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20

how to query by properties of onetomany relations? (Error 990)

future versions. However, this query is invalid. You cannot navigate through collections in JPQL directly ... for the hint chris Christoph Ernst Support of direct navigation from collections (with no JOIN ... on attempt to use the new navigation from collection syntax: Navigation from 'java.util.Set<test.Test$Bar
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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
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JPA Criteria API Queries

, currentDate, ...). Paths, navigation and types (get, type). Arithmetic expressions (sum, diff, prod
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General Performance Issues Illustrated with a Specific Method

General Performance Issues Illustrated with a Specific Method
4

Unexpected Query Token / Casting in Query

;) thanks!! Alex quasado Alexander Adam I fixed some issue in ObjectDB in navigation after casting ... %') but the query still fails - now on navigation to routingNumber. Another casting will not help here because bankAccounts is a collection, and you cannot navigate from a collection in JPA without introducing
3

Step 6: Design a BIRT Report Table

to see the table with the real data: You can run the report by right clicking the report node in the [Navigator] window and selecting Report > Run Report:
3

Step 2: Create a Project and a Report

the new project: Right click the Reports node in the [Navigator] and select New > Report. Enter
1

javax.jdo.Query

). Implementations might choose to support non-mutating method calls as non-standard extensions. Navigation ... for variables might still qualify the candidate instance for inclusion in the result set. Navigation ... . Navigation through single-valued fields is specified by the Java language syntax of field_name.field
0

setFilter(filter)

to support non-mutating method calls as non-standard extensions. Navigation through a null-valued field ... the candidate instance for inclusion in the result set. Navigation through multi-valued fields ... , this is a reserved word which means the element of the collection being evaluated. Navigation through single
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setOrdering(ordering)

in the candidate class or must be a navigation expression starting with a field in the candidate

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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