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;
	/*
	 * 下列代碼的基本意圖是，保證StudentManager類僅有一個實例對象
	 * 有利于進行內存控制
	 * 還有利于繼承StudentManager類，并在getInstance方法中返回其子類
	 * 如有如下類：
	 * public class NewStudentManager extends StudentManager{
	 *     ......
	 * }
	 * 如果希望StudentManager的getInstance方法返回NewStudentManager的實例
	 * 則只需要把getInstance方法修改為
	 * 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 自動生成方法存根
		try {
			dao=new CourseDAO(DBConnectionManager.getConnection());
			return dao.findAll();
		} catch (MyJDBCException e) {
			throw new BusinessException(e.getMessage());
		}
		
	}
	public List findPersonalAll() throws BusinessException{
		// TODO 自動生成方法存根
		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 自動生成方法存根
		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());
		}
		
	}
	

}