/*
 * @(#)RowSetInternal.java	1.8 03/01/23
 *
 * Copyright 2003 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */

package javax.sql;

import java.sql.*;

/**
 * The interface that a <code>RowSet</code> object implements in order to 
 * present itself to a <code>RowSetReader</code> or <code>RowSetWriter</code>
 * object. The <code>RowSetInternal</code> interface contains 
 * methods that let the reader or writer access and modify the internal
 * state of the rowset.
 *
 * @since 1.4
 */

public interface RowSetInternal {

  /**
   * Retrieves the parameters that have been set for this
   * <code>RowSet</code> object's command.
   *
   * @return an array of the current parameter values for this <code>RowSet</code>
   *         object's command 
   * @exception SQLException if a database access error occurs
   */
  Object[] getParams() throws SQLException;

  /**
   * Retrieves the <code>Connection</code> object that was passed to this
   * <code>RowSet</code> object.
   *
   * @return the <code>Connection</code> object passed to the rowset 
   *      or <code>null</code> if none was passed
   * @exception SQLException if a database access error occurs
   */
  Connection getConnection() throws SQLException;

  /**    
   * Sets the given <code>RowSetMetaData</code> object as the
   * <code>RowSetMetaData</code> object for this <code>RowSet</code>
   * object. The <code>RowSetReader</code> object associated with the rowset 
   * will use <code>RowSetMetaData</code> methods to set the values giving
   * information about the rowset's columns.
   *
   * @param md the <code>RowSetMetaData</code> object that will be set with
   *        information about the rowset's columns
   * 
   * @exception SQLException if a database access error occurs
   */
  void setMetaData(RowSetMetaData md) throws SQLException;

  /** 
   * Retrieves a <code>ResultSet</code> object containing the original
   * value of this <code>RowSet</code> object.
   * <P>
   * The cursor is positioned before the first row in the result set.
   * Only rows contained in the result set returned by the method
   * <code>getOriginal</code> are said to have an original value.
   *
   * @return the original value of the rowset
   * @exception SQLException if a database access error occurs
   */
  public ResultSet getOriginal() throws SQLException;

  /**
   * Retrieves a <code>ResultSet</code> object containing the original value
   * of the current row only.  If the current row has no original value,
   * an empty result set is returned. If there is no current row,
   * an exception is thrown.
   *
   * @return the original value of the current row as a <code>ResultSet</code>
   *          object
   * @exception SQLException if a database access error occurs or this method
   *           is called while the cursor is on the insert row, before the 
   *           first row, or after the last row
   */
  public ResultSet getOriginalRow() throws SQLException;

}