java - 如何访问Database类实例？

Question

我有一个使用 MongoDB 的 JSP Web 应用程序，它在多个页面上执行不同的操作，例如搜索、更新、删除。那么我可以为所有页​​面创建一个 MongoClient 实例，还是创建一个实例并在必要时调用它们？就效率和速度而言，哪个更有效？

Answer 1

官方文档中http://mongodb.github.io/mongo-java-driver/3.2/driver/getting-started/quick-tour/

据说:

The MongoClient instance actually represents a pool of connections to the database; you will only need one instance of class MongoClient even with multiple threads.

值得注意的是:

Typically you only create one MongoClient instance for a given database cluster and use it across your application. When creating multiple instances:

• All resource usage limits (max connections, etc) apply per MongoClient instance

• To dispose of an instance, make sure you call MongoClient.close() to clean up resources

希望有帮助!