Android Open Source - geocamTalkAndroid Database Helper

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License

The source code is released under:

NASA OPEN SOURCE AGREEMENT VERSION 1.3 THIS OPEN SOURCE AGREEMENT ("AGREEMENT") DEFINES THE RIGHTS OF USE, REPRODUCTION, DISTRIBUTION, MODIFICATION AND REDISTRIBUTION OF CERTAIN COMPUTER SOFTWARE ORI...

Java Source Code

// __BEGIN_LICENSE__
// Copyright (C) 2008-2010 United States Government as represented by
// the Administrator of the National Aeronautics and Space Administration.
// All Rights Reserved.
// __END_LICENSE__
/* w  w  w. j  av a  2s .c om*/
package gov.nasa.arc.geocam.talk.service;

import gov.nasa.arc.geocam.talk.bean.GeoCamTalkMessage;

import java.sql.SQLException;

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

import com.google.inject.Inject;
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;

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

  /** name of the database file for your application */
  private static final String DATABASE_NAME = "geocamTalk.db";

  /** any time you make changes to your database objects, you may have to
  increase the database version */
  private static final int DATABASE_VERSION = 6;
  
  /** the DAO object we use to access the SimpleData table */
  private Dao<GeoCamTalkMessage, Integer> simpleDao = null;

  /**
   * Instantiates a new database helper.
   *
   * @param context the context
   */
  @Inject
  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.
   *
   * @param db the db
   * @param connectionSource the connection source
   */
  @Override
  public void onCreate(SQLiteDatabase db, ConnectionSource connectionSource) {
    try {
      Log.i(DatabaseHelper.class.getName(), "onCreate");
      TableUtils.createTable(connectionSource, GeoCamTalkMessage.class);
    } catch (SQLException e) {
      Log.e(DatabaseHelper.class.getName(), "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.
   *
   * @param db the db
   * @param connectionSource the connection source
   * @param oldVersion the old version
   * @param newVersion the new version
   */
  @Override
  public void onUpgrade(SQLiteDatabase db, ConnectionSource connectionSource, int oldVersion,
      int newVersion) {
    try {
      Log.i(DatabaseHelper.class.getName(), "onUpgrade");
      TableUtils.dropTable(connectionSource, GeoCamTalkMessage.class, true);
      // after we drop the old databases, we create the new ones
      onCreate(db, connectionSource);
    } catch (SQLException e) {
      Log.e(DatabaseHelper.class.getName(), "Can't drop databases", e);
      throw new RuntimeException(e);
    }
  }

  /**
   * Returns the Database Access Object (DAO) for our SimpleData class. It
   * will create it or just give the cached value.
   *
   * @return the geo cam talk message dao
   * @throws SQLException the sQL exception
   */
  @Override
  public Dao<GeoCamTalkMessage, Integer> getGeoCamTalkMessageDao() throws SQLException {
    if (simpleDao == null) {
      simpleDao = getDao(GeoCamTalkMessage.class);
    }
    return simpleDao;
  }

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

Java Source Code List

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