java数据库仓库管理系统代码怎么写

由于代码较长，我将为您提供一个简化版的Java数据库仓库管理系统（JDBC）示例，您可以根据需要进行扩展和修改。

我们需要创建一个数据库连接类，用于建立与数据库的连接：

Java

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
public class DatabaseConnection {
    private static final String URL = "jdbc:mysql://localhost:3306/your_database_name";
    private static final String USERNAME = "your_username";
    private static final String PASSWORD = "your_password";
    public static Connection getConnection() {
        Connection connection = null;
        try {
            Class.forName("com.mysql.jdbc.Driver");
            connection = DriverManager.getConnection(URL, USERNAME, PASSWORD);
        } catch (ClassNotFoundException | SQLException e) {
            e.printStackTrace();
        }
        return connection;
    }
} 

接下来，我们创建一个用户表的实体类：

Java

public class User {
    private int id;
    private String name;
    private String email;
    public User(int id, String name, String email) {
        this.id = id;
        this.name = name;
        this.email = email;
    }
    // Getter and Setter methods
} 

我们创建一个用户表的DAO类，用于操作数据库中的用户表：

Java

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
public class UserDao {
    public List<User> getAllUsers() {
        List<User> users = new ArrayList<>();
        String query = "SELECT * FROM users";
        try (Connection connection = DatabaseConnection.getConnection();
             PreparedStatement preparedStatement = connection.prepareStatement(query);
             ResultSet resultSet = preparedStatement.executeQuery()) {
            while (resultSet.next()) {
                int id = resultSet.getInt("id");
                String name = resultSet.getString("name");
                String email = resultSet.getString("email");
                users.add(new User(id, name, email));
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return users;
    }
    public void addUser(User user) {
        String query = "INSERT INTO users (name, email) VALUES (?, ?)";
        try (Connection connection = DatabaseConnection.getConnection();
             PreparedStatement preparedStatement = connection.prepareStatement(query)) {
            preparedStatement.setString(1, user.getName());
            preparedStatement.setString(2, user.getEmail());
            preparedStatement.executeUpdate();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
} 

我们在主类中测试我们的数据库仓库管理系统：

Java

public class Main {
    public static void main(String[] args) {
        UserDao userDao = new UserDao();
        // Add a new user
        User newUser = new User(0, "张三", "zhangsan@example.com");
        userDao.addUser(newUser);
        // Get all users
        List<User> users = userDao.getAllUsers();
        for (User user : users) {
            System.out.println("ID: " + user.getId() + ", Name: " + user.getName() + ", Email: " + user.getEmail());
        }
    }
} 

这个示例使用了MySQL数据库，您需要根据您的实际情况修改数据库连接信息和驱动程序，您还可以根据需要添加更多的功能，如更新、删除和查询用户等。