Summary

In this chapter, we looked at the following:

• How to represent the data using Kotlin data classes
• A brief introduction to JPA and its architecture
• How to map relations between the entities using JPA's @OneToOne, @OneToMany, @ManyToOne, and @ManyToMany annotations
• How we can retrieve data from a database using Queries
• How to define the data source
• Transaction management in JPA using entityManager
• Handling exceptions in JPA
• A simple JPA project to demonstrate the database operations