Hibernate & JPA Tutorial - Crash Course
ฝัง
- เผยแพร่เมื่อ 3 ก.ค. 2024
- Ever looked for a comprehensive tutorial to Hibernate & JPA that is fun and entertaining at the same time?
This video is a crash course into the Hibernate & JPA universe. We'll start with getting the correct project dependencies, annotating our classes with JPA annotations and setting up a SessionFactory. This allows us to execute basic CRUD operations, HQL and Criteria queries. Afterwards we can simply JPAify our code, switching out a couple of classes and you'll understand how Hibernate / JPA & Spring Boot play together. By the end of it, you'll have a good (initial) understanding of how to use it and what your future Hibernate / JPA learning journey entails.
► Source Repository
github.com/marcobehlerjetbrai...
► Timestamps
00:00 Intro - What you need to know about Hibernate
00:39 What problem does it solve
01:51 Project Dependencies
02:41 Mapping Annotations
05:53 SessionFactory
08:17 Save / Update / Delete - Basic CRUD
10:33 HQL Queries
13:33 JPA
17:37 Criteria API
22:22 Hibernate /JPA & Spring Boot
24:11 Outro - What to learn next
► FOLLOW ME
/ marcobehler
www.marcobehler.com - วิทยาศาสตร์และเทคโนโลยี
You should've already had thousands of views! WTF?
If you can have a chat with the TH-cam algorithm, I would appreciate it ;)
@@MarcoCodes Thank you for the great content! I purchased your Spring course and I loved it! Unfortunately, I'm unable to buy a Maven one, as Russia got locked out from the whole world and Visa/Mastercard no longer work. No Marco, no Udemy, no Coursera😭 Hope pointless war ends soon...
Thanks for the feedback, really great to hear! Yes, let's hope this pointless war ends soon, absolutely.
@@equilibrium6577 Thank you! I just found out that Marco sells courses with your message!
@@Jod4light they are gooood!
So grateful that I found your channel. Amazing video, clear & concise !
Excellent intro to JPA and Hibernate, thanks this was awesome.
Other tutors should come and learn from you b'cos you made this concept soo simple to understand. Thank you a lot
I found your video by searching “hibernate crash course” and it was great! Just what I was looking for, especially the sections on JPA and Spring. Thanks!
best thing about this video is that it puts the knowledge into context of other apis and frameworks, so now I know where and what to look for if I need extra information.
Extremely clear and great explanation, thank you!
This video is head & shoulders above the other Hibernate tutorials out there. Great job Marco!
Thank you, Marco, this crash course is awesome. And I'm about to become a student of your Confident Spring Pro course. It's really helpful.
This is really helpful. With good examples and best practices. Thank you
Great content as always!
Putting all that information in such a short video is a skill !! Great job Marco
I appreciate that!
It's clear that you really care about delivering great content, thanks.
Thank you!
Thanks For Making it Simple and To the Point. Thanks Again.
Very good explanation and selecting key points of topic which lead to really good understanding of jpa and spring boot aspects. Thank you.
Glad you liked it!
You explained very clearly, thank you for helping me in my journey of learning java
Was reading in to spring and decided to take a minute too understand its jpa features origin and differences between jpa and hibernate. Answered a lot of questions and contains good amount of easy to consume informations. :)
Great to hear!
Marco, You're doing awesome job!
Thanks! 😃
Great Video.
Love how the frustration is visible throughout :D
:D
A very nice video that taught me a lot of things. Thank you.
Great video! I loved how everything was explained, it was super easy to digest. It helped me so much to refresh all my knowledge about this topic, in fact I think I have it way more clear now than when I studied it in college 😂
I like the style of how fast this turtorial comes to the point and covers the essentials. How would the world look like if everyone would do such kind of high quality tutorials? 😄 Great teaching skills Marco, thumbs up 👍
Thank you!
Amazing content, Congrats !!!
Great video, thanks!
very well explained. I hope your channel becomes more popular.
Thanks. I hope so too :)
You deserve millions of subscribers and viewers, your contents quality is amazing
Thank you for the kind words, really appreciated.
Thanks. Very clear explanation.
Glad it was helpful!
This was amazing!! Currently i got my first job as software developer and my company mainly uses springboot and this video helped me clear a lot of thoughts, thanks
Congrats!
22:45 I have been looking for answers to these questions from Indian bros for 2 days, thank you for answering my questions in 1 minute. Thanks
I was looking for a quick overview of hibernate that we will cover this week, and this fit perfectly. I like the clarity and "to the point" , practical approach of your tutorial. If I see a course on Udemy by you, I will definetely buy it!
Thanks! There won't be any Udemy courses by me, though :)
this is really good video thank you :) thumbs up
the best hibernate video
awesome video Marco i like it
Thanks man!
Nice and useful. Thanks
Glad it was helpful!
Thank you very much for sharing
Welcome.
Awesome!
wow..awesome dude
you are a King
If all channels taught like Marco, we'd be working in Google rn.
LOL I love this guy.
i am a beginner but i got points like html speed of video is 1.5 nice way of explaing sir thank you for making video
thank you
Your repository was a little light public interface CrudRepository extends Repository
Thanks!
awesome
I like you Marco, I like your way of sharing and teaching. I wish that you will see my comment ! Im a software engineer by the way
Hi Hassan and thanks!
🎉 nice
i like to watch tutorials side by side with an running IDE - i have a wish: for every video episode i would like to have a starting Github Repo - (and maybe a result repo) - or and initial commit or branch and an final commit or branch to the repo - then i also can compare my repo with the final repo if i miss some setting while replay your steps in the IDE
i looked through your repos on github but can not find a repo with 'org.example.user` and a file `schema.sql`
Your wish is already fulfilled: github.com/marcobehlerjetbrains/hibernate-tutorial.git . I just forgot to add the repo to the description, but usually all my videos come with the repo. Let me know if that helps.
@@MarcoCodes thanks a lot - i was not aware that you have an additional dedicated marcobehlerjetbrains account :) i searched in the wrong user space :)
What about the newer version of the book "Java Persistence with Spring Data and Hibernate", do you recommend that one? Or did you specifically put in the old one because of quality reasons?
(nevermind, the book I mentioned was released AFTER your video)
Yup, released after my video but even the older version would do. Enjoy the journey!
Thanks a lot for this! Clear and concise you really helped me understand what's going on. Is 2nd edition book recommended, or will the 1st edition from 2007 be enough to start? (few € for older vs many € for 2nd)
Wouldn't recommend the 1st edition anymore. There is even a 3rd edition out already, so I would go for either 3rd or 2nd.
You know this guy is experienced when hes gone through the curve of: Light mode, Dark mode, back to light mode. Thats where the gigachad devs sit
:D
If you define the User class into the hibernate.cfg.xml class, why do you need the @Entity annotation ?
It's a good question. I.e. you could probably leave out @Entity specifying the class directly in hibernate.cfg.xml - however, in most real life applications you'll have some sort of package scan/component scan, and then you definitely need @Entity to make it work - as opposed to specifying every class manually. Give it a try and see what Hibernate does!
instead of the empty constructor you could make a NoArgsControctor annotation above classname
If you are using Lombok, yes - which I am however not using in this video.
I love Java
So what will happen if you create an entity class and you forget the empty constructor ? Btw if we assume that you have a constructor with all parameters why hibernate cant manage to create an object and to save it successfully
If I remember correctly, if you're missing the (implicit or explicit) no-arg constructor, you'll simply get an exception thrown, but you'll need to try it out :)
As for your second question, I suppose there are a multitude of reasons, i.e. that afaik the reflections API doesn't easily work with constructors, that having super-long constructors for classes/tables with tons of fields is akward etc etc, but don't take it as the final say :D
Thanks for ur excellent video! but do u use LIGHT THEME bro?
For videos, yes. For normal work,.dark theme.
My java ee application uses an EntityManager throughout, so when I am writing unit tests I need to create an EntityManager configured to use a test database to give to my application code. I created a hibernate.cfg.xml file in src/test/resources. I have a problem though that my entities are not being scanned correctly. In the config file there is a packagesToScan property which lists the package where entities are in my application. However, those packages are in src/main/java, while my tests are in src/test/java. This is causing the problem that when I create a query with the name of my entity, I get an exception which says my entity is not mapped. How do I tell hibernate to scan a package in a different directory?
I unfortunately cannot do a proper remote-diagnosis. Hope you could work this out.
thanks ryan gosling for teaching me hibernate
:)
19:30 - Generated Sources User_
They are not recognized by IntelliJ out of the box. I need to right tap at "target/generated-sources" node and select "Mark Directory as ..." / "Generated Sources Root" to be able to have an Import Option with the User_ class.
But somehow this feels cheating if i have to setup something in the IDE after git checkout. I think this should be somehow in some settings files. i found some "howto" with a Gradle file. but this project is not using Gradle.
How is the right way to setup the generated sources?
Have a look at the pom.xml file from the sample project. There's a "build-helper-maven-plugin" specified, which does add the sources automatically to your IntelliJ.
@@MarcoCodes but if i run a "normal" build "Build Project" in IntelliJ this add-source goal was not executed?
hi. i'm trying to set up the hibernate meta model generation in my spring boot application.
how do I generate the sources? jaxb-runtime doesn't seem to be wokring.
PS. I'm new to java, so i'm not exactly knowledgeable in configuring pom.xml and all. Also, I'm using VS code.
Hi Jose, it's unfortunately hard to tell without ...sitting at your desk/having your sources.
@@MarcoCodes I know. But no worries. It seemed like I needed to reload vscode after putting the maven plugin. It's working now. 👍
Just took four hours to figure that out.
My googling tells me that JPA is a specification and that Hibernate is an implementation for that specification. That being said, I'm worried that I'll be confused if I read through the Java Persistence with Hibernate book when I go to work with JPA in for example Spring Boot. Is there no JPA specific book you could recommend?
No need to worry: 99% (oversimplified) of the time when you use JPA in a Spring Boot application, it's with Hibernate as the "persistence provider". And the book gives you a perfect foundation for both, the JPA spec + Hibernate - there is no such thing as "just a JPA book", because as you said, it's just a specification.
@@MarcoCodes Thank you for the quick reply. One thing I’d like to highlight is that the same author/authors are releasing a new book called “Java Persistence with Spring Data and Hibernate” listed on Amazon with a release date on the 14th of February 2023.
I wonder if that will act as an upgrade/replacement for the book recommended in this video.
I’m thinking of simply waiting for this new book.
Any thoughts?
My current situation is I’m doing a two year Java degree. I’m in my second year and I’m starting a Volvo internship in february where they use Java/Spring Boot.
Two things: Working through the book will realistically take you months, so it's basically always better to have started yesterday :) Plus, Spring Data comes,essentially, on top of Hibernate/JPA and everything that is in the second edition will still be valid. I.e. I would start working through the book now, and then additionally do the Spring Data once it's released, as sort of a refresher + expansion of knowledge :)
Is it good practice/required to open and commit a transaction if you're just reading from the database?
Long story, but short answer: If you don't explicitly open up the transaction yourself, your database will anyway open an implicit transaction. There are plenty of threads on this on stackoverflow, if you search around.
@@MarcoCodes Thank you so much! I really enjoy your content. I discovered you in this month's Java Annotated Monthly.
Where can I get Hibernate Jar files for Ubuntu operating system.
Unfortunately this question doesn't really make sense. What specifically are you trying to do?
@@MarcoCodes i need Hibernate external jar files I want to add in eclipse... But I am using Java eclipse on Ubuntu ..
how to setup hibernate I am too confused there are too many error I am getting
bruh please add setup at beginning
Check this out: docs.jboss.org/hibernate/orm/6.4/quickstart/html_single/
❤🧡💛💚💙💜🤎🖤🤍 Ich mag dich soooo viel
1:32 content: why use it
I can sense the level of hate Marco has for hibernate 😂😂😂.
Really no hate towards Hibernate, but would love to see more people understand "what" they are using :D
I'm also named Marco, I also like Java, I want to work in Java, I look like you but worse 🤣🤣🤣🤣🤣
came here after wasting weeks on hibernate courses
I respect you but this course is very lacking, i know the hibernate framework is complex, but usually when i see crash crouse or a youtube video it means i'm struggling with documentation, you can't just say "go read a book" when you reach important notes.
This video is kind of useless.
Thank you for your efforts tho.
Mhmhmh.
Hi, very helpful video. I followed your tutorial but now I receive this error:
org.hibernate.query.sqm.UnknownEntityException: Could not resolve root entity 'Usuario'.
This is the query that I'm doing:
Query query = session.createQuery("SELECT u FROM Usuario u", Usuario.class);
entities = query.getResultList();
And this is the entity in question:
@Entity
@Table(name = "Usuario")
public abstract class Usuario
I really have no idea of what is wrong, could you help me?
Try removing the "abstract" keyword
@@MarcoCodes Doesn't work either, seems to be something related to the mapping configuration, but I cannot find a solution. The NativeQuery works so I am using that at the moment. Thanks for the comment
Intellij paid version right?
Yep.
thank you