BAEL-5833 | Article code (#12919)

* BAEL-5833 | Article code * Updated method name
2022-11-07 08:26:18 +05:30
parent ca8e33e339
commit c57284d9c9
4 changed files with 291 additions and 1 deletions
@@ -0,0 +1,134 @@
+package com.baeldung.mongo.filter;
+
+import com.mongodb.MongoClient;
+import com.mongodb.client.FindIterable;
+import com.mongodb.client.MongoCollection;
+import com.mongodb.client.MongoCursor;
+import com.mongodb.client.MongoDatabase;
+import org.bson.Document;
+import org.bson.conversions.Bson;
+
+import static com.mongodb.client.model.Filters.*;
+
+public class FilterOperation {
+
+    private static MongoClient mongoClient;
+    private static MongoDatabase database;
+    private static MongoCollection<Document> collection;
+    private static String collectionName;
+    private static String databaseName;
+
+    public static void setUp() {
+        if (mongoClient == null) {
+            mongoClient = new MongoClient("localhost", 27017);
+
+            databaseName = "baeldung";
+            collectionName = "user";
+
+            database = mongoClient.getDatabase(databaseName);
+            collection = database.getCollection(collectionName);
+        }
+    }
+
+    public static void equalsOperator() {
+        Bson filter = eq("userName", "Jack");
+        FindIterable<Document> documents = collection.find(filter);
+
+        printResult(documents);
+    }
+
+    public static void notEqualOperator() {
+        Bson filter = ne("userName", "Jack");
+        FindIterable<Document> documents = collection.find(filter);
+
+        printResult(documents);
+    }
+
+    public static void greaterThanOperator() {
+        Bson filter = gt("age", 25);
+        FindIterable<Document> documents = collection.find(filter);
+
+        printResult(documents);
+    }
+
+    public static void lessThanOperator() {
+        Bson filter = lt("age", 25);
+        FindIterable<Document> documents = collection.find(filter);
+
+        printResult(documents);
+    }
+
+    public static void inOperator() {
+        Bson filter = in("userName", "Jack", "Lisa");
+        FindIterable<Document> documents = collection.find(filter);
+
+        printResult(documents);
+    }
+
+    public static void notInOperator() {
+        Bson filter = nin("userName", "Jack", "Lisa");
+        FindIterable<Document> documents = collection.find(filter);
+
+        printResult(documents);
+    }
+
+    public static void andOperator() {
+        Bson filter = and(gt("age", 25), eq("role", "Admin"));
+        FindIterable<Document> documents = collection.find(filter);
+
+        printResult(documents);
+    }
+
+    public static void orOperator() {
+        Bson filter = or(gt("age", 30), eq("role", "Admin"));
+        FindIterable<Document> documents = collection.find(filter);
+
+        printResult(documents);
+    }
+
+    public static void existsOperator() {
+        Bson filter = exists("type");
+        FindIterable<Document> documents = collection.find(filter);
+
+        printResult(documents);
+    }
+
+    public static void regexOperator() {
+        Bson filter = regex("userName", "a");
+        FindIterable<Document> documents = collection.find(filter);
+
+        printResult(documents);
+    }
+
+    private static void printResult(FindIterable<Document> documents) {
+        MongoCursor<Document> cursor = documents.iterator();
+        while (cursor.hasNext()) {
+            System.out.println(cursor.next());
+        }
+    }
+
+    public static void main(String args[]) {
+
+        setUp();
+
+        equalsOperator();
+
+        notEqualOperator();
+
+        greaterThanOperator();
+
+        lessThanOperator();
+
+        inOperator();
+
+        notInOperator();
+
+        andOperator();
+
+        orOperator();
+
+        existsOperator();
+
+        regexOperator();
+    }
+}