Static Concept in Java -

1. Static Block: It always execute before main method.
This is particularly useful for performing initialization tasks that need to be done only once, such as establishing connections.

2. Static Class: Outer class never static…

Hibernate SignUp | SignIn

GitHub- https://github.com/fullstackjavadeveloperpune/hibernatesignupsigin

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Spring Boot with JWT-
JWT- JSON Web Token- JSON Web Token (JWT) is an open standard (RFC 7519) that defines a compact and self-contained way for securely transmitting information between parties as a JSON object. This information can be verified and trusted…

@Transient Annotation in Hibernate
What is @Transient in Hibernate?
@Transient annotation is used to indicate that a field should not be persisted
in the database.
Hibernate will ignore this field chrowhen performing any save, or update operations.

✅Real…

Full Stack Application SignUp | SignIn | Java Spring Boot + React JS + MySQL

Tech Stack-
✅ Backend – Java 17, Spring Boot, Spring Data JPA
✅ Frontend – React JS
✅ Database – MySQL
✅ API Communication – Axios
✅ Version Control – GitHub

React JS-
✅ Create…

Session.get() vs Session.load() in Hibernate
In Hibernate, both session.get() and session.load() are used to fetch data from the database
using the primary key.
session.get()-
Returns null if the object is not found.
Useful when you need to check whether…

SQL- Structured Query Language
RDBMS stands for Relational Database Management System.

Modern database systems such as MySQL, PostgreSQL, SQL Server, Oracle, etc.
The data in RDBMS is stored in database objects called tables. A table is a collection of related…

Keys in SQL: Primary Key, Unique Key, and Foreign Key
1. Primary Key -
Primary Key is a column in a table that uniquely identifies each row in that table.

Characteristics:
Ensures uniqueness – No two rows can have the same value in the primary key column.…

Hibernate Association Mapping-
One to One Mapping
One Employee has one Address.
Each Address is linked to exactly one Employee.

Notes
This is a unidirectional One-to-One (Employee → Address).
You can make it bidirectional by adding a mapped field in Address:…

Airline Reservation | Spring Boot + React JS Full Stack Project
Tech Stack- Full Stack[JDK 17, Spring Boot 3+, React JS]
Back End- Java, JDK 17, Data JPA, Spring Boot, Spring Security- JWT
Front End- React JS
Database- MySQL
API Testing- Postman API, Swagger…

JDBC- Java Database Connectivity

Steps for JDBC
1. Load Driver Class
2. Establish Database Connection
3. Create Statement
4. Execute Query
5. Close Database Connection

#GitHub URL- https://github.com/fullstackjavadeveloperpune/jdbcex

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Joins in SQL-
Joins in SQL are used to retrieve data from multiple tables based on a related column between them.

1. INNER JOIN
Returns only the matching rows from both tables.
If there is no match, the rows are excluded.

2. LEFT OUTER JOIN (LEFT JOIN)…

Hibernate One to Many Mapping
Employee[1]- Address[*]

table-
1. Employee
2. Address
3. Employee_Address

GitHub- https://github.com/fullstackjavadeveloperpune/hibernateonetomanymapping

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Aggregate Functions in SQL-
Aggregate functions in SQL perform calculations on a set of values and return a single value. They are commonly used with the GROUP BY clause to perform operations on grouped data.

There are 5 Aggregate Functions in SQL- MIN…

JDBC- Java Database Connectivity

CRUD:
C- Create
R- Read
U- Update
D- Delete

-------------------------------------------------------
Functionality-
1. Create Database
2. Craete Table
3. Insert Data
4. Read Data
5. Update Data
6. Delete By Id
7. Delete All…

Hibernate Many-to-One mapping
@ManyToOne(cascade = CascadeType.ALL)
@JoinColumn(name = "address_id") // Foreign key column
private Address address;

cascade = CascadeType.ALL in @ManyToOne ensures that the Address will be saved/updated when saving Employee.…

J2EE- Servlet Hello World
A Servlet is a Java program(Web Application) that runs on a web server and handles HTTP requests and responses. It is a key component of Java EE used to create dynamic web applications.

Servlet Lifecycle

Initialization (init()):…

SQL- Structured Query Language
RDBMS stands for Relational Database Management System.

Modern database systems such as MySQL, PostgreSQL, SQL Server, Oracle, etc.
The data in RDBMS is stored in database objects called tables. A table is a collection of related…

Hibernate Named Queries-
Named Queries in Hibernate are predefined, reusable queries written in HQL

Advantages of Named Queries
Precompiled – Compiled once during application startup.
Reusable – Defined once and used many times.
Maintainable – Easy to manage…

Hibernate Many-to-Many mapping
Employee[*]- Address[*]

GitHub- https://github.com/fullstackjavadeveloperpune/hibernatemanytomanymapping

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