顧客サービス管理機能を構築するERP（エンタープライズ・リソース・プランニング）システムのPHP開発

CREATE TABLE customers (
    id INT PRIMARY KEY AUTO_INCREMENT,
    name VARCHAR(100) NOT NULL,
    email VARCHAR(100) NOT NULL,
    phone VARCHAR(20),
    address VARCHAR(255),
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);

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

// 创建数据库连接
$conn = new mysqli($servername, $username, $password, $dbname);

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

// 查询所有客户信息
$sql = "SELECT * FROM customers";
$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"]. " - Phone: " . $row["phone"]. " - Address: " . $row["address"]. " - Created At: " . $row["created_at"]. "<br>";
    }
} else {
    echo "0 结果";
}

// 关闭数据库连接
$conn->close();
?>

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

// 创建数据库连接
$conn = new mysqli($servername, $username, $password, $dbname);

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

// 获取通过POST请求提交的表单数据
$name = $_POST["name"];
$email = $_POST["email"];
$phone = $_POST["phone"];
$address = $_POST["address"];

// 插入新的客户信息
$sql = "INSERT INTO customers (name, email, phone, address) VALUES ('$name', '$email', '$phone', '$address')";

if ($conn->query($sql) === TRUE) {
    echo "新客户添加成功";
} else {
    echo "Error: " . $sql . "<br>" . $conn->error;
}

// 关闭数据库连接
$conn->close();
?>

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

// 创建数据库连接
$conn = new mysqli($servername, $username, $password, $dbname);

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

// 获取通过GET请求提交的客户ID
$id = $_GET["id"];

// 根据客户ID更新客户信息
$sql = "UPDATE customers SET name='Updated Name', email='updated@email.com', phone='Updated Phone', address='Updated Address' WHERE id=$id";

if ($conn->query($sql) === TRUE) {
    echo "客户信息更新成功";
} else {
    echo "Error: " . $sql . "<br>" . $conn->error;
}

// 根据客户ID删除客户信息
$sql = "DELETE FROM customers WHERE id=$id";

if ($conn->query($sql) === TRUE) {
    echo "客户删除成功";
} else {
    echo "Error: " . $sql . "<br>" . $conn->error;
}

// 关闭数据库连接
$conn->close();
?>