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Java > Open Source Codes > org > apache > derby > iapi > sql > Row


1 /*
2
3    Derby - Class org.apache.derby.iapi.sql.Row
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.sql;
23
24 import org.apache.derby.iapi.types.DataValueDescriptor;
25
26 import org.apache.derby.iapi.error.StandardException;
27
28 /**
29  * The Row interface provides methods to get information about the columns
30  * in a result row.
31  * It uses simple, position (1-based) access to get to columns.
32  * Searching for columns by name should be done from the ResultSet
33  * interface, where metadata about the rows and columns is available.
34  * <p>
35  *
36  * @see ResultSet
37  *
38  * @author Jeff Lichtman
39  * @see org.apache.derby.iapi.sql.execute.ExecRow
40  */
41
42 public interface Row
43 {
44     public int nColumns();
45
46     /**
47      * Get a DataValueDescriptor in a Row by ordinal position (1-based).
48      *
49      * @param position The ordinal position of the column.
50      *
51      * @exception StandardException Thrown on failure.
52      * @return The DataValueDescriptor, null if no such column exists
53      */
54     DataValueDescriptor getColumn (int position) throws StandardException;
55
56     /**
57      * Set a DataValueDescriptor in a Row by ordinal position (1-based).
58      *
59      * @param position The ordinal position of the column.
60      */
61     void setColumn (int position, DataValueDescriptor value);
62
63 }
64
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