“find”
method of collection(without any arguments) returns all the documents in given
collection.
>
db.employee.find()
{
"_id" : 1, "firstName" : "Joel",
"lastName" : "chelli" }
{
"_id" : 2, "firstName" : "Ananad",
"lastName" : "Bandaru" }
{
"_id" : 3, "firstName" : "Gopi",
"lastName" : "Battu" }
{
"_id" : 4, "firstName" : "Ritwik",
"lastName" : "Mohenthy" }
Let’s
say I had above data in my employee collection.
import java.net.UnknownHostException; import com.mongodb.DBCursor; import com.mongodb.MongoClient; import com.mongodb.DB; import com.mongodb.DBCollection; public class FindDocument { /* Step 1 : get mongoCLient */ public static MongoClient getMongoClient(){ MongoClient mongoClient = null; try { mongoClient = new MongoClient( "localhost" , 27017 ); } catch (UnknownHostException e) { e.printStackTrace(); } return mongoClient; } public static void main(String args[]){ MongoClient mongoClient = getMongoClient(); /* Step 2: Connect to DB */ DB db = mongoClient.getDB("sample"); /*Step 3 : Get collection */ DBCollection collection = db.getCollection("employee"); /* Step 4 : Get all documents */ DBCursor cursor = collection.find(); /* Step 5 : Get all documents */ while(cursor.hasNext()){ System.out.println(cursor.next()); } } }
Output
{ "_id" : 1.0 , "firstName" : "Joel" , "lastName" : "chelli"} { "_id" : 2.0 , "firstName" : "Ananad" , "lastName" : "Bandaru"} { "_id" : 3.0 , "firstName" : "Gopi" , "lastName" : "Battu"} { "_id" : 4.0 , "firstName" : "Ritwik" , "lastName" : "Mohenthy"}
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