继承自上一篇：

查询全部的方法，代码如下：

public List<Account> queryAll() {

		sqliteDatabase db = helper.getReadableDatabase();

		Cursor c = db.rawQuery("SELECT * FROM account",null);// 查询表中所有的数据
		List<Account> list = new ArrayList<Account>();

		while (c.moveToNext()) {

			int id = c.getInt(c.getColumnIndex("_id"));

			String name = c.getString(c.getColumnIndex("name"));

			int balance = c.getInt(c.getColumnIndex("balance"));

			list.add(new Account(id,name,balance));

		}
		c.close();
		db.close();

		return list;
	}

	public void testQueryAll(){
		AccountDao dao = new AccountDao(getContext());
		List<Account> list = dao.queryAll();
		for (Account account : list) {
			System.out.println(account);
		}
	}

String name = c.getString(0);// 从结果集中获取数据，直接拿的索引，这个索引 是0，因为在这个语句中："SELECT name,balance FROM account WHERE _id=?" name的索引为0
int balance = c.getInt(c.getColumnIndex("balance"));// 从结果集中获取数据(先根据列名获取索引,再根据索引获取数据)