官网文本档地址
http://mongodb.github.io/mongo-scala-driver/2.5/getting-started/quick-tour/
在API中，返回a的所有方法Observables都是“冷”流，这意味着在订阅之前不会发生任何事情。
以下示例不执行任何操作：
val observable: Observable[Completed] = collection.insertOne(doc)
只有当Observable订阅并且请求的数据才会发生操作：
// Explictly subscribe:
observable.subscribe(new Observer[Completed] {
override def onNext(result: Completed): Unit = println("Inserted")
override def onError(e: Throwable): Unit = println("Failed")
override def onComplete(): Unit = println("Completed")
})
插入文档后，onNext将调用该方法并打印“已插入！”，
然后onCompleted打印“已完成”的方法。如果由于任何原因出现错误，该onError 方法将打印“失败”。
mongo-scala-drive的使用demo
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2019-01-28
15:49:52
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mongo-scala-drive的使用demo （196个子文件） 
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