Article code (#13567)
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package com.baeldung.mongo.insert;
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import com.mongodb.MongoClient;
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import com.mongodb.client.FindIterable;
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import com.mongodb.client.MongoCollection;
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import com.mongodb.client.MongoCursor;
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import com.mongodb.client.MongoDatabase;
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import org.bson.BsonDocument;
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import org.bson.Document;
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import org.bson.conversions.Bson;
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import static com.mongodb.client.model.Filters.*;
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public class InsertFieldIntoFilter {
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private static MongoClient mongoClient;
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private static MongoDatabase database;
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private static MongoCollection<Document> collection;
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private static String collectionName;
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private static String databaseName;
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public static void setUp() {
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if (mongoClient == null) {
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mongoClient = new MongoClient("localhost", 27017);
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databaseName = "baeldung";
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collectionName = "pet";
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database = mongoClient.getDatabase(databaseName);
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collection = database.getCollection(collectionName);
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}
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}
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public static void addFieldToExistingBsonFilter() {
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Bson existingFilter = and(eq("type", "Dog"), eq("gender", "Male"));
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Bson newFilter = and(existingFilter, gt("age", 5));
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FindIterable<Document> documents = collection.find(newFilter);
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MongoCursor<Document> cursor = documents.iterator();
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while (cursor.hasNext()) {
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System.out.println(cursor.next());
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}
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}
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public static void addFieldToExistingBsonFilterUsingBsonDocument() {
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Bson existingFilter = eq("type", "Dog");
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BsonDocument existingBsonDocument = existingFilter.toBsonDocument(BsonDocument.class, MongoClient.getDefaultCodecRegistry());
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Bson newFilter = gt("age", 5);
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BsonDocument newBsonDocument = newFilter.toBsonDocument(BsonDocument.class, MongoClient.getDefaultCodecRegistry());
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existingBsonDocument.append("age", newBsonDocument.get("age"));
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FindIterable<Document> documents = collection.find(existingBsonDocument);
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MongoCursor<Document> cursor = documents.iterator();
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while (cursor.hasNext()) {
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System.out.println(cursor.next());
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}
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}
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public static void main(String args[]) {
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setUp();
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addFieldToExistingBsonFilter();
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addFieldToExistingBsonFilterUsingBsonDocument();
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}
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}
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package com.baeldung.mongo.insert;
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import com.baeldung.mongo.find.FindOperationLiveTest;
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import com.mongodb.MongoClient;
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import com.mongodb.client.MongoCollection;
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import com.mongodb.client.MongoCursor;
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import com.mongodb.client.MongoDatabase;
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import org.bson.BsonDocument;
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import org.bson.Document;
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import org.bson.conversions.Bson;
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import org.junit.BeforeClass;
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import org.junit.Test;
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import java.io.BufferedReader;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.InputStreamReader;
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import static com.mongodb.client.model.Filters.*;
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import static org.junit.Assert.assertNotNull;
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import static org.junit.Assert.assertTrue;
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public class InsertFieldIntoFilterLiveTest {
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private static MongoClient mongoClient;
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private static MongoDatabase database;
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private static MongoCollection<Document> collection;
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private static final String DATASET_JSON = "/pet.json";
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@BeforeClass
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public static void setUp() throws IOException {
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if (mongoClient == null) {
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mongoClient = new MongoClient("localhost", 27017);
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database = mongoClient.getDatabase("baeldung");
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collection = database.getCollection("pet");
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collection.drop();
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InputStream is = FindOperationLiveTest.class.getResourceAsStream(DATASET_JSON);
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BufferedReader reader = new BufferedReader(new InputStreamReader(is));
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reader.lines()
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.forEach(line -> collection.insertOne(Document.parse(line)));
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reader.close();
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}
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}
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@Test
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public void givenPetCollection_whenFetchingAfterAddingFieldToFilter_thenFindMatchingDocuments() {
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Bson existingFilter = and(eq("type", "Dog"), eq("gender", "Male"));
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Bson newFilter = and(existingFilter, gt("age", 5));
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MongoCursor<Document> cursor = collection.find(newFilter).iterator();
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assertNotNull(cursor);
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assertTrue(cursor.hasNext());
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}
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@Test
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public void givenPetCollection_whenFetchingAfterAddingFieldToFilterUsingBsonDocument_thenFindMatchingDocuments() {
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Bson existingFilter = eq("type", "Dog");
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BsonDocument existingBsonDocument = existingFilter.toBsonDocument(BsonDocument.class, MongoClient.getDefaultCodecRegistry());
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Bson newFilter = gt("age", 5);
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BsonDocument newBsonDocument = newFilter.toBsonDocument(BsonDocument.class, MongoClient.getDefaultCodecRegistry());
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existingBsonDocument.append("age", newBsonDocument.get("age"));
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MongoCursor<Document> cursor = collection.find(existingBsonDocument).iterator();
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assertNotNull(cursor);
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assertTrue(cursor.hasNext());
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}
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}
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@ -0,0 +1,3 @@
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{"petId":"P1","name":"Tom","age":3,"type":"Cat","gender":"Female"}
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{"petId":"P2","name":"Max","age":4,"type":"Dog","gender":"Male"}
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{"petId":"P3","name":"Milo","age":8,"type":"Dog","gender":"Male"}
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