JPA in Vaadin CSCI 3130 Winter 2016. What is JPA?  Java Persistence API  Allows for “easy” storage of Java Objects  Is a type of Object Relational.

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Presentation transcript:

JPA in Vaadin CSCI 3130 Winter 2016

What is JPA?  Java Persistence API  Allows for “easy” storage of Java Objects  Is a type of Object Relational Mapping (ORM) framework  Book of Vaadin: /part/framework/jpacontainer/jpacontainer- overview.htmlhttps://vaadin.com/docs/- /part/framework/jpacontainer/jpacontainer- overview.html  Java Persistence API  Allows for “easy” storage of Java Objects  Is a type of Object Relational Mapping (ORM) framework  Book of Vaadin: /part/framework/jpacontainer/jpacontainer- overview.htmlhttps://vaadin.com/docs/- /part/framework/jpacontainer/jpacontainer- overview.html

How does it work? Your ObjectsYour UI JPA Database

How do I use it?  Carefully! 1.Update ivy.xml 2.Change Project Facet 3.Edit persistence.xml 4.Define Data Model 5.Connect JPA to UI  Carefully! 1.Update ivy.xml 2.Change Project Facet 3.Edit persistence.xml 4.Define Data Model 5.Connect JPA to UI

1. Update ivy.xml

Update ivy.xml  Add these lines to ivy.xml:  Save and wait for the new libraries to download  Add these lines to ivy.xml:  Save and wait for the new libraries to download

2. Add Project Facet

Add Project Facet

Edit Persistence.xml

Edit persistence.xml  persistence.xml tells JPA how to connect to the database  By default it is in src/META-INF/persistence.xml  persistence.xml tells JPA how to connect to the database  By default it is in src/META-INF/persistence.xml

Edit persistence.xml

4. Define Data Model

Define Data Model  Create the classes to hold your data  Annotate data classes  Annotate id field  Annotate @ManyToMany, etc…  For reciprocal relationships, make sure to use mappedBy  Create the classes to hold your data  Annotate data classes  Annotate id field  Annotate @ManyToMany, etc…  For reciprocal relationships, make sure to use mappedBy

5. Connect JPA to UI

Connect JPA to UI  Create a new JPAContainer.  Connect it to a Table, Form, etc.  Perform operations on the container (add, delete, update, etc)  Create a new JPAContainer.  Connect it to a Table, Form, etc.  Perform operations on the container (add, delete, update, etc)