PHP 재고 관리 시스템의 공급자 신용 평가 기능을 위한 코드 생성

CREATE TABLE supplier (
    id INT PRIMARY KEY AUTO_INCREMENT,
    name VARCHAR(255) NOT NULL,
    contact_person VARCHAR(255) NOT NULL,
    contact_number VARCHAR(255) NOT NULL
);

CREATE TABLE credit_evaluation (
    id INT PRIMARY KEY AUTO_INCREMENT,
    supplier_id INT NOT NULL,
    evaluation_date DATE NOT NULL,
    evaluation_score INT NOT NULL,
    FOREIGN KEY (supplier_id) REFERENCES supplier(id)
);

<?php
// 数据库连接配置
$servername = "localhost";
$username = "root";
$password = "secret";
$dbname = "inventory_management";

// 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);
}
?>

<?php
// 供应商信息录入
if($_SERVER["REQUEST_METHOD"] == "POST") {
    $name = $_POST['name'];
    $contact_person = $_POST['contact_person'];
    $contact_number = $_POST['contact_number'];
    
    $sql = "INSERT INTO supplier (name, contact_person, contact_number) VALUES ('$name', '$contact_person', '$contact_number')";
    
    if ($conn->query($sql) === TRUE) {
        echo "供应商信息录入成功！";
    } else {
        echo "供应商信息录入失败：" . $conn->error;
    }
}
?>

<?php
// 供应商信用评估
if($_SERVER["REQUEST_METHOD"] == "POST") {
    $supplier_id = $_POST['supplier_id'];
    $evaluation_date = $_POST['evaluation_date'];
    $evaluation_score = $_POST['evaluation_score'];
    
    $sql = "INSERT INTO credit_evaluation (supplier_id, evaluation_date, evaluation_score) VALUES ('$supplier_id', '$evaluation_date', '$evaluation_score')";
    
    if ($conn->query($sql) === TRUE) {
        echo "信用评估成功！";
    } else {
        echo "信用评估失败：" . $conn->error;
    }
}
?>

<?php
// 查询供应商信用评估数据
$sql = "SELECT supplier.name, credit_evaluation.evaluation_date, credit_evaluation.evaluation_score
        FROM supplier
        INNER JOIN credit_evaluation ON supplier.id = credit_evaluation.supplier_id
        WHERE supplier.id = 1";

$result = $conn->query($sql);

if ($result->num_rows > 0) {
    while($row = $result->fetch_assoc()) {
        echo "供应商姓名：" . $row["name"]. " - 评估日期：" . $row["evaluation_date"]. " - 评估分数：" . $row["evaluation_score"]. "<br>";
    }
} else {
    echo "暂无评估数据";
}
?>