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manual

Comparison in JPQL and Criteria API

Explains how comparison operators can be used in JPQL queries, including in comparing null values.... Set 2 - Java / JDO Less Than < < ... > Less Than or Equal To <= ...

 
api-jpa

javax.persistence.criteria.CriteriaBuilder

Used to construct criteria queries, compound selections, expressions, predicates, orderings.(Interface of JPA)

 
api-jpa

lt(x, y)

Create a predicate for testing whether the first argument is less than the second.(Method of javax.persistence.criteria.CriteriaBuilder)

 
forum_thread

Cache usage

after a runtime of several weeks we are now analyzing the usage of the cache and so on. Looking at the heap dump we suspect that the cache is really used (see heap dump attached), the RAM allocated by objectdb is much less than we would expect. The database file has around 25 GByte of size and there is heavy traffic of around 400 clients communicating permanently via webSockets to the objectdb. The config is attached as well. The question is: is the cache really used ? ... heap dump attached), the RAM allocated by objectdb is much less than we would expect. The database file has around 25 GByte of ... the size of the database page cache was about 1.4GB. It is less than the 2GB specified in the configuration, but the cache is purged ...

 
manual

WHERE clause (JPQL / Criteria API)

Explains how to use the WHERE clause in a JPQL query.... a predicate for testing whether the first argument is less than the second. See JavaDoc Reference Page... ( c. get ... a predicate for testing whether the first argument is less than the second. See JavaDoc Reference Page... ( c. get ...

 
api-jpa

le(x, y)

Create a predicate for testing whether the first argument is less than or equal to the second.(Method of javax.persistence.criteria.CriteriaBuilder)

 
manual

JPA Query Expressions (JPQL / Criteria)

Describes JPA query (JPQL / Criteria API) expressions (literals, operators and functions).... a predicate for testing whether the first argument is less than the second. See JavaDoc Reference Page... , le ... a predicate for testing whether the first argument is less than or equal to the second. See JavaDoc Reference Page... , ...

 
forum_thread

Out of memory

Hi, Today in the middle of the night ODB just crashed leaving this on console screen: ... also try reducing concurrent memory consumption by using less working threads  on the server side. Maybe changing some ... the maximum heap size (or configuring ObjectDB to use less memory) should solve the problem. The database size should not be ...

 
manual

JPA Entity Fields

Explains how to define and use primary keys in JPA, including composite and embedded primary keys.... Note : Navigation through inverse fields is much less efficient than navigation through ordinary persistent fields, since ... ; } A single value inverse field is less efficient than an inverse collection or map field because no proxy class ...

 
manual

JPA Criteria API Queries

Explains how to use the JPA Criteria API (CriteriaBuilder, CriteriaQuery, etc.) to build JPQL like queries.... a predicate for testing whether the first argument is less than the second. See JavaDoc Reference Page... , le ... a predicate for testing whether the first argument is less than or equal to the second. See JavaDoc Reference Page... , ...