php 获取数据库名

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

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

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

// 获取数据库名
$sql = "SELECT DATABASE()";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
    // 输出数据
    while($row = $result->fetch_assoc()) {
        echo "当前数据库: " . $row["DATABASE()"];
    }
} else {
    echo "0 结果";
}
$conn->close();
?>

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

try {
    $conn = new PDO("mysql:host=$servername", $username, $password);
    // 设置 PDO 错误模式为异常
    $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

    // 获取数据库名
    $sql = "SELECT DATABASE()";
    $stmt = $conn->query($sql);
    $row = $stmt->fetch(PDO::FETCH_ASSOC);
    echo "当前数据库: " . $row["DATABASE()"];

} catch(PDOException $e) {
    echo "连接失败: " . $e->getMessage();
}

$conn = null;
?>