PHP的强大数据库支持为数据管理和操作提供便利

<?php
$servername = "localhost";
$username = "root";
$password = "123456";
$dbname = "myDB";

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

// 检测连接是否成功
if ($conn->connect_error) {
    die("连接失败: " . $conn->connect_error);
}
echo "连接成功";
?>

<?php
$sql = "INSERT INTO users (name, age, email) VALUES ('John', 25, 'john@example.com')";

if ($conn->query($sql) === TRUE) {
    echo "数据插入成功";
} else {
    echo "数据插入失败: " . $conn->error;
}
?>

<?php
$sql = "SELECT * FROM users";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
    while($row = $result->fetch_assoc()) {
        echo "姓名: " . $row["name"]. " 年龄: " . $row["age"]. " 邮箱: " . $row["email"]. "<br>";
    }
} else {
    echo "没有数据";
}
?>

<?php
$sql = "UPDATE users SET age=30 WHERE name='John'";

if ($conn->query($sql) === TRUE) {
    echo "数据更新成功";
} else {
    echo "数据更新失败: " . $conn->error;
}
?>

<?php
$sql = "DELETE FROM users WHERE age=30";

if ($conn->query($sql) === TRUE) {
    echo "数据删除成功";
} else {
    echo "数据删除失败: " . $conn->error;
}
?>