");
if(!isset($_POST["submit"]))
{
 exit("未檢測(cè)到表單提交");
}//檢測(cè)是否有submit操作
include ("config.php");
$Sid = $_POST['Sid'];//post獲得學(xué)號(hào)表單值
$name = $_POST['name'];//post獲得姓名表單值
echo "table style='border: solid 1px black;'>";
echo "tr>th>學(xué)號(hào)/th>th>姓名/th>th>班級(jí)/th>/tr>";
class TableRows extends RecursiveIteratorIterator
{
 function __construct($it)
 {
  parent::__construct($it, self::LEAVES_ONLY);
 }

 function current()
 {
  return "td style='width:150px;border:1px solid black;'>" . parent::current() . "/td>";
 }

 function beginChildren()
 {
  echo "tr>";
 }

 function endChildren()
 {
  echo "/tr>" . "\n";
 }
}
try {
 $conn = new PDO("mysql:host=$server;dbname=$db_name", $db_username, $db_password);
 $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
 $stmt = $conn->prepare("SELECT Sid, name, class FROM data where Sid=$Sid and name='$name'");
 $stmt->execute();

 // 設(shè)置結(jié)果集為關(guān)聯(lián)數(shù)組
 $result = $stmt->setFetchMode(PDO::FETCH_ASSOC);
 foreach (new TableRows(new RecursiveArrayIterator($stmt->fetchAll())) as $k => $v) {
  echo $v;
 }
} catch (PDOException $e) {
 echo "Error: " . $e->getMessage();
}
$conn = null;
echo "/table>";