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v5.0
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    v5.0

      UQL Execution

      This section introduces the uql() and uqlStream() methods to execute UQL in the database.

      UQL (Ultipa Query Language) is the native language designed by Ultipa to fully interact with Ultipa graph databases. For detailed information on UQL, refer to the documentation.

      uql()

      Executes an UQL query in the database.

      Parameters

      • uql: String: The UQL query to be executed.
      • config: RequestConfig (Optional): Request configuration.

      Returns

      • Response: Response of the request.

      // Retrieves 5 movie nodes from the graph 'miniCircle'
      
      RequestConfig requestConfig = new RequestConfig();
      requestConfig.setGraph("miniCircle");
      
      Response response = driver.uql("find().nodes({@movie}) as n return n{*} limit 5", requestConfig);
      List<Node> nodeList = response.alias("n").asNodes();
      for (Node node : nodeList) {
          System.out.println(node.get("name"));
      }
      

      The Shawshank Redemption
      Farewell My Concubine
      Léon: The Professional
      Titanic
      Life is Beautiful
      

      uqlStream()

      Executes an UQL query in the database and returns the results incrementally, allowing handling of large datasets without loading everything into memory at once.

      Parameters

      • uql: String: The UQL query to be executed.
      • cb: QueryResponseListener: Listener for the streaming process.
      • config: RequestConfig (Optional): Request configuration.

      Returns

      • None

      // Retrieves all 1-step paths from the graph 'miniCircle'
      
      RequestConfig requestConfig = new RequestConfig();
      requestConfig.setGraph("miniCircle");
      
      driver.uqlStream("n().e().n() as paths return paths{*}", new QueryResponseListener() {
          int count = 0;
      
          public void onReady() {
          	System.out.println("Start downloading");
          }
      
          public void next(Response response) {
          	if (response.getStatus().getCode() != Ultipa.ErrorCode.SUCCESS){
            	System.out.println(response.getStatus().getMsg());
            }
            List<Path> paths = response.get(0).asPaths();
            count += paths.size();
            System.out.println("count = " + count);
          }
      
          public void onComplete() {
          	System.out.println("Done");
          	System.out.println("count = " + count);
          }
      
          public void onError(Throwable throwable) {
          	System.out.println("Error");
          }
      }, requestConfig);
      

      count = 1024
      count = 2048
      count = 3072
      count = 3220
      count = 3621
      count = 3849
      Done
      count = 3849
      

      Full Example

      package com.ultipa.www.sdk.api;
      
      import com.ultipa.sdk.UltipaDriver;
      import com.ultipa.sdk.connect.conf.RequestConfig;
      import com.ultipa.sdk.connect.conf.UltipaConfig;
      import com.ultipa.sdk.operate.entity.Node;
      import com.ultipa.sdk.operate.response.Response;
      import org.assertj.core.util.Lists;
      
      import java.util.List;
      
      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);
      
                  // Retrieves 5 movie nodes from the graph 'miniCircle'
      
                  RequestConfig requestConfig = new RequestConfig();
                  requestConfig.setGraph("miniCircle");
      
                  Response response = driver.uql("find().nodes({@movie}) as n return n{*} limit 5", requestConfig);
                  List<Node> nodeList = response.alias("n").asNodes();
                  for (Node node : nodeList) {
                      System.out.println(node.get("name"));
                  }
              } catch (InterruptedException e) {
                  throw new RuntimeException(e);
              } finally {
                  if (driver != null) {
                      driver.close();
                  }
              }
          }
      }
      
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