php修改数据表信息

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

// 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);
}

// 修改表结构：添加新列
$sql = "ALTER TABLE table_name ADD COLUMN new_column_name datatype";
if ($conn->query($sql) === TRUE) {
    echo "新列添加成功";
} else {
    echo "错误: " . $sql . "<br>" . $conn->error;
}

// 修改表名
$sql = "RENAME TABLE old_table_name TO new_table_name";
if ($conn->query($sql) === TRUE) {
    echo "表名修改成功";
} else {
    echo "错误: " . $sql . "<br>" . $conn->error;
}

// 修改表的存储引擎
$sql = "ALTER TABLE table_name ENGINE=InnoDB";
if ($conn->query($sql) === TRUE) {
    echo "存储引擎修改成功";
} else {
    echo "错误: " . $sql . "<br>" . $conn->error;
}

$conn->close();
?>