无法弄清楚为什么SQL语句不能正常运行

Question

I can't understand what's wrong with my statement. Seems right to me, and the cursor should include both rows in my database table. According to SQLite website this formatted date is supported (Also tried with other supported dates).

        String statement = "SELECT * FROM " + TABLE_DISTANCE_NAME + " WHERE " + COLUMN_TIME_DISTANCE_ADDED + " BETWEEN " + "2014-07-14" + " AND " + "2014-08-14";
        Log.d("statement", statement);
        Cursor cur = db.rawQuery(statement, null);
        Log.d("cursor amount rows", Integer.toString(cur.getCount()));

        if (cur != null) {
            cur.moveToFirst();
        }    
        int totalDistance = 0;
        while (cur.isAfterLast() == false) {
            Log.d("cursor distance value", Integer.toString(cur.getInt(0)));
            totalDistance += cur.getInt(0);
            cur.moveToNext();
        }
        Log.d("Total Distance traveled = ", Integer.toString(totalDistance));

This is what the table looks like.

Log:

...statement﹕ SELECT * FROM distanceTraveled WHERE timedistadded BETWEEN 2014-07-14 AND 2014-08-14

com.example.RoadTrip D/cursor amount rows﹕ 0
com.example.RoadTrip D/Total Distance traveled =﹕ 0

Thank you

Answer 1

Date constants need to be enclosed in single quotes:

" WHERE " + COLUMN_TIME_DISTANCE_ADDED + " BETWEEN " + "'2014-07-14'" + " AND " + "'2014-08-14'";

This problem would be more readily apparent if you printed out the SQL statement after the substitution. That is always a good first step in trying to debug this type of problem.

Answer 2

try quoting you query paramaters

eg

+ "'2014-07-14'" + " AND " + "'2014-08-14'"

Dates and Strings need to be single quoted as per SQL.