base methods

CoNaObiadDbHelper.java

public class CoNaObiadDbHelper extends SQLiteOpenHelper {

    public static final int DATABASE_VERSION = 2;
    public static final String DATABASE_NAME = "CoNaObiad.db";

    public static final String TABLE_NAME = "meal";
    public static final String COLUMN_NAME_NAME = "name";
    public static final String COLUMN_NAME_ID = "_id";

    private static final String SQL_CREATE_ENTRIES =
            "CREATE TABLE " + TABLE_NAME + " (" +
                    COLUMN_NAME_ID + " INTEGER PRIMARY KEY," +
                    COLUMN_NAME_NAME + " TEXT)";

    private static final String SQL_DROP_TABLE = "DROP TABLE IF EXISTS " + TABLE_NAME;

    private static final String SQL_DELETE_ENTRIES = "DELETE FROM " + TABLE_NAME;


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

    @Override
    public void onCreate(SQLiteDatabase db) {
        db.execSQL(SQL_CREATE_ENTRIES);
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        db.execSQL(SQL_DROP_TABLE);
        onCreate(db);
    }

    @Override
    public void onDowngrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        db.execSQL(SQL_DROP_TABLE);
        onCreate(db);
    }

    public void cleanData() {
        SQLiteDatabase db = this.getWritableDatabase();
        db.execSQL(SQL_DELETE_ENTRIES);
    }

}