Java: ArangoDB: Execute APL queries

ArangoDatabase provides 'query' method to execute APL queries.

 

Signature

<T> ArangoCursor<T> query(String query, Map<String, Object> bindVars, AqlQueryOptions options, Class<T> type) throws ArangoDBException;

<T> ArangoCursor<T> query(String query, AqlQueryOptions options, Class<T> type) throws ArangoDBException;

<T> ArangoCursor<T> query(String query, Map<String, Object> bindVars, Class<T> type) throws ArangoDBException;

<T> ArangoCursor<T> query(String query, Class<T> type) throws ArangoDBException;

 

'query' specifies the AQL query to execute.

'bindVars' is a map used to bing query variables to values.

'AqlQueryOptions' is used to provide additional query options like count, cache, batchSize, memoryLimit etc.,

'type' specifies the type of the result.

 

Example

String query = "FOR c IN " + collectionName + " FILTER c.firstName == @fName RETURN c";
Map<String, Object> bindVars = Collections.singletonMap("fName", "Krishna");

ArangoCursor<BaseDocument> cusor = arangoDatabase.query(query, bindVars, null, BaseDocument.class);

 

Find the below working application.

 

APLQueryDemo.java

 

package com.sample.app;

import java.util.Arrays;
import java.util.Collections;
import java.util.Map;

import com.arangodb.ArangoCollection;
import com.arangodb.ArangoCursor;
import com.arangodb.ArangoDB;
import com.arangodb.ArangoDatabase;
import com.arangodb.entity.BaseDocument;
import com.arangodb.mapping.ArangoJack;

public class APLQueryDemo {
	private static final String USER_NAME = "root";
	private static final String PASSWORD = "tiger";
	private static final String HOST = "127.0.0.1";
	private static final int PORT = 8529;

	public static void main(String args[]) {
		// Get an ArangoDB instance
		ArangoDB arangoDB = new ArangoDB.Builder().user(USER_NAME).password(PASSWORD).host(HOST, PORT)
				.serializer(new ArangoJack()).build();

		String databaseName = "testdb";
		arangoDB.createDatabase(databaseName);

		ArangoDatabase arangoDatabase = arangoDB.db(databaseName);

		String collectionName = "test1";

		arangoDatabase.createCollection(collectionName);

		ArangoCollection collection = arangoDatabase.collection(collectionName);

		BaseDocument empDocument1 = new BaseDocument();
		empDocument1.addAttribute("firstName", "Krishna");
		empDocument1.addAttribute("lastName", "Gurram");
		empDocument1.addAttribute("hobbies", Arrays.asList("trekking", "playing cricket"));

		BaseDocument empDocument2 = new BaseDocument();
		empDocument2.addAttribute("firstName", "Joel");
		empDocument2.addAttribute("lastName", "Chelli");
		empDocument2.addAttribute("hobbies", Arrays.asList("designing games"));

		collection.insertDocuments(Arrays.asList(empDocument1, empDocument2));

		String query = "FOR c IN " + collectionName + " FILTER c.firstName == @fName RETURN c";
		Map<String, Object> bindVars = Collections.singletonMap("fName", "Krishna");

		ArangoCursor<BaseDocument> cusor = arangoDatabase.query(query, bindVars, null, BaseDocument.class);

		System.out.println("All the documents with firstName 'Krishna'\n");
		while (cusor.hasNext()) {
			BaseDocument baseDoc = cusor.next();
			System.out.println(baseDoc);
		}

		// Dropping the collection and database
		collection.drop();
		arangoDatabase.drop();
		System.exit(0);
	}
}

 

Output

All the documents with firstName 'Krishna'

BaseDocument [documentRevision=_cS50BWW---, documentHandle=test1/63796, documentKey=63796, properties={firstName=Krishna, lastName=Gurram, hobbies=[trekking, playing cricket]}]

 

  

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