Question

I am creating an android application that requires me to call is in different classes. i have set up my database like this:

public class DataBaseHelper {

private static final String DATABASE_NAME = "example.db";
private static final int DATABASE_VERSION = 1;
private static final String TABLE_NAME = "table1";

private Context context;
private SQLiteDatabase db;

private SQLiteStatement insertStmt;
private static final String INSERT = "insert into "+ TABLE_NAME + "(name) values   (?)";

    public DataBaseHelper(Context context) {
       this.context = context;
       OpenHelper openHelper = new OpenHelper(this.context);
       this.db = openHelper.getWritableDatabase();
       this.insertStmt = this.db.compileStatement(INSERT);
    }

    public long insert(String name) {
       this.insertStmt.bindString(1, name);
       return this.insertStmt.executeInsert();
    }

    public void deleteAll() {
       this.db.delete(TABLE_NAME, null, null);
    }

    public List<String> selectAll() {
      List<String> list = new ArrayList<String>();
      Cursor cursor = this.db.query(TABLE_NAME, new String[] { "name" },
      null, null, null, null, "name desc");
      if (cursor.moveToFirst()) {
      do {
        list.add(cursor.getString(0));
      } while (cursor.moveToNext());
     }
     if (cursor != null && !cursor.isClosed()) {
      cursor.close();
     }
     return list;
   }

   private static class OpenHelper extends SQLiteOpenHelper {

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

   @Override
   public void onCreate(SQLiteDatabase db) {
      db.execSQL("CREATE TABLE " + TABLE_NAME + "(id INTEGER PRIMARY KEY, name TEXT)");
   }

   @Override
   public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
     Log.w("Example", "Upgrading database, this will drop tables and recreate.");
     db.execSQL("DROP TABLE IF EXISTS " + TABLE_NAME);
     onCreate(db);
   }
  }
}

if i was to call this in a different class how would i go about doing it. and would i need to change this class any?

Answer 1

this is simple,,jst create object of DB class and use that method..like.

DataBaseHelper db=new DataBaseHelper(this) ;
db.insert("HellooAndroid");
db.deleteAll();

See this Link for more Reference:

How to write reusable code for Database in Android