PHP开发的供应商评价统计模块在企业资源计划（ERP）系统中的应用

CREATE TABLE `supplier` (
  `id` INT(11) NOT NULL AUTO_INCREMENT,
  `name` VARCHAR(50) NOT NULL,
  `contact` VARCHAR(50) NOT NULL,
  `phone` VARCHAR(20) NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8;

CREATE TABLE `evaluation` (
  `id` INT(11) NOT NULL AUTO_INCREMENT,
  `supplier_id` INT(11) NOT NULL,
  `delivery_rate` DECIMAL(5,2) NOT NULL,
  `comments` TEXT NOT NULL,
  PRIMARY KEY (`id`),
  FOREIGN KEY (`supplier_id`) REFERENCES `supplier` (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8;

// 连接数据库
$host = 'localhost';
$db = 'erp';
$user = 'root';
$password = 'password';
$dsn = "mysql:host=$host;dbname=$db;charset=utf8";
$pdo = new PDO($dsn, $user, $password);

// 添加供应商信息
function addSupplier($name, $contact, $phone) {
    global $pdo;
    $stmt = $pdo->prepare("INSERT INTO supplier (name, contact, phone) VALUES (?, ?, ?)");
    $stmt->execute([$name, $contact, $phone]);
    return $pdo->lastInsertId();
}

// 添加评价记录
function addEvaluation($supplierId, $deliveryRate, $comments) {
    global $pdo;
    $stmt = $pdo->prepare("INSERT INTO evaluation (supplier_id, delivery_rate, comments) VALUES (?, ?, ?)");
    $stmt->execute([$supplierId, $deliveryRate, $comments]);
    return $pdo->lastInsertId();
}

// 生成评价报表
function generateReport() {
    global $pdo;
    $stmt = $pdo->prepare("SELECT supplier.name, AVG(evaluation.delivery_rate) as average_rate 
                          FROM supplier INNER JOIN evaluation ON supplier.id = evaluation.supplier_id 
                          GROUP BY supplier.id");
    $stmt->execute();
    return $stmt->fetchAll(PDO::FETCH_ASSOC);
}