SQLite select all records for today and previous day

Question

I have the following table in my database:

    database.execSQL("create table " + TABLE_LOGS + " (" 
            + COLUMN_ID + " integer primary key autoincrement," 
            + COLUMN_ID_DAY_EXERCISE + " integer not null,"
            + COLUMN_REPS + " integer not null,"
            + COLUMN_WEIGHT + " real not null,"
            + COLUMN_1RM + " real not null,"
            + COLUMN_DATE + " integer not null"
            + ")");

I store a unix timestamp in the COLUMN_DATE field (integer).

Now I have the following function which grabs all of the records:

public Cursor fetchCurrentLogs(long dayExerciseDataID) {
    // where day = today
    Cursor cursor = database.rawQuery("select " + MySQLiteHelper.COLUMN_ID + "," + MySQLiteHelper.COLUMN_REPS + ", " + MySQLiteHelper.COLUMN_WEIGHT + " " +
            "from " + MySQLiteHelper.TABLE_LOGS + " " +
            "where " + MySQLiteHelper.COLUMN_ID_DAY_EXERCISE + " = '" + dayExerciseDataID + "'", null);
    if (cursor != null) { cursor.moveToFirst(); }
    return cursor;
}

Now what I want to do, is I want to make this function only grab the records for today.

Then I want to make another function exactly the same, however instead of getting the records for today, I want it to get the records for the previous day. By previous, I mean the most recent day that has records that is not today. So it could be yesterday, or 3 days ago, or a month ago.

I know in MySQL you can do something like this for the current day:

where date_format(from_unixtime(COLUMN_DATE), '%Y-%m-%d')= date_format(now(), '%Y-%m-%d')

What is the equivalent to this for SQLite?

Also, can anyone help me with the where clause for the previous day as mentioned above?

Thanks so much.

Answer 1

String sql = "SELECT * FROM myTable WHERE myDate >= date('now','-1 day')"; 
Cursor mycursor = db.rawQuery(sql);

EDIT:

SELECT * from Table1 where myDate = (select max(myDate) from Table1 WHERE myDate < DATE('now') )

Answer 2

See the date/time functions documentation :

SELECT *
FROM MyTable
WHERE myDate >= date('now', '-1 days')
  AND myDate <  date('now')

Answer 3

May be It is too late but, it can help someone. I am not doing differently as previous developers, I just wanted to put my version and probably it is not even the best...

    String selectQuery = "SELECT * FROM "+Your_table+" 
WHERE ("+Column_1+" = "+Value_For_Column1+" AND date("+Your_Column_With_Time_Values+") == date('now')) AND 

"+Some_Other_Column+" = "+Some_Other_Value+" OR "+Some_Other_Column+" = "+Some_Other_Value+" ORDER BY "+Your_Column+" DESC";

If there could be some mistake it could be easily due to string concatenation. Thank you!!

Answer 4

Don't do the conversion in your SQL statement. Do the conversion in your Java method. Have your Java method create the full SQL statement. All you need is a function to convert the Java DateTime into the unix format.

Cursor cursor = database.rawQuery("select " + MySQLiteHelper.COLUMN_ID + "," + MySQLiteHelper.COLUMN_REPS + ", " + MySQLiteHelper.COLUMN_WEIGHT + " " +
            "from " + MySQLiteHelper.TABLE_LOGS + " " +
            "where " + MySQLiteHelper.COLUMN_ID_DAY_EXERCISE + " = '" + dayExerciseDataID + 
            " OR " + MySQLiteHelper.COLUMN_ID_DAY_EXERCISE + " = '" + previousDay(dayExerciseDataID) +
"'", null);

You just need to create that previousDay method.