ObjectDB ObjectDB

Internal Website Search

21-30 of 200 resultsRefresh

JPA Persistable Types

their ordinal numbers. Caution is required when modifying an enum type that is already in use in an existing database. New enum fields can be added safely only at the end (with new higher ordinal numbers ... of the color1 and color2 fields are stored as ordinal numbers (i.e. 0, 1, 2) while values

Query Parameters in JPA

(?) followed by a positive int number. Apart from the different notation, named parameters and ordinal ... Parameter) rather than by names or numbers. See the Parameters in Criteria Queries section ... of which are overridden in TypedQuery. That large number of methods is not typical to JPA

JPA Entity Fields

maintains a version number for every entity object. The initial version of a new entity object ... is modified its version number is automatically increased by one. Version fields are used in conjunction

Collections in JPQL and Criteria Queries

if the collection is empty and TRUE otherwise. SIZE The SIZE(collection) function returns the number of elements in a specified collection. For example: SIZE(c.languages) is evaluated to the number

WHERE clause (JPQL / Criteria API)

the WHERE clause are passed through to the SELECT. In multi-variable queries the number of tuples ... )); Multiple Restrictions The second where method takes a variable number of arguments of Predicate type

Step 6: Design a BIRT Report Table

In this final step we will add a simple table to the report: Open the [Insert Table] dialog box by dragging a Table from the [Palette] window and dropping it on the report design (.rptdesign) layout. Set the column number to 2, number of details to 1, select the data set (e.g. Points by X) in


- the field number currentValue - the current value of the field Returns: the new value for the field ... instance field - the field number currentValue - the current value of the field Returns: the new ... PersistenceCapable instance field - the field number currentValue - the current value of the field

[ODB1] Chapter 6 - Persistent Objects

is returned, and its toString() returns a temporary negative number, because a database object ID ... .getObjectId(person); String s1 = oid.toString(); // s1 contains a temporary negative number pm.currentTransaction().commit(); String s2 = oid.toString(); // s2 contains a permanent positive number

[ODB1] Chapter 8 - ObjectDB Server

number that was specified during server startup in order for the stop/restart command to have any ... database file or multiple database files of any number of users. As long as only one user is involved

[ODB1] Chapter 9 - ObjectDB Explorer

command. In the dialog box you have to specify the number of objects to construct and their type ... of appearance. This is especially useful when working with classes with a large number of fields

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?

  1. Search ObjectDB website
  2. Read the FAQ
  3. Follow the Tutorials
  4. View or post in the forum
  5. Search or file an issue
  6. Contact support