for #647 ResultSetMergerInput => QueryResult

/*

 * Copyright 1999-2015 dangdang.com.

 * <p>

 * Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 * </p>

 */

package io.shardingjdbc.core.merger;

import java.sql.SQLException;

/**

 * Query result form database.

 *

 * @author zhangliang

 */

public interface QueryResult extends ResultSetMerger {

    /**

     * Get column count.

     * 

     * @return column count

     * @throws SQLException SQL Exception

     */

    int getColumnCount() throws SQLException;

    /**

     * Get column label.

     * 

     * @param columnIndex column index

     * @return column label

     * @throws SQLException SQL Exception

     */

    String getColumnLabel(int columnIndex) throws SQLException;

}