bookdaoimp.java

图书管理系统 运行环境 windows 2003 windows xp

package com.book.dao;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;

import com.book.domain.Book;
import com.book.util.DBManager;
import com.book.util.Tool;

public class BookDaoImp implements BookDao {

	public Book findByPrimaryKey(String pk) {
		// TODO Auto-generated method stub
		return null;
	}

	public List find(String author, String bookname, String publishing) {
		Map table = DBManager.BookTable;
		List list = new ArrayList();
		Collection tableData = table.values();
		Iterator it = tableData.iterator();
		Set keyset = table.keySet();
		List keys = new ArrayList(keyset);
		Collections.sort(keys);

		it = keys.iterator();
		while (it.hasNext()) {
			String row = (String) table.get(it.next());
			if (row != null) {
				String[] rows = row.split(Tool.COMMA_SIGN_DELIMITERS);
				Book book = new Book(rows[0], rows[1], rows[2], rows[3],
						rows[4], Integer.parseInt(rows[5]));
				if (book.getAuthor() != null
						&& book.getAuthor().indexOf(author) != -1
						&& book.getBookname() != null
						&& book.getBookname().indexOf(bookname) != -1
						&& book.getPublishing() != null
						&& book.getPublishing().indexOf(publishing) != -1) {
					list.add(book);
				}
			}
		}
		return list;
	}

	public void create(Book book) {

		Map table = DBManager.BookTable;

		StringBuffer row = new StringBuffer();
		row.append(book.getBookid());
		row.append(Tool.COMMA_SIGN_DELIMITERS);
		row.append(book.getBookname());
		row.append(Tool.COMMA_SIGN_DELIMITERS);
		row.append(book.getAuthor());
		row.append(Tool.COMMA_SIGN_DELIMITERS);
		row.append(book.getPublishing());
		row.append(Tool.COMMA_SIGN_DELIMITERS);
		row.append(book.getPublishingdate());
		row.append(Tool.COMMA_SIGN_DELIMITERS);
		row.append(book.getStorage());
		table.put(book.getBookid(), row.toString());
	}

	public void delete(String pk) {
		Map table = DBManager.BookTable;
		table.remove(pk);
	}

	public void modify(Book book) {
		
		Map table = DBManager.BookTable;
		StringBuffer row = new StringBuffer();
		row.append(book.getBookid());
		row.append(Tool.COMMA_SIGN_DELIMITERS);
		row.append(book.getBookname());
		row.append(Tool.COMMA_SIGN_DELIMITERS);
		row.append(book.getAuthor());
		row.append(Tool.COMMA_SIGN_DELIMITERS);
		row.append(book.getPublishing());
		row.append(Tool.COMMA_SIGN_DELIMITERS);
		row.append(book.getPublishingdate());
		row.append(Tool.COMMA_SIGN_DELIMITERS);
		row.append(book.getStorage());
		table.put(book.getBookid(), row.toString());

	}

	public List find() {
		// TODO Auto-generated method stub
		return null;
	}

	public String findMaxId() {
		
		Map table = DBManager.BookTable;
		Set keyset = table.keySet();
		String maxid = (String) Collections.max(keyset);		
		return maxid;
	}

}