Android and SQLite - retrieve max id from table

Question

I am trying to create method to retrieve the max id from my table but I've problem.

This is my method. It's working, but return value is 0,

public int getLastId() {
    openDB();
    int id = 0;
    final String MY_QUERY = "SELECT MAX(_id) AS _id FROM organize";
    Cursor mCursor = mDb.rawQuery(MY_QUERY, null);  
    try {
          if (mCursor.getCount() > 0) {
            mCursor.moveToFirst();
            id = mCursor.getInt(mCursor.getColumnIndex(MY_QUERY));
          }
        } catch (Exception e) {
          System.out.println(e.getMessage());
        } finally {
            closeDB();
        }
return id;

}

can I fix this problem, thanks a lot

Answer 1

Rewrite this line

id = mCursor.getInt(mCursor.getColumnIndex(MY_QUERY));

to

id = mCursor.getInt(mCursor.getColumnIndex("_id"));  

or better to

id = mCursor.getInt(0);//there's only 1 column in cursor since you only get MAX, not dataset

And look at LogCat, it will tell you about your problem.