/*
 * Copyright 2020-2022 the original author.All rights reserved.
 * Kingstar(honeysoft@126.com)
 * 
 * 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.
 */

package org.teasoft.bee.android;

/**
 * Create and Upgrade.
 * @author Kingstar
 * @since  1.17
 */
public interface CreateAndUpgrade {

	/**
	 * Called when the database is created for the first time. This is where the
	 * creation of tables and the initial population of the tables should happen.
	 */
	public void onCreate();

	/**
	 * Called when the database needs to be upgraded. The implementation
	 * should use this method to drop tables, add tables, or do anything else it
	 * needs to upgrade to the new schema version.
	 *
	 * <p>If you add new columns you can use ALTER TABLE to insert them into a live table. 
	 * If you rename or remove columns you can use ALTER TABLE to rename the old table, 
	 * then create the new table and then populate the new table with the contents of the old table.
	 * </p><p>
	 * This method executes within a transaction.  If an exception is thrown, all changes
	 * will automatically be rolled back.
	 * </p>
	 *
	 * @param oldVersion The old database version.
	 * @param newVersion The new database version.
	 */
	public void onUpgrade(int oldVersion, int newVersion);

}
