The application flow is
This diagram illustrates the basic architecture of a Java application connected to MongoDB.
- Java Application – The application written in Java performs operations such as inserting, retrieving, updating, and deleting student data.
- MongoDB Java Driver – Acts as a bridge between the Java application and MongoDB, allowing Java code to communicate with the database.
- MongoDB Server – The MongoDB server receives requests from the Java application and manages the stored data.
- studentdb Database – A database created in MongoDB to organize and store student-related information.
- students Collection – A collection inside the
studentdbdatabase that contains student documents and their details.
Application Architecture
Prerequisites
Install the following:
Java
Check Java:
java -version
Maven
Check Maven:
mvn -version
MongoDB
Make sure MongoDB Server is running.
The application will connect to:
mongodb://localhost:27017
Create the Maven Project
In IntelliJ IDEA:
File -> New -> Project -> Maven
Enter:
GroupId : com.sample
ArtifactId : mongodb
Project name:
MongoDBStudentCRUD
Create below files
The pom.xml contains the MongoDB Java Driver dependency.
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>org.sample</groupId>
<artifactId>mongodb</artifactId>
<version>1.0-SNAPSHOT</version>
<properties>
<maven.compiler.source>17</maven.compiler.source>
<maven.compiler.target>17</maven.compiler.target>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
<!-- https://mvnrepository.com/artifact/org.mongodb/mongo-java-driver -->
<dependency>
<groupId>org.mongodb</groupId>
<artifactId>mongo-java-driver</artifactId>
<version>3.12.14</version>
</dependency>
</dependencies>
</project>package org.sample;
public class Student {
private String id;
private String name;
private int age;
private String department;
private String email;
private double cgpa;
public Student() {
}
public Student(String name, int age, String department,
String email, double cgpa) {
this.name = name;
this.age = age;
this.department = department;
this.email = email;
this.cgpa = cgpa;
}
public Student(String id, String name, int age,
String department, String email, double cgpa) {
this.id = id;
this.name = name;
this.age = age;
this.department = department;
this.email = email;
this.cgpa = cgpa;
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public String getDepartment() {
return department;
}
public void setDepartment(String department) {
this.department = department;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public double getCgpa() {
return cgpa;
}
public void setCgpa(double cgpa) {
this.cgpa = cgpa;
}
@Override
public String toString() {
return "Student{" +
"id='" + id + '\'' +
", name='" + name + '\'' +
", age=" + age +
", department='" + department + '\'' +
", email='" + email + '\'' +
", cgpa=" + cgpa +
'}';
}
}package org.sample;
import com.mongodb.client.MongoCollection;
import com.mongodb.client.MongoDatabase;
import org.bson.Document;
import org.bson.types.ObjectId;
import java.util.ArrayList;
import java.util.List;
import static com.mongodb.client.model.Filters.eq;
public class StudentDAO {
private final MongoCollection<Document> collection;
public StudentDAO() {
MongoDatabase database =
MongoDBConnection.getDatabase();
collection = database.getCollection("students");
}
// CREATE
public String createStudent(Student student) {
Document document = new Document()
.append("name", student.getName())
.append("age", student.getAge())
.append("department", student.getDepartment())
.append("email", student.getEmail())
.append("cgpa", student.getCgpa());
collection.insertOne(document);
return document.getObjectId("_id").toHexString();
}
// READ ALL
public List<Student> getAllStudents() {
List<Student> students = new ArrayList<>();
for (Document document : collection.find()) {
Student student = convertDocumentToStudent(document);
students.add(student);
}
return students;
}
// READ BY ID
public Student getStudentById(String id) {
Document document = collection.find(
eq("_id", new ObjectId(id))
).first();
if (document == null) {
return null;
}
return convertDocumentToStudent(document);
}
// UPDATE
public boolean updateStudent(String id, Student student) {
Document updateDocument = new Document()
.append("name", student.getName())
.append("age", student.getAge())
.append("department", student.getDepartment())
.append("email", student.getEmail())
.append("cgpa", student.getCgpa());
var result = collection.updateOne(
eq("_id", new ObjectId(id)),
new Document("$set", updateDocument)
);
return result.getModifiedCount() > 0;
}
// DELETE
public boolean deleteStudent(String id) {
var result = collection.deleteOne(
eq("_id", new ObjectId(id))
);
return result.getDeletedCount() > 0;
}
// Convert MongoDB Document to Student
private Student convertDocumentToStudent(Document document) {
return new Student(
document.getObjectId("_id").toHexString(),
document.getString("name"),
document.getInteger("age"),
document.getString("department"),
document.getString("email"),
document.getDouble("cgpa")
);
}
}package org.sample;
import com.mongodb.client.MongoClient;
import com.mongodb.client.MongoClients;
import com.mongodb.client.MongoDatabase;
public class MongoDBConnection {
private static final String CONNECTION_STRING =
"mongodb://localhost:27017";
private static final String DATABASE_NAME =
"studentdb";
private static MongoClient mongoClient;
public static MongoDatabase getDatabase() {
if (mongoClient == null) {
mongoClient = MongoClients.create(CONNECTION_STRING);
}
return mongoClient.getDatabase(DATABASE_NAME);
}
public static void closeConnection() {
if (mongoClient != null) {
mongoClient.close();
mongoClient = null;
}
}
}package org.sample;
import java.util.List;
import java.util.Scanner;
public class StudentApplication {
private static final Scanner scanner =
new Scanner(System.in);
private static final StudentDAO studentDAO =
new StudentDAO();
public static void main(String[] args) {
int choice;
do {
displayMenu();
System.out.print("Enter your choice: ");
choice = scanner.nextInt();
scanner.nextLine();
switch (choice) {
case 1:
createStudent();
break;
case 2:
getAllStudents();
break;
case 3:
getStudentById();
break;
case 4:
updateStudent();
break;
case 5:
deleteStudent();
break;
case 6:
System.out.println(
"Exiting application..."
);
break;
default:
System.out.println(
"Invalid choice!"
);
}
} while (choice != 6);
MongoDBConnection.closeConnection();
scanner.close();
}
private static void displayMenu() {
System.out.println();
System.out.println("================================");
System.out.println(" STUDENT MANAGEMENT SYSTEM");
System.out.println("================================");
System.out.println("1. Create Student");
System.out.println("2. Display All Students");
System.out.println("3. Find Student By ID");
System.out.println("4. Update Student");
System.out.println("5. Delete Student");
System.out.println("6. Exit");
System.out.println("================================");
}
// CREATE
private static void createStudent() {
System.out.println("\n--- Create Student ---");
System.out.print("Name: ");
String name = scanner.nextLine();
System.out.print("Age: ");
int age = scanner.nextInt();
scanner.nextLine();
System.out.print("Department: ");
String department = scanner.nextLine();
System.out.print("Email: ");
String email = scanner.nextLine();
System.out.print("CGPA: ");
double cgpa = scanner.nextDouble();
scanner.nextLine();
Student student = new Student(
name,
age,
department,
email,
cgpa
);
String id = studentDAO.createStudent(student);
System.out.println(
"Student created successfully!"
);
System.out.println(
"Generated ID: " + id
);
}
// READ ALL
private static void getAllStudents() {
System.out.println("\n--- All Students ---");
List<Student> students =
studentDAO.getAllStudents();
if (students.isEmpty()) {
System.out.println(
"No students found."
);
return;
}
for (Student student : students) {
System.out.println(student);
}
}
// READ BY ID
private static void getStudentById() {
System.out.println("\n--- Find Student ---");
System.out.print("Enter Student ID: ");
String id = scanner.nextLine();
try {
Student student =
studentDAO.getStudentById(id);
if (student != null) {
System.out.println(student);
} else {
System.out.println(
"Student not found."
);
}
} catch (IllegalArgumentException e) {
System.out.println(
"Invalid MongoDB ObjectId."
);
}
}
// UPDATE
private static void updateStudent() {
System.out.println("\n--- Update Student ---");
System.out.print("Enter Student ID: ");
String id = scanner.nextLine();
try {
Student existing =
studentDAO.getStudentById(id);
if (existing == null) {
System.out.println(
"Student not found."
);
return;
}
System.out.print("New Name: ");
String name = scanner.nextLine();
System.out.print("New Age: ");
int age = scanner.nextInt();
scanner.nextLine();
System.out.print("New Department: ");
String department = scanner.nextLine();
System.out.print("New Email: ");
String email = scanner.nextLine();
System.out.print("New CGPA: ");
double cgpa = scanner.nextDouble();
scanner.nextLine();
Student student = new Student(
name,
age,
department,
email,
cgpa
);
boolean updated =
studentDAO.updateStudent(
id,
student
);
if (updated) {
System.out.println(
"Student updated successfully!"
);
} else {
System.out.println(
"Student was not updated."
);
}
} catch (IllegalArgumentException e) {
System.out.println(
"Invalid MongoDB ObjectId."
);
}
}
// DELETE
private static void deleteStudent() {
System.out.println("\n--- Delete Student ---");
System.out.print("Enter Student ID: ");
String id = scanner.nextLine();
try {
boolean deleted =
studentDAO.deleteStudent(id);
if (deleted) {
System.out.println(
"Student deleted successfully!"
);
} else {
System.out.println(
"Student not found."
);
}
} catch (IllegalArgumentException e) {
System.out.println(
"Invalid MongoDB ObjectId."
);
}
}
}Right click on the StudentApplication and Run the StudentApplication
Execution and Output:
"C:\Program Files\Java\jdk-17\bin\java.exe" "-javaagent:C:\Program Files\JetBrains\IntelliJ IDEA 2025.3.1\lib\idea_rt.jar=50886" -Dfile.encoding=UTF-8 -classpath C:\Users\dudek\OneDrive\Desktop\mongodb\target\classes;C:\Users\dudek\.m2\repository\org\mongodb\mongo-java-driver\3.12.14\mongo-java-driver-3.12.14.jar org.sample.StudentApplication
Aug 29, 2026 7:09:37 PM com.mongodb.diagnostics.logging.JULLogger log
INFO: Cluster created with settings {hosts=[localhost:27017], mode=SINGLE, requiredClusterType=UNKNOWN, serverSelectionTimeout='30000 ms', maxWaitQueueSize=500}
================================
STUDENT MANAGEMENT SYSTEM
================================
1. Create Student
2. Display All Students
3. Find Student By ID
4. Update Student
5. Delete Student
6. Exit
================================
Enter your choice: Aug 29, 2026 7:09:37 PM com.mongodb.diagnostics.logging.JULLogger log
INFO: Opened connection [connectionId{localValue:1, serverValue:1}] to localhost:27017
Aug 29, 2026 7:09:37 PM com.mongodb.diagnostics.logging.JULLogger log
INFO: Monitor thread successfully connected to server with description ServerDescription{address=localhost:27017, type=STANDALONE, state=CONNECTED, ok=true, version=ServerVersion{versionList=[7, 0, 5]}, minWireVersion=0, maxWireVersion=21, maxDocumentSize=16777216, logicalSessionTimeoutMinutes=30, roundTripTimeNanos=4444300}
1
--- Create Student ---
Name: Lakshman
Age: 25
Department: IT
Email: lakshman@gmail.com
CGPA: 9.4
Aug 29, 2026 7:11:17 PM com.mongodb.diagnostics.logging.JULLogger log
INFO: Opened connection [connectionId{localValue:2, serverValue:2}] to localhost:27017
Student created successfully!
Generated ID: 6a92e17dedb9333e5964473a
================================
STUDENT MANAGEMENT SYSTEM
================================
1. Create Student
2. Display All Students
3. Find Student By ID
4. Update Student
5. Delete Student
6. Exit
================================
Enter your choice: 1
--- Create Student ---
Name: Mahesh
Age: 24
Department: IT
Email: mahesh@gmail.com
CGPA: 9.3
Student created successfully!
Generated ID: 6a92e1b1edb9333e5964473b
================================
STUDENT MANAGEMENT SYSTEM
================================
1. Create Student
2. Display All Students
3. Find Student By ID
4. Update Student
5. Delete Student
6. Exit
================================
Enter your choice: 2
--- All Students ---
Student{id='6a92e17dedb9333e5964473a', name='Lakshman', age=25, department='IT', email='lakshman@gmail.com', cgpa=9.4}
Student{id='6a92e1b1edb9333e5964473b', name='Mahesh', age=24, department='IT', email='mahesh@gmail.com', cgpa=9.3}
================================
STUDENT MANAGEMENT SYSTEM
================================
1. Create Student
2. Display All Students
3. Find Student By ID
4. Update Student
5. Delete Student
6. Exit
================================
Enter your choice: 3
--- Find Student ---
Enter Student ID: 6a92e17dedb9333e5964473a
Student{id='6a92e17dedb9333e5964473a', name='Lakshman', age=25, department='IT', email='lakshman@gmail.com', cgpa=9.4}
================================
STUDENT MANAGEMENT SYSTEM
================================
1. Create Student
2. Display All Students
3. Find Student By ID
4. Update Student
5. Delete Student
6. Exit
================================
Enter your choice: 4
--- Update Student ---
Enter Student ID: 6a92e17dedb9333e5964473a
New Name: Lakshmi Narayana
New Age: 26
New Department: Product Manager
New Email:
New CGPA: 9.2
Student updated successfully!
================================
STUDENT MANAGEMENT SYSTEM
================================
1. Create Student
2. Display All Students
3. Find Student By ID
4. Update Student
5. Delete Student
6. Exit
================================
Enter your choice: 5
--- Delete Student ---
Enter Student ID: 6a92e1b1edb9333e5964473b
Student deleted successfully!
================================
STUDENT MANAGEMENT SYSTEM
================================
1. Create Student
2. Display All Students
3. Find Student By ID
4. Update Student
5. Delete Student
6. Exit
================================
Enter your choice: 6
Exiting application...
Process finished with exit code 0
Code language: PHP (php)Employee Table
Application Architecture
Now create the below files,
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>org.employee</groupId>
<artifactId>mongodb</artifactId>
<version>1.0-SNAPSHOT</version>
<properties>
<maven.compiler.source>17</maven.compiler.source>
<maven.compiler.target>17</maven.compiler.target>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
<!-- https://mvnrepository.com/artifact/org.mongodb/mongo-java-driver -->
<dependency>
<groupId>org.mongodb</groupId>
<artifactId>mongo-java-driver</artifactId>
<version>3.12.14</version>
</dependency>
</dependencies>
</project>package org.employee;
public class Employee {
private String id;
private String name;
private int age;
private String department;
private String email;
private double salary;
public Employee() {
}
public Employee(String name, int age, String department,
String email, double salary) {
this.name = name;
this.age = age;
this.department = department;
this.email = email;
this.salary = salary;
}
public Employee(String id, String name, int age,
String department, String email, double salary) {
this.id = id;
this.name = name;
this.age = age;
this.department = department;
this.email = email;
this.salary = salary;
}
public String getId() {
return id;
}
public String getName() {
return name;
}
public int getAge() {
return age;
}
public String getDepartment() {
return department;
}
public String getEmail() {
return email;
}
public double getSalary() {
return salary;
}
@Override
public String toString() {
return "Employee{" +
"id='" + id + '\'' +
", name='" + name + '\'' +
", age=" + age +
", department='" + department + '\'' +
", email='" + email + '\'' +
", salary=" + salary +
'}';
}
}package org.employee;
import com.mongodb.client.MongoCollection;
import com.mongodb.client.MongoDatabase;
import org.bson.Document;
import org.bson.types.ObjectId;
import java.util.ArrayList;
import java.util.List;
import static com.mongodb.client.model.Filters.eq;
public class EmployeeDAO {
private final MongoCollection<Document> collection;
public EmployeeDAO() {
MongoDatabase database =
MongoDBConnection.getDatabase();
collection = database.getCollection("employees");
}
// CREATE
public String createEmployee(Employee employee) {
Document document = new Document()
.append("name", employee.getName())
.append("age", employee.getAge())
.append("department", employee.getDepartment())
.append("email", employee.getEmail())
.append("salary", employee.getSalary());
collection.insertOne(document);
return document.getObjectId("_id").toHexString();
}
// READ ALL
public List<Employee> getAllEmployees() {
List<Employee> employees = new ArrayList<>();
for (Document document : collection.find()) {
Employee employee =
convertDocumentToEmployee(document);
employees.add(employee);
}
return employees;
}
// READ BY ID
public Employee getEmployeeById(String id) {
Document document = collection.find(
eq("_id", new ObjectId(id))
).first();
if (document == null) {
return null;
}
return convertDocumentToEmployee(document);
}
// UPDATE
public boolean updateEmployee(String id, Employee employee) {
Document updateDocument = new Document()
.append("name", employee.getName())
.append("age", employee.getAge())
.append("department", employee.getDepartment())
.append("email", employee.getEmail())
.append("salary", employee.getSalary());
var result = collection.updateOne(
eq("_id", new ObjectId(id)),
new Document("$set", updateDocument)
);
return result.getModifiedCount() > 0;
}
// DELETE
public boolean deleteEmployee(String id) {
var result = collection.deleteOne(
eq("_id", new ObjectId(id))
);
return result.getDeletedCount() > 0;
}
// Convert Document to Employee
private Employee convertDocumentToEmployee(
Document document) {
return new Employee(
document.getObjectId("_id").toHexString(),
document.getString("name"),
document.getInteger("age"),
document.getString("department"),
document.getString("email"),
document.getDouble("salary")
);
}
}package org.employee;
import com.mongodb.client.MongoClient;
import com.mongodb.client.MongoClients;
import com.mongodb.client.MongoDatabase;
public class MongoDBConnection {
private static final String CONNECTION_STRING =
"mongodb://localhost:27017";
private static final String DATABASE_NAME =
"employeedb";
private static MongoClient mongoClient;
public static MongoDatabase getDatabase() {
if (mongoClient == null) {
mongoClient = MongoClients.create(CONNECTION_STRING);
}
return mongoClient.getDatabase(DATABASE_NAME);
}
public static void closeConnection() {
if (mongoClient != null) {
mongoClient.close();
mongoClient = null;
}
}
}package org.employee;
import java.util.List;
import java.util.Scanner;
public class EmployeeApplication {
private static final Scanner scanner =
new Scanner(System.in);
private static final EmployeeDAO employeeDAO =
new EmployeeDAO();
public static void main(String[] args) {
int choice;
do {
displayMenu();
System.out.print("Enter your choice: ");
choice = scanner.nextInt();
scanner.nextLine();
switch (choice) {
case 1:
createEmployee();
break;
case 2:
displayAllEmployees();
break;
case 3:
findEmployeeById();
break;
case 4:
updateEmployee();
break;
case 5:
deleteEmployee();
break;
case 6:
System.out.println(
"Exiting application..."
);
break;
default:
System.out.println(
"Invalid choice!"
);
}
} while (choice != 6);
MongoDBConnection.closeConnection();
scanner.close();
}
private static void displayMenu() {
System.out.println();
System.out.println("================================");
System.out.println(" EMPLOYEE MANAGEMENT SYSTEM");
System.out.println("================================");
System.out.println("1. Create Employee");
System.out.println("2. Display All Employees");
System.out.println("3. Find Employee By ID");
System.out.println("4. Update Employee");
System.out.println("5. Delete Employee");
System.out.println("6. Exit");
System.out.println("================================");
}
// CREATE
private static void createEmployee() {
System.out.println("\n--- Create Employee ---");
System.out.print("Name: ");
String name = scanner.nextLine();
System.out.print("Age: ");
int age = scanner.nextInt();
scanner.nextLine();
System.out.print("Department: ");
String department = scanner.nextLine();
System.out.print("Email: ");
String email = scanner.nextLine();
System.out.print("Salary: ");
double salary = scanner.nextDouble();
scanner.nextLine();
Employee employee = new Employee(
name, age, department, email, salary
);
String id = employeeDAO.createEmployee(employee);
System.out.println(
"Employee created successfully!"
);
System.out.println("Generated ID: " + id);
}
// READ ALL
private static void displayAllEmployees() {
System.out.println("\n--- All Employees ---");
List<Employee> employees =
employeeDAO.getAllEmployees();
if (employees.isEmpty()) {
System.out.println("No employees found.");
return;
}
for (Employee employee : employees) {
System.out.println(employee);
}
}
// READ BY ID
private static void findEmployeeById() {
System.out.println("\n--- Find Employee ---");
System.out.print("Enter Employee ID: ");
String id = scanner.nextLine();
try {
Employee employee =
employeeDAO.getEmployeeById(id);
if (employee != null) {
System.out.println(employee);
} else {
System.out.println("Employee not found.");
}
} catch (IllegalArgumentException e) {
System.out.println(
"Invalid MongoDB ObjectId."
);
}
}
// UPDATE
private static void updateEmployee() {
System.out.println("\n--- Update Employee ---");
System.out.print("Enter Employee ID: ");
String id = scanner.nextLine();
try {
Employee existing =
employeeDAO.getEmployeeById(id);
if (existing == null) {
System.out.println("Employee not found.");
return;
}
System.out.print("New Name: ");
String name = scanner.nextLine();
System.out.print("New Age: ");
int age = scanner.nextInt();
scanner.nextLine();
System.out.print("New Department: ");
String department = scanner.nextLine();
System.out.print("New Email: ");
String email = scanner.nextLine();
System.out.print("New Salary: ");
double salary = scanner.nextDouble();
scanner.nextLine();
Employee employee = new Employee(
name, age, department, email, salary
);
boolean updated =
employeeDAO.updateEmployee(id, employee);
if (updated) {
System.out.println(
"Employee updated successfully!"
);
} else {
System.out.println(
"Employee was not updated."
);
}
} catch (IllegalArgumentException e) {
System.out.println(
"Invalid MongoDB ObjectId."
);
}
}
// DELETE
private static void deleteEmployee() {
System.out.println("\n--- Delete Employee ---");
System.out.print("Enter Employee ID: ");
String id = scanner.nextLine();
try {
boolean deleted =
employeeDAO.deleteEmployee(id);
if (deleted) {
System.out.println(
"Employee deleted successfully!"
);
} else {
System.out.println(
"Employee not found."
);
}
} catch (IllegalArgumentException e) {
System.out.println(
"Invalid MongoDB ObjectId."
);
}
}
}Right click on the EmployeeApplication and Run the EmployeeApplication
Execution and Output:
"C:\Program Files\Java\jdk-17\bin\java.exe" "-javaagent:C:\Program Files\JetBrains\IntelliJ IDEA 2025.3.1\lib\idea_rt.jar=56536" -Dfile.encoding=UTF-8 -classpath C:\Users\dudek\OneDrive\Desktop\mongodb\target\classes;C:\Users\dudek\.m2\repository\org\mongodb\mongo-java-driver\3.12.14\mongo-java-driver-3.12.14.jar org.employee.EmployeeApplication
Aug 29, 2026 9:26:10 PM com.mongodb.diagnostics.logging.JULLogger log
INFO: Cluster created with settings {hosts=[localhost:27017], mode=SINGLE, requiredClusterType=UNKNOWN, serverSelectionTimeout='30000 ms', maxWaitQueueSize=500}
================================
EMPLOYEE MANAGEMENT SYSTEM
================================
1. Create Employee
2. Display All Employees
3. Find Employee By ID
4. Update Employee
5. Delete Employee
6. Exit
================================
Enter your choice: Aug 29, 2026 9:26:10 PM com.mongodb.diagnostics.logging.JULLogger log
INFO: Opened connection [connectionId{localValue:1, serverValue:3}] to localhost:27017
Aug 29, 2026 9:26:10 PM com.mongodb.diagnostics.logging.JULLogger log
INFO: Monitor thread successfully connected to server with description ServerDescription{address=localhost:27017, type=STANDALONE, state=CONNECTED, ok=true, version=ServerVersion{versionList=[7, 0, 5]}, minWireVersion=0, maxWireVersion=21, maxDocumentSize=16777216, logicalSessionTimeoutMinutes=30, roundTripTimeNanos=3272300}
1
--- Create Employee ---
Name: Lakshman
Age: 20
Department: Designer
Email: lakshman@gmail.com
Salary: 40,000
Aug 29, 2026 9:27:12 PM com.mongodb.diagnostics.logging.JULLogger log
INFO: Opened connection [connectionId{localValue:2, serverValue:4}] to localhost:27017
Employee created successfully!
Generated ID: 6a9301584ce8c26c01e066aa
================================
EMPLOYEE MANAGEMENT SYSTEM
================================
1. Create Employee
2. Display All Employees
3. Find Employee By ID
4. Update Employee
5. Delete Employee
6. Exit
================================
Enter your choice: 1
--- Create Employee ---
Name: Mahesh
Age: 29
Department: Product Manager
Email: mahesh@gmail.com
Salary: 35,000
Employee created successfully!
Generated ID: 6a93017b4ce8c26c01e066ab
================================
EMPLOYEE MANAGEMENT SYSTEM
================================
1. Create Employee
2. Display All Employees
3. Find Employee By ID
4. Update Employee
5. Delete Employee
6. Exit
================================
Enter your choice: 2
--- All Employees ---
Employee{id='6a9301584ce8c26c01e066aa', name='Lakshman', age=20, department='Designer', email='lakshman@gmail.com', salary=40000.0}
Employee{id='6a93017b4ce8c26c01e066ab', name='Mahesh', age=29, department='Product Manager', email='mahesh@gmail.com', salary=35000.0}
================================
EMPLOYEE MANAGEMENT SYSTEM
================================
1. Create Employee
2. Display All Employees
3. Find Employee By ID
4. Update Employee
5. Delete Employee
6. Exit
================================
Enter your choice: 3
--- Find Employee ---
Enter Employee ID: 6a9301584ce8c26c01e066aa
Employee{id='6a9301584ce8c26c01e066aa', name='Lakshman', age=20, department='Designer', email='lakshman@gmail.com', salary=40000.0}
================================
EMPLOYEE MANAGEMENT SYSTEM
================================
1. Create Employee
2. Display All Employees
3. Find Employee By ID
4. Update Employee
5. Delete Employee
6. Exit
================================
Enter your choice: 4
--- Update Employee ---
Enter Employee ID: 6a9301584ce8c26c01e066aa
New Name: Lakshmi Narayana
New Age: 32
New Department: IT
New Email: lakshman.12@gmail.com
New Salary: 60,000
Employee updated successfully!
================================
EMPLOYEE MANAGEMENT SYSTEM
================================
1. Create Employee
2. Display All Employees
3. Find Employee By ID
4. Update Employee
5. Delete Employee
6. Exit
================================
Enter your choice: 5
--- Delete Employee ---
Enter Employee ID: 6a93017b4ce8c26c01e066ab
Employee deleted successfully!
================================
EMPLOYEE MANAGEMENT SYSTEM
================================
1. Create Employee
2. Display All Employees
3. Find Employee By ID
4. Update Employee
5. Delete Employee
6. Exit
================================
Enter your choice: 6
Exiting application...
Process finished with exit code 0
Code language: PHP (php)