mongodb Java如何从MongoDatabase类中获取DB对象作为MongoClient。getDB（dbName）已被弃用

Question

以下是旧代码：

String uri = "mongodb://" + dbUser + ":" + dbPass + "@" + servers + "/"+dbName+ "?ssl=true&authSource=admin&connectTimeoutMS=6000&socketTimeoutMS=6000";  
MongoClientURI uriObj = new MongoClientURI(uri);            
MongoClient client = new MongoClient(uriObj);

DB db = client.getDB(dbName);  ==> deprecated  

自从MongoClient。getDB（dbName）已被弃用，以下是新代码：

String uri = "mongodb://" + dbUser + ":" + dbPass + "@" + servers + "/"+dbName+ "?ssl=true&authSource=admin&connectTimeoutMS=6000&socketTimeoutMS=6000";  
MongoClientURI uriObj = new MongoClientURI(uri);            
MongoClient client = new MongoClient(uriObj);

MongoDatabase database = client.getDatabase(dbName);  ==> How to get DB db?

如何从新代码中获取DB对象（在旧代码中为DB DB）

Answer 1

您的代码DB db = mongoClient.getDB(dbName);正是针对mongodb java驱动程序版本，如2.14.2和2.13.3。下面是更新的，因为3.0.4和3.7.1

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如文件中所述：

Use MongoClients.create(), or MongoClient() for the legacy MongoClient API, to make a connection to a running MongoDB instance.

up to version 3.7（遗留MongoClient API），您可以使用连接字符串和getDatabase()方法to access a database如下：

MongoClient mongoClient = new MongoClient(new MongoClientURI("mongodb://user1:pwd1@host1/?authSource=db1&ssl=true"));
MongoDatabase database = mongoClient.getDatabase("db_name");

或者按照同样的逻辑：

MongoClientURI uri = new MongoClientURI("mongodb://user1:pwd1@host1/?authSource=db1&ssl=true");
MongoClient mongoClient = new MongoClient(uri);
MongoDatabase database = mongoClient.getDatabase("db_name");

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New MongoClient API（since 3.7）

To make a connection对于正在运行的MongoDB实例和to access a database，您可以使用：

MongoClient mongoClient = MongoClients.create("mongodb://user1:pwd1@host1/?authSource=db1&ssl=true");
MongoDatabase database = mongoClient.getDatabase("db_name");

Specify the name of the database to the getDatabase() method. If a database does not exist, MongoDB creates the database when you first store data for that database.