Step 1-Introduction to Hibernate and ORM (Object-Relational Mapping)

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

5

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 TypeHibernate Data TypeSQL Data Type
booleanbooleanBOOLEAN
bytebyteTINYINT
charcharacterCHAR
shortshortSMALLINT
intintegerINT
longlongBIGINT
floatfloatFLOAT
doubledoubleDOUBLE
StringstringVARCHAR
DatedateDATE
TimestamptimestampTIMESTAMP
BigDecimalbig_decimalDECIMAL