学生选课系统----CourseArrangeDAO

Posted 2020-08-22

/**
 * @author 李佩
 * 
 * @version v1
 * 
 * @time 2016/12/5 19:20
 * 
 * @program  课程安排信息与数据库进行操作的类
 *
 */

package com.csms.dao;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import com.csms.DBLink;
import com.csms.entity.CourseArrange;
import com.csms.entity.SelectCourse;

public class CourseArrangeDAO {
	// 查询课程信息的所有信息
	public List<CourseArrange> searchCourseInformation() {
		// 创建一个课程安排的对象
		CourseArrange arrange = null;

		// 创建一个List容器保存数据对象
		List<CourseArrange> arrangeList = new ArrayList<CourseArrange>();

		// 1. 取得数据库连接
		Connection conn = DBLink.getConn();

		// 2. 写出数据库查询语句
		String sql = "SELECT * FROM coursearrange";

		// 3. 设置查询变量
		PreparedStatement ptm = null;
		ResultSet rs = null;

		try {
			// 4. 将数据库语句送入数据库，执行查询
			ptm = conn.prepareStatement(sql);
			rs = ptm.executeQuery();
			while (rs.next()) {
				arrange = new CourseArrange();
				arrange.setCourseID(rs.getString("courseID"));
				arrange.setCourseTeacher(rs.getString("courseTeacher"));
				arrange.setCourseName(rs.getString("courseName"));
				arrange.setCourseGridits(rs.getInt("courseCridits"));
				arrange.setCourseTimes(rs.getInt("courseTime"));
				arrange.setCourseType(rs.getString("courseType"));
				arrange.setCourseNumber(rs.getInt("courseNumber"));
				arrange.setCourseSelectNumber(rs.getInt("courseSelectNumber"));
				arrange.setCourseArrange(rs.getString("courseArrage"));
				arrangeList.add(arrange);
			}
			rs.close();
		} catch (SQLException e) {
			e.printStackTrace();
		} finally {
			try {
				if (ptm != null)
					ptm.close();
			} catch (SQLException e) {
				e.printStackTrace();
			}
		}
		return arrangeList;
	}

	// 联合课程安排表和课程已选表查询学生的课程，任课老师，学生的学分，成绩和上课安排
	public List<Object> searchSpecificInformation(String studentID) {
		// 设置安排课程对象
		CourseArrange ca = null;
		// 设置已选课程的对象
		SelectCourse sc = null;
		// 创建一个List容器保存数据对象
		List<Object> list = new ArrayList<Object>();
		System.out.println("studentID: " + studentID);
		// 1. 取得数据库连接对象
		Connection conn = DBLink.getConn();

		// 2. 写出查询sql语句段
		String sql = "SELECT CA.courseName,CA.courseTeacher,CA.courseCridits,SC.courseGrade,CA.courseArrage FROM coursearrange CA,selectcourse SC WHERE SC.courseID=CA.courseID AND SC.studentID=?";

		// 设置查询变量
		PreparedStatement ptm = null;
		ResultSet rs = null;

		try {
			// 3. 将数据库语句插入，执行查询
			ptm = conn.prepareStatement(sql);
			ptm.setString(1, studentID);
			rs = ptm.executeQuery();

			while (rs.next()) {
				ca = new CourseArrange();
				sc = new SelectCourse();

				ca.setCourseName(rs.getString("courseName"));
				ca.setCourseTeacher(rs.getString("courseTeacher"));
				ca.setCourseGridits(rs.getInt("courseCridits"));
				ca.setCourseArrange(rs.getString("courseArrage"));
				sc.setStudentGrade(rs.getDouble("courseGrade"));
				list.add(ca);
				list.add(sc);
			}
			rs.close();
		} catch (SQLException e) {
			e.printStackTrace();
		} finally {
			try {
				if (ptm != null)
					ptm.close();
			} catch (SQLException e) {
				e.printStackTrace();
			}
		}
		System.out.println("List size: " + list.size());
		return list;
	}

	// 查询课程名和课程id
	public List<CourseArrange> selectNameAndIDForCourse(String studentID) {
		List<CourseArrange> list = new ArrayList<CourseArrange>();
		CourseArrange ca = null;
		Connection conn = DBLink.getConn();
		String sql = "SELECT CA.courseName,CA.courseID,CA.courseArrage,CA.courseCridits FROM coursearrange CA,selectcourse SC WHERE SC.courseID=CA.courseID AND SC.studentID=?";

		// 设置查询变量
		PreparedStatement ptm = null;
		ResultSet rs = null;

		try {
			// 3. 将数据库语句插入，执行查询
			ptm = conn.prepareStatement(sql);
			ptm.setString(1, studentID);
			rs = ptm.executeQuery();

			while (rs.next()) {
				ca = new CourseArrange();
				ca.setCourseName(rs.getString("courseName"));
				ca.setCourseID(rs.getString("courseID"));
				ca.setCourseArrange(rs.getString("courseArrage"));
				ca.setCourseGridits(rs.getInt("courseCridits"));
				list.add(ca);
			}
			rs.close();
		} catch (SQLException e) {
			e.printStackTrace();
		} finally {
			try {
				if (ptm != null)
					ptm.close();
			} catch (SQLException e) {
				e.printStackTrace();
			}
		}

		return list;
	}

	// 插入课程安排信息
	public void insertCourseArrange(CourseArrange ca){
		Connection conn = DBLink.getConn();
		String sql ="INSERT INTO coursearrange (courseID,courseTeacher,courseName,courseCridits,courseTime,courseType,courseNumber,courseSelectNumber,courseArrage) VALUES 	(?,?,?,?,?,?,?,?,?)";

		PreparedStatement ptm = null;
		try{
			ptm = conn.prepareStatement(sql);
			ptm.setString(1, ca.getCourseID());
			ptm.setString(2, ca.getCourseTeacher());
			ptm.setString(3, ca.getCourseName());
			ptm.setInt(4, ca.getCourseGridits());
			ptm.setInt(5, ca.getCourseTimes());
			ptm.setString(6, ca.getCourseType());
			ptm.setInt(7, ca.getCourseNumber());
			ptm.setInt(8, ca.getCourseSelectNumber());
			ptm.setString(9, ca.getCourseArrange());
			ptm.execute();
		}catch(SQLException e){
			e.printStackTrace();
		}finally{
			try{
				if(ptm!=null)
					ptm.close();
			}catch(SQLException e){
				e.printStackTrace();
			}
		}
	}

	// 删除排课信息
	public void deleteArrageCourseInformation(String id){
		Connection conn = DBLink.getConn();
		String sql = "DELETE FROM coursearrange WHERE courseID=?";
		PreparedStatement ptm = null;
		try{
			ptm = conn.prepareStatement(sql);
			ptm.setString(1, id);
			ptm.execute();
		}catch(SQLException e){
			e.printStackTrace();
		}finally{
			try{
				if(ptm != null){
					ptm.close();
				}
			}catch(SQLException e){
				e.printStackTrace();
			}
		}
	}
	
	// 查看所有课程信息
	public List<CourseArrange> searchAllCourseArrange(){
		List<CourseArrange> list = new ArrayList<CourseArrange>();
		CourseArrange ca = null;
		Connection conn = DBLink.getConn();
		String sql = "SELECT courseID,courseTeacher,courseName,courseCridits,courseTime,courseType,courseNumber,courseSelectNumber,courseArrage FROM coursearrange";
		PreparedStatement ptm = null;
		ResultSet rs = null;
		try{
			ptm = conn.prepareStatement(sql);
			rs = ptm.executeQuery();
			while(rs.next()){
				ca = new CourseArrange();
				ca.setCourseID(rs.getString("courseID"));
				ca.setCourseTeacher(rs.getString("courseTeacher"));
				ca.setCourseName(rs.getString("courseName"));
				ca.setCourseGridits(rs.getInt("courseCridits"));
				ca.setCourseTimes(rs.getInt("courseTime"));
				ca.setCourseType(rs.getString("courseType"));
				ca.setCourseNumber(rs.getInt("courseNumber"));
				ca.setCourseSelectNumber(rs.getInt("courseSelectNumber"));
				ca.setCourseArrange(rs.getString("courseArrage"));
				list.add(ca);
			}
			rs.close();
		}catch(SQLException e){
			e.printStackTrace();
		}finally{
			try{
				if(ptm!=null){
					ptm.close();
				}
			}catch(SQLException e){
				e.printStackTrace();
			}
		}
		return list;
	}
}