$conn->close();
实例 (MySQLi - 面向过程)
$servername = "localhost";$username = "username";$password = "password";$dbname = "myDB";
// 创建连接$conn = mysqli_connect($servername, $username, $password, $dbname);// 检测连接if (!$conn) {
die("Connection failed: " . mysqli_connect_error());}
$sql = "INSERT INTO MyGuests (firstname, lastname, email)
VALUES ('John', 'Doe', 'john@example.com')";
if (mysqli_query($conn, $sql)) {
echo "新记录插入成功";} else {
echo "Error: " . $sql . "<br>" . mysqli_error($conn);}
mysqli_close($conn);
实例 (PDO)
$servername = "localhost";$username = "username";$password = "password";$dbname = "myDBPDO";
try {
$conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password); // 设置 PDO 错误模式，用于抛出异常
$conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); $sql = "INSERT INTO MyGuests (firstname, lastname, email)
VALUES ('John', 'Doe', 'john@example.com')"; // 使用 exec() ，没有结果返回
$conn->exec($sql); echo "新记录插入成功";}catch(PDOException $e){
echo $sql . "<br>" . $e->getMessage();}
$conn = null;
Epicccal
405***690@qq.com
在学习 PDO 创建数据表的时候 ， 我遇到这个报错。
最后发现问题在这里：
$conn = new PDO("mysql:host = $servername;dbname = $dbname",$username,$password);因为我写代码的习惯是" = "两边都加上空格 ， 但是在这里 dbname = $dbname 的等号两边却不可以存在空格
所以正确的写法应该是 dbname=$dbname：