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- Program to Create Connection To MongoDb In Java
Program to Create Connection To MongoDb In Java
package createConnectionInMongoDB;
/**
* Write a program to Create Connection To MongoDb In Java
*/
import com.mongodb.BasicDBObject;
import com.mongodb.DB;
import com.mongodb.DBCollection;
import com.mongodb.DBCursor;
import com.mongodb.MongoClient;
import com.mongodb.MongoClientURI;
public class CreateConnectionToMongoDbInJava {
public static void main(String[] args) {
/** Step-1 > Connect to MongoDB */
System.out.println("Step-1 > Connect to MongoDB");
MongoClient mongoClient =
new MongoClient(new MongoClientURI("mongodb://localhost:27017"));
/** Step-2 > Connect to DATABASE */
//If in case database doesn't exists, it will be created at runtime
System.out.println("Step-2 > Connect to DATABASE");
DB db = mongoClient.getDB("mydb");
/* Step-3 > Get the COLLECTION (TABLE) */
//If in case collection (Table) doesn't exists, it will be created at runtime
System.out.println("Step-3 > Get the COLLECTION (TABLE)");
DBCollection dbCollection = db.getCollection("employee");
/* Step-4 > Not Mandatory
If collection already exists, you may remove everything
from collection for perfect OUTPUT of program*/
System.out.println("Step-4 > Not Mandatory");
dbCollection.remove(new BasicDBObject());
/** Step- 5 and 6 - INSERT > */
System.out.println("Step- 5 and 6 - INSERT >");
/** Step-5.1 > create a BasicDBObject1 (document /record) */
BasicDBObject basicDBObject1 = new BasicDBObject();
basicDBObject1.put("id", 1); //Id is the column name, 1 is the value of column
basicDBObject1.put("name", "Ankit");
/** Step-5.2 > INSERT document1/record1 in COLLECTION in MongoDB */
System.out.println("Step-5.2 > INSERT document1/record1 in COLLECTION in MongoDB");
dbCollection.insert(basicDBObject1);
/** Step-6.1 > create a BasicDBObject2 (document /record) */
BasicDBObject basicDBObject2 = new BasicDBObject();
basicDBObject2.put("id", 2); //Id is the column name, 2 is the value of column
basicDBObject2.put("name", "Sam");
/** Step-6.2 > INSERT document2/record2 in COLLECTION in MongoDB */
System.out.println("Step-6.2 > INSERT document1/record1 in COLLECTION in MongoDB");
dbCollection.insert(basicDBObject2);
/* Step-7 > Display documents of COLLECTION in MongoDB */
System.out.println("Step-7 > Display documents of COLLECTION in MongoDB");
DBCursor dbCursor = dbCollection.find();
while (dbCursor.hasNext()) {
System.out.println(dbCursor.next());
}
}
}
/*OUTPUT
Step-1 > Connect to MongoDB
Step-2 > Connect to DATABASE
Step-3 > Get the COLLECTION (TABLE)
Step-4 > Not Mandatory
Step- 5 and 6 - INSERT >
Step-5.2 > INSERT document1/record1 in COLLECTION in MongoDB
Step-6.2 > INSERT document1/record1 in COLLECTION in MongoDB
Step-7 > Display documents of COLLECTION in MongoDB
{ "_id" : { "$oid" : "585c06a87dbba63be8c8e231"} , "id" : 1 , "name" : "Ankit"}
{ "_id" : { "$oid" : "585c06a97dbba63be8c8e232"} , "id" : 2 , "name" : "Sam"}
*/
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Summary -
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