javamysql课设源码

Java MySQL课设源码主要包括以下几个部分：

1、数据库连接和操作

2、数据表设计和创建

3、数据的增删改查

4、高级功能，如事务处理、存储过程等

下面是一个简单的Java MySQL课设源码示例：

数据库连接和操作

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
public class DBHelper {
    private static final String URL = "jdbc:mysql://localhost:3306/test";
    private static final String USER = "root";
    private static final String PASSWORD = "123456";
    public static Connection getConnection() {
        Connection conn = null;
        try {
            Class.forName("com.mysql.jdbc.Driver");
            conn = DriverManager.getConnection(URL, USER, PASSWORD);
        } catch (ClassNotFoundException | SQLException e) {
            e.printStackTrace();
        }
        return conn;
    }
}

数据表设计和创建

CREATE TABLE user (
  id int(11) NOT NULL AUTO_INCREMENT,
  username varchar(255) NOT NULL,
  password varchar(255) NOT NULL,
  PRIMARY KEY (id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

数据的增删改查

// 增加数据
public void addUser(String username, String password) {
    String sql = "INSERT INTO user (username, password) VALUES (?, ?)";
    try (Connection conn = DBHelper.getConnection();
         PreparedStatement pstmt = conn.prepareStatement(sql)) {
        pstmt.setString(1, username);
        pstmt.setString(2, password);
        pstmt.executeUpdate();
    } catch (SQLException e) {
        e.printStackTrace();
    }
}
// 删除数据
public void deleteUser(int id) {
    String sql = "DELETE FROM user WHERE id = ?";
    try (Connection conn = DBHelper.getConnection();
         PreparedStatement pstmt = conn.prepareStatement(sql)) {
        pstmt.setInt(1, id);
        pstmt.executeUpdate();
    } catch (SQLException e) {
        e.printStackTrace();
    }
}
// 修改数据
public void updateUser(int id, String newUsername, String newPassword) {
    String sql = "UPDATE user SET username = ?, password = ? WHERE id = ?";
    try (Connection conn = DBHelper.getConnection();
         PreparedStatement pstmt = conn.prepareStatement(sql)) {
        pstmt.setString(1, newUsername);
        pstmt.setString(2, newPassword);
        pstmt.setInt(3, id);
        pstmt.executeUpdate();
    } catch (SQLException e) {
        e.printStackTrace();
    }
}
// 查询数据
public User findUserById(int id) {
    User user = null;
    String sql = "SELECT * FROM user WHERE id = ?";
    try (Connection conn = DBHelper.getConnection();
         PreparedStatement pstmt = conn.prepareStatement(sql)) {
        pstmt.setInt(1, id);
        ResultSet resultSet = pstmt.executeQuery();
        if (resultSet.next()) {
            user = new User();
            user.setId(resultSet.getInt("id"));
            user.setUsername(resultSet.getString("username"));
            user.setPassword(resultSet.getString("password"));
        }
    } catch (SQLException e) {
        e.printStackTrace();
    }
    return user;
}

高级功能，如事务处理、存储过程等（略）