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ObjectDB Object Database Features

(no activation depth) - objects are retrieved from the database automatically by navigating from ... , AVG, MAX, MIN). Query Expressions Path navigation expressions using the dot (.) operator. Comparison ... the content of entity objects. Tree view for navigating between entity objects. Database Server Available
Manual
23

FROM clause (JPQL / Criteria API)

support of transparent navigation and fetch makes it very easy to use, since it provides the illusion that all the database objects are available in memory for navigation. But this feature
Manual
23

JPA Query Expressions (JPQL / Criteria)

the following operators (in order of decreasing precedence): Navigation operator (.) Arithmetic operators ... , navigation and types (get, type). Arithmetic expressions (sum, diff, prod, quot, mod, abs, neg
Manual
23

SELECT clause (JPQL / Criteria API)

that JPA provides for managed entity objects, including transparent navigation to other database ... objects are missing the JPA functionality of managed entity objects (e.g. transparent navigation
Manual
16

Collections in JPQL and Criteria Queries

Collections may appear in JPQL queries: as parameters - when collections are assigned as arguments. as path expressions - in navigation to persistent collection fields. IS [NOT] EMPTY The IS [NOT] EMPTY operator checks whether a specified collection is empty or not. For example: c.languages
Manual
16

Date and Time in JPQL and Criteria Queries

Date and time expressions may appear in JPQL queries: as date and time literals - e.g. {d '2011-12-31'}, {t '23:59:59'}. as parameters - when date and time values are assigned as arguments. as path expressions - in navigation to persistent date and time fields. as results of predefined JPQL current
Manual
16

JPA Criteria API Queries

, currentDate, ...). Paths, navigation and types (get, type). Arithmetic expressions (sum, diff, prod
Manual
16

Numbers in JPQL and Criteria Queries

Numeric values may appear in JPQL queries in many forms: as numeric literals - e.g. 123, -12.5. as parameters - when numeric values are assigned as arguments. as path expressions - in navigation to persistent numeric fields. as aggregate expressions - e.g. COUNT. as collection functions
Tutorial
16

Step 2: Create a Project and a Report

the new project: Right click the Reports node in the [Navigator] and select New > Report. Enter
Manual
16

Storing JPA Entity Objects

, the entire closure of entity objects that are reachable from that object by navigation through persistent