About database

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database migration

database migration
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Handling a case of searching an empty database

Handling a case of searching an empty database
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10

How do I Remove an entity from the Database ?

How do I Remove an entity from the Database ?
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How to check if an entity exists in a Database without loading it?

How to check if an entity exists in a Database without loading it?
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Source control of database

Source control of database
Forum
10

Eclipse/JPA database tutorial

Eclipse/JPA database tutorial
JPA Doc
9

JPA Exceptions

, an attempt to update the database with no active transaction is represented by: Database update ... to retrieve entity objects from the database. For example, when a required entity object is not found: or during query execution: The lock exceptions (above) may also be thrown during retrieval, if database
Manual
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Setting and Tuning of JPA Queries

on which they were invoked). Flush Mode (setFlushMode) Changes made to a database using an EntityManager ... . Therefore, before a query is executed, uncommitted database changes (if any) have to be flushed to the database in ... ); Flushing changes to the database before every query execution affects performance significantly
Tutorial
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Step 2: Define a JPA Entity Class

To store objects in an ObjectDB database using JPA we need to define an entity class: Open the [New ... to create the new class. The new class should represent Guest objects in the database. Use copy ... + ")"; } }  The new class should represent Guest objects in the database. Besides the @Entity
Tutorial
9

Step 2: Entity Class and Persistence Unit

To store objects in an ObjectDB database using JPA we need to define an entity class: Open the [New ... the [Provider and Database] step just click Finish to generate a default persistence.xml file ... in the database was created in the project (under Source Packages > guest). Use copy and paste