Скачать или смотреть Spring Data JPA Mapping In One Shot | Cascading and Fetch types | N+1 Query Optimisation (Hindi)

In this video, we explore JPA entity relationships with real‑world examples (Hospital Management System) —covering one‑to‑one, one‑to‑many, many‑to‑many mappings, bi‑directional associations, cascading, orphanRemoval, and fetch strategies (EAGER vs LAZY).

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What You’ll Learn:
Defining @OneToOne, @OneToMany, @ManyToMany associations
Setting up bi‑directional relationships and choosing owning/inverse sides
Leveraging cascading and orphan removal for entity operations
Understanding FetchType strategies and preventing N+1 queries
Using JPA Buddy to accelerate repository development

0:00 Introduction
1:21 Project Overview with ER Diagram
2:48 Patient-Insurance One-to-One Mapping
12:48 Bi-directional Mapping
14:00 Inverse side and owning side
16:40 Patient-Appointment One-to-Many Mapping
24:02 Doctor-Appointment One-to-Many Mapping
27:30 Doctor-Department Many-to-Many Mapping
42:55 JPA Buddy to generate Repository
45:15 Assign Insurance to Patient operation
48:48 Cascading in JPA Mapping
1:04:20 Create Appointment for Patient
1:19:14 Re-assign Appointment (Cascading example)
1:26:04 orphanRemoval and REMOVE Cascading
1:36:05 FetchType EAGER and LAZY and Left Join
1:39:00 N+1 Query Optimization


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