jdbchelperfactory.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 org.apache.log4j.Category;


/**
 * Use of this class or is <i>not</i> required by the framework.  This class
 * is used by the AbstractDomain superclass only when it has not been given
 * the appropriate JDBCHelper information.
 *
 * <p>This class keeps the JDBCHelper creation logic in one place.
 */
public class JDBCHelperFactory
  {

  private static final Category LOG =
                Category.getInstance(JDBCHelperFactory.class.getName());

  /**
   * Create and return a new JDBCHelper instance.
   *
   * @return a value of type 'JDBCHelper'
   */
  public static JDBCHelper create()
    {
    try
        {
        JDBCHelper helper = null;
        String dataSourceName = JRFProperties.getProperty("dataSourceName");
        if(dataSourceName != null && dataSourceName.length() > 0)
            {
            helper = new JDBCHelper(dataSourceName);
            }
        else
            {
            helper = new JDBCHelper(
                JRFProperties.getProperty("driver"),
                JRFProperties.getProperty("url"),
                JRFProperties.getProperty("user"),
                JRFProperties.getProperty("password"));
            }

        // This should be true if transactions are tied to statements, but
        // the default is false.
        boolean reuseStatement =
                JRFProperties.propertyIsTrue("reuseStatement");
        helper.setReuseStatement(reuseStatement);

        return helper;
        }
    catch (RuntimeException e)
        {
        LOG.error(
            "RuntimeException occured while creating JDBCHelper.", e);
        throw (RuntimeException) e.fillInStackTrace();
        }
    catch (Exception e)
        {
        LOG.error(
            "Exception occured while creating JDBCHelper.", e);
        throw new RuntimeException(e.getMessage());
        }
    } // create()


  } // JDBCHelperFactory