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Retrieving JPA Entity Objects

. Given an EntityManager em, the following code fragment demonstrates the retrieval of an Employee
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Literals in JPQL and Criteria Queries

. Country). That is equivalent to Country.class in Java code. Notice that the name of the entity class
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ObjectDB - Object Database for Java (JPA/JDO)

database code using Java classes and objects! Try an ObjectDB / JPA tutorial now... Protect
2

Defining a JPA Entity Class

Entity Classes Storing an entity object in the database does not store methods and code
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Step 2: Entity Class and Persistence Unit

to replace the new source file content with the following code: package guest; import java.io
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Step 3: Define an EJB Session Bean

) class. Now replace the content of the new source file with the following code: package guest
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Step 3: Define a Spring DAO Component

the content of the new source file with the following code: package guest; import java.util.List
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NetBeans/JPA Spring MVC Web Tutorial

but the code would be the same). The tutorial is based on using a Maven project. Therefore, required JAR
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Step 2: Entity Class and Persistence Unit

with the following code: package guest; import java.io.Serializable; import java.sql.Date; import javax
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Step 4: Add a Controller Class

replace the content of the new source file with the following code: package guest; import javax.servlet

Getting Started

ObjectDB is very easy to use. Follow the Getting Started Tutorial and the Quick Tour manual chapter and in minutes you may be able to write and run first Java programs against ObjectDB.

Prior knowledge or experience in database programming (SQL, JDBC, ORM, JPA, etc.) is not required, but some background in using the Java language is essential.

Need Help?

  1. Search ObjectDB website
  2. Read the FAQ
  3. Follow the Tutorials
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