DataBaseHelper.java

/*
 * Copyright (C) 2015 The Android Open Source Project
 *
 * 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 com.vinidsl.googleioextended.helper;

import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.util.Log;

import com.j256.ormlite.android.apptools.OrmLiteSqliteOpenHelper;
import com.j256.ormlite.dao.Dao;
import com.j256.ormlite.support.ConnectionSource;
import com.j256.ormlite.table.TableUtils;
import com.vinidsl.googleioextended.model.Speaker;
import com.vinidsl.googleioextended.model.Talk;

import java.sql.SQLException;

/**
 * Created by Vinicius on 09-06-15.
 */
public class DataBaseHelper  extends OrmLiteSqliteOpenHelper {

    // name of the database file for your application -- change to something appropriate for your app
    private static final String DATABASE_NAME = "GdgBoliviaExtended.db";
    // any time you make changes to your database objects, you may have to increase the database version
    private static final int DATABASE_VERSION = 1;

    // the DAO object we use to access the SimpleData table
    private Dao<Talk,String> talkDao = null;
    private Dao<Speaker, String> speakerDao = null;

    public DataBaseHelper(Context context) {
        super(context, DATABASE_NAME, null, DATABASE_VERSION);
    }

    @Override
    public void onCreate(SQLiteDatabase sqLiteDatabase, ConnectionSource connectionSource) {
        try{
            TableUtils.createTableIfNotExists(connectionSource, Speaker.class);
            Log.i(DataBaseHelper.class.getName(), "created speaker table");
            TableUtils.createTableIfNotExists(connectionSource, Talk.class);
            Log.i(DataBaseHelper.class.getName(), "created talk table");
        } catch (SQLException e) {
            Log.e(DataBaseHelper.class.getName(), "Can't create database", e);
            throw new RuntimeException(e);
        }
    }

    @Override
    public void onUpgrade(SQLiteDatabase sqLiteDatabase, ConnectionSource connectionSource, int i, int i1) {
        try{
            TableUtils.dropTable(connectionSource, Talk.class, true);
            TableUtils.dropTable(connectionSource, Speaker.class, true);
            // after we drop the old databases, we create the new ones
            onCreate(sqLiteDatabase, connectionSource);
        } catch (SQLException e) {
            Log.e(DataBaseHelper.class.getName(), "Can't drop databases", e);
            throw new RuntimeException(e);
        }
    }
    /**
     * Close the database connections and clear any cached DAOs.
     */
    @Override
    public void close() {
        super.close();
        talkDao = null;
        speakerDao = null;
    }

    /**
     * Returns the Database Access Object (DAO) for our SimpleData class. It will create it or just give the cached
     * value.
     */
    public Dao<Talk, String> getTalkDao() throws SQLException {
        if (talkDao == null) {
            talkDao = getDao(Talk.class);
        }
        return talkDao;
    }

    public Dao<Speaker, String> getSpeakerDao() throws SQLException {
        if (speakerDao == null) {
            speakerDao = getDao(Speaker.class);
        }
        return speakerDao;
    }
}