Spring Data JPA Entity mappings | One-to-One | One-to-Many | Many-to-One | Many-to-Many mappings

You will learn Spring Data JPA Entity map unidirectional and bidirectional association mappings.
Unidirectional One-to-One Association
Bidirectional One-to-One Association
Unidirectional One-to-Many Association
Unidirectional Many-to-One Association
Bidirectional Many-to-One Association
Unidirectional Many-to-Many Association
Bidirectional Many-to-Many Association
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[@iuriirudov]

Thank you for this video and explanation of the mappings. It is by far the best for me to understand with code example. Quick and easy, not boring at all, right to the point.

[@repakanagesh7615]

Great! thanks for covering all in single video

[@antorodrigo2084]

Really useful to understand the entity annotations. Thanks!

[@simondif1470]

Regarding many-to-many, normally you would like to reuse the item rows when several customers share a same item. Thus the cascade type should not be ALL. Otherwise when you remove a customer, all its items will be removed as well, which makes sense in the case of one-to-many but not many-to-many (and many-to-one).

[@atiqurrahman7260]

finally some decent explanation.
Thanks

[@Trazynn]

Don't worry man. Subscribed. Keep going. There's very little about entity mappings on TH-cam.

[@himanshubhusanrath212]

Thank you so much for this video. The concepts are explained in a very detailed manner. This helped me a lot. May God bless you !

[@magadiflo-dev]

Excellent. Thanks for sharing your knowledge. Greetings from Perú.

[@gulbalasalamov1367]

Many thanks!
All type of relations worked for me

[@christopherami8142]

Thanks mate ! i need this video

[@rahuldeulgaonkar]

Thank you. Very nice explanation.

[@raheemsk3552]

Nice explanation bro.... thank you

[@moggarajesh5240]

Nice explanation...and thank you so much

[@patrykruryk3532]

Good job man!

[@priyankjoshi3018]

Nice and very well explained.

[@bisamallaajaykumar4255]

Thanks a lot very clear :)

[@nileshshinde6718]

Great explanation... Thank you

[@abhilashbhise2743]

Thank You So Much

[@chetanbhandari3033]

Thanks nice explanations

[@manjunathmaruthi233]

Hi, thanks for the video, would you mind explaining when to go with unidirectional, bidirectional & Join table

[@technotowntechie9732]

Unidirectional Relationships:-
1. Unidirectional is a relation where one side does not know about the relation.
2. In a unidirectional relationship, only one entity has a relationship field or property that refers to the other. For example, Line Item would have a relationship field that identifies Product, but Product would not have a relationship field or property for Line Item. In other words, Line Item knows about Product, but Product doesn’t know which Line Item instances refer to it.
Bidirectional Relationships:-
1. Bidirectional relationship provides navigational access in both directions, so that you can access the other side without explicit queries.
2. In a bidirectional relationship, each entity has a relationship field or property that refers to the other entity. Through the relationship field or property, an entity class’s code can access its related object. If an entity has a related field, the entity is said to “know” about its related object. For example, if Order knows what Line Item instances it has and if Line Item knows what Order it belongs to, they have a bidirectional relationship.

[@RN-jo8zt]

@@technotowntechie9732 can you please explain littel bit more about point1.
just confused about --> other side without explicit queries.

[@younesszgr3162]

bro , you rock !

[@officialmiracleofdoll]

How to update foreign key with new primary key ??? My query is
"update Card o Set o.customer.userName=:newuserName where o.customer.userName=:userName";

[@piumasan1983]

Great video! One question: why do you change from List to Set?

[@pounkumarj1916]

avoid to duplicate data 's

[@dllm3tommy741]

Thanks for the video

[@shivanshutyagi83]

Helpful

[@ravikumarmn2564]

2 schemes created in myself?

[@pounkumarj1916]

clear cut explanation,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,...............................................

[@singarajusreedhar]

for aan example of bidirectional one t one when the get all is called on referencing entity it goes in infinte loop, not sure you face same issue

[@achyutgawade7948]

Great explanation! But the video's sound is very poor, barely able to hear the voice on the laptop.

[@technotowntechie9732]

Sorry about that Achyut.

[@arunkumar-ci8nb]

Yes vidio content is great ..but please improve the sounding....cheers✌

[@pasupulaphaneesh4049]

Explanation is too fast. All the relationships are explained in one video in short time and couldn't able to understand. Appreciate if you can do one each relational mapping with example and showing DB changes along with the code.

[@SuperSenthil8]

Seems like running fastly to cover the topics, if you do in slow way it will be easily understandable to all

[@anindyapaul2239]

upgrade ur micrphne.... thats y indian utubers r nt gettng any lights...

[@technotowntechie9732]

Sure, Thank You

[@thejas6922]

boooring explanatioon

[@technotowntechie9732]

Thanks 😊

[@anonboy863]

Very boring

[@technotowntechie9732]

Thank You

[@arikarans1302]

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