ObjectDB Database Search

( no persistence unit ). Keep the test as simple as possible - remove unnecessary code (but keep it complete

code and documentation distributed under this Agreement, and b) in the case of each subsequent ... , if any, and such derivative works, in source code and object code form. b) Subject to the terms ... the Contribution of such Contributor, if any, in source code and object code form. This patent

performance and can sometimes reduce the amount of Java code needed. Note that query results ... ( c.name ), and the second is the capital city name ( c.capital.name ). The following code ... = capitalName; } } The following code demonstrates how to run this query: String queryStr = "SELECT

to be enhanced. Enhancement improves efficiency in three ways: Enhanced code enables efficient tracking ... explained in Chapter 3 ). Special code is added to enhanced classes that automatically notifies ObjectDB whenever a persistent field is modified. Enhanced code enables lazy loading of entities

and 1,000,000 entities per database), you must specify a valid activation code in an element. Activation codes are generated by running the Activator utility from the command line: $ java -cp objectdb.jar com.objectdb.Activator Each computer requires a specific activation code , but you can specify

the page number (starting from 0 for the first page), the following code retrieves the results ... instance, em , are visible to any code that uses em , even before the transaction is committed ... to all result objects that the query retrieves. For example, the following code sets a pessimistic WRITE

automatic enhancement ( weaving ) in Tomcat it has to be run with ObjectDB as a Java agent ( javaagent:objectdb.jar). When using GlassFish - on the fly enhancement ( weaving ) is automatically enabled

server and open the database file in ObjectDB Explorer : To enable on the fly enhancement ( weaving ... the server node and select Restart. When using GlassFish - on the fly enhancement ( weaving ) is automatically

to software source code , documentation source, and configuration files. "Object" form shall mean any form ... to compiled object code , generated documentation, and conversions to other media types. "Work" shall ... , including but not limited to communication on electronic mailing lists, source code control systems

a criteria query by using the following code : CriteriaQuery q = cb. createQuery (Country.class); Root ... a criteria query by using the following code : CriteriaQuery q = cb. createQuery (Country.class ... .capital can be built as a criteria query by using the following code : CriteriaQuery q = cb

named queries instead of dynamic queries can improve code organization by separating JPQL query strings from Java code . This practice also enforces the use of query parameters instead of embedding ... (MyEntity.class); After running this code , ObjectDB includes MyEntity when searching for named queries.

file by using the code above could generate a backup whose full path is c:\objectdb\backup ... .io.File("c:\\backup")); backupQuery.getSingleResult(); For instance, the code above could create ... is relative to the ObjectDB home directory on the server. For example, in client-server mode, the code

code stores an Employee entity class instance in the database: Employee employee = new Employee ... the EntityManager , or by commit . Referenced embedded objects The following code stores an Employee instance

. The ability to store ordinary objects in the database directly can simplify the code significantly. Less (and more simple) code to write, debug and test, as well as a much easier learning curve leads

em in the following code snippets). The EntityManager serves as a factory for both Query ... ("SELECT c FROM Country c", Country.class); In the preceding code , the same JPQL query

- much faster than any other JPA solution. General Highly optimized code (as a result of many profiling ... other managed objects. Transparent update - changes are detected automatically. Code enhancement is optional

its methods or code . This state is reflected by its persistent fields, including fields inherited from

Jakarta Persistence (JPA) provides annotations to define static, reusable queries at the class level, separating query logic from business code . Query definitions Declare named queries using the following annotations: Specifies a static, named query in the Jakarta Persistence Query Language (JPQL

The configuration element supports renaming packages, classes, and fields in ObjectDB databases. This is a complementary operation to renaming or moving these elements in your IDE during source code refactoring. You specify only these schema changes in the configuration file. As explained in

, supporting community, forums, IDEs support, tools, books, tutorials and sample code . ObjectDB

), cb. isTrue (isInEU)); In the preceding code , non- Predicate Boolean expressions are converted

in Java code . The name of the entity class is not enclosed in quotation marks because type literals

- start writing more effective database code using Java classes and objects! Try an ObjectDB / JPA

classes When you store an entity in the database, its methods and code are not stored

databases when necessary - with exactly the same code .

Copyright (c) 2007, Eclipse Foundation, Inc. and its licensors. All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: Redistributions of source code must retain the above copyright notice

source file with the following code : package guest; import javax.persistence.*; import javax.servlet ... = (EntityManagerFactory)e.getServletContext().getAttribute("emf"); emf.close(); } } The code above: Invokes

to create the new listener class. Now replace the content of the new source file with the following code ... ().getAttribute("emf"); emf.close(); } } The code above: Invokes the Enhancer to enhance the entity class

and paste to replace the new source file content with the following code : package guest; import java.io

slightly different but the code would be the same). The tutorial is based on using a Maven project

the new Spring Controller class. Now replace the content of the new source file with the following code

the new class. Copy and paste the following code into the newly created Point class: package tutorial

to create the new servlet class. Now replace the content of the new source file with the following code

well (dialog boxes and menus might look slightly different but the code would be the same). This tutorial consists of the following steps:

with other NetBeans versions as well (dialog boxes and menus might look slightly different but the code

to replace the new source file content with the following code : package guest; import java.io

) class. Now replace the content of the new source file with the following code : package guest; import

replace the content of the new source file with the following code : package guest; import java.util.List

slightly different but the code would be the same). The tutorial is based on using a Maven project

and paste to replace the new source file content with the following code : package guest; import

to create the class. Copy and paste the following code to the newly created class file: package

In this step we will add code to the Main class (that was generated with the project) in order to store Point objects in the database and then retrieve them from the database. Use copy and paste to replace the content of the Main class with the following content: package tutorial; import javax

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

as well (dialog boxes and menus might look slightly different but the code would be the same). Note

with other Eclipse versions as well (dialog boxes and menus might look slightly different but the code

to replace the new source file content with the following code : package guest; import java.io

and paste to replace the new source file content with the following code : package guest; import java.io

This tutorial demonstrates how to create and run a simple JPA application. The demonstrated application uses JPA to store and retrieve simple  Point entities, where each  Point has two persistent fields -  x and  y . If you already know JPA - the source code will be straightforward

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

and menus might look slightly different but the code would be the same). Note: ObjectDB 2.3.7_04 or