 333 | 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 |
253 | 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 |
66 | Static Field javax.jdo.listener.InstanceLifecycleEvent int DELETE Since: JDO 2.0 |
66 | Enum Constant javax.jdo.ObjectState PERSISTENT_DELETED Since: JDO 1.0 |
66 | Enum Constant javax.jdo.ObjectState PERSISTENT_NEW_DELETED Since: JDO 1.0 |
62 | Explains how to store, retrieve, update and delete entity objects using JPA. |
62 | Explains how to use JPA for CRUD database operations (persist, retrieve, update, remove). |
33 | it to store, retrieve, update and delete database objects. Storing New Entity Objects The following ... and Deleting Entities JPA refers to entity objects that are associated with an EntityManager as 'managed ... to retrieve them (e.g. as a Query factory). To delete an object from the database, you need to obtain |
33 | other case. In addition, the Query interface defines a method for running DELETE and UPDATE queries: Query.executeUpdate - for running only DELETE and UPDATE queries. Ordinary Query Execution ... , they have to be caught and handled. DELETE and UPDATE Query Execution (with executeUpdate) DELETE and UPDATE queries |
31 | persist() to write them to the database. But does running a JPQL update or delete alter the in-memory ... , but I'm not sure if that will alter my program state. Will it? Thanks, Lee UPDATE and DELETE queries ... between memory and database objects. See these manual pages for more details: DELETE queries UPDATE |