php mysql异常捕获

try {
    // 可能会抛出异常的代码
} catch (Exception $e) {
    // 处理异常的代码
}

<?php
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "myDB";

// 创建连接
$conn = new mysqli($servername, $username, $password, $dbname);

// 检查连接
if ($conn->connect_error) {
    die("连接失败: " . $conn->connect_error);
}

try {
    // 执行查询
    $sql = "SELECT id, firstname, lastname FROM MyGuests";
    $result = $conn->query($sql);

    if ($result === false) {
        throw new Exception("查询失败: " . $conn->error);
    }

    // 处理结果
    while ($row = $result->fetch_assoc()) {
        echo "id: " . $row["id"]. " - Name: " . $row["firstname"]. " " . $row["lastname"]. "<br>";
    }
} catch (Exception $e) {
    echo "捕获到异常: " . $e->getMessage();
} finally {
    $conn->close();
}
?>