在PHP中,使用MySQLi或PDO扩展来连接和操作MySQL数据库。这里我将分别展示如何使用MySQLi和PDO的fetch方法获取数据。
使用MySQLi:
首先,确保已经安装了MySQLi扩展并在PHP中启用了它。创建一个MySQL数据库连接:$servername = "localhost";$username = "your_username";$password = "your_password";$dbname = "your_database";// 创建连接$conn = new mysqli($servername, $username, $password, $dbname);// 检查连接if ($conn->connect_error) { die("连接失败: " . $conn->connect_error);}执行一个SQL查询并获取数据:$sql = "SELECT id, name, email FROM users";$result = $conn->query($sql);if ($result->num_rows > 0) { // 输出每行数据 while($row = $result->fetch_assoc()) { echo "id: " . $row["id"]. " - Name: " . $row["name"]. " - Email: " . $row["email"]. "<br>"; }} else { echo "0 结果";}$conn->close();使用PDO:
确保已经安装了PDO扩展并在PHP中启用了它。创建一个MySQL数据库连接:$servername = "localhost";$username = "your_username";$password = "your_password";$dbname = "your_database";try { $conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password); // 设置 PDO 错误模式为异常 $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);} catch (PDOException $e) { echo "连接失败: " . $e->getMessage();}执行一个SQL查询并获取数据:$sql = "SELECT id, name, email FROM users";$stmt = $conn->prepare($sql);$stmt->execute();$result = $stmt->fetchAll(PDO::FETCH_ASSOC);if (!empty($result)) { // 输出每行数据 foreach ($result as $row) { echo "id: " . $row["id"]. " - Name: " . $row["name"]. " - Email: " . $row["email"]. "<br>"; }} else { echo "0 结果";}$conn = null;以上示例展示了如何使用MySQLi和PDO的fetch方法从MySQL数据库中获取数据。注意,为了简洁起见,我没有在这里展示如何创建和填充数据库表。在实际应用中,你需要先创建一个包含数据的表。