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Chapter 4 - JPA Queries (JPQL / Criteria)

The JPA Query Language (JPQL) can be considered as an object oriented version of SQL. Users familiar with SQL should find JPQL very easy to learn and use. This chapter explains how to use JPQL as well as how to use the JPA Criteria API, which provides an alternative way for building queries in JPA
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Chapter 2 - JPA Entity Classes

JPA Entity classes are user defined classes whose instances can be stored in a database. To store data in an ObjectDB database using JPA you have to define entity classes that represent your application data object model. This chapter explains how to define and use entity classes.
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JPA Lifecycle Events

Callback methods are user defined methods that are attached to entity lifecycle events and are invoked automatically by JPA when these events occur. Internal Callback Methods Internal callback methods are methods that are defined within an entity class. For example, the following entity class
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JPA Queries

only at runtime (e.g. depending on which fields are filled by a user in a form) can be done by
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UPDATE SET Queries in JPA/JPQL

queries can only be executed within an active transaction and the changes are visible to other users
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ObjectDB Website - Terms and Conditions of Use

of the site. Use of any such linked web site is at the user's own risk. 7. Site Terms of Use Modifications
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SSL Configuration

.createEntityManagerFactory( "objectdbs://localhost/myDbFile.odb;user=admin;password=admin");
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DELETE Queries in JPA/JPQL

queries can only be executed within an active transaction and the changes are visible to other users
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Entity Management Settings

for instances of serializable types that are non persistable otherwise (e.g. a user defined class
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Step 2: Entity Class and Persistence Unit

.jdbc.user" value="admin"/> <property name="javax.persistence.jdbc.password" value="admin

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.

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