Hibernate Demo Application

A simple Java application demonstrating Hibernate usage with PostgreSQL database.

Prerequisites

• Java 21
• PostgreSQL (running on port 2284)
• Gradle (or use the included Gradle wrapper)

Database Setup

1. Create database schema:

CREATE SCHEMA demo;

2. Create the users table:

CREATE TABLE demo.users (
    id BIGSERIAL PRIMARY KEY,
    first_name VARCHAR(255) NOT NULL,
    last_name VARCHAR(255) NOT NULL,
    email VARCHAR(255) NOT NULL UNIQUE,
    CONSTRAINT users_email_key UNIQUE (email)
);

Configuration

1. Create a set-env.bat file with your database credentials:

set DB_USERNAME=your_username
set DB_PASSWORD=your_password

2. Run the environment setup:

set-env.bat

Building the Application

Using Gradle wrapper:

gradlew.bat clean build

Running the Application

gradlew.bat run

Features

• User entity management with Hibernate
• Demonstrates both efficient and inefficient database querying methods
• Email uniqueness validation
• Proper transaction management
• Configurable logging levels

Project Structure

src/
├── main/
│   ├── java/
│   │   └── com/
│   │       └── castsoftware/
│   │           ├── Main.java
│   │           └── entity/
│   │               └── User.java
│   └── resources/
│       ├── hibernate.cfg.xml
│       ├── hibernate.properties
│       └── logback.xml