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56

IN expression in a Criteria Query

is with Criteria Language. This code: In<Employee> inExpression = cb.in(root.get(Computer ... that are currently not supported by ObjectDB. They are listed in the issue tracking ... (you should be able to see it in the log, if you enable logging as explained in this forum thread, or by converting
11

Database Explorer

to view data in ObjectDB databases, execute JPQL and JDOQL queries and edit the content of databases. Running the Explorer The ObjectDB Explorer is contained in the explorer.jar executable jar file, which is located in the bin directory of ObjectDB. It depends on the objectdb.jar file. You can run
1

[ODB1] Chapter 7 - JDOQL Queries

There are various ways to retrieve objects from an ObjectDB database, as shown in section 6.3 ... to boost recycling rates in Manchester approved n criteria, and iteration over the results in ... a persistent class) A filter, which is a boolean expression in a Java like syntax The query result
1

[ODB1] Chapter 9 - ObjectDB Explorer

systems are also provided. Running the Executable JAR directly The Explorer is packaged in the main ObjectDB development jar file (odbfe.jar / odbee.jar / odbse.jar), located in ObjectDB's lib ... the Explorer on Windows using the explorer.exe application, located in the bin directory. Notice
1

[ODB1] Chapter 6 - Persistent Objects

Persistent In JDO applications, every object in memory is either a persistent object, i.e. represents some ... is automatically stored in the database when the transaction is committed (unless it is being deleted ... defined in chapter 3). Only the call to makePersistent(...) has to be within an active transaction
1

[ODB1] Chapter 4 - JDO Metadata

more persistent classes. All the persistent classes, and only them, have to be declared in a metadata file ... (possibly in a jar file). 4.1 JDO Metadata Files During JDO enhancement and later at runtime ... of each class in several .jdo files in a pre defined order. If a metadata description is found
1

[ODB1] Chapter 2 - A Quick Tour

by step. Both sample programs are contained in ObjectDB's samples directory. 2.1 Hello World The HelloWorld sample program manages a list of strings in the database. Each time the program is run another string is stored in the database and all the strings in the database are printed to standard
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[ODB1] Chapter 8 - ObjectDB Server

can be accessed by multiple processes simultaneously. In addition, the server supports accessing ... mode are discussed in Section 1.2. Because the JDO API and the format of the database file are the same in both modes, switching between these two modes can be done very easily by simply changing
1

[ODB1] Chapter 5 - JDO Connections

storing, retrieving, updating and deleting database objects, are provided in the next chapter (Chapter ... during their lifetime. For instance, in a web application it is very common to establish a separate database connection for every web request. In general, holding a database connection open for longer
1

[ODB1] Chapter 3 - Persistent Classes

Persistent Classes are user defined classes whose instances can be stored in a database using JDO. Instances of these classes that represent objects in the database are called persistent objects or persistent instances. Objects that do not represent anything in the database (including instances

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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