DatabaseHelper.java

package org.rudirect.android.database;

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 org.rudirect.android.data.model.BusData;

import java.sql.SQLException;

/**
 * Database helper class used to manage the creation and upgrading of your database. This class also
 * provides the DAOs used by the other classes.
 */
public class DatabaseHelper extends OrmLiteSqliteOpenHelper {

    private static final String TAG = DatabaseHelper.class.getSimpleName();
    private static final String DATABASE_NAME = "RUDirect.db";
    private static final int DATABASE_VERSION = 3;

    private Dao<BusData, Integer> busDataDao = null;

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

    /**
     * This is called when the database is first created. Usually you should call createTable statements
     * here to create the tables that will store your data.
     */
    @Override
    public void onCreate(SQLiteDatabase db, ConnectionSource connectionSource) {
        try {
            Log.i(TAG, "onCreate");
            TableUtils.createTable(connectionSource, BusData.class);
        } catch (SQLException e) {
            Log.e(TAG, "Can't create database", e);
            throw new RuntimeException(e);
        }
    }

    /**
     * This is called when your application is upgraded and it has a higher version number. This allows
     * you to adjust the various data to match the new version number.
     */
    @Override
    public void onUpgrade(SQLiteDatabase db, ConnectionSource connectionSource, int oldVersion, int newVersion) {
        try {
            Log.i(TAG, "onUpgrade");
            TableUtils.dropTable(connectionSource, BusData.class, true);
            // after we drop the old databases, we create the new ones
            onCreate(db, connectionSource);
        } catch (SQLException e) {
            Log.e(TAG, "Can't drop databases", e);
            throw new RuntimeException(e);
        }
    }

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

    /**
     * Close the database connections and clear any cached DAOs.
     */
    @Override
    public void close() {
        super.close();
        busDataDao = null;
    }
}