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8

JPA Named Queries

A named query is a statically defined query with a predefined unchangeable query string. Using named queries instead of dynamic queries may improve code organization by separating the JPQL query strings from the Java code. It also enforces the use of query parameters rather than embedding literals
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Literals in JPQL and Criteria Queries

values. Literals should only be embedded in JPQL queries when a single constant value is always used
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Deleting JPA Entity Objects

(); The entity object is physically deleted from the database when the transaction is committed. Embedded
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Entity Management Settings

The <entities> configuration element specifies front end settings that are relevant on the client side and in embedded mode. The default configuration file contains the following <entities> element: <entities> <enhancement agent="true" reflection="warning" /> <cache ref="weak" level2="0mb
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BIRT/ODA ObjectDB Driver

- either embedded (e.g. c:\points.odb) or client-server (e.g. objectdb://localhost/points.odb;user=admin
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Step 3: Create an ObjectDB Data Source

). Specify an ObjectDB connection url - either embedded (e.g. c:\points.odb) or client-server (e.g
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Step 6: Run the Web Application

You can run the application now by right clicking the GuestServlet node (in the [Project Explorer] window) and selecting Run As > Run on Server > Finish: Since we are using ObjectDB in embedded mode - the database file is created under the Tomcat directory. You can stop the Tomcat server and open
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Step 6: Run the Java EE 6 Application

You can run the application now by right clicking the GuestServlet node (in the [Projects] window), selecting Run File, and then clicking OK (no need to change the servlet execution URI). Since we are using ObjectDB in embedded mode - the database file is created under the GlassFish directory (e.g
1

Step 6: Run the Web Application

You can run the application now by right clicking the GuestServlet node (in the [Projects] window), selecting Run File, and then clicking OK (no need to change the servlet execution URI). Since we are using ObjectDB in embedded mode - the database file is created under the Tomcat directory
0

[ODB1] Chapter 9 - ObjectDB Explorer

file. This command is available only when accessing a local database using embedded mode. 9.4 Tools

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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