coursemanager.java

来自「功能还没做全的选课系统」· Java 代码 · 共 80 行

package com.xuanke.student.control;

import java.util.List;

import com.xuanke.student.model.CoursetBean;
import com.xuanke.student.model.CourseDAO;
import com.xuanke.utils.DBConnectionManager;
import com.xuanke.utils.MyJDBCException;

public class CourseManager {
	private static CourseManager instance=null;
	private CourseDAO dao=null;
	/*
	 * 下列代码的基本意图是，保证StudentManager类仅有一个实例对象
	 * 有利于进行内存控制
	 * 还有利于继承StudentManager类，并在getInstance方法中返回其子类
	 * 如有如下类：
	 * public class NewStudentManager extends StudentManager{
	 *     ......
	 * }
	 * 如果希望StudentManager的getInstance方法返回NewStudentManager的实例
	 * 则只需要把getInstance方法修改为
	 * public static StudentManager getInstance(){
		if(instance==null)
			instance=new NewStudentManager();
		return instance;
	}
	 */
	private CourseManager(){	
		
	}
	public static CourseManager getInstance(){
		if(instance==null)
			instance=new CourseManager();
		return instance;
	}
	public List findAll() throws BusinessException{
		// TODO 自动生成方法存根
		try {
			dao=new CourseDAO(DBConnectionManager.getConnection());
			return dao.findAll();
		} catch (MyJDBCException e) {
			throw new BusinessException(e.getMessage());
		}
		
	}
	public List findPersonalAll() throws BusinessException{
		// TODO 自动生成方法存根
		try {
			dao=new CourseDAO(DBConnectionManager.getConnection());
			return dao.findPersonalAll();
		} catch (MyJDBCException e) {
			throw new BusinessException(e.getMessage());
		}
		
	}
	public void delete(String id) throws BusinessException{
		// TODO 自动生成方法存根
		try {
			dao=new CourseDAO(DBConnectionManager.getConnection());
			dao.delete(id);
		} catch (MyJDBCException e) {
			throw new BusinessException(e.getMessage());
		}
		
	}
	public void add(String id) throws BusinessException{
		try {
			dao=new CourseDAO(DBConnectionManager.getConnection());
			dao.add(id);
		} catch (MyJDBCException e) {
			throw new BusinessException(e.getMessage());
		}
		
	}
	

}