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v5.0
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    v5.0

      Result Processing

      The output of the driver depends on the specific request made. Some methods, like uql(), return a Response object, which requires you to extract the data and cast it into the corresponding driver type to serve the Java application. Other methods, like showGraph(), showSchema(), and showProperty(), return data of the driver type (GraphSet, Schema, Property, etc.) directly. Please read Types Mapping Ultipa and Java for a list of the core driver types.

      Response

      The uql() and some other methods return a Response object. Response has the following fields:

      Field
      Type
      Description
      aliases List<Alias> List of aliases; each has name and type of the data.
      items Map<String, DataItem> Map of aliases and their corresponding data (DataItem).
      insertNodesReply Ultipa.InsertNodesReply Result of batch node insertions.
      insertEdgesReply Ultipa.InsertEdgesReply Result of batch edge insertions.
      exportData ExportData Result of data export operations.
      explainPlan ExplainPlan Explanation tree for the UQL statement.
      status Status Execution status of the request.
      statistic Statistic Statistics of the request execution, including nodeAffected, edgeAffected, totalCost, engineCost, etc.

      If the query returns data, you can extract each item by its alias using the get() or alias() method. Both methods return a DataItem object, which embeds the query result. To map the DataItem to the corresponding driver type, please read Types Mapping Ultipa and Java.

      get()

      Retrieves data by the alias index.

      Parameters:

      • Integer: Index of the alias.

      Returns:

      • DataItem: The retrieved data.

      Response response = client.uql("find().nodes() as n return n._id, n._uuid limit 3");
      System.out.println(response.get(0).toJson());
      

      The UQL statement returns two aliases n._id and n._uuid; the get() method retrieves the alias n._id at index 0.

      ["{\"type\":\"STRING\",\"values\":[\"u604131\",\"u604510\",\"u604614\"],\"name\":\"n._id\"}"]
      

      alias()

      Retrieves data by the alias name.

      Parameters:

      • String: Name of the alias.

      Returns:

      • DataItem: The retrieved data.

      Response response = client.uql("find().nodes() as n return n._id, n._uuid limit 3");
      System.out.println(response.alias("n._uuid").toJson());
      

      The UQL statement returns two aliases n._id and n._uuid; the alias() method retrieves the alias n._uuid by its name.

      ["{\"type\":\"UINT64\",\"values\":[\"1\",\"2\",\"3\"],\"name\":\"n._uuid\"}"]
      
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