Untitled

[03/11, 9:17 am] Tanmay Karmarkar: com.mongodb.client.FindIterable;
import com.mongodb.client.MongoCollection;
import com.mongodb.client.MongoDatabase;
import com.mongodb.client.model.Filters;
import com.mongodb.client.model.Updates;
import java.util.Scanner;
import java.util.Iterator;
import org.bson.Document;
import com.mongodb.MongoClient;
public class AssignmentNo_B4
{
public static void main( String args[] ) 
{ 
try
{
Scanner sc = new Scanner(System.in);
int studentID = 0, UG_POYear = 0;
String fName = 
"", lName = "", UG_Dept = "", curr_city = "", email = "";
MongoClient mongo = new MongoClient( "localhost" , 27017 );
System.out.println("\n\t Connected to the database successfully...!!");
MongoDatabase database = mongo.getDatabase("assignment_no_12");
MongoCollection<Document> collection = database.getCollection("Student");
System.out.println("\n\t Collection Student selected successfully...!!");
int choice;
while(true)
{
System.out.println("\n\t === Main Menu === \n\t\t 1. Insert Data"
+ "\n\t\t 2. Display Data"
+ "\n\t\t 3. Update Document"
+ "\n\t\t 4. Delete Document"
+ "\n\t\t 5. Drop Collection"
+ "\n\t\t 6. Exit");
System.out.print("\n\t Enter Choice : ");
choice = sc.nextInt();
switch(choice)
[03/11, 9:17 am] Tanmay Karmarkar: case 1:
System.out.print("\n\t Enter the ID of Student : ");
studentID = sc.nextInt();
System.out.print("\n\t Enter the First Name of Student : ");
fName = sc.next();
System.out.print("\n\t Enter the Last Name of Student : ");
lName = sc.next();
System.out.print("\n\t Enter the UG_POYear of Student : ");
UG_POYear = sc.nextInt();
System.out.print("\n\t Enter the UG_Dept of Student : ");
UG_Dept = sc.next();
System.out.print("\n\t Enter the curr_city of Student : ");
curr_city = sc.next();
System.out.print("\n\t Enter the email of Student : ");
email = sc.next();
Document document = new Document("_id", studentID)
.append("fName", fName)
.append("lName", lName)
.append("UG_POYear", UG_POYear)
.append("UG_Dept", UG_Dept)
.append("curr_city", curr_city)
.append("email", email);
collection.insertOne(document);
System.out.println("\n\t Document Inserted Successfully...!! \n");
break;
case 2:
FindIterable<Document> iterDoc = collection.find();
Iterator<Document> it = iterDoc.iterator();
while (it.hasNext()) {
System.out.println(it.next());
} 
break;
case 3:
int ch = 0;
System.out.print("\n\t Enter ID of student to update Data : ");
studentID = sc.nextInt();
System.out.print("\n\t\t == UPDATE == \n\t\t\t 1. fName"
+ "\n\t\t\t 2. lName \n\t\t\t 3. UG_POYear"
+ "\n\t\t\t 4. UG_Dept \n\t\t\t 5. curr_city"
+ "\n\t\t\t 6. email \n\t\t\t 7. Cancel"
+ "\n\t\t Enter Choice = ");
ch = sc.nextInt();
if(ch == 1)
{
System.out.print("\n\t Enter new First name of student : ");
fName = sc.next();
collection.updateOne(Filters.eq("_id", studentID), 
Updates.set("fName", fName));
System.out.println("\n\t Document Updated Successfully...!! 
\n");
}
else if(ch == 2)
[03/11, 9:17 am] Tanmay Karmarkar: System.out.print("\n\t Enter new Last name of student : ");
lName = sc.next();
collection.updateOne(Filters.eq("_id", studentID), 
Updates.set("lName", lName));
System.out.println("\n\t Document Updated Successfully...!! 
\n");
}
else if(ch == 3)
{
System.out.print("\n\t Enter new UG PassOut Year of student : 
");
UG_POYear = sc.nextInt();
collection.updateOne(Filters.eq("_id", studentID), 
Updates.set("UG_POYear", UG_POYear));
System.out.println("\n\t Document Updated Successfully...!! 
\n");
}
else if(ch == 4)
{
System.out.print("\n\t Enter new UG Department of student : 
");
UG_Dept = sc.next();
collection.updateOne(Filters.eq("_id", studentID), 
Updates.set("UG_Dept", UG_Dept));
System.out.println("\n\t Document Updated Successfully...!! 
\n");
}
else if(ch == 5)
{
System.out.print("\n\t Enter new Current City of student : ");
curr_city = sc.next();
collection.updateOne(Filters.eq("_id", studentID), 
Updates.set("curr_city", curr_city));
System.out.println("\n\t Document Updated Successfully...!! 
\n");
}
else if(ch == 6)
{
System.out.print("\n\t Enter new email of student : ");
email = sc.next();
collection.updateOne(Filters.eq("_id", studentID), 
Updates.set("email", email));
System.out.println("\n\t Document Updated Successfully...!!");
}
else if(ch == 7)
{
System.out.println("\n\t Operation Cancelled 
Successfully...!!");
break;
}
else
{
System.out.println("\n\t Invalid Choice...!!! \n");
break;
} 
break;
case 4:
[03/11, 9:17 am] Tanmay Karmarkar: System.out.print("\n\t Enter ID of student to delete Data : ");
studentID = sc.nextInt();
collection.deleteOne(Filters.eq("_id", studentID));
System.out.println("\n\t Document Deleted Successfully...!!\n");
break;
case 5:
collection.drop();
System.out.println("\n\t\t\t\t _______ Thank You ..! ______ \n");
sc.close();
mongo.close();
System.exit(0);
break; 
case 6:
System.out.println("\n\t\t\t\t _______ Thank You ..! ______ \n");
sc.close();
mongo.close();
System.exit(0);
default:
System.out.println("\n\t Invalid Choice...!!! \n");
break;
}
}
}
catch(Exception e)
{
e.printStackTrace();