org.eiichiro.acidhouse

Interface Delete<E>

All Superinterfaces:

Command<Integer>

public interface Delete<E>
extends Command<Integer>

Delete is a command interface to delete entities match to the specified Filters in Acid House's transactional session. This command execution returns the count of deleted entities. You can build & execute this command as the following code, in App Engine example:

 import org.eiichiro.acidhouse.Session;
 import org.eiichiro.acidhouse.appengine.AppEngineDatastoreSession;
 ...
 
 // Creating 'Session' instance.
 Session session = new AppEngineDatastoreSession();
 // Beginning transaction.
 Transaction transaction = session.beginTransaction();
 // Getting metamodel instance of 'Entity3' class.
 Entity3$ entity3$ = Metamodels.metamodel(Entity3.class);
 
 try {
        // Deleting all of 'Entity3' entities which their 'entity1.i' property value 
  // is less than 15.
        session.delete(entity3$)
                        .filter(entity3$.entity1.i.lessThan(15))
                        .execute();
        // Committing transaction.
        transaction.commit();
 } catch (Exception e) {
        transaction.rollback();
        throw e;
 } finally {
        session.close();
 }
 

Author:

Eiichiro Uchiumi

Method Summary

Methods

Modifier and Type	Method and Description
Delete<E>	filter(Filter<?>... filters) Qualifies entities to be deleted with the specified Filters.

Methods inherited from interface org.eiichiro.acidhouse.Command

execute

Method Detail

filter

Delete<E> filter(Filter<?>... filters)

Qualifies entities to be deleted with the specified Filters. Each of the specified filters is combined with "logical and".

Parameters:

filters - Filters to qualify entities to be deleted.

Returns:

The Delete to delete entities qualified with the specified Filters.