app engine摘录一

最新推荐文章于 2025-08-04 23:14:52 发布

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最新推荐文章于 2025-08-04 23:14:52 发布

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文章标签：数据库

原文链接：http://www.cnblogs.com/perfectdesign/archive/2008/06/29/1232065.html

在可扩展的Web应用中，数据存储与访问是复杂的问题。用户可能与多个服务器交互，而请求可能被路由到不同的服务器。AppEngine通过其基础设施简化了这一过程，提供了数据分布、复制和负载均衡的解决方案，并附带强大的查询引擎和事务处理能力。由于其数据存储不是传统的关系型数据库，查询不使用SQL，而是采用类似SQL的GQL语言。

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Storing data in a scalable web application can be tricky. A user could be interacting with any of dozens of web servers at a given time, and the user's next request could go to a different web server than the one that handled the previous request. All web servers need to be interacting with data that is also spread out across dozens of machines, possibly in different locations around the world.

Thanks to Google App Engine, you don't have to worry about any of that. App Engine's infrastructure takes care of all of the distribution, replication and load balancing of data behind a simple API—and you get a powerful query engine and transactions as well.

The App Engine datastore has a sophisticated query engine for data models. Because the App Engine datastore is not a traditional relational database, queries are not specified using SQL. Instead, you can prepare queries using a SQL-like query language we call GQL. GQL provides access to the App Engine datastore query engine's features using a familiar syntax.

转载于:https://www.cnblogs.com/perfectdesign/archive/2008/06/29/1232065.html