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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As explained in chapter 2, entity objects can be deleted from the database by: Retrieving ... . Applying changes to the database by calling the commit method. JPQL DELETE queries provide an alternative way for deleting entity objects. Unlike SELECT queries, which are used to retrieve data from
Existing entity objects can be deleted from the database either explicitly by invoking the remove method or implicitly as a result of a cascade operation. Explicit Remove In order to delete an object ... transaction, it can be deleted using the remove method: Employee employee = em.find(Employee.class, 1
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 ... both tests with the default objectdb.conf. In general is an UPDATE/DELETE statement the most efficient way
Enum Constant javax.jdo.ObjectState PERSISTENT_NEW_DELETED Since: JDO 1.0
Enum Constant javax.jdo.ObjectState PERSISTENT_DELETED Since: JDO 1.0
Static Field javax.jdo.listener.InstanceLifecycleEvent int DELETE Since: JDO 2.0
is automatically stored in the database when the transaction is committed (unless it is being deleted ... the object exists in the database. If an object is deleted from the database, its unique ID ... operation of bind(...), because the object is not deleted from the database, just its name is removed
and collection of objects that have to be loaded eagerly are loaded in bulk for better performance ... in a bulk load, which means that every reference requires running a separate query and doing ... ) fields in bulk as well. support Support Bulk load of eager mapped by (inverse) singular references is now supported in build 2.4.4_13. support Support
Hi, I'm trying to do a bulk update of a column in an embedded entity, but I end up with a query execution error because of the "." between the column name of the parent entity and column name of the child entity. The column in the parent entity represents a linked list of an embeddable class
Explains how to apply server side bulk update using a JPA/JPQL query.