In this mongoDB tutorial we will write java programs to FIND documents where field is (less than) using lt and lte operator in Collection In MongoDb in java.
Contents of page >
- 1) Program to Query Document From Collection In MongoDb in java using lt and lte Operators >
- 1.1) Program to Query Document From Collection In MongoDb in java using lt (less than) Operator >
- 1.2) Program to Query Document From Collection In MongoDb in java using lte (less than equal) Operator >
1) Program to Query Document From Collection In MongoDb in java using lt and lte Operators >
1.1) Program to Query Document From Collection In MongoDb in java using lt (less than) Operator >
FIND documents where id < 2
package queryDocumentFromCollectionInMongoDb;
/**
* Write a program to Query Document From Collection In MongoDb in java using Lt And Lte Operator
*/
import com.mongodb.BasicDBObject;
import com.mongodb.DB;
import com.mongodb.DBCollection;
import com.mongodb.DBCursor;
import com.mongodb.MongoClient;
import com.mongodb.MongoClientURI;
import com.mongodb.WriteResult;
public class QueryDocumentFromCollectionInMongoDb5_usingLtAndLteOperator {
public static void main(String[] args) {
/* Connect to MongoDB */
MongoClient mongoClient =
new MongoClient(new MongoClientURI("mongodb://localhost:27017"));
/* Connect to DATABASE */
//If in case database doesn't exists, it will be created at runtime
DB db = mongoClient.getDB("mydb");
/* Get the COLLECTION (TABLE) */
//If in case collection (Table) doesn't exists, it will be created at runtime
DBCollection dbCollection = db.getCollection("Employee");
/*If collection already exists, you may remove everything
from collection for perfect OUTPUT of program*/
dbCollection.remove(new BasicDBObject()); //Not Mandatory
/* create a BasicDBObject1 (document /record) */
BasicDBObject basicDBObject1 = new BasicDBObject();
basicDBObject1.put("id", 1);
basicDBObject1.put("name", "Ankit");
/* Insert document1/record1 in COLLECTION in MongoDB */
System.out.println("Insert document1");
dbCollection.insert(basicDBObject1);
/* create a BasicDBObject2 (document /record) */
BasicDBObject basicDBObject2 = new BasicDBObject();
basicDBObject2.put("id", 2);
basicDBObject2.put("name", "Sam");
/* Insert document2 in collection in MongoDB */
System.out.println("Insert document2");
dbCollection.insert(basicDBObject2);
/* create a BasicDBObject3 (document /record) */
BasicDBObject basicDBObject3 = new BasicDBObject();
basicDBObject3.put("id", 3);
basicDBObject3.put("name", "Neh");
/* Insert document3 in collection in MongoDB */
System.out.println("Insert document3");
dbCollection.insert(basicDBObject3);
/* Display documents of collection before QUERING DOCUMENTs in MongoDB */
System.out.println("\nDisplay collection "
+ "before QUERING collection in MongoDB");
DBCursor cursor0 = dbCollection.find();
while (cursor0.hasNext()) {
System.out.println(cursor0.next());
}
/** At this stage dbCollection looks like this >
{ "_id" : { "$oid" : "58559179ad8dc831e8df7a3e"} , "id" : 1 , "name" : "Ankit"}
{ "_id" : { "$oid" : "58559179ad8dc831e8df7a3f"} , "id" : 2 , "name" : "Sam"}
{ "_id" : { "$oid" : "58559179ad8dc831e8df7a40"} , "id" : 3 , "name" : "Neh"}
*/
/** Now, let's FIND the documents from collection in MongoDB */
/** FIND documents where id < 2 */
BasicDBObject basicDBObject_SearchCondition = new BasicDBObject();
//$lt operator is for LESS THAN
//Pass > $lt as key > and > 2 as value
basicDBObject_SearchCondition.put("id",
new BasicDBObject("$lt", 2));
/** Execute FIND/SEARCH query - To FIND DOCUMENT in MongoDB */
//find method Select documents in collection and returns cursor to the selected documents.
System.out.println("\nExecute FIND query where id < 2 ");
DBCursor cursor = dbCollection.find(basicDBObject_SearchCondition);
/* Display documents of collection after QUERING collection in MongoDB */
System.out.println("\nDisplay documents of collection "
+ "after QUERING collection in MongoDB ");
while (cursor.hasNext()) {
System.out.println(cursor.next());
}
/** At this stage dbCollection looks like this >
{ "_id" : { "$oid" : "58559179ad8dc831e8df7a3e"} , "id" : 1 , "name" : "Ankit"}
*/
}
}
/* OUTPUT
Insert document1
Insert document2
Insert document3
Display collection before QUERING collection in MongoDB
{ "_id" : { "$oid" : "58559179ad8dc831e8df7a3e"} , "id" : 1 , "name" : "Ankit"}
{ "_id" : { "$oid" : "58559179ad8dc831e8df7a3f"} , "id" : 2 , "name" : "Sam"}
{ "_id" : { "$oid" : "58559179ad8dc831e8df7a40"} , "id" : 3 , "name" : "Neh"}
Execute FIND query where id < 2
Display documents of collection after QUERING collection in MongoDB
{ "_id" : { "$oid" : "58559179ad8dc831e8df7a3e"} , "id" : 1 , "name" : "Ankit"}
*/
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1.2) Program to Query Document From Collection In MongoDb in java using lte (less than equal) Operator >
FIND documents where id <= 2
FIND documents where id <= 2 From this collection
{ "_id" : { "$oid" : "58559179ad8dc831e8df7a3e"} , "id" : 1 , "name" : "Ankit"}
{ "_id" : { "$oid" : "58559179ad8dc831e8df7a3f"} , "id" : 2 , "name" : "Sam"}
{ "_id" : { "$oid" : "58559179ad8dc831e8df7a40"} , "id" : 3 , "name" : "Neh"}
BasicDBObject basicDBObject_SearchCondition = new BasicDBObject();
//$lte operator is for LESS THAN EQUAL
//Pass > $lte as key - and - 2 as value
basicDBObject_SearchCondition.put("id", new BasicDBObject("$lte", 2));
Result
{ "_id" : { "$oid" : "58559179ad8dc831e8df7a3e"} , "id" : 1 , "name" : "Ankit"}
{ "_id" : { "$oid" : "58559179ad8dc831e8df7a3f"} , "id" : 2 , "name" : "Sam"}
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MongoDB Java
Query/Read MongoDb Java