. Hibernate Basics & Core Concepts
- What is Hibernate? Why is it used?
- ORM (Object-Relational Mapping) vs JDBC
- JPA vs Hibernate (Specification vs Implementation)
- Hibernate Architecture & Components
SessionFactory, Session, Transaction, Query, Criteria- First-Level Cache & Second-Level Cache
- Hibernate Lifecycle & States of an Entity (
Transient, Persistent, Detached, Removed)
- save, persist, merge and update difference
2. Hibernate Configuration
- Configuring Hibernate with
hibernate.cfg.xml and persistence.xml
- Hibernate Properties (
hibernate.dialect, hibernate.show_sql, etc.)
- Difference between
persistence.xml and hibernate.cfg.xml
- Programmatic Configuration (without XML)
3. Entity Mapping & Annotations
- Basic Annotations:
@Entity, @Table, @Column, @Id, @GeneratedValue
- Primary Key Strategies:
AUTO, IDENTITY, SEQUENCE, TABLE
- Column Constraints:
@UniqueConstraint, @NotNull, @Size, @Column(nullable = false)
- Attribute Overrides (
@AttributeOverride, @AttributeOverrides)
- Enumerations & Converters (
@Enumerated, AttributeConverter)