Deleter (Oracle - Berkeley DB Java API)
Date: 2014-01-24

Overview | Package | Class | Use | Tree | Deprecated | Index | Help
| Berkeley DB version 6.0.30
PREV CLASS NEXT CLASS | FRAMES NO FRAMES
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD

## com.sleepycat.persist.evolve
Class Deleter

    java.lang.Object
      com.sleepycat.persist.evolve.Mutation
          com.sleepycat.persist.evolve.Deleter

All Implemented Interfaces:
  Serializable

    public class Deleter

extends Mutation

A mutation for deleting an entity class or field.

WARNING: The data for the deleted class or field will be destroyed and will be recoverable only by restoring from backup. If you wish to convert the instance data to a different type or format, use a `Conversion` mutation instead.

For example, to delete a field:

      package my.package;

      // The old class.  Version 0 is implied.
      //
      @Entity
      class Person {
          String name;
          String favoriteColors;
      }

      // The new class.  A new version number must be assigned.
      //
      @Entity(version=1)
      class Person {
          String name;
      }

      // Add the mutation for deleting a field.
      //
      Mutations mutations = new Mutations();

      mutations.addDeleter(new Deleter(Person.class.getName(), 0,
                                       "favoriteColors");

      // Configure the mutations as described here.

To delete an entity class:

      package my.package;

      // The old class.  Version 0 is implied.
      //
      @Entity
      class Statistics {
          ...
      }

      // Add the mutation for deleting a class.
      //
      Mutations mutations = new Mutations();

      mutations.addDeleter(new Deleter("my.package.Statistics", 0));

      // Configure the mutations as described here.

See Also:
  `Class Evolution`, Serialized Form

Constructor Summary
`Deleter(String className, int classVersion)` Creates a mutation for deleting an entity class.
`Deleter(String declaringClass, int declaringClassVersion, String fieldName)` Creates a mutation for deleting the given field from all instances of the given class version.

Method Summary
`String` | `toString()`

Methods inherited from class com.sleepycat.persist.evolve.Mutation
`equals, getClassName, getClassVersion, getFieldName, hashCode`

Methods inherited from class java.lang.Object
`clone, finalize, getClass, notify, notifyAll, wait, wait, wait`

Constructor Detail

### Deleter

    public Deleter(String className,
                   int classVersion)

  Creates a mutation for deleting an entity class.

### Deleter

    public Deleter(String declaringClass,
                   int declaringClassVersion,
                   String fieldName)

  Creates a mutation for deleting the given field from all instances of the given class version.

Method Detail

### toString

    public String toString()

  Overrides:
    `toString` in class `Mutation`

Overview | Package | Class | Use | Tree | Deprecated | Index | Help
| Berkeley DB version 6.0.30
PREV CLASS NEXT CLASS | FRAMES NO FRAMES
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD

Copyright (c) 1996, 2014 Oracle and/or its affiliates. All rights reserved.