mongo-scala某字段有則更新無則插入

問題：
SparkStreaming處理實時數據將統計結果寫入mongo，用mongo-java的api需要做一層判斷即對某個維度進行查找如果存在則把指標更新，如果不存在則插入維度與指標字段，這種方式耗時效率低下
換用mongo-scala的api使用其upsert方式實現插入與跟新，需要query的字段需在mongo中建立索引

/**
   * Performs an update operation.
   * @param q search query for old object to update
   * @param o object with which to update `q`
   */
  def update[A, B](q: A, o: B, upsert: Boolean = false, multi: Boolean = false,
                   concern:                  com.mongodb.WriteConcern = this.writeConcern,
                   bypassDocumentValidation: Option[Boolean]          = None)(implicit queryView: A => DBObject, objView: B => DBObject,
                                                                              encoder: DBEncoder = customEncoderFactory.map(_.create).orNull): WriteResult = {
    bypassDocumentValidation match {
      case None                   => underlying.update(queryView(q), objView(o), upsert, multi, concern, encoder)
      case Some(bypassValidation) => underlying.update(queryView(q), objView(o), upsert, multi, concern, bypassValidation, encoder)
    }
  }

添加依賴：

    <dependency>
            <groupId>org.mongodb</groupId>
            <artifactId>casbah_2.11</artifactId>
            <version>3.1.1</version>
            <type>pom</type>
        </dependency>
        
         <dependency>
            <groupId>org.mongodb.spark</groupId>
            <artifactId>mongo-spark-connector_2.11</artifactId>
            <version>${spark.version}</version>
        </dependency>
        

注：pom中和需要去掉java-mongo-driver的依賴，否則衝突