JPA / Hibernate One to Many Mapping Example with Spring Boot
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- čas přidán 24. 07. 2024
- In this tutorial, we will learn how to define a one-to-many unidirectional mapping between two entities using JPA and Hibernate.
Source code on my GitHub repository at github.com/RameshMF/spring-bo...
We create a Spring boot project from the scratch and we will implement the one-to-many mapping between two entities using JPA and Hibernate. We will use a MySQL database to store and retrieve the data.
The one-to-many mapping means that one row in a table is mapped to multiple rows in another table.
Read the same blog post and get the source code at www.javaguides.net/2020/04/jp....
JPA / Hibernate One to One Mapping Example with Spring Boot at • JPA / Hibernate One to...
JPA / Hibernate Many to Many Mapping Example with Spring Boot at • JPA / Hibernate Many t...
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JPA / Hibernate One to One Mapping Example with Spring Boot at czcams.com/video/kAYjrhcrx_8/video.html
JPA / Hibernate Many to Many Mapping Example with Spring Boot at czcams.com/video/-q9rp2pzvGU/video.html
Can we have video for bidirectional one to many mapping?
thanks alot✨you help me alot
Thanks 💚
thank you
Really good
thnx bro
Super
Good video 🤘
Actually i want this code input from html page ,when i insert 5 records with html page they will save with their individual id and one same id for 5 records guide me with user input from web...
Struggled for hours and finally followed this tutorial and fixed my issue in 5 mins.
Awesome tutorial. Thanks a ton for doing this!
This is such a great tutorial! I was really struggling with a project, but this video helped me simplify my code so much. Thanks again :)
Thank u , this video help me alot
Thankyou was helpful!
Thank you sir.
Best youtube channel for spring boot learning, I'm improving fast, thank you!
It's perfect and working
To the point information. Very useful from beginners to intermediate.
Simple explanation and example that helps to understand heads-to-toe information.
wow! thaks! I'm Korean. Your this video is very useful me! thank you.
Superb clear and simple instructions. Thank you sir 👍
Thank for good explanation sir, this is valuable
Great explanation! Keep up the amazing work!
Really nice sir great thanks for such a tutorial
I know this video is 2 years old but it was still very heplful!
omg dude thank you so much, the best java channel on yt
Beautiful explanation brother
Thank you so much. It helped me a lot. Glad to subscribe to your channel bro :)
Bro how to perform remaining crud operations
Excellent content, you can make a video, where you have tables with various relationships and teach how to map them in classes, I just have a problem like that.
Yes. I will plan to create a video tutorial which will cover all the mappings.
Nice tutorial. I wish the systems would provide them as well
Thanks for the video but I am still getting integrity constraint violated- parent key not found . Could you please help .
Please show show to.fetch the data, fetching is more difficult that saving updating and deleting because of multiple queries it execute, iwant to show how to efficiently fetch the datas with using minimal code and/or queries.
Great video @java guides,
I need to update 3 levels a customer his child (product) and his granchild (promotion) how can I save those 3 entities ad once?
Can we take some other column as referencedColumn rather than primary key
Great
Thanks for the video but I am need to know how can i implemint this mapping in my front end in angular
Referencedcolumn=I'd I'd belongs to comments right?
How can you find all comments based on post_id?
Спасибо динеш)!
How do you update comments with new one or delete one
i have a diagram of Class i want know how i make it with jpa/hibernate(spring boot)
Good show! make same thing with API please
I have a question, what happens if you use the findAll() for Post it will bring you the comments?, I have this exact mapping and I can get the post a comment is in, but I can get the comments on a post, the collection always return null
Hi, If passible add thymeleaf + JPA / Hibernate One to Many Mapping Example with Spring Boot, like your example have one post to many comments with frontend
This example is not working in my spring boot rest controller
What is the error?
@@JavaGuides I will share the exact error. If I do only one to many its working but if I do bidirectional mapping JSON issues like
Infinite loop recursion
Stack Overflow issue
@@JavaGuides Can you show me one to many bidirectional mapping in spring boot rest controller
Bro, if i want to have 3 Entites relationed but i don´t want to delete the realationed tables.I explain myself better: i have a Entity called Screen that can have multiples list of reproduction, but if user wants to delete a Screen, i don´t want to delete lists of reproduction too, cuz it doesn´t have sense,they are totally independent(Screen and Lists of reproduction).I understand One Screen can have multiple lists of reproduction, but i don´t want the cascade,use can save a screen whenever they want and later save the list of reproduction,what cascade type is that?
I suggest read this article at vladmihalcea.com/a-beginners-guide-to-jpa-and-hibernate-cascade-types/
Would you recommend unidirectional or bidirectional mapping
It's based on the business use case and requirement. I suggest to understand both unidirectional and bidirectional mappings so that it will very easy to get real-time use cases and scenarios.
Is one to many and one to one bidirectional mapping can be there?
When I'm deleting or updating the data it is deleting from the parent table but not from the child table!!!! How to resolve this?
Check cascadetype on parent class
@@JavaGuides I did but it's not working!! Do we need to perform bi-directional mapping?
@@jyotikinkarsahariacse17vel2 at 9:20, I have explained about cascade type and this should work. If you delete Post then along with post, it's comments should delete.
Try one more solution, add orphanRemoval = true attribute to one to many annotation.
stackoverflow.com/questions/2011519/jpa-onetomany-not-deleting-child
Is this helped you?
@@JavaGuides I'll try
Use lombok bro.. you will save lot of time.
Good point but I do use Lombok in big projects. Using Lombok in simple example or project does not make sense and also beginners were confuse with Lombok so I don't prefer using Lombok in simple projects.
@@JavaGuides makes sense, BTW very good video mate. Thank You.
Nice video, But... where the are the remaining crud operations
1. updating the existing comment for a post
2. delete the comment from a existing post
3.save a new comments to existing post
you simply can use PostRepository in your commandLineRunner implementation method run().
Thoda slow kro ki pta chle itna jaldi me kyu ho aap??