RdbStringQueryLeaf


1   /**
2    * MEDOR: Middleware Enabling Distributed Object Requests
3    * 
4    * Copyright (C) 2001-2003 France Telecom R&D
5    * Contact: alexandre.lefebvre@rd.francetelecom.com
6    *
7    * This library is free software; you can redistribute it and/or
8    * modify it under the terms of the GNU Lesser General Public
9    * License as published by the Free Software Foundation; either
10   * version 2.1 of the License, or (at your option) any later version.
11   *
12   * This library is distributed in the hope that it will be useful,
13   * but WITHOUT ANY WARRANTY; without even the implied warranty of
14   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15   * Lesser General Public License for more details.
16   *
17   * You should have received a copy of the GNU Lesser General Public
18   * License along with this library; if not, write to the Free Software
19   * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
20   *
21   * Initial developers: M. Alia, A. Lefebvre
22   */
23  
24  package org.objectweb.medor.query.rdb.api;
25  
26  import org.objectweb.jorm.type.api.PType;
27  
28  /**
29   * An RdbStringQueryLeaf is an RdbQueryLeaf built from a SQL request provided
30   * as a String.
31   * The Medor optimizer cannot "reason" with an RdbStringQueryLeaf, and namely
32   * cannot collapse several RdbStringQueryLeaves on the same datastore into one.
33   * Such an RdbStringQueryLeaf is thus a "black box".
34   * If RdbQueryLeaves should be collapsed into one for optimisation purposes,
35   * RdbExpQueryLeaves should be used instead.
36   * @see org.objectweb.medor.query.rdb.api.RdbQueryLeaf
37   * @see org.objectweb.medor.query.rdb.api.RdbExpQueryLeaf
38   *
39   * @author  <A HREF="mailto:alia.mourad@rd.francetelecom.com><b>
40   *          Mourad Alia
41   *          </b></A>
42   *      <A HREF="mailto:alexandre.lefebvre@rd.francetelecom.com><b>
43   *          Alexandre Lefebvre
44   *          </b></A>
45   */
46  public interface RdbStringQueryLeaf extends RdbQueryLeaf {
47      /**
48       * Adds a Field to the RdbExpQueryLeaf
49       * @param fieldName is the name of the Field to be added.
50       * @param type is the PTyme of the Field to be added.
51       * @param nameInQuery is the name of the column in the associated
52       * QualifiedTable.
53       * @return the created RdbExpField.
54       */
55      RdbField addRdbField(String   fieldName,
56                           PType type,
57                           String   nameInQuery);
58  
59  }
60
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