What are the main advantages of using Hibernate compared to direct JDBC usage?

Hibernate provides several key advantages over direct use of JDBC:

• Database abstraction: Hibernate hides low-level SQL and JDBC details, allowing work with Java objects instead of tables and rows.

• Automatic session and transaction management: Hibernate simplifies working with transactions and sessions, reducing errors.

• Caching: Hibernate supports first and second level cache, improving performance by reducing database queries.

• HQL and Criteria API support: Enables writing queries in an object-oriented query language, which is more convenient and safer than string concatenation of SQL.

• Object-to-table mapping: Easily describes relationships between objects (one-to-one, one-to-many, etc.) and manages them automatically.

• Portability: Hibernate supports many DBMSs, making it easier to switch databases without changing code.

In summary, Hibernate reduces boilerplate code, improves readability and maintainability, and helps avoid many JDBC-related errors.