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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UserException or JDOUserException
Annotate a Map field with @ElementCollection or @Basic
Significant I/O costs during batch update or insert data.
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an executable jar that will run on any system with a Java 1.3 JRE or later installed. A Windows EXE (explorer ... Database To open a local database file, use the "File | Open Local" menu command (or the equivalent ... Server Edition) use the "File | Open Remote" menu command (or the equivalent toolbar button). In
database content, or a transient object, i.e. not related to any database. Storing Objects Explicitly ... ().commit(); Multiple objects can become persistent, either by multiple calls to makePersistent(...), or by passing a collection or array of objects to makePersistentAll(...), which is another method
A JDO metadata file is an XML file with a '.jdo' suffix, containing information about one or ... , ObjectDB determines whether or not each class is persistent. It searches for JDO metadata description ... can be specified in a package.jdo file located in META-INF, WEB-INF or in any other path at the level
.PersistenceManagerFactory interface. A PersistenceManagerFactory instance represents a specific database address (local or ... . To access a database file directly using embedded mode, specify either its absolute path or its relative ... The javax.jdo.option.ConnectionURL property specifies the database location and whether embedded mode or