content: /*
   *    This program is free software; you can redistribute it and/or modify
   *    it under the terms of the GNU General Public License as published by
   *    the Free Software Foundation; either version 2 of the License, or
   *    (at your option) any later version.
   *
   *    This program is distributed in the hope that it will be useful,
   *    but WITHOUT ANY WARRANTY; without even the implied warranty of
   *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   *    GNU General Public License for more details.
   *
   *    You should have received a copy of the GNU General Public License
   *    along with this program; if not, write to the Free Software
   *    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
   */
  
  /*
   *    DatabaseConnection.java
   *    Copyright (C) 2004 University of Waikato, Hamilton, New Zealand
   *
   */
  
  package weka.core.converters;
  
  import weka.core.RevisionUtils;
  import weka.experiment.DatabaseUtils;
  
  import java.io.File;
  import java.sql.DatabaseMetaData;
  import java.sql.SQLException;
  import java.util.Properties;
  
  /**
   * Connects to a database.
   *
   * @author Len Trigg (trigg@cs.waikato.ac.nz)
   * @author Stefan Mutter (mutter@cs.waikato.ac.nz)
   * @version $Revision: 7485 $
   */
  public class DatabaseConnection 
    extends DatabaseUtils {
  
    /** for serialization */
    static final long serialVersionUID = 1673169848863178695L;
    
    /**
     * Sets up the database drivers.
     *
     * @throws Exception if an error occurs
     */
    public DatabaseConnection() throws Exception {
      super();
    }
    
    /**
     * Reads the properties from the specified file and sets up the database drivers.
     *
     * @param propsFile	the props file to load, ignored if null or pointing 
     * 			to a directory
     * @throws Exception 	if an error occurs
     */
    public DatabaseConnection(File propsFile) throws Exception {
      super(propsFile);
    }
    
    /**
     * Uses the specified properties to set up the database drivers.
     *
     * @param props	the properties to use, ignored if null
     * @throws Exception 	if an error occurs
     */
    public DatabaseConnection(Properties props) throws Exception {
      super(props);
    }
  
    /**
     * Returns the underlying properties object.
     * 
     * @return		the properties object
     */
    public Properties getProperties() {
      return PROPERTIES;
    }
    
    /** 
     * Check if the property checkUpperCaseNames in the DatabaseUtils file is 
     * set to true or false.
     *
     * @return  	true if the property checkUpperCaseNames in the DatabaseUtils 
     * 		file is set to true, false otherwise.
     */
    public boolean getUpperCase(){
      return m_checkForUpperCaseNames;
    }
    
    /**
     * Gets meta data for the database connection object.
     *
     * @return the meta data.
     * @throws Exception if an error occurs
     */
    public DatabaseMetaData getMetaData() throws Exception{
      if (!isConnected())
        throw new IllegalStateException("Not connected, please connect first!");
      
      return m_Connection.getMetaData();
    }
    
    /**
     * Dewtermines if the current query retrieves a result set or updates a table
     *
     * @return the update count (-1 if the query retrieves a result set).
     * @throws SQLException if an error occurs
     */
    public int getUpdateCount() throws SQLException {
      if (!isConnected())
        throw new IllegalStateException("Not connected, please connect first!");
      
      return m_PreparedStatement.getUpdateCount();
    }
    
    /**
     * Returns the revision string.
     * 
     * @return		the revision
     */
    public String getRevision() {
      return RevisionUtils.extract("$Revision: 7485 $");
    }
  }
  