友情提示：图数据库 OrientDB 安装 及 初步使用

额外的Jar包

• OrientDB JDBC 驱动

https://orientdb.com/download-2/，单击此链接，如下图所示

下载矩形方框中的驱动。

• spark-orientdb

https://dl.bintray.com/sbcd90/org.apache.spark/org/apache/spark/，点击此链接，下载特定版本的Jar包。参考链接

• graphframes

至于，如何在 IDEA 中搭建 Spark 开发环境，我觉得就没必要废话了。下面老规矩，直接上代码。

Spark DataFrame 写入 OrientDB

    val spark = SparkSession.builder().appName("SparkOrientDB").getOrCreate()
    import spark.implicits._
    import spark.sql

    // Vertex DataFrame
    spark.createDataFrame(List(
      ("a", "Alice", 34),
      ("b", "Bob", 36),
      ("c", "Charlie", 30),
      ("d", "David", 29),
      ("e", "Esther", 32),
      ("f", "Fanny", 36),
      ("g", "Gabby", 60)
    )).toDF("id", "name", "age")
      .write.format("org.apache.spark.orientdb.graphs")
      .option("dburl", "remote:localhost/graphdb")
      .option("user", "root")
      .option("password", "root")
      .option("vertextype", "Vgraphx")
      .mode("overwrite")
      .save()

    // Edge DataFrame
    spark.createDataFrame(List(
      ("a", "b", "friend"),
      ("b", "c", "follow"),
      ("c", "b", "follow"),
      ("f", "c", "follow"),
      ("e", "f", "follow"),
      ("e", "d", "friend"),
      ("d", "a", "friend"),
      ("a", "e", "friend")
    )).toDF("src", "dst", "relationship")
      .write.format("org.apache.spark.orientdb.graphs")
      .option("dburl", "remote:localhost/graphdb")
      .option("user", "root")
      .option("password", "root")
      .option("vertextype", "Vgraphx")
      .option("edgetype", "Egraphx")
      .mode("overwrite")
      .save()

单击 http://localhost:2480，查询 写入的顶点和边。如下图所示，

Spark 读取 OrientDB 返回 DataFrame

    val vertices = spark.read
      .format("org.apache.spark.orientdb.graphs")
      .option("dburl", "remote:localhost/graphdb")
      .option("user", "root")
      .option("password", "root")
      .option("vertextype", "Vgraphx")
      .load()

    val edges = spark.read
      .format("org.apache.spark.orientdb.graphs")
      .option("dburl", "remote:localhost/graphdb")
      .option("user", "root")
      .option("password", "root")
      .option("edgetype", "Egraphx")
      .load()

    val g = GraphFrame(vertices, edges)

顶点输出如下，

g.vertices.show(false)

+-------+---+---+
|name   |id |age|
+-------+---+---+
|Bob    |b  |36 |
|David  |d  |29 |
|Charlie|c  |30 |
|Esther |e  |32 |
|Fanny  |f  |36 |
|Gabby  |g  |60 |
|Alice  |a  |34 |
+-------+---+---+

边的输出如下，

g.edges.show(false)

+---+------------+---+
|dst|relationship|src|
+---+------------+---+
|c  |follow      |b  |
|b  |follow      |c  |
|f  |follow      |e  |
|a  |friend      |d  |
|c  |follow      |f  |
|d  |friend      |e  |
|b  |friend      |a  |
|e  |friend      |a  |
+---+------------+---+

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