About delete

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E-delete.png

E-delete.png
Manual
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Working with JPA Entity Objects

requires using entity objects for many operations, including storing, retrieving, updating and deleting ... . A managed entity object can also be retrieved from the database and marked for deletion, using ... Managed to Removed, and is physically deleted from the database during commit. More details on object
Manual
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JPA Query Structure (JPQL / Criteria)

(update and delete queries have a slightly different form). The other JPQL clauses, WHERE, GROUP BY, HAVING and ORDER BY are optional. The structure of JPQL DELETE and UPDATE queries is simpler: DELETE
Manual
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Chapter 1 - Quick Tour

ObjectDB databases and perform basic CRUD operations (Create/Store, Retrieve, Update and Delete ... , retrieving, updating and deleting Point objects. To run the sample program of this chapter in
Manual
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Database Connection using JPA

. drop - for deleting any existing database content (useful for tests). To connect to an ObjectDB server ... ); EntityTransaction Operations that affect the content of the database (store, update, delete
Manual
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Database Management Settings

and deleted by ObjectDB when the database is closed. The name of the recovery file is based on the name ... in tests). The content of these temporary databases is deleted when using the drop url connection
Manual
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Locking in JPA

that has to be updated or deleted is checked. An exception is thrown if it is found out that an update ... deleted, and compares the version number of that object in the database to the version number
Manual
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SELECT clause (JPQL / Criteria API)

objects, transparent update detection, support for delete, etc. Query results are not limited to entity ... efficiently. They are less productive with operations that update or delete entity objects, in
JDO Doc
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javax.jdo.Query

() Deletes all the instances of the candidate class that pass the filter. Deletes all the instances ... that were deleted, specifically not including the number of dependent and embedded instances. Dirty ... life cycle changes as if deletePersistent were called on them. Specifically, if the class of deleted
JDO Doc
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javax.jdo.JDOEntityManager

statement, e.g., for update or delete. Create an instance of Query for executing a native SQL statement, e.g., for update or delete. Parameters: sqlString - a native SQL query string Returns: the new ... ) Delete the persistent instance from the data store. Delete the persistent instance from the data