#17 Hibernate Tutorial in Hindi | One-to-Many & Many-to-One Mapping | mappedBy, JoinTable, FetchType

Welcome back to CodeHunt’s Hibernate–JPA Tutorial Series!
In this session, we continue Hibernate Mapping – Part 2, where we cover two of the most widely used relationships in real-world applications:
One-to-Many and Many-to-One Mapping.

This video explains everything clearly with diagrams, database flow, and practical code examples so you understand how Hibernate manages parent–child relationships internally.

🎯 What You’ll Learn in This Video

✅ 1. One-to-Many Mapping

What is One-to-Many relationship?
How parent holds a list of child records
How Hibernate creates the foreign key table

✅ 2. Many-to-One Mapping

How foreign key is maintained in Many-to-One
Code explanation with table structure
Complete clarity with diagrams

✅ 3. mappedBy Explained

What is mappedBy?
Why mappedBy is used only on the non-owning side
How it prevents duplicate foreign keys
One-to-Many (mappedBy) vs Many-to-One (owning side)

Owning side = The side which contains the foreign key

✅ 4. FetchType: LAZY vs EAGER

Default fetch type for One-to-Many and Many-to-One
Why One-to-Many is always LAZY
Why Many-to-One is EAGER by default

🧠 By the End of This Session, You Will Clearly Understand:

Difference between One-to-Many and Many-to-One
Which side owns the relationship
How mappedBy prevents extra foreign keys & join tables
How cascading and fetch types work with collections
How to design parent–child entities in Hibernate
Interview-level clarity for relationship mapping

👨‍💻 Perfect For:
Students | Java Developers | Hibernate Beginners | Backend Engineers | JPA Learners | Interview Preparation

📩 Contact for Enrollment:
📞 Call / WhatsApp: 8088467640

📌 Watch the Hibernate 2.0 Series Here:
👉 🔗 https://www.youtube.com/playlist?list=PL0P9REiGk_zabcoLlZd3bmuj5VyhM4v6Q

#java #hibernate #springboot #codehunt #saifsir #jpatutorial #javamapping #onetomany #manytoone #mappedby #fetchtype #hibernateinterview #backenddevelopment

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