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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233
src/backend/dao/QuestionsDao.java
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233
src/backend/dao/QuestionsDao.java
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package backend.dao;
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import backend.model.Questions;
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import backend.model.TestRecord;
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import backend.utils.DBConnectionPool;
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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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import java.util.Random;
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public class QuestionsDao {
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List<Questions> commonResultSet(ResultSet rs) throws SQLException{
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List<Questions> questionPoList = new ArrayList<>();
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while(rs.next()){
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Questions questions = new Questions();
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questions.setId(rs.getInt("id"));
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questions.setName(rs.getString("name"));
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questions.setDescription(rs.getString("description"));
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questions.setAnswer(rs.getString("answer"));
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questions.setFrequency(rs.getInt("frequency"));
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questionPoList.add(questions);
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}
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return questionPoList;
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}
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public List<Questions> getAll() {
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List<Questions> questionPoList = new ArrayList<>();
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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,name,description,answer,frequency from questions";
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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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questionPoList=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 questionPoList;
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}
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public Questions getById(Integer id) {
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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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Questions questionPo = null;
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PreparedStatement stmt = null;
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ResultSet rs = null;
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try {
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stmt = conn.prepareStatement("select id,name,description,answer,frequency from questions where id = ?");
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stmt.setInt(1, id);
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rs = stmt.executeQuery();
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if (rs.next()) { // 检查是否有数据
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questionPo = new Questions();
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questionPo.setId(rs.getInt("id"));
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questionPo.setName(rs.getString("name"));
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questionPo.setDescription(rs.getString("description"));
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questionPo.setAnswer(rs.getString("answer"));
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questionPo.setFrequency(rs.getInt("frequency"));
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}
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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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// 释放资源
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try {
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if (rs != null) rs.close();
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if (stmt != null) stmt.close();
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} catch (SQLException e) {
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System.out.println("资源释放异常：" + e.getMessage());
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}
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DBConnectionPool.releaseConnection(conn);
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}
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return questionPo;
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}
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public List<Questions> getByCondition(Integer frequency,String key) {
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List<Questions> questionPoList = 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,name,description,answer,frequency from questions where name like ?";
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if(frequency != null)
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sql += " and frequency = ?";
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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(frequency != null)
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stmt.setInt(2, frequency);
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ResultSet rs = stmt.executeQuery();
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questionPoList =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 questionPoList;
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}
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public boolean insert(Questions question){
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int row = 0;
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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 false;
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//2. 创建Statement对象
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String sql = "insert into questions(name,description,answer,frequency) values(?,?,?,?)";
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try{
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PreparedStatement stmt = conn.prepareStatement(sql);
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stmt.setString(1, question.getName());
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stmt.setString(2, question.getDescription());
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stmt.setString(3, question.getAnswer());
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if(question.getFrequency()==null)
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stmt.setInt(4, 0);
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else
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stmt.setInt(4, question.getFrequency());
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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("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 row > 0;
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}
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public boolean delete(Integer id){
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int row = 0;
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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 false;
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//2. 创建Statement对象
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String sql = "delete from questions 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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row = stmt.executeUpdate();
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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 row > 0;
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}
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public boolean update(Questions question){
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int row = 0;
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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 false;
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//2. 创建Statement对象
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String sql = "update questions set name = ?,description = ?,answer = ?,frequency=? where id = ?";
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try{
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PreparedStatement stmt = conn.prepareStatement(sql);
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stmt.setString(1, question.getName());
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stmt.setString(2, question.getDescription());
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stmt.setString(3, question.getAnswer());
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if(question.getFrequency()==null)
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stmt.setInt(4, 0);
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else
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stmt.setInt(4, question.getFrequency());
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stmt.setInt(5, question.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("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 row > 0;
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}
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public Questions getRandomQuestion() {
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List<Questions> questionPoList = getAll();
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Random random = new Random();
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//生成随机索引
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int index = random.nextInt(questionPoList.size());
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return questionPoList.get(index);
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}
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public Questions getByName(String name) {
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Questions questionPo = 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,name,description,answer,frequency from questions where name = ?";
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try{
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PreparedStatement stmt = conn.prepareStatement(sql);
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stmt.setString(1, name);
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ResultSet rs = stmt.executeQuery();
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questionPo = commonResultSet(rs).get(0);
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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 questionPo;
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}
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// public static void main(String[] args) {
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// WordDao wordDao = new WordDao();
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// //查询
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// List<WordPo> wordPoList = wordDao.getByCondition(3,"v");
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// if(wordPoList != null)
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// for(WordPo wordPo:wordPoList)
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// System.out.println(wordPo.getWord());
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// //增加
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// wordDao.insert(new WordPo("test", "test", "test", 1));
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// //更新
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// wordDao.updata(new WordPo(1, 1, "test", "test", "test"));
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// }
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}
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