d'abord votre index avec la cartographie parent/child
. Dans le mappage ci-dessous, j'ai également ajouté un champ non-identifié pour categories
afin que vous puissiez exécuter des requêtes de filtre sur ce champ. (Pour créer l'index et les documents, j'utilise l'API JSON et non l'API Java car cela ne faisait pas partie de la question.)
POST /test
{
"mappings": {
"book": {
"_parent": {
"type": "author"
},
"properties":{
"category":{
"type":"string",
"fields":{
"raw":{
"type":"string",
"index": "not_analyzed"
}
}
}
}
}
}
}
Créer des documents author
:
POST /test/author/1
{
"name": "jon doe"
}
POST /test/author/2
{
"name": "jane smith"
}
Créer des documents book
, en précisant la relation entre book
et author
dans la demande.
POST /test/book/12?parent=1
{
"name": "fictional book",
"category": "Fiction",
"publisher": "publisher1"
}
POST /test/book/16?parent=2
{
"name": "book of history",
"category": "historical",
"publisher": "publisher2"
}
POST /test/book/20?parent=2
{
"name": "second fictional book",
"category": "Fiction",
"publisher": "publisher2"
}
La classe Java ci-dessous: 3 requêtes exécute
- Recherche sur tous les
books
qui ont le terme 'livre' dans le titre et le retour authors
.
- Rechercher sur tous
authors
qui ont les termes 'jon doe' dans le nom et renvoient le books
.
- Rechercher
books
écrit par 'jane smith' et qui sont de type Fiction.
Vous pouvez exécuter la classe à partir de la ligne de commande ou l'importer dans Eclipse et cliquer avec le bouton droit de la souris sur la classe, puis sélectionner «Exécuter en tant qu'application Java». (Vous aurez besoin d'avoir la bibliothèque ElasticSearch dans le classpath.)
import java.util.concurrent.ExecutionException;
import org.elasticsearch.action.search.SearchRequestBuilder;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.Client;
import org.elasticsearch.client.transport.TransportClient;
import org.elasticsearch.common.settings.ImmutableSettings;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.transport.InetSocketTransportAddress;
import org.elasticsearch.index.query.FilterBuilders;
import org.elasticsearch.index.query.HasChildQueryBuilder;
import org.elasticsearch.index.query.HasParentQueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.index.query.TermFilterBuilder;
public class ParentChildQueryExample {
public static void main(String args[]) throws InterruptedException, ExecutionException {
//Set the Transport client which is used to communicate with your ES cluster. It is also possible to set this up using the Client Node.
Settings settings = ImmutableSettings.settingsBuilder()
.put("cluster.name", "elasticsearch").build();
Client client = new TransportClient(settings)
.addTransportAddress(new InetSocketTransportAddress(
"localhost",
9300));
//create the searchRequestBuilder object.
SearchRequestBuilder searchRequestBuilder = new SearchRequestBuilder(client).setIndices("test");
//Query 1. Search on all books that have the term 'book' in the title and return the 'authors'.
HasChildQueryBuilder bookNameQuery = QueryBuilders.hasChildQuery("book", QueryBuilders.matchQuery("name", "book"));
System.out.println("Exectuing Query 1");
SearchResponse searchResponse1 = searchRequestBuilder.setQuery(bookNameQuery).execute().actionGet();
System.out.println("There were " + searchResponse1.getHits().getTotalHits() + " results found for Query 1.");
System.out.println(searchResponse1.toString());
System.out.println();
//Query 2. Search on all authors that have the terms 'jon doe' in the name and return the 'books'.
HasParentQueryBuilder authorNameQuery = QueryBuilders.hasParentQuery("author", QueryBuilders.matchQuery("name", "jon doe"));
System.out.println("Exectuing Query 2");
SearchResponse searchResponse2 = searchRequestBuilder.setQuery(authorNameQuery).execute().actionGet();
System.out.println("There were " + searchResponse2.getHits().getTotalHits() + " results found for Query 2.");
System.out.println(searchResponse2.toString());
System.out.println();
//Query 3. Search for books written by 'jane smith' and type Fiction.
TermFilterBuilder termFilter = FilterBuilders.termFilter("category.raw", "Fiction");
HasParentQueryBuilder authorNameQuery2 = QueryBuilders.hasParentQuery("author", QueryBuilders.matchQuery("name", "jane smith"));
SearchResponse searchResponse3 = searchRequestBuilder.setQuery(QueryBuilders.filteredQuery(authorNameQuery2, termFilter)).execute().actionGet();
System.out.println("There were " + searchResponse3.getHits().getTotalHits() + " results found for Query 3.");
System.out.println(searchResponse3.toString());
System.out.println();
}
}
Dans la deuxième requête, si l'auteur avait d'autres types de « enfant », il retournerait ceux aussi. – coolscitist