About delete
DELETE Queries in JPA/JPQL
Explains how to apply server side bulk delete using a JPA/JPQL query.... by calling the commit method. JPQL DELETE queries provide an alternative way for deleting entity ... which are used to retrieve data from the database, DELETE queries do not retrieve data from the database, but when executed, delete specified entity objects from the database. Removing entity ...
Deleting JPA Entity Objects
Explains how to use JPA to delete (remove) entity objects from the database.... Remove Orphan Removal DELETE Queries Explicit Remove In order to delete an object from the database it has to first be retrieved (no matter ...
CRUD Operations with JPA
Explains how to use JPA for CRUD database operations (persist, retrieve, update, remove). The following subsections explain how to use JPA for CRUD database operations: Storing JPA Entity Objects Retrieving JPA Entity Objects Updating JPA Entity Objects Deleting JPA Entity Objects ...
Chapter 3 - Using JPA
Explains how to store, retrieve, update and delete entity objects using JPA. This chapter explains how to manage ObjectDB databases using the Java Persistence API (JPA). The first two pages introduce basic JPA interfaces and concepts: Database Connection using JPA Working with JPA Entity Objects ...
Is there a function of "drop table" or "delete from table"?
Besides the em.remove() one by one, is there a function of "drop table" or "delete from table"? TIA ... one by one, is there a function of "drop table" or "delete from table"? TIA Institute of Computer ... edit delete gzdillon ...
JPQL Update & Delete (JPA 1.0)
The JPQL (Java Persistence Query Language) supports updating and deleting database objects by queries. Currently ObjectDB supports only JPQL SELECT queries.Delete queries are supported for JDOQL (JDO Query Language).... ObjectDB supports only JPQL SELECT (retrieval) queries. Delete queries are supported for JDOQL (JDO Query Language). ... edit delete support ...
Bulk Delete and Update - best practice?
The attached test creates 1000 large objects and then attempts to delete them all in one go using a DELETE statement. I'm trying to run with -Xmx512m but the test runs out of memory during the delete. The attachment also contains an update test which has similar memory problems. I'm running both tests with the default objectdb.conf. In general is an UPDATE/DELETE statement the most efficient way to update/remove a large number of objects? ... test creates 1000 large objects and then attempts to delete them all in one go using a DELETE statement. I'm trying to run with -Xmx512m but the test runs out of ...
OneToMany and cascade delete problem
Hi, I don't really know if this is a bug or maybe model that I make is bad. I have a problem with with two different classes with OneToMany relation to one, shared class. For example (first class): @Entity public static class Store { @OneToMany(targetEntity = Offer.class, mappedBy = "store") private List<Offer> offers; } second class: ... edit delete lwalkowski ... I think that the Offer class and cascading delete from Product to Offer are irrelevant to the exception. ...
Running JPA Queries
Explains how to use JPA to run Java Persistence Query Language (JPQL) queries.... addition, the Query interface defines a method for running DELETE and UPDATE queries: Query.executeUpdate ... Query's method Execute an update or delete statement. See JavaDoc Reference Page... - for running only ...
Issue with cascade delete & add/remove
Hi, Please see the attached sample project (important: classes need to be enhanced as done in the pom.xml file). ... Entities within the collection of a Contact when we delete the Contact? Is that cascaded or do we need to clear the collection ... edit delete quasado ...
