Category Archives: Без рубрики

You open a Hibernate session by calling openSession() on a SessionFactory instance. The session represents a single unit of work and serves as the main interface for CRUD operations, queries, and transaction management. 🔹 What happens when you open a … Continue reading →

A Hibernate Dialect is a class in Hibernate that encapsulates the SQL variations, syntax rules, and database-specific behaviors for a particular relational database (RDBMS). 🔹 What it does: Translates Hibernate’s abstract SQL into database-specific SQL. Knows the SQL features and … Continue reading →

You specify the database dialect in Hibernate using the hibernate.dialect property. This tells Hibernate which SQL dialect to use so it can generate database-specific SQL statements compatible with your database system (e.g., MySQL, PostgreSQL, Oracle). 🔹 Why is dialect important? … Continue reading →

hibernate.properties is an alternative configuration file for Hibernate where you can specify key-value pairs of Hibernate settings, like database connection details and other properties — similar to what you’d define in hibernate.cfg.xml, but in a simpler .properties format. 🔹 What … Continue reading →

Yes — Hibernate (and JPA) support annotations as a modern alternative to XML mapping files. You can map your entities, primary keys, relationships, and other metadata directly in your Java classes using standard JPA or Hibernate-specific annotations. 🔹 Key annotations … Continue reading →

hibernate.cfg.xml is Hibernate’s central configuration file, traditionally used to define settings required for Hibernate to connect to the database and set up its behavior. It’s an XML file placed in your project’s classpath (usually in src/main/resources), and it’s used when … Continue reading →

✅ How do you enable second-level caching in Hibernate? Answer:Second-level cache is optional in Hibernate — to enable it, you need to: 🔹 1️⃣ Enable second-level cache globallyAdd this property in your Hibernate configuration (e.g., hibernate.cfg.xml, application.properties, or application.yml): 🔹 … Continue reading →

✅ How does the first-level cache work by default in Hibernate? Answer:The first-level cache is Hibernate’s mandatory, built-in mechanism for tracking entities within a single Session. Here’s exactly how it works by default: 🔹 Always enabled First-level cache is always … Continue reading →

✅ Is the query cache an example of second-level cache? Answer:🔹 The query cache itself is not the same thing as the second-level cache, but it depends on the second-level cache to work effectively. The query cache caches query result … Continue reading →

✅ What’s the difference between query cache and first-level cache in Hibernate? 🔹 First-Level Cache✅ Scope: Limited to a single Hibernate Session.✅ Enabled: Always on — cannot be disabled.✅ Purpose: Caches individual entity instances you load, save, or update in … Continue reading →