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/**
 *  Copyright (c) 1997-2013, www.tinygroup.org ([email protected]).
 *
 *  Licensed under the GPL, Version 3.0 (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.gnu.org/licenses/gpl.html
 *
 *  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.
 */
package org.tinygroup.tinydb.dialect.impl;

import org.springframework.dao.DataAccessException;
import org.springframework.dao.DataAccessResourceFailureException;
import org.springframework.jdbc.datasource.DataSourceUtils;
import org.springframework.jdbc.support.JdbcUtils;

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

@Deprecated
public abstract class AbstractSequenceDialcet extends AbstractDialect {
	/**
	 * Executes the SQL as specified by {@link #getSequenceQuery()}.
	 */
	public int getNextKey() throws DataAccessException {
		Connection con = DataSourceUtils.getConnection(getDataSource());
		Statement stmt = null;
		ResultSet rs = null;
		try {
			stmt = con.createStatement();
			DataSourceUtils.applyTransactionTimeout(stmt, getDataSource());
			rs = stmt.executeQuery(getSequenceQuery());
			if (rs.next()) {
				return rs.getInt(1);
			}
			else {
				throw new DataAccessResourceFailureException("Sequence query did not return a result");
			}
		}
		catch (SQLException ex) {
			throw new DataAccessResourceFailureException("Could not obtain sequence value", ex);
		}
		finally {
			JdbcUtils.closeResultSet(rs);
			JdbcUtils.closeStatement(stmt);
			DataSourceUtils.releaseConnection(con, getDataSource());
		}
	}

	/**
	 * Return the database-specific query to use for retrieving a sequence value.
	 * The provided SQL is supposed to result in a single row with a single
	 * column that allows for extracting a long value.
	 */
	protected abstract String getSequenceQuery();

}