ehcache使用举类

ehcache使用举类

以SQL文为Key进行缓存

	public static SelectDaoResult execute(DataSource ds, SelectDao selectDao,
			Object bindValues, ResultSetExtractor extractor, Class clazz) {
		if (extractor == null) {
			extractor = new BasicResultSetExtractor(selectDao.getResultTypes(),
					clazz);
		}

		SqlInfo sqlInfo = assembleSql(selectDao, bindValues);

		String cacheKey = selectDao.getClass().getName();
		CacheManager cacheManager;
		try {
			cacheManager = CacheManager.getInstance();
		} catch (Exception e) {
			return select(ds, extractor, sqlInfo, cacheKey);
		}

		Cache cache = cacheManager.getCache(cacheKey);
		if (cache == null) {
			return select(ds, extractor, sqlInfo, cacheKey);
		}

		String key = JdbcLogHelper.replace(sqlInfo.getSql(),
				sqlInfo.getBindValues());
		Element element = null;
		try {
			element = cache.get(key);
		} catch (Exception e) {
		}
		if (element != null) {
			return ((SelectDaoResult) element.getValue());
		}

		SelectDaoResult result = select(ds, extractor, sqlInfo, cacheKey);
		cache.put(new Element(key, result));
		return result;
	}