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Database Connection using JPA

path) directly, bypassing the need for a persistence unit. Any string that starts with A transaction is started by a call to begin

Paths and Types in JPQL and Criteria API

> A path expression always starts with an instance of a user defined class (represented by ... and also serve as a starting point for building more complex paths through navigation. Giving

Database Explorer

, when the Explorer starts it tries to open a connection to the most recently used database ... when the Explorer starts. The [Table (instead of Tree) as a default viewer window

combined index not used

so a quick fix is possible for this specific issue (although a better approach will be needed for a permanent ... > This issue requires further analysis and work, but in order to offer a quick solution ObjectDB 2.7 ... plans for these queries as a quick workaround. support Support To manually select

JPA Lifecycle Events

starting at the top level entity class and then down the hierarchy until the callback methods in the actual entity class are invoked.

Database Management Settings

as the background index activation is completed, ObjectDB can start using the new indexes

SELECT clause (JPQL / Criteria API)

Country AS c WHERE c.name LIKE 'I%' Both Italy and Ireland (whose name starts with 'I') use

Step 1: Create a Maven Web Project

We start by creating a new Maven web project in NetBeans: Open the [New Project] dialog box, e.g. by using File > New Project... start-jetty</id>   

Step 3: Add a Context Listener Class

>The database will be opened (or created if not existing yet) when the web application starts, by ... attribute in the servlet context - when the web application starts (contextInitialized).

[ODB1] Chapter 5 - JDO Connections

to define a separate interface for managing transactions. A transaction is started by ... commit() starts writing to the database it stores the changes in a related temporary