public void shutdown(){
		// 保证所有链接都处于空闲状态
		while(this.count > this.pool.size()){
			try {
				Thread.currentThread().sleep(200);
			} catch (InterruptedException e) {
				e.printStackTrace();
			}// 睡200毫秒
		}
		
		// 设置销毁标记
		this.isReleasing = true;
		
		// 关闭所有链接
		while(!this.pool.isEmpty()){
			try {
				this.pool.poll().getConn().close();
			} catch (SQLException e) {
				e.printStackTrace();
			}
		}
		
		this.pool.clear();
		this.usedPool.clear();
	}