Bagaimana untuk membangunkan sistem pengambilan kerja yang mudah menggunakan MySQL dan Java

CREATE TABLE position (
  id INT PRIMARY KEY AUTO_INCREMENT,
  name VARCHAR(100) NOT NULL,
  description TEXT,
  salary DECIMAL(10, 2)
);

CREATE TABLE applicant (
  id INT PRIMARY KEY AUTO_INCREMENT,
  name VARCHAR(100) NOT NULL,
  contact VARCHAR(100),
  education VARCHAR(100)
);

CREATE TABLE recruitment (
  id INT PRIMARY KEY AUTO_INCREMENT,
  position_id INT,
  applicant_id INT,
  apply_time TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
  FOREIGN KEY (position_id) REFERENCES position (id),
  FOREIGN KEY (applicant_id) REFERENCES applicant (id)
);

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;

public class DBUtil {
  private static final String URL = "jdbc:mysql://localhost:3306/recruitment_system";
  private static final String USERNAME = "root";
  private static final String PASSWORD = "password";

  public static Connection getConnection() throws SQLException {
    return DriverManager.getConnection(URL, USERNAME, PASSWORD);
  }
}

public class Position {
  private int id;
  private String name;
  private String description;
  private double salary;

  // 省略构造函数和访问器方法

  // 添加职位
  public void addPosition() {
    try (Connection conn = DBUtil.getConnection();
         PreparedStatement stmt = conn.prepareStatement("INSERT INTO position (name, description, salary) VALUES (?, ?, ?)")) {
      stmt.setString(1, this.name);
      stmt.setString(2, this.description);
      stmt.setDouble(3, this.salary);
      stmt.executeUpdate();
      System.out.println("职位添加成功！");
    } catch (SQLException e) {
      e.printStackTrace();
    }
  }
}

public class Applicant {
  private int id;
  private String name;
  private String contact;
  private String education;

  // 省略构造函数和访问器方法

  // 添加申请人
  public void addApplicant() {
    try (Connection conn = DBUtil.getConnection();
         PreparedStatement stmt = conn.prepareStatement("INSERT INTO applicant (name, contact, education) VALUES (?, ?, ?)")) {
      stmt.setString(1, this.name);
      stmt.setString(2, this.contact);
      stmt.setString(3, this.education);
      stmt.executeUpdate();
      System.out.println("申请人添加成功！");
    } catch (SQLException e) {
      e.printStackTrace();
    }
  }
}

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class Recruitment {
  // 查询招聘信息
  public void displayRecruitment() {
    try (Connection conn = DBUtil.getConnection();
         PreparedStatement stmt = conn.prepareStatement("SELECT * FROM recruitment LEFT JOIN position ON recruitment.position_id = position.id LEFT JOIN applicant ON recruitment.applicant_id = applicant.id");
         ResultSet rs = stmt.executeQuery()) {
      while (rs.next()) {
        System.out.println("职位名称：" + rs.getString("position.name"));
        System.out.println("申请人姓名：" + rs.getString("applicant.name"));
        System.out.println("申请时间：" + rs.getTimestamp("apply_time"));
        System.out.println();
      }
    } catch (SQLException e) {
      e.printStackTrace();
    }
  }
}

public class Main {
  public static void main(String[] args) {
    Position position = new Position();
    position.setName("Java开发工程师");
    position.setDescription("负责 Java 后端开发工作");
    position.setSalary(10000.00);
    position.addPosition();

    Applicant applicant = new Applicant();
    applicant.setName("张三");
    applicant.setContact("13812345678");
    applicant.setEducation("本科");
    applicant.addApplicant();

    Recruitment recruitment = new Recruitment();
    recruitment.displayRecruitment();
  }
}