Question

I want to populate a listview from 2 tables in SQLite database. The listview will consist of 3views: an imageview and 2 textviews.

• 1st table: imageview and textview1
• 2nd table: textview2

I can successfully query data from one table and display it in a listview, but have no idea how to query from the 2nd one, then add it to the list.

The codes below displays a listview with data only from my_folders.
How can I change it such that textview1 shows data from table my_folders and textview2 shows data from my_expenses. Can anyone please help?

This is mymain:

public class mymain extends ListActivity {
ListView listContent;

SimpleCursorAdapter cursorAdapter;
final DBAdapter mySQLiteAdapter = new DBAdapter(this);
Cursor cursor;

/** Called when the activity is first created. */

@Override
public void onCreate(Bundle savedInstanceState) {

  super.onCreate(savedInstanceState);

// setContentView(R.layout.list_example);

  listContent = (ListView) findViewById(R.id.custom_list);
  final DBAdapter mySQLiteAdapter = new DBAdapter(this);

  mySQLiteAdapter.open();

  cursor = mySQLiteAdapter.getAllFolders();

  String[] from = new String[] { DBAdapter.KEY_NAME,DBAdapter.KEY_CURRENCY };
  int[] to = new int[] { R.id.name_row, R.id.notes_row };


  cursorAdapter = new SimpleCursorAdapter(this, R.layout.list_row, cursor,
          from, to);

  setListAdapter(cursorAdapter);
  mySQLiteAdapter.close();

}
}

This my database:

import android.database.Cursor;

public class DBAdapter {
    public static final String KEY_ROWID = "_id"; 
    public static final String KEY_NAME = "name";
    public static final String KEY_CURRENCY = "currency";
    public static final String KEY_NOTES = "notes";
    public static final String KEY_EXPENSE_NAME = "expense_name";
    public static final String KEY_EXPENSE_AMOUNT = "expense_amount";
    public static final String KEY_EXPENSE_DATE = "expense_date";
    public static final String KEY_EXPENSE_TIME = "expense_time";
    public static final String KEY_EXPENSE_NOTES = "expense_notes";
    public static final String KEY_EFOLDERID = "e_fid";

    private static final String TAG = "DBAdapter";

    private static final String DATABASE_NAME = "MyDB";
    private static final String DATABASE_TABLE1 = "my_folders";
    private static final String DATABASE_TABLE2 = "my_expenses";
    private static final int DATABASE_VERSION = 1;

    private static final String DATABASE_CREATE_FOLDERS = 
        "create table my_folders (_id integer primary key autoincrement, "
            + "name text not null, currency text not null, notes text);";

    private static final String DATABASE_CREATE_EXPENSES = 
        "create table my_expenses (_id integer primary key autoincrement, "
            + "expense_name text not null, expense_amount real not null, " +
                    "expense_date text not null, expense_time text not null," +
                    "expense_notes text,"
        + "e_fid integer not null," +
                    "FOREIGN KEY ("+ KEY_EFOLDERID+ ") REFERENCES " + DATABASE_TABLE1 +" ("+ >KEY_ROWID + ") ON DELETE CASCADE);";

    // ---retrieves all the contacts---
    public Cursor getAllFolders() {
        return db.query(DATABASE_TABLE1, new String[] { KEY_ROWID, KEY_NAME,
                KEY_CURRENCY, KEY_NOTES}, null, null, null, null, null);
    }

    // ---retrieves all the expenses---
    public Cursor getAllExpenses() {
        return db.query(DATABASE_TABLE2, new String[] { KEY_ROWID, KEY_EXPENSE_NAME,
                KEY_EXPENSE_AMOUNT, KEY_EXPENSE_DATE, KEY_EXPENSE_TIME, KEY_EXPENSE_NOTES, >KEY_EFOLDERID}, null, null, null, null, null);
    }

Answer 1

The best way to get the data from the 2 tables is to use a join query, something like

SELECT name, expense_name, expense_notes
FROM my_folders, my_expenses
WHERE my_folders._id = my_folders.e_fid

This will return all the data in 1 Cursor and which you can then put in your view