Introduction to Hibernate and ORM

• Hibernate is an Object-Relational Mapping (ORM) framework for mapping Java objects to relational database tables.
• ORM is a technique for mapping objects in an object-oriented programming language to relational databases.

Why Use Hibernate?

• Open-source framework
• Provides a high-level API for common database operations
• Supports lazy loading, making it more efficient than other ORM frameworks
• Supports a wide range of database systems

How Hibernate Works

• Mapping between Java objects and database tables defined in Hibernate configuration file
• Hibernate framework uses configuration file to generate SQL queries
• Uses object-relational mapping (ORM) to map Java objects to database tables
• Allows developers to work with Java objects as if interacting directly with the database, without writing complex SQL queries

Hibernate Architecture

Conclusion

• Hibernate is a powerful ORM framework for building Java applications that interact with databases
• Provides a high-level API and supports a wide range of database systems
• Open-source license makes it a great option for developers.

Table – Java : Hibernate : sql datatypes mapping

comparison of the data types for Java, Hibernate, and SQL:

Java Data Type	Hibernate Data Type	SQL Data Type
boolean	boolean	BOOLEAN
byte	byte	TINYINT
char	character	CHAR
short	short	SMALLINT
int	integer	INT
long	long	BIGINT
float	float	FLOAT
double	double	DOUBLE
String	string	VARCHAR
Date	date	DATE
Timestamp	timestamp	TIMESTAMP
BigDecimal	big_decimal	DECIMAL