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Android Android Data Persistence Migrating a SQLite Database Adding a New Field

We have an app used to track all known alien races. We are going to release a new version that allows users to select a

We have an app used to track all known alien races. We are going to release a new version that allows users to select a home planet as well. Start by incrementing the version of the database

AlienSQLiteHelper.java
public class AlienSQLiteHelper extends SQLiteOpenHelper {

  public static final String DB_NAME = "aliens.db";
  public static final int DB_VERSION = 2;

  public static final String ALIENS_TABLE = "ALIENS";
  public static final String COLUMN_NAME = "NAME";
  public static final String COLUMN_TYPE = "TYPE";

  public static final String CREATE_ALIENS = "CREATE TABLE " + ALIENS_TABLE + " (" +
          "_id INTEGER PRIMARY KEY AUTOINCREMENT," +
          COLUMN_NAME + " TEXT, " +
          COLUMN_TYPE + " TEXT)";

  public static final String DB_ALTER = "ALTER TABLE " + ALIENS_TABLE + " ADD COLUMN ";

  public AlienSQLiteHelper(Context context) {
    super(context, DB_NAME, null, DB_VERSION);
  }

  @Override
  public void onCreate(SQLiteDatabase sqLiteDatabase) {
    sqLiteDatabase.execSQL(CREATE_ALIENS);
  }

  @Override
  public void onUpgrade(SQLiteDatabase database, int oldVersion, int newVersion) {
    switch (oldVersion) {
      case 1:sqLiteDatabase.execSQL(DB_ALTER);

    }
  }
}
House Trigo
House Trigo
36,620 Points

Where's your home planet column?

1 Answer

Which challenge can you not solve? Notice in the last method you are using sqLiteDatabase, which is out of scope for this method. You should use database.execSQL(DB_ALTER)