文件名称:
kbmMW v1.02 Commercial for Delphi n BCB incl Source
开发工具:
文件大小: 741kb
下载次数: 0
上传时间: 2006-02-23
详细说明： You may have heard about 2-tier and n-tier applications. What are they exactly? 2-tier - also called client/server - applications are applications which consist of two separate applications, one server application (typically a database server like Oracle, MSSQL or any other standalone database) and a client application. n-tier applications consist of 3 or more active applications which data must pass, from the backend server to the front end client. Usually 3-tier models are used, where one tier is the backend database engine, o ne is the front end client and one is just in between them, also named the application server or business logic node. What is the purpose of having more than 2 tier? Well.. if you want to have many different client frontends, like f.ex. one written in Delphi/BCB as a normal fat client, one as a web server, one as a WAP server, one as a linkup server to a mainframe etc. it would be unwise to copy all the business logic (all the rules of your application) to each client application/server. It would be a nightmare to support. Instead its better to create a middle layer containing the business logic, and then let the clients talk with this middle layer. Thus the clients can relatively easily be changed for other types of clients, without need for remembering how was the business logic put together. Using n-tier models also gives other positive side effects: - Load balancing. They are capable of serving many more clients than a 2-tier solution, simply because the middle node (the application server) can be copied to more than one machine, and thus divide the load between more CPU‘s. - Fault tolerance. If more application servers are running, the clients can simply try the request on another appserver if the first one didnt reply. kbmMW is about all that and much more. It will support different database backends directly without you having to write any code. Thus if you need to perform a SQL query you will do it much the same way you are used to in a normal 2-tier setup. The specialized client and server service classes will handle everything for you. Further kbmMW contains advanced connection pooling on both client to server and server to database, caching of result sets on both client to server and server to database and much more. The database handling with its advanced caching and connectionpooling can aciually be used in 2-tier (Client/Server) setups aswell without using the remaining part of kbmMW giving you freedom in creating your application or web application the way you want to. The source is fully included in the package. ...展开收缩
(系统自动生成,下载前可以参看下载内容)
下载文件列表
相关说明
- 本站资源为会员上传分享交流与学习,如有侵犯您的权益,请联系我们删除.
- 本站是交换下载平台，提供交流渠道，下载内容来自于网络，除下载问题外，其它问题请自行百度。
- 本站已设置防盗链，请勿用迅雷、QQ旋风等多线程下载软件下载资源，下载后用WinRAR最新版进行解压.
- 如果您发现内容无法下载，请稍后再次尝试；或者到消费记录里找到下载记录反馈给我们.
- 下载后发现下载的内容跟说明不相乎，请到消费记录里找到下载记录反馈给我们，经确认后退回积分.
- 如下载前有疑问，可以通过点击"提供者"的名字，查看对方的联系方式，联系对方咨询.
