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v5.0
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    v5.0

      Data Export

      This section introduces methods for exporting nodes and edges from graphs.

      export()

      Exports nodes or edges from the graph.

      Parameters

      • exportRequest: ExportRequest: Configurations for the export request, including attributes dbType (defaults to DBNODE), schema, selectProperties and graph.
      • listener: ExportListener: The listener that gets executed when data is exported.
      • config: RequestConfig (Optional): Request configuration.

      Returns

      • None.

      // Exports 'account' nodes in the graph 'miniCircle'
      
      Ultipa.ExportRequest exportRequest = Ultipa.ExportRequest.newBuilder()
      		.setDbType(Ultipa.DBType.DBNODE)
        		.setSchema("account")
        		.setGraph("miniCircle")
        		.addSelectProperties("_id")
        		.addSelectProperties("name")
        		.addSelectProperties("year")
        		.build();
      
      driver.export(exportRequest, new ExportListener() {
          FileWriter csvWriter;
          String schemaName = exportRequest.getSchema();
          String suffix = exportRequest.getDbType() == Ultipa.DBType.DBNODE ? "_node.csv" : "_edge.csv";
          String fileName = schemaName + suffix;
      
          {
              try {
            		csvWriter = new FileWriter(fileName);
            		csvWriter.append("_id,name,year\n"); // header row
              } catch (IOException e) {
            	    throw new RuntimeException("Failed to create CSV file", e);
              }
          }
      
          public void onReady() {
          	System.out.println("Start downloading");
          }
      
          public void onError(Throwable t) {
          	System.out.println("Error occurred while downloading: " + t.getMessage());
          }
      
          public void onComplete() {
          	System.out.println("Download complete");
          	try {
            		if (csvWriter != null) csvWriter.close();
          	} catch (IOException e) {
            		e.printStackTrace();
          	}
        	}
      
          public void next(ExportData result) {
          	List<Node> nodes = result.getNodes();
          	for (Node node : nodes) {
            		try {
              		List<String> values = Arrays.asList(
                		String.valueOf(node.getID()),
                		String.valueOf(node.get("name")),
                		String.valueOf(node.get("year"))
              	).stream().map(val -> "\"" + val + "\"").collect(Collectors.toList()); // wrap values in quotes
      
              	csvWriter.append(String.join(",", values)).append("\n");
      			} catch (IOException e) {
              		System.err.println("Failed to write a row to CSV: " + e.getMessage());
            		}
          	}
          }
      });
      

      Download complete
      

      The file account_nodes.csv is exported to the root directory of your project.

      Full Example

      package com.ultipa.www.sdk.api;
      
      import com.ultipa.Ultipa;
      import com.ultipa.sdk.UltipaDriver;
      import com.ultipa.sdk.connect.conf.UltipaConfig;
      import com.ultipa.sdk.operate.command.listener.ExportListener;
      import com.ultipa.sdk.operate.entity.*;
      import com.ultipa.sdk.operate.response.ExportData;
      import org.assertj.core.util.Lists;
      
      import java.util.Arrays;
      import java.util.List;
      import java.io.FileWriter;
      import java.io.IOException;
      import java.util.stream.Collectors;
      
      public class Main {
          public static void main(String[] args) {
              UltipaConfig ultipaConfig = UltipaConfig.config()
                      // URI example: .hosts(Lists.newArrayList("d3026ac361964633986849ec43b84877s.eu-south-1.cloud.ultipa.com:8443"))
                      .hosts(Lists.newArrayList("192.168.1.85:60061","192.168.1.88:60061","192.168.1.87:60061"))
                      .username("<username>")
                      .password("<password>");
      
              UltipaDriver driver = null;
      
              try {
                  driver = new UltipaDriver(ultipaConfig);
      
                  // Exports 'account' nodes in the graph 'miniCircle'
      
                  Ultipa.ExportRequest exportRequest = Ultipa.ExportRequest.newBuilder()
                          .setDbType(Ultipa.DBType.DBNODE)
                          .setSchema("account")
                          .setGraph("miniCircle")
                          .addSelectProperties("_id")
                          .addSelectProperties("name")
                          .addSelectProperties("year")
                          .build();
      
                  driver.export(exportRequest, new ExportListener() {
                      FileWriter csvWriter;
                      String schemaName = exportRequest.getSchema();
                      String suffix = exportRequest.getDbType() == Ultipa.DBType.DBNODE ? "_node.csv" : "_edge.csv";
                      String fileName = schemaName + suffix;
      
                      {
                          try {
                              csvWriter = new FileWriter(fileName);
                              csvWriter.append("_id,name,year\n"); // header row
                          } catch (IOException e) {
                              throw new RuntimeException("Failed to create CSV file", e);
                          }
                      }
      
                      public void onReady() {
                          System.out.println("Start downloading");
                      }
      
                      public void onError(Throwable t) {
                          System.out.println("Error occurred while downloading: " + t.getMessage());
                      }
      
                      public void onComplete() {
                          System.out.println("Download complete");
                          try {
                              if (csvWriter != null) csvWriter.close();
                          } catch (IOException e) {
                              e.printStackTrace();
                          }
                      }
      
                      public void next(ExportData result) {
                          List<Node> nodes = result.getNodes();
                          for (Node node : nodes) {
                              try {
                                  List<String> values = Arrays.asList(
                                          String.valueOf(node.getID()),
                                          String.valueOf(node.get("name")),
                                          String.valueOf(node.get("year"))
                                  ).stream().map(val -> "\"" + val + "\"").collect(Collectors.toList()); // wrap values in quotes
      
                                  csvWriter.append(String.join(",", values)).append("\n");
                              } catch (IOException e) {
                                  System.err.println("Failed to write a row to CSV: " + e.getMessage());
                              }
                          }
                      }
                  });
              } catch (InterruptedException e) {
                  throw new RuntimeException(e);
              } finally {
                  if (driver != null) {
                      driver.close();
                  }
              }
          }
      }
      
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