基于SSH的学校教学管理系统 学生选课系统 源代码

package com.stuman.dao.imp; import java.sql.Connection; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; import java.util.ArrayList; import java.util.List; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.hibernate.HibernateException; import org.hibernate.Session; import com.stuman.dao.EnrolDAO; import com.stuman.dao.hibernate.HibernateUtil; import com.stuman.domain.Classes; import com.stuman.domain.Enrol; import com.stuman.domain.EnrolId; import com.stuman.domain.Score; import com.stuman.domain.Student; public class EnrolDAOImp implements EnrolDAO { private static Log log = LogFactory.getLog(EnrolDAOImp.class); public List getEnrol() { // TODO Auto-generated method enrob try { Session s = HibernateUtil.currentSession(); HibernateUtil.beginTransaction(); List results = s.createQuery("from Enrol enro").list(); HibernateUtil.commitTransaction(); HibernateUtil.closeSession(); if (results != null && results.size() > 0) { return results; } } catch (HibernateException e) { log.fatal(e); } return null; } public boolean deleteEnrolByID(EnrolId id) { // TODO Auto-generated method enrob try { Session s = HibernateUtil.currentSession(); HibernateUtil.beginTransaction(); String classes_id = ((Classes) id.getClasses()).getId(); String stu_id = ((Student) id.getStudent()).getId(); // System.out.println("in deleteEnrolByID " + classes_id + " " // + stu_id); s.createQuery("delete com.stuman.domain.Enrol where class_id = '" + classes_id + "' and stu_id = '" + stu_id + "'"); HibernateUtil.commitTransaction(); HibernateUtil.closeSession(); return true; } catch (HibernateException e) { log.fatal(e); } return false; } public Enrol getEnrolByID(EnrolId id) { // TODO Auto-generated method enrob try { Session s = HibernateUtil.currentSession(); HibernateUtil.beginTransaction(); // Enrol enro = (Enrol) s.load(Enrol.class, id); String classes_id = ((Classes) id.getClasses()).getId(); String stu_id = ((Student) id.getStudent()).getId(); System.out.println("in deleteEnrolByID " + classes_id + " " + stu_id); Enrol enro = (Enrol)s.createQuery("from Enrol where class_id = '" + classes_id + "' and stu_id = '" + stu_id + "'").list().get(0); HibernateUtil.commitTransaction(); HibernateUtil.closeSession(); return enro; } catch (HibernateException e) { log.fatal(e); } return null; } public boolean updateEnrol(Enrol enro) { // TODO Auto-generated method enrob try { Session s = HibernateUtil.currentSession(); HibernateUtil.beginTransaction(); s.update(enro); // System.out.println("update Enrol id =" + enro.getId()); HibernateUtil.commitTransaction(); HibernateUtil.closeSession(); return true; } catch (HibernateException e) { log.fatal(e); } return false; } public boolean saveEnrol(Enrol enro) { // TODO Auto-generated method enrob try { Session s = HibernateUtil.currentSession(); HibernateUtil.beginTransaction(); // Enrol oldEenro = (Enrol) s.load(Enrol.class, id); s.saveOrUpdate(enro); // System.out.println("save Enrol id =" + enrob.getId()); HibernateUtil.commitTransaction(); HibernateUtil.closeSession(); return true; } catch (HibernateException e) { log.fatal(e); } return false; } public boolean addEnrol(String stuid, String classid) throws SQLException { // TODO Auto-generated method stub try { // 获得Session Session s = HibernateUtil.currentSession(); // 执行操作 Connection conn = s.connection(); Statement sql = conn.createStatement(); System.out.println("insert into enrol ( class_id, stu_id) values('"+classid+"','"+stuid+"')"); sql.execute("insert into enrol ( class_id, stu_id) values('"+classid+"','"+stuid+"')"); sql.close(); // 关闭Session HibernateUtil.closeSession(); return true; } catch (HibernateException e) { log.fatal(e); } return false; } public List getByStuId(String stuid) throws SQLException { // TODO Auto-generated method stub ArrayList results = new ArrayList(); try { // 获得Session Session s = HibernateUtil.currentSession(); // 执行操作 Connection conn = s.connection(); Statement sql = conn.createStatement(); ResultSet rs = sql.executeQuery("select name, mark, score from enrol,classes,course where stu_id = '"+stuid+"' and class_id = classes.id and course.id = classes.cour_id"); while (rs.next()) { Score score = new Score(); score.setCourse(rs.getString(1)); score.setMark(rs.getString(2)); score.setScore(rs.getString(3)); results.add(score); } rs.close(); sql.close(); // 关闭Session HibernateUtil.closeSession(); if (results != null && results.size() > 0) { return results; } } catch (HibernateException e) { log.fatal(e); } return null; } }