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Welcome to LeeHao homepage, A Database workshop | leehao.org Reviews
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Welcome to LeeHao homepage
http://www.leehao.org/friends/friends.html
My friend homepages list. 1: Zhao Wei, David. 2: Liu Ming Lei, Pig. On Jun 22, 2013. C) 2013 leehao.org. Design by LeeHao.org.
Articles On Database Internal.
http://www.leehao.org/essays/essayslists.html
0 : A novel query language of Key-Value NoSQL. In this article, we incoporate a novel query language which is used to retrieve data via this new query language on key-value NoSQL, such as MongoDB. Recently, NoSQL has drawn more attention on it, espcially in internet corporations. See More: [Read More.]. 1: Transfering between SQL and XQuery. 2: How to get a new query engine. 3: How to use the indices. In this article, I will present the ways of using indices in XMLDB. Considering the existed codes, t...
How PostgreSQL knows what I want to do? Transform the Raw Syntax Tree.
http://www.leehao.org/relDB/QueryEngineTransformerCh.htm
How Pg knows what I want to do? Before we discussion, you must know some basic knowledge about lexical and grammatical knowledge, which can give you some basic description of that. Taking "select * from my first table where id=2;" as an instance to illustrate how the PostgreSQL do transform. 从gramm.y 中可以看出 selectstmt 中的targlist参数的 执行操作:. Target el: a expr AS ColLabel. Name = $3;. Indirection = NIL;. Val = (Node *)$1;. Location = @1;. 如果是select * xxx 此类形式，则$ - val 为 ColumnRef node对象。 N- location = @1;.
Introduction To Query Engine
http://www.leehao.org/xmlDB/QueryEngine.htm
How the query engine works? 0: In this document, we will explain how the xquery query engine works. All the explanations are based on XQParse.y. The query Statement: "query doc("test.xdb/test.xml")/bookstore/book/title[@lang='en'];". First of all, the manager (XmlManager) invokes the queryexpress to do query, including, prepares the query statement, and executes the query statement. Optimizer* optimizer =0;. Optimizer = new AccessControlChecker (context, optimizer);. Optimizer = new QueryPlanOptimizer (O...
Insight the PostgreSQL Query Engine.
http://www.leehao.org/essays/fulltext.htm
例如 对于查询语句 query doc( document )/a/b/c[@attr ftcontains keywords ]的查询语句。 按w3c标准给出的定义 首先查询出文档document中路径为/a/b/c的节点，然后将这些节点的attr属性值送入全文检索处理模块 检查该属性值中是否包含所指定的查询关键字，当属性的值为 this is a keywords in attribute。 Matcher的主要作用是将送入来的Token与全文检索的条件进行适配，用以判断所送入的tokens是否满足全文检索的条件，当tokens满足相应的条件后，则将本次匹配的结果 True or False 返回给上层处理模块 全文检索查询树的父节点。 为了能够满足系统对于全文检索效率的要求，同时考虑到系统开发效率以及难道，我们使用上述的第二种方案 与关系数据库加全文检索系统 Lucene /Sphinx 相似我们也采用相似的架构来实现准实时高效的的全文检索。 如 数据加载过程中 数据更新时候等，这些导致数据变更的场景下，均需要考虑基表数据与索引数据之间的一致性 或者容忍一定程度的数据不一致。 理论上，Lucene...
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Leehany
leehany | Fansfic Friends
I’m With You. Title : I’m With You. Genre : Romance, friendship, comedy. Length : one shot. NEXT STORY Selamat membaca. Seorang yeoja keluar dari rumahnya, dia masih menggunakan piama pink, rambut masih acak-acakan karena disebabkan baru bangun tidur. Yeoja itu berlari ke rumah yang tepat berada disebelah. Teriak yeoja itu bermaksud membangunkan namja yang diteriaki. Taeminnie! Ada apa lagi Airi? Gwaenchanna, hari ini taemin ngapain kamu lagi, sampai teriak-teriak gitu? Tanya leejoon sambil tersenyum ram...
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Lee, Hannah, Zach and Jake
Lee, Hannah, Zach and Jake. Monday, July 18, 2011. After much consideration I've decided to shut down this blog! Thanks for the love, support, and comments over the years. I hope this finds you happy and well! Subscribe to: Posts (Atom). View my complete profile. Awesome Inc. template. Powered by Blogger.
Welcome to LeeHao homepage, A Database workshop
Database internal- here, we intend to anatomy a database to show how it stores data, retrieves data back as well as how to get database as quick as possible, and how to manipulate data in concurrently enviroment. therefore, it involves several parts: server framework, query engine, execution engine, storage engine. we chose postgreSQL. As an example to explain all things above. Read more. This is designed for a search engine study. A modified Larbin. On Aug. 11 17:21pm, 2013. The Fulltext In XMLDB. C) 20...
GalleyLa Express Times !
Monday, 12 January 2015. I have been lazy to write this post, partially is because of the lack of quantity in the books I read. 2014 was not a very productive year indeed, much of my time had been used on working and internet surfing, plus my indulgence in Muay Thai training did occupy a lot of my time. The thickest shit I have ever read. To be honest, I was only able to comprehend around 65 80% of the content due to inadequate vocabulary reserved in my vocab arsenal lol. It was worthwhile indeed. This i...
这美丽的世界
黄昏，不会是终点，破晓时分，希望的光芒依旧照亮这美丽的世界. 然，在我心坎里，你们，. 算算之前比过的歌。。。 到今年的祭神。。。 每首歌带给我不同的回忆。。。 从之前的＂你们没可能奏到的＂，. 65282;没练完不准休息！＂. 明明二胡协奏很好听的。。。 其它回忆则是那么琐碎，揍不起来耶。。。 拿金拿到麻了，拼劲自然减少。。。 默契呢？不知还剩多少。。。 我真的很讨厌你。什么烂歌！！！ 好好珍惜这次的旅程！！！ 忆。传奇（二）照片在说话. 享用早餐。。。 这是把世博园区＂一分为二＂的黄蒲江。 好高科技的视觉效果，不止如此，背景音乐也很不错。 这是谁？假人来的！！！ 以上几个国家馆我们都没进去参观，唉！人龙太长了！ 我们没得进去参观的中国馆！！！ 咦，这个米南加保式建筑是什么东东来的？哦，马来西亚馆！ 坦白说，见了这些，除了惊奇，没有其它感觉。 这就是我们在上海的栖身之所，床很乱！哈哈！ 我们可真算是＂先苦后甜＂，接下来几间酒店房间大得不得了。 照片提供：其铮，家铭家铫，松翰，程异，为康. 真的很感人，我要哭了。。。 我们就进了＂加勒比共同体联合馆＂。 天堂！！！ 只是琵琶的＂飞镖A...
。。篮色星語。。 | 藍色的天空,無論在什么地方,星星都会伴隨著您。。。
August 14, 2015. 如果一个人从美丽一下子变得很醜，结果会是怎样 ，愛你的人还会接受你吗 今你可以接受她嗎 好好的思考才再回答。 然而这真实的故事告诉了我们，真的爱了一切都不再是问题，容颜勝不了一颗真正爱你的心，….祝福他和她,变了容颜,卻变不了心………. August 13, 2015. July 3, 2015. July 1, 2015. June 11, 2015. June 8, 2015. May 26, 2015. Blog at WordPress.com. Singapore's Top Beauty and Travel Blogger. Blog at WordPress.com. Get every new post delivered to your Inbox. Join 164 other followers. Build a website with WordPress.com. Add your thoughts here. (optional).
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