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JDBC Driver for the Firebird RDBMS
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/*
 * $Id$
 * 
 * Firebird Open Source J2ee connector - jdbc driver, public Firebird-specific 
 * JDBC extensions.
 *
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions are met:
 *    1. Redistributions of source code must retain the above copyright notice, 
 *       this list of conditions and the following disclaimer.
 *    2. Redistributions in binary form must reproduce the above copyright 
 *       notice, this list of conditions and the following disclaimer in the 
 *       documentation and/or other materials provided with the distribution. 
 *    3. The name of the author may not be used to endorse or promote products 
 *       derived from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO 
 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.firebirdsql.jdbc;

import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

/**
 * Firebird-specific extensions to the {@link Statement} interface.
 * 
 * @author Roman Rokytskyy
 */
public interface FirebirdStatement extends Statement {
    
    /**
     * Get number of inserted rows. You can call this method multiple times,
     * it does not affect the JDBC result number.
     * 
     * @return number of inserted rows or -1 if current result is result set.
     * 
     * @throws SQLException if database error occurs.
     */
	int getInsertedRowsCount() throws SQLException;
    
    /**
     * Get number of updated rows. You can call this method multiple times,
     * it does not affect the JDBC result number.
     * 
     * @return number of updated rows or -1 if current result is result set.
     * 
     * @throws SQLException if database error occurs.
     */
    int getUpdatedRowsCount() throws SQLException;
    
    /**
     * Get number of deleted rows. You can call this method multiple times,
     * it does not affect the JDBC result number.
     * 
     * @return number of deleted rows or -1 if current result is result set.
     * 
     * @throws SQLException if database error occurs.
     */
    int getDeletedRowsCount() throws SQLException;
    
    /**
     * Check if this statement has open result set. Note, this method works
     * correctly if auto-commit is disabled. In auto-commit mode it will always
     * return false because from the statement's point of view
     * result set is not open (in auto-commit mode complete result set is fetched
     * and cached in wrapping object before returning from the 
     * {@link #getResultSet()} method).
     * 
     * @return true if there's already open result set associated
     * with this statement, otherwise false.
     */
    boolean hasOpenResultSet();
    
    /**
     * Get current result set. Behaviour of this method is similar to the 
     * behavior of the {@link Statement#getResultSet()}, except that this method
     * can be called as much as you like.
     * 
     * @return instance of {@link ResultSet} representing current result set
     * or null if it is not available.
     * 
     * @throws SQLException if database access error happened.
     */
    ResultSet getCurrentResultSet() throws SQLException;
    
    /**
     * Check if this statement is valid.
     * 
     * @return true if statement is valid and can be used to 
     * execute SQL.
     */
    boolean isValid();
    
    /**
     * Get execution plan for the last executed statement. Unlike the 
     * {@link FirebirdPreparedStatement#getExecutionPlan()}, this method can be
     * called only after executing a query or update statement. 
     * 
     * @return execution plan returned by the server.
     * 
     * @throws SQLException if no statement was executed before calling this 
     * method, statement is not valid, or there was an error when obtaining
     * the execution plan.
     */
    String getLastExecutionPlan() throws SQLException;
    
    /**
     * Retrieves whether this Statement object has been closed. A Statement is closed if the
     * method close has been called on it, or if it is automatically closed.
     * 
     * Provided here for compatibility with Java 5
     * 
     * @return true if this Statement object is closed; false if it is still open
     * @throws SQLException if a database access error occurs
     */
    boolean isClosed() throws SQLException;
}