完成了用户管理界面，测试界面，测试记录，排行榜，以及权限控制，并最终美化了界面
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203
src/backend/dao/UserDao.java
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203
src/backend/dao/UserDao.java
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package backend.dao;
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import backend.model.User;
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import backend.service.AuthService;
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import backend.utils.DBConnectionPool;
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import backend.utils.DBHelper;
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import java.sql.*;
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import java.util.ArrayList;
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import java.util.List;
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public class UserDao {
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List<User> commonResultSet(ResultSet rs) throws SQLException{
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List<User> userPoList = new ArrayList<>();
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while(rs.next()){
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User user = new User();
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user.setId(rs.getInt("id"));
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user.setUsername(rs.getString("username"));
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user.setPassword(rs.getString("password"));
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user.setRole(rs.getString("role"));
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user.setEmail(rs.getString("email"));
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user.setCreatedAt(rs.getDate("createdAt"));
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userPoList.add(user);
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}
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return userPoList;
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}
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public User findByUsername(String username) {
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User user = null;
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//1. 从连接池中创建数据库连接
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Connection conn = DBHelper.getInstance().getConnection();
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//2. 创建Statement对象
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String sql = "select id,username,password,role,email,createdAt from USER where username = ?";
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try {
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PreparedStatement stmt = conn.prepareStatement(sql);
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stmt.setString(1, username);
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ResultSet rs = stmt.executeQuery();
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while (rs.next()) {
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user = new User();
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user.setId(rs.getInt("id"));
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user.setUsername(rs.getString("username"));
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user.setPassword(rs.getString("password"));
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user.setRole(rs.getString("role"));
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user.setEmail(rs.getString("email"));
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user.setCreatedAt(rs.getDate("createdAt"));
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}
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} catch (SQLException e) {
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System.out.println("查询用户失败: " + e.getMessage());
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}
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return user;
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}
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public User findById(int id) {
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User user = null;
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//1. 从连接池中创建数据库连接
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Connection conn = DBHelper.getInstance().getConnection();
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//2. 创建Statement对象
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String sql = "select id,username,password,role,email,createdAt from USER where id = ?";
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try{
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PreparedStatement stmt = conn.prepareStatement(sql);
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stmt.setInt(1,id);
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ResultSet rs = stmt.executeQuery();
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while(rs.next()) {
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user = new User();
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user.setId(rs.getInt("id"));
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user.setUsername(rs.getString("username"));
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user.setPassword(rs.getString("password"));
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user.setRole(rs.getString("role"));
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user.setEmail(rs.getString("email"));
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user.setCreatedAt(rs.getDate("createdAt"));
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}
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}catch (SQLException e) {
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System.out.println("查询用户失败: " + e.getMessage());
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}
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return user;
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}
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public boolean addUser(User user) {
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Connection conn = DBHelper.getInstance().getConnection();
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int row=0;
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if(conn==null)
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return false;
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String sql = "insert into USER (username,password,role,email,createdAt) values (?,?,?,?,?)";
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try{
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PreparedStatement stmt = conn.prepareStatement(sql);
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stmt.setString(1,user.getUsername());
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stmt.setString(2,user.getPassword());
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stmt.setString(3,user.getRole());
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stmt.setString(4,user.getEmail());
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stmt.setDate(5,user.getCreatedAt());
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row = stmt.executeUpdate();
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stmt.close();
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DBConnectionPool.releaseConnection(conn);
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} catch (SQLException e) {
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System.out.println("添加用户失败: " + e.getMessage());
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}
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return row>0;
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}
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public boolean updateUser(User user) {
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Connection conn = DBHelper.getInstance().getConnection();
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int row = 0;
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if(conn==null)
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return false;
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String sql = "update USER set username = ?,password = ?,role = ?,email = ?,createdAt = ? where id = ?";
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try{
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PreparedStatement stmt = conn.prepareStatement(sql);
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stmt.setString(1,user.getUsername());
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stmt.setString(2,user.getPassword());
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stmt.setString(3,user.getRole());
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stmt.setString(4,user.getEmail());
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stmt.setDate(5,user.getCreatedAt());
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stmt.setInt(6,user.getId());
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row = stmt.executeUpdate();
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stmt.close();
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} catch (SQLException e) {
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System.out.println("更新用户失败: " + e.getMessage());
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}finally {
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DBConnectionPool.releaseConnection(conn);
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}
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return row>0;
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}
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public boolean deleteUser(int id) {
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Connection conn = DBHelper.getInstance().getConnection();
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String sql = "delete from USER where id = ?";
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int row = 0;
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try{
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PreparedStatement stmt = conn.prepareStatement(sql);
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stmt.setInt(1,id);
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row = stmt.executeUpdate() ;
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} catch (SQLException e) {
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System.out.println("删除用户失败: " + e.getMessage());
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}
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return row>0;
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}
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public List<User> findAll() {
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List<User> userPoList = new ArrayList<>();
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Connection conn = DBHelper.getInstance().getConnection();
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String sql = "select id,username,password,role,email,createdAt from USER";
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try {
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PreparedStatement stmt = conn.prepareStatement(sql);
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ResultSet rs = stmt.executeQuery();
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while (rs.next()) {
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User user = new User();
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user.setId(rs.getInt("id"));
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user.setUsername(rs.getString("username"));
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user.setPassword(rs.getString("password"));
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user.setRole(rs.getString("role"));
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user.setEmail(rs.getString("email"));
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user.setCreatedAt(rs.getDate("createdAt"));
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userPoList.add(user);
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}
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}catch (SQLException e) {
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System.out.println("查询所有用户失败: " + e.getMessage());
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}
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return userPoList;
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}
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public List<User> findByCondition(String role, String key) {
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List<User> userPoList = null;
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//1. 从连接池中拿到连接
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Connection conn = DBConnectionPool.getConnection();
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if(conn==null)
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return null;
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//2. 创建Statement对象
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String sql = "select id,username,password,role,email,createdAt from USER where username like ?";
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if(role != null)
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sql += " and role = ?";
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try{
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PreparedStatement stmt = conn.prepareStatement(sql);
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stmt.setString(1, "%"+key+"%");
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if(role != null)
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stmt.setString(2, role);
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ResultSet rs = stmt.executeQuery();
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userPoList =commonResultSet(rs);
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rs.close();
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stmt.close();
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}catch(SQLException e){
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System.out.println("数据库异常："+ e.getMessage());
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}finally {
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DBConnectionPool.releaseConnection(conn);
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}
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return userPoList;
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}
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public static void main(String[] args) {
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UserDao userDao = new UserDao();
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AuthService authService = new AuthService();
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User user= userDao.findById(2);
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System.out.println(user.getRole());
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user.setRole("admin");
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System.out.println(user.getRole());
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userDao.updateUser(user);
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System.out.println(userDao.findById(2).getRole());
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}
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}
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