Database Change Notification

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Database Change Notification

使用java监控oracle数据库的变化,主要是针对表数据,如果发生变化,使用select去查询,能够达到推送的目的 package com.test.notifi; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; import java.util.Properties; import oracle.jdbc.OracleConnection; import oracle.jd…

PIC32MZ tutorial -- Change Notification

In my last post I implement "Key Debounce" with port polling, port polling is not very efficient. And this time, I will use change notification instead of port polling. It generates interrupt and starts debounce when the level of digital port ch…

Up-to-date cache with EclipseLink and Oracle

Up-to-date cache with EclipseLink and Oracle One of the most useful feature provided by ORM libraries is a second-level cache, usually called L2. L2 object cache reduces database access for entities and their relationships. It is enabled by default i…

MongoDB Change Stream：简介、尝试与应用

在MongoDB3.6引入的新feature中,change stream无疑是非常吸引人的. Change streams allow applications to access real-time data changes without the complexity and risk of tailing the oplog. Change stream允许应用实时获取mongodb数据的变更,这是个呼声很高的一个的需求,可以用于ETL.跨平台数据同步.通知服务等.以前没有change…

iOS开发——OC篇&消息传递机制（KVO／NOtification／Block／代理／Target－Action）

iOS开发中消息传递机制(KVO/NOtification/Block/代理/Target-Action) 今晚看到了一篇好的文章,所以就搬过来了,方便自己以后学习虽然这一期的主题是关于Foundation Framework的,不过本文中还介绍了一些超出Foundation Framework(KVO和Notification)范围的一些消息传递机制,另外还介绍了delegation,block和target- action. 大多数情况下,消息传递该使用什么机制,是很明确的了,当…

Database(Mysql)发版控制二

author:skate time:2014/08/18 Database(Mysql)发版控制 The Liquibase Tool related Database 一.Installation & Configration 二.Advanced Usage of the Liquibase 三.Frequently Questions 二.Advanced Usage of the Liquibase 1.实际场景模拟实际需求:须要把不同环境的不同分支的数据库变更合并,并按需求应用或回滚…

Obtaining Directory Change Notifications（微软的例子，使用FindFirstChangeNotification，FindNextChangeNotification，FindCloseChangeNotification API函数）

An application can monitor the contents of a directory and its subdirectories by using change notifications. Waiting for a change notification is similar to having a read operation pending against a directory and, if necessary, its subdirectories. Wh…