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JPA Query Expressions (JPQL / Criteria)

, isMember, isNotMember, size). Comparison expressions (equal, notEqual, gt, ge, lt, le, between, isNull, ...) Logical expressions (and, or, not, isTrue).

Auto Generated Values

) and an allocation size (the default is 50). A sequence is global to the application and can be used by

Numbers in JPQL and Criteria Queries

- when the return value is numeric, e.g. INDEX, SIZE. as string functions - when the return value is numeric, e


, the following query deletes the countries with population size that is smaller than a specified limit

Chapter 6 - Configuration

and kilobytes (respectively), can be used in any size value attribute in the configuration file

Entity Management Settings

the size of the shared level 2 cache that is managed by the EntityManagerFactory and shared by

Paths and Types in JPQL and Criteria API

one group, and COUNT calculates its size). Criteria Query Paths and Types Paths and navigations

JPA Criteria API Queries

, ...). Collection expressions (isEmpty, isNotEmpty, isMember, isNotMember, size). Comparison

ORDER BY clause (JPQL / Criteria API)

The ORDER BY clause specifies a required order for the query results. Any JPQL query that does not include an ORDER BY clause produces results in an undefined and non-deterministic order. ORDER BY Expressions The following query returns names of countries whose population size

[ODB1] Chapter 2 - A Quick Tour

list.add("Hello World " + list.size()); 30 31 // Display the content

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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