JPA/Hibernate Fundamentals 2023 - Lesson 15 - Entity Graphs

[@flaca7342]

Thank you Laur, it was a wonderful session. Really you' re a genious and the way you teach is so clear...

[@laurspilca]

Happy you find these helpful.

[@hamzaaitoumghar9359]

why did you change List to Set in association mapping ?

[@flaca7342]

may be because he don't want duplicates of books or bookshops... just a thought.

[@laurspilca]

@@flaca7342 Actually an excellent question! Because lists may have duplicates if you try to apply the subgraph it will face problems. I should have told this actually in the event but I forgot. This is to avoid a so called "cannot get simultaneous fetch multiple bags?

[@Omar-m1k]

Hi laure , honestly you are the best teacher teaching me spring boot and java as well , can you just do a playlist about asynchronous messaging cuz i want to build a chat application , thank you very well best teacher ☺

[@laurspilca]

Thank you!

[@zaidrj7374]

Thanks

[@chriswong2748]

Do you have any recommended books for deep dive into hibernate and jpa?

[@laurspilca]

Hello. To be honest, this is the only book I really liked on the topic: Pro JPA 2 in Java EE 8: An In-Depth Guide to Java Persistence APIs By Mike Keith, Merrick Schincariol, Massimo Nardone A bit old now but I still think it covers well the basics.

[@OsteenOmega]

Hello sir, i'm building a very simple ecommerce store, and i want to incoporate different payment gateways. should i create a different entity for each ? or what can we do to reduce to the repetition?

[@laurspilca]

Hi. I don't think there a best answer to your question. I think it depends a lot on the solutions you integrate. I don't know how to answer that since it's pretty much a specific case.

[@account_s23fe]

Just a request, if you make the ide theme dark, it would easy on eyes for the night viewers 😊

[@laurspilca]

Hello. Thanks. Unfortunately some want it to be white and others black. I need to make a choice and either will make everyone happy.

[@user.chuyin]

For the last part (NamedEntityGraph - subgraph), it should be like this? @NamedEntityGraphs( value = { @NamedEntityGraph( name="Author.book.graph", attributeNodes={@NamedAttributeNode(value = "booksList", subgraph = "booksListSubGraph")}, subgraphs={@NamedSubgraph( name = "booksListSubGraph", type=Book.class, attributeNodes = {@NamedAttributeNode("bookShopList")})} ), } )