floatjoincolumn.java

把java对象映射成数据库表中的一条记录

/*
 *
 * The contents of this file are subject to the Mozilla Public License
 * Version 1.1 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 *
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
 * License for the specific language governing rights and limitations under
 * the License.
 *
 * The Original Code is jRelationalFramework.
 *
 * The Initial Developer of the Original Code is is.com.
 * Portions created by is.com are Copyright (C) 2000 is.com.
 * All Rights Reserved.
 *
 * Contributor(s): Jonathan Carlson ([e-mail])
 * Contributor(s): ____________________________________
 *
 * Alternatively, the contents of this file may be used under the terms of
 * the GNU General Public License (the "GPL") or the GNU Lesser General
 * Public license (the "LGPL"), in which case the provisions of the GPL or
 * LGPL are applicable instead of those above.  If you wish to allow use of
 * your version of this file only under the terms of either the GPL or LGPL
 * and not to allow others to use your version of this file under the MPL,
 * indicate your decision by deleting the provisions above and replace them
 * with the notice and other provisions required by either the GPL or LGPL
 * License.  If you do not delete the provisions above, a recipient may use
 * your version of this file under either the MPL or GPL or LGPL License.
 *
 */
package com.is.jrf;

import com.is.util.sql.JDBCHelper;

import java.sql.SQLException;


/**
 *  This subclass of JoinColumn represents an Float column we want joined
 *  from another table.
 */
public class FloatJoinColumn
    extends JoinColumn
  {

  /* ===============  Static Variables  =============== */

  protected static Class s_class = Float.class;


  /* ===============  Constructors  =============== */

  /**
   * Construct an instance that is ready to be used.
   *
   * @param columnName a value of type 'String' - can include the alias
   *                   like this: "Name PersonName"
   * @param setterName a value of type 'String'
   */
  public FloatJoinColumn(
      String columnName,
      String setterName)
    {
    super(columnName,
          setterName);
    }

  /**
   * Construct an instance that is ready to be used.
   *
   * @param columnName a value of type 'String'
   * @param columnAlias a value of type 'String'
   * @param setterName a value of type 'String'
   */
  public FloatJoinColumn(
      String columnName,
      String columnAlias,
      String setterName)
    {
    super(columnName,
          columnAlias,
          setterName);
    }


  /**
   * This is usually overridden by subclasses to explicitly specify the type
   * of object to be retrieved from the result set in JDBCHelper.
   *
   * @param helper a value of type 'JDBCHelper'
   * @return a value of type 'Object'
   * @exception SQLException if an error occurs
   */
  public Object getColumnValueFrom(JDBCHelper helper)
          throws SQLException
    {
    return helper.getFloat(i_columnAlias);
    }


  public Class getColumnClass()
    {
    return s_class;
    }


  } // FloatJoinColumn