lendbookservice.java

Eclips3.2 + mysql5.5 用Struts2编写的图书管理系统

package com.service;

import java.util.Date;

import com.dao.BookDAO;
import com.dao.LendDAO;
/**
 * 
 * 借书业务类
 *
 */
public class LendBookService {
	public static boolean lend(int userid,int bookid,Date engagetime){
		BookDAO bookDAO = new BookDAO();
		LendDAO lendDAO = new LendDAO();
		//检查书籍是否可借
		if (bookDAO.checkBook(bookid)) {
			//执行借书操作
			try {
				lendDAO.lengBook(userid, bookid, engagetime);
				//书籍被借后,数量-1
				bookDAO.numLessen(bookid);
				//书籍被借阅数+1
				bookDAO.addAmount(bookid);
				//检查书籍下次是否可借
				bookDAO.bookStat(bookid);
			} catch (RuntimeException e) {
				// TODO Auto-generated catch block
				return false;
			}
			return true;
		}
		return false;
		
	}
}