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do not support user defined primary keys, even though this is very useful in almost every application. ObjectDB supports user defined primary keys including

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

injection attacks. Suppose that the name 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

; <schema> ... </schema> <server> ... </server> <users> ... </users> <ssl> ... </ssl> </objectdb> Each one of these seven

window displays a list of bookmarked entity objects. The [Schema] window shows the user ... setting the classpath. For instance, executing queries that include user defined methods

="$objectdb/db/guests.odb"/> <property name="javax.persistence.jdbc.user" value="admin"/>

but not by JDO. In JDO, only instances of special user defined classes (which are called persistent ... Persistent classes are user defined classes whose instances can be stored in the database

="/database/jdo/manual/chapter6">chapter 6). The "Query" window enables a user to execute JDOQL ... , however, do require setting the classpath. For instance, executing JDOQL queries containing user

, the database file is locked for a single process, and multi user support may be achieved only by ... requests using threads, even in embedded database mode, multi user access to a database is supported

JDO JavaDoc Reference Documentation - This interface is the point of contact between managed instances of PersistenceCapable classes and the JDO implementation.