UQL Execution

This section introduces the uql() and uqlStream() methods on a Connection object for querying the database using UQL.

Each example focuses solely on the method's usage. For a complete code example, please refer to the full example.

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

Uql()

Executes a UQL query on the current graphset or the database and returns the result.

Parameters:

• string: The UQL query to be executed.
• RequestConfig (Optional): Configuration settings for the request. If nil is provided, the function will use default configuration settings.

Returns:

• Response: Result of the request.
• error: An error object containing details about any issues that occurred. nil is returned if the operation is successful.

// Retrieves 5 @movie nodes in graphset 'miniCircle' and prints their information

requestConfig := &configuration.RequestConfig{
  UseMaster: true,
  GraphName: "miniCircle",
}

query, _ := conn.Uql("find().nodes({@movie}) as n return n{*} limit 5", requestConfig)
nodeList, schemaList, _ := query.Alias("n").AsNodes()
printers.PrintNodes(nodeList, schemaList)

+-----+------+--------+--------------------------+------------------------+------+--------+
| ID  | UUID | Schema |           name           |         genre          | year | rating |
+-----+------+--------+--------------------------+------------------------+------+--------+
| m_1 | 1001 | movie  | The Shawshank Redemption |      crime drama       | 1994 |  9.7   |
| m_2 | 1002 | movie  |  Farewell My Concubine   |   drama romance LGBT   | 1993 |  9.6   |
| m_3 | 1003 | movie  |       Forrest Gump       |     drama romance      | 1994 |  9.5   |
| m_4 | 1004 | movie  |          Léon           |   drama action crime   | 1994 |  9.4   |
| m_5 | 1005 | movie  |         Titanic          | drama romance disaster | 1997 |  9.4   |
+-----+------+--------+--------------------------+------------------------+------+--------+

For more examples, please refer to Types Mapping Ultipa and Go.

UQLStream()

Executes a UQL query on the current graphset or the database and returns the result incrementally, allowing handling of large datasets without loading everything into memory at once.

Parameters:

• string: The UQL query to be executed.
• RequestConfig (Optional): Configuration settings for the request. If nil is provided, the function will use default configuration settings.

Returns:

• UQLResponseStream: Result of the request.
• error: An error object containing details about any issues that occurred. nil is returned if the operation is successful.

// Retrieves all 1-step paths in graphset 'miniCircle'

requestConfig := &configuration.RequestConfig{
  UseMaster: true,
  GraphName: "miniCircle",
}

stream, err := conn.UQLStream("n().e().n() as paths return paths{*}", requestConfig)

if err != nil {
  println(err)
}

count := 0

for true {
  resp, err := stream.Recv(true)
  if err != nil {
    println("End")
  }
  if resp != nil {
    printers.PrintStatistics(resp.Statistic)
    paths, err := resp.Get(0).AsPaths()
    if err != nil {
      println(err)
    }
    count += len(paths)
    println("Count = ", count)
  } else {
    break
  }
}
stream.Close()

Total Cost : 0.029s | Engine Cost : 0.001s 
Count =  1250
Total Cost : 0.029s | Engine Cost : 0.001s 
Count =  1390
End

Full Example

package main

import (
  "github.com/ultipa/ultipa-go-sdk/sdk"
  "github.com/ultipa/ultipa-go-sdk/sdk/configuration"
  "github.com/ultipa/ultipa-go-sdk/utils"
)

func main() {

  // Connection configurations
  //URI example: hosts="mqj4zouys.us-east-1.cloud.ultipa.com:60010"
  config, _ := configuration.NewUltipaConfig(&configuration.UltipaConfig{
    Hosts:    []string{"192.168.1.85:60061", "192.168.1.86:60061", "192.168.1.87:60061"},
    Username: "***",
    Password: "***",
  })

  // Establishes connection to the database
  conn, _ := sdk.NewUltipa(config)

  // Request configurations
  requestConfig := &configuration.RequestConfig{
    UseMaster: true,
    GraphName: "miniCircle",
  }

  // Retrieves 10 nodes and prints the _id and name property value of the first returned one
  query, _ := conn.Uql("find().nodes({@movie}) as n return n{*} limit 10", requestConfig)
  nodeList, _, _ := query.Alias("n").AsNodes()
  println(utils.JSONString(nodeList[0].GetID()))
  println(utils.JSONString(nodeList[0].Values.Get("name")))  
}