Android Open Source - Sunshine Weather Db Helper

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License

The source code is released under:

Apache License

Java Source Code

package br.com.santhyago.udacity.sunshine.app.data;
/* w ww.j av  a2s.  c o m*/
import android.content.Context;
import android.database.DatabaseErrorHandler;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import br.com.santhyago.udacity.sunshine.app.data.WeatherContract.WeatherEntry;
import br.com.santhyago.udacity.sunshine.app.data.WeatherContract.LocationEntry;


/**
 * Created by san on 11/23/14.
 */
public class WeatherDbHelper extends SQLiteOpenHelper {

  private static final int DATABASE_VERSION = 1;
  public static final String DATABASE_NAME = "weather.db";

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

  public WeatherDbHelper(Context context, String name, SQLiteDatabase.CursorFactory factory, int version) {
    super(context, DATABASE_NAME, null, DATABASE_VERSION);
  }

  public WeatherDbHelper(Context context, String name, SQLiteDatabase.CursorFactory factory, int version, DatabaseErrorHandler errorHandler) {
    super(context, name, factory, version, errorHandler);
  }

  @Override
  public void onCreate(SQLiteDatabase db) {
    // Create a table to hold locations.  A location consists of the string supplied in the
    // location setting, the city name, and the latitude and longitude

    final String SQL_CREATE_LOCATION_TABLE = "CREATE TABLE " + LocationEntry.TABLE_NAME + " (" +
        LocationEntry._ID + " INTEGER PRIMARY KEY," +
        LocationEntry.COLUMN_LOCATION_SETTING + " TEXT UNIQUE NOT NULL, " +
        LocationEntry.COLUMN_CITY_NAME + " TEXT NOT NULL, " +
        LocationEntry.COLUMN_COORD_LAT + " REAL NOT NULL, " +
        LocationEntry.COLUMN_COORD_LONG + " REAL NOT NULL, " +
        "UNIQUE (" + LocationEntry.COLUMN_LOCATION_SETTING +") ON CONFLICT IGNORE"+
        " );";

    final String SQL_CREATE_WEATHER_TABLE = "CREATE TABLE " + WeatherEntry.TABLE_NAME + " (" +
        // Why AutoIncrement here, and not above?
        // Unique keys will be auto-generated in either case.  But for weather
        // forecasting, it's reasonable to assume the user will want information
        // for a certain date and all dates *following*, so the forecast data
        // should be sorted accordingly.
        WeatherEntry._ID + " INTEGER PRIMARY KEY AUTOINCREMENT," +

        // the ID of the location entry associated with this weather data
        WeatherEntry.COLUMN_LOC_KEY + " INTEGER NOT NULL, " +
        WeatherEntry.COLUMN_DATETEXT + " TEXT NOT NULL, " +
        WeatherEntry.COLUMN_SHORT_DESC + " TEXT NOT NULL, " +
        WeatherEntry.COLUMN_WEATHER_ID + " INTEGER NOT NULL," +

        WeatherEntry.COLUMN_MIN_TEMP + " REAL NOT NULL, " +
        WeatherEntry.COLUMN_MAX_TEMP + " REAL NOT NULL, " +

        WeatherEntry.COLUMN_HUMIDITY + " REAL NOT NULL, " +
        WeatherEntry.COLUMN_PRESSURE + " REAL NOT NULL, " +
        WeatherEntry.COLUMN_WIND_SPEED + " REAL NOT NULL, " +
        WeatherEntry.COLUMN_DEGREES + " REAL NOT NULL, " +

        // Set up the location column as a foreign key to location table.
        " FOREIGN KEY (" + WeatherEntry.COLUMN_LOC_KEY + ") REFERENCES " +
        LocationEntry.TABLE_NAME + " (" + LocationEntry._ID + "), " +

        // To assure the application have just one weather entry per day
        // per location, it's created a UNIQUE constraint with REPLACE strategy
        " UNIQUE (" + WeatherEntry.COLUMN_DATETEXT + ", " +
        WeatherEntry.COLUMN_LOC_KEY + ") ON CONFLICT REPLACE);";

    db.execSQL(SQL_CREATE_LOCATION_TABLE);
    db.execSQL(SQL_CREATE_WEATHER_TABLE);
  }

  @Override
  public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
    // This database is only a cache for online data, so its upgrade policy is
    // to simply to discard the data and start over
    // Note that this only fires if you change the version number for your database.
    // It does NOT depend on the version number for your application.
    // If you want to update the schema without wiping data, commenting out the next 2 lines
    // should be your top priority before modifying this method.
    db.execSQL("DROP TABLE IF EXISTS " + LocationEntry.TABLE_NAME);
    db.execSQL("DROP TABLE IF EXISTS " + WeatherEntry.TABLE_NAME);
    onCreate(db);

  }
}

Java Source Code List

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