From the course: Java Persistence with JPA and Hibernate
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Finding and updating an existing entity instance - JPA Tutorial
From the course: Java Persistence with JPA and Hibernate
Finding and updating an existing entity instance
- [Instructor] Now, let's go to another use case. This time, you are going to find an existing entity instance and make some changes in it. Now, you'll notice that I've restructured the code a bit from what you saw in the previous video. The code to create a new entity instance has been moved to its own method named createInstance, and it has been called from the Main method. We are considering each new scenario as a new use case going forward in this course. Each new use case will have its own persistence context. This is how you'll have it in a real world application, as well. So you create an EntityManager every time you start a new use case, begin a new transaction and commit it at the end of the use case. In the book table, go to the book table, right click and show records. Now, there are three records. I simply executed this use case two more times to add two more records. That's why you see the book name as my book3 here. What you now need to do is to grab a book by the…
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Finding and updating an existing entity instance7m 12s
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Attaching and detaching an entity instance4m 42s
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Removing an entity instance2m 42s
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Using the getReference() and refresh() methods5m 53s
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Using composite keys on an entity8m 1s
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Challenge: Art Class Management app, part 31m 29s
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Solution: Art Class Management app, part 34m 8s
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