Implemented a DatabaseHandler class

Author: RealMangorage

build.gradle

@@ -90,6 +90,15 @@ dependencies {
             strictly("26.0.2")
         }
     }
+
+    // SQL Stuff
+    library("org.hibernate.orm:hibernate-core:6.4.4.Final")
+    library("jakarta.persistence:jakarta.persistence-api:3.1.0")
+    library("jakarta.interceptor:jakarta.interceptor-api:2.1.0")
+    library('jakarta.enterprise:jakarta.enterprise.cdi-api:4.0.1')
+
+    // SQL Driver
+    library("com.mysql:mysql-connector-j:8.4.0")
 }
 
 tasks.named('processResources', ProcessResources).configure {

src/main/java/module-info.java

@@ -17,6 +17,7 @@
     requires static org.spongepowered.mixin;
 
     requires com.google.gson;
+    requires org.hibernate.orm.core;
 
     // Config API
     exports org.mangorage.mangobotcore.api.config.v1;

src/main/java/org/mangorage/mangobotcore/api/util/data/DatabaseHandler.java

@@ -0,0 +1,78 @@
+package org.mangorage.mangobotcore.api.util.data;
+
+import org.hibernate.Session;
+import org.hibernate.SessionFactory;
+import org.hibernate.Transaction;
+import org.hibernate.cfg.Configuration;
+
+import java.util.List;
+
+public final class DatabaseHandler<ID, T extends IUniqueIdHolder<ID>> {
+
+    // Static factory method to create a DatabaseHandler instance
+    public static <ID, T extends IUniqueIdHolder<ID>> DatabaseHandler<ID, T> create(String url, String user, String pass, Class<T> entityType) {
+        return new DatabaseHandler<>(url, user, pass, entityType);
+    }
+
+    private final SessionFactory sessionFactory;
+    private final Class<T> entityType;
+
+    DatabaseHandler(String url, String user, String pass, Class<T> entityType) {
+        this.entityType = entityType;
+
+        this.sessionFactory = new Configuration()
+                .setProperty("hibernate.connection.url", url)
+                .setProperty("hibernate.connection.username", user)
+                .setProperty("hibernate.connection.password", pass)
+                .setProperty("hibernate.connection.driver_class", "com.mysql.cj.jdbc.Driver")
+                .setProperty("hibernate.dialect", "org.hibernate.dialect.MySQLDialect")
+                .setProperty("hibernate.hbm2ddl.auto", "update")
+                .setProperty("hibernate.show_sql", "false")
+                .addAnnotatedClass(entityType)
+                .buildSessionFactory();
+    }
+
+    public void migrateToDatabase(List<T> fileEntities) {
+        if (fileEntities.isEmpty()) return;
+
+        try (Session session = sessionFactory.openSession()) {
+            Transaction tx = session.beginTransaction();
+
+            for (T entity : fileEntities) {
+                session.merge(entity);
+            }
+
+            tx.commit();
+        }
+    }
+
+    public List<T> loadEntitiesFromDatabase() {
+        try (Session session = sessionFactory.openSession()) {
+            return session.createQuery("from " + entityType.getName(), entityType).list();
+        }
+    }
+
+    public void saveEntity(T entity) {
+        try (Session session = sessionFactory.openSession()) {
+            Transaction tx = session.beginTransaction();
+            session.merge(entity);
+            tx.commit();
+        }
+    }
+
+    public void removeEntity(T entity) {
+        try (Session session = sessionFactory.openSession()) {
+            Transaction tx = session.beginTransaction();
+            session.createMutationQuery("delete from " + entityType.getName() + " where id = :id")
+                    .setParameter("id", entity.getId())
+                    .executeUpdate();
+            tx.commit();
+        }
+    }
+
+    public void close() {
+        if (sessionFactory != null) {
+            sessionFactory.close();
+        }
+    }
+}

src/main/java/org/mangorage/mangobotcore/api/util/data/IUniqueIdHolder.java

@@ -0,0 +1,5 @@
+package org.mangorage.mangobotcore.api.util.data;
+
+public interface IUniqueIdHolder<T> {
+    T getId();
+}