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4

Literals in JPQL and Criteria Queries

literals should be used sparingly as queries that use parameters instead of literals are more generic and efficient because they can be compiled once and then run many times with different parameter
4

Online Backup

backup root directory can be specified by setting the target parameter before executing the backup ... parameter it represents a path relative to the ObjectDB home directory, and in client-server mode
4

Paths and Types in JPQL and Criteria API

identification variables and SELECT result variables. Parameters - when instances of these classes are assigned ... with an instance of a user defined class (represented by a variable, parameter or prefix path expression
4

Database Explorer

execution of JPQL and JDOQL queries. To execute a query: Enter a query string. In the [Parameters] table provide arguments for parameters (if any). An entity object can be specified by type
4

javax.persistence.metamodel.ManagedType

the attribute of the managed type that corresponds to the specified name. Parameters: name - the name ... to the specified name. Parameters: name - the name of the represented attribute Returns: CollectionAttribute ... to the specified name and Java element type. Parameters: name - the name of the represented attribute
4

javax.persistence.metamodel.EmbeddableType

. Return the attribute of the managed type that corresponds to the specified name. Parameters: name ... to the specified name. Parameters: name - the name of the represented attribute Returns ... that corresponds to the specified name and Java element type. Parameters: name - the name of the represented
0

javax.jdo.spi.PersistenceCapable

an exception if the other instance is not managed by the same StateManager as this instance. Parameters ... the ObjectIdFieldConsumer to store the values for the key fields. Parameters: fm - the field manager ... single field identity, this method always throws JDOUserException. Parameters: oid - the ObjectId
0

[ODB1] Chapter 6 - Persistent Objects

IDs very useful for representing objects in web applications (in which parameters are represented by strings). If getObjectID(...) is called with a transient parameter, it returns null. If it is called
0

javax.jdo.spi.PersistenceCapable.ObjectIdFieldManager

. This field will be stored in the proper field of the ObjectId. Parameters: fieldNumber - the field ... the field manager. This field will be stored in the proper field of the ObjectId. Parameters ... . Parameters: fieldNumber - the field number of the key field. Returns: the value of the field
0

javax.jdo.FetchGroup

. Parameters: categoryName - Returns: the FetchGroup Throws: JDOUserException - if the FetchGroup ... this FetchGroup. Parameters: memberName - the name of a member to add to the FetchGroup Returns: the FetchGroup Throws: JDOUserException - if the parameter is not a member of the persistent type

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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