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Java > Open Source Codes > org > apache > derby > iapi > services > io > Storable


1 /*
2
3    Derby - Class org.apache.derby.iapi.services.io.Storable
4
5    Licensed to the Apache Software Foundation (ASF) under one or more
6    contributor license agreements. See the NOTICE file distributed with
7    this work for additional information regarding copyright ownership.
8    The ASF licenses this file to you under the Apache License, Version 2.0
9    (the "License"); you may not use this file except in compliance with
10    the License. You may obtain a copy of the License at
11
12       http://www.apache.org/licenses/LICENSE-2.0
13
14    Unless required by applicable law or agreed to in writing, software
15    distributed under the License is distributed on an "AS IS" BASIS,
16    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
17    See the License for the specific language governing permissions and
18    limitations under the License.
19
20  */
21
22 package org.apache.derby.iapi.services.io;
23
24 import java.lang.ClassNotFoundException JavaDoc;
25
26 import java.io.IOException JavaDoc;
27
28 /**
29   Formatable for holding SQL data (which may be null).
30   @see Formatable
31  */
32 public interface Storable
33 extends Formatable
34 {
35
36     /**
37       Return whether the value is null or not.
38       
39       @return true if the value is null and false otherwise.
40     **/
41     public boolean isNull();
42
43     /**
44       Restore this object to its (SQL)null value.
45     **/
46     public void restoreToNull();
47 }
48
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