Java数据库仓库管理系统的代码实现涉及到多个方面,包括数据库连接、数据操作、界面设计等。以下是一个简单的示例,使用Java和JDBC(Java Database Connectivity)连接MySQL数据库,并执行一些基本操作:,,“
java,import java.sql.Connection;,import java.sql.DriverManager;,import java.sql.ResultSet;,import java.sql.SQLException;,import java.sql.Statement;,,public class WarehouseManagementSystem {, private static final String DB_URL = "jdbc:mysql://localhost:3306/warehouse";, private static final String DB_USER = "root";, private static final String DB_PASSWORD = "password";,, public static void main(String[] args) {, try {, // 加载驱动, Class.forName("com.mysql.jdbc.Driver");, // 获取数据库连接, Connection connection = DriverManager.getConnection(DB_URL, DB_USER, DB_PASSWORD);, // 创建Statement对象, Statement statement = connection.createStatement();, // 执行查询, ResultSet resultSet = statement.executeQuery("SELECT * FROM products");, // 处理结果集, while (resultSet.next()) {, System.out.println("Product ID: " + resultSet.getInt("id") + ", Product Name: " + resultSet.getString("name"));, }, // 关闭资源, resultSet.close();, statement.close();, connection.close();, } catch (ClassNotFoundException e) {, e.printStackTrace();, } catch (SQLException e) {, e.printStackTrace();, }, },},
“,,这个示例仅用于演示如何使用Java和JDBC连接MySQL数据库并执行查询操作。实际的仓库管理系统可能需要更复杂的功能和界面设计。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:
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:
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:
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:
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。
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