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Database Explorer

objects. The [Schema] window shows the user defined persistable types (entity and embeddable classes) in ... that include user defined methods can be supported by the Explorer only when the code of these methods
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Setting and Tuning of JPA Queries

em can be visible to anyone who uses em, even before committing the transaction (but not to users ... uses automatic optimistic locking to prevent concurrent changes to entity objects by multiple users
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Query Parameters in JPA

parameter is received as an input from the user and then embedded in the query string as is. Instead of a simple country name, a malicious user may provide JPQL expressions that change the query
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Is ObjectDB scalable? What are its limitations?

ObjectDB is highly scalable and can manage efficiently databases in a wide range of sizes, from a few Kilobytes to hundreds of Gigabytes and even Terabytes. ObjectDB can be used in small embedded single user applications as well as in heavy loaded multi threaded multi user applications. ObjectDB
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Is ObjectDB better than competing object databases?

databases do not support user defined primary keys, even though this is very useful in almost every application. ObjectDB supports user defined primary keys including composite primary keys. The support
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Step 2: Entity Class and Persistence Unit

/guests.odb"/> <property name="javax.persistence.jdbc.user" value="admin"/> <property name
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[ODB1] Chapter 9 - ObjectDB Explorer

contains (root objects are discussed in chapter 6). The "Query" window enables a user to execute JDOQL ... , executing JDOQL queries containing user defined methods can be supported by the Explorer
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[ODB1] Chapter 2 - A Quick Tour

(line 25), is supported by ObjectDB but not by JDO. In JDO, only instances of special user defined ... of persistent classes. Persistent Classes Persistent classes are user defined classes whose instances
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[ODB1] Chapter 1 - About ObjectDB

to the application's classpath. In this mode, the database file is locked for a single process, and multi user ... embedded database mode, multi user access to a database is supported. JDO Web Hosting The embedded
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javax.jdo.spi.StateManager

currentValue, boolean newValue) Mark the field as modified by the user. Mark the field as modified by the user. Parameters: pc - the calling PersistenceCapable instance field - the field number ... as modified by the user. Mark the field as modified by the user. Parameters: pc - the calling

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.

Need Help?

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