311 lines
12 KiB
Java
311 lines
12 KiB
Java
package dao.impl;
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import dao.LeaveRequestDAO;
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import model.ApprovalStatus;
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import model.LeaveRequest;
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import model.Student;
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import util.DatabaseUtil;
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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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/**
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* LeaveRequestDAO接口的实现类，提供请假申请的数据库访问操作
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* 实现了LeaveRequestDAO接口定义的所有方法，包括基础的CRUD操作和特定的查询方法
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* 处理请假申请的创建、更新、查询等操作，支持按学生、状态等条件进行查询
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*/
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public class LeaveRequestDAOImpl implements LeaveRequestDAO {
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/**
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* 插入一条请假申请记录
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* 将LeaveRequest对象的信息保存到数据库中，并获取生成的主键ID
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*
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* @param request 要插入的请假申请对象，包含申请的详细信息
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* @return 影响的行数，插入成功返回1，失败返回0
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*/
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@Override
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public int insert(LeaveRequest request) {
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if (request == null || request.getStudent() == null) {
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return 0;
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}
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String sql = "INSERT INTO leave_requests (student_id, start_time, end_time, status, " +
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"duration, location, reason_type, reason_detail, is_leaving_city, " +
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"request_time) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)";
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try (Connection conn = DatabaseUtil.getConnection();
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PreparedStatement stmt = conn.prepareStatement(sql, Statement.RETURN_GENERATED_KEYS)) {
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// 设置预处理语句的参数
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stmt.setInt(1, request.getStudent().getId());
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stmt.setTimestamp(2, new Timestamp(request.getStartTime().getTime()));
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stmt.setTimestamp(3, new Timestamp(request.getEndTime().getTime()));
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stmt.setString(4, request.getStatus().name());
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stmt.setDouble(5, request.getDuration());
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stmt.setString(6, request.getLocation());
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stmt.setString(7, request.getReasonType());
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stmt.setString(8, request.getReasonDetail());
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stmt.setBoolean(9, request.isLeavingCity());
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stmt.setTimestamp(10, new Timestamp(request.getRequestTime().getTime()));
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int affectedRows = stmt.executeUpdate();
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if (affectedRows == 0) {
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return 0;
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}
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// 获取自动生成的主键
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try (ResultSet generatedKeys = stmt.getGeneratedKeys()) {
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if (generatedKeys.next()) {
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request.setId(generatedKeys.getInt(1));
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}
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}
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return affectedRows;
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} catch (SQLException e) {
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e.printStackTrace();
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return 0;
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}
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}
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/**
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* 根据ID删除请假申请记录
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*
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* @param id 要删除的请假申请记录的ID
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* @return 影响的行数，删除成功返回1，失败返回0
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*/
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@Override
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public int deleteById(int id) {
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String sql = "DELETE FROM leave_requests WHERE id = ?";
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try (Connection conn = DatabaseUtil.getConnection();
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PreparedStatement stmt = conn.prepareStatement(sql)) {
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stmt.setInt(1, id);
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return stmt.executeUpdate();
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} catch (SQLException e) {
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e.printStackTrace();
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return 0;
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}
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}
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/**
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* 更新请假申请信息
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* 根据请假申请对象的ID更新其他字段的值
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*
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* @param request 包含更新信息的请假申请对象
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* @return 影响的行数，更新成功返回1，失败返回0
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*/
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@Override
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public int update(LeaveRequest request) {
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if (request == null || request.getStudent() == null) {
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return 0;
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}
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String sql = "UPDATE leave_requests SET student_id = ?, start_time = ?, " +
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"end_time = ?, status = ?, duration = ?, location = ?, " +
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"reason_type = ?, reason_detail = ?, is_leaving_city = ?, " +
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"request_time = ? WHERE id = ?";
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try (Connection conn = DatabaseUtil.getConnection();
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PreparedStatement stmt = conn.prepareStatement(sql)) {
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// 设置预处理语句的参数
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stmt.setInt(1, request.getStudent().getId());
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stmt.setTimestamp(2, new Timestamp(request.getStartTime().getTime()));
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stmt.setTimestamp(3, new Timestamp(request.getEndTime().getTime()));
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stmt.setString(4, request.getStatus().name());
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stmt.setDouble(5, request.getDuration());
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stmt.setString(6, request.getLocation());
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stmt.setString(7, request.getReasonType());
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stmt.setString(8, request.getReasonDetail());
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stmt.setBoolean(9, request.isLeavingCity());
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stmt.setTimestamp(10, new Timestamp(request.getRequestTime().getTime()));
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stmt.setInt(11, request.getId());
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return stmt.executeUpdate();
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} catch (SQLException e) {
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e.printStackTrace();
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return 0;
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}
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}
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/**
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* 根据ID查询请假申请信息
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* 同时会关联查询学生信息
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*
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* @param id 要查询的请假申请ID
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* @return 如果找到则返回请假申请对象，否则返回null
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*/
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@Override
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public LeaveRequest findById(int id) {
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String sql = "SELECT lr.*, s.id as student_id, s.student_id as student_number, " +
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"s.name, s.class_name, s.contact, s.college, s.major " +
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"FROM leave_requests lr " +
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"JOIN students s ON lr.student_id = s.id " +
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"WHERE lr.id = ?";
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try (Connection conn = DatabaseUtil.getConnection();
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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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if (rs.next()) {
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return mapResultSetToLeaveRequest(rs);
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}
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} catch (SQLException e) {
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e.printStackTrace();
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}
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return null;
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}
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/**
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* 查询所有请假申请记录
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* 同时会关联查询每条记录对应的学生信息
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*
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* @return 包含所有请假申请对象的列表，如果没有记录则返回空列表
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*/
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@Override
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public List<LeaveRequest> findAll() {
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List<LeaveRequest> requests = new ArrayList<>();
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String sql = "SELECT lr.*, s.id as student_id, s.student_id as student_number, " +
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"s.name, s.class_name, s.contact, s.college, s.major " +
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"FROM leave_requests lr " +
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"JOIN students s ON lr.student_id = s.id";
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try (Connection conn = DatabaseUtil.getConnection();
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Statement stmt = conn.createStatement();
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ResultSet rs = stmt.executeQuery(sql)) {
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while (rs.next()) {
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requests.add(mapResultSetToLeaveRequest(rs));
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}
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} catch (SQLException e) {
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e.printStackTrace();
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}
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return requests;
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}
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/**
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* 查询指定学生的所有请假申请记录
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* 按请求时间降序排序
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*
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* @param studentId 学生的ID
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* @return 该学生的所有请假申请列表，如果没有记录则返回空列表
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*/
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@Override
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public List<LeaveRequest> findByStudentId(int studentId) {
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List<LeaveRequest> requests = new ArrayList<>();
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String sql = "SELECT lr.*, s.id as student_id, s.student_id as student_number, " +
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"s.name, s.class_name, s.contact, s.college, s.major " +
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"FROM leave_requests lr " +
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"JOIN students s ON lr.student_id = s.id " +
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"WHERE lr.student_id = ? ORDER BY lr.request_time DESC";
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try (Connection conn = DatabaseUtil.getConnection();
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PreparedStatement stmt = conn.prepareStatement(sql)) {
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stmt.setInt(1, studentId);
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ResultSet rs = stmt.executeQuery();
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while (rs.next()) {
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requests.add(mapResultSetToLeaveRequest(rs));
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}
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} catch (SQLException e) {
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e.printStackTrace();
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}
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return requests;
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}
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/**
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* 查询指定状态的所有请假申请记录
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*
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* @param status 请假申请的状态
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* @return 符合状态条件的请假申请列表，如果没有记录则返回空列表
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*/
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@Override
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public List<LeaveRequest> findByStatus(ApprovalStatus status) {
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List<LeaveRequest> requests = new ArrayList<>();
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String sql = "SELECT lr.*, s.id as student_id, s.student_id as student_number, " +
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"s.name, s.class_name, s.contact, s.college, s.major " +
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"FROM leave_requests lr " +
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"JOIN students s ON lr.student_id = s.id " +
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"WHERE lr.status = ? ORDER BY lr.request_time DESC";
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try (Connection conn = DatabaseUtil.getConnection();
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PreparedStatement stmt = conn.prepareStatement(sql)) {
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stmt.setString(1, status.name());
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ResultSet rs = stmt.executeQuery();
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while (rs.next()) {
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requests.add(mapResultSetToLeaveRequest(rs));
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}
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} catch (SQLException e) {
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e.printStackTrace();
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}
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return requests;
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}
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/**
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* 更新请假申请状态
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*
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* @param id 请假申请ID
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* @param status 新的状态
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* @param approverComment 审批备注
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* @return 影响的行数，更新成功返回1，失败返回0
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*/
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@Override
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public int updateStatus(int id, ApprovalStatus status, String approverComment) {
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String sql = "UPDATE leave_requests SET status = ?, approval_comment = ? WHERE id = ?";
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try (Connection conn = DatabaseUtil.getConnection();
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PreparedStatement stmt = conn.prepareStatement(sql)) {
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stmt.setString(1, status.name());
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stmt.setString(2, approverComment);
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stmt.setInt(3, id);
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return stmt.executeUpdate();
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} catch (SQLException e) {
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e.printStackTrace();
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return 0;
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}
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}
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/**
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* 将ResultSet映射为LeaveRequest对象
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* 从结果集中提取数据并创建LeaveRequest实例，同时创建关联的Student对象
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*
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* @param rs 包含请假申请和学生数据的ResultSet对象
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* @return 映射后的LeaveRequest对象
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* @throws SQLException 如果访问ResultSet时发生错误
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*/
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private LeaveRequest mapResultSetToLeaveRequest(ResultSet rs) throws SQLException {
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// 创建学生对象
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Student student = new Student();
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student.setId(rs.getInt("student_id"));
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student.setStudentId(rs.getString("student_number"));
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student.setName(rs.getString("name"));
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student.setClassName(rs.getString("class_name"));
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student.setContact(rs.getString("contact"));
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student.setCollege(rs.getString("college"));
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student.setMajor(rs.getString("major"));
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// 创建请假申请对象
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LeaveRequest request = new LeaveRequest();
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request.setId(rs.getInt("id"));
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request.setStudent(student);
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request.setStartTime(rs.getTimestamp("start_time"));
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request.setEndTime(rs.getTimestamp("end_time"));
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request.setStatus(ApprovalStatus.valueOf(rs.getString("status")));
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request.setApproverComment(rs.getString("approval_comment"));
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request.setDuration(rs.getDouble("duration"));
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request.setLocation(rs.getString("location"));
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request.setReasonType(rs.getString("reason_type"));
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request.setReasonDetail(rs.getString("reason_detail"));
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request.setLeavingCity(rs.getBoolean("is_leaving_city"));
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request.setRequestTime(rs.getTimestamp("request_time"));
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Timestamp approvalTime = rs.getTimestamp("approval_time");
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if (approvalTime != null) {
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request.setApprovalTime(approvalTime);
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}
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return request;
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}
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}
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