Android - SQLite - SELECT BETWEEN Date1 AND Date2

Question 1

Mac OS-X

Android

Eclipse with ADT

SQLite

I'm new to creating Android Apps and Ive researched this heavily but I'm getting nowhere. I need to query my SQLite database to return all the rows between 2 dates. What I have learnt from my research so far is that there is no DateTime column in Androids SQLite database and I have to save it as a text column. But I think the problem lies with trying to compare Strings but I can't figure out a way around it. Here is my code :

DB = currentContext.openOrCreateDatabase(DBName, 0, null);
DB.execSQL("CREATE TABLE IF NOT EXISTS " + tableName + " (ID INTEGER PRIMARY KEY AUTOINCREMENT, Date VARCHAR(40), Hours INT(3));");

I am not getting any errors but I am not returning any results from my RawQuery. Here is my code:

Cursor c = newDB.rawQuery("select ID, Date, Hours from " + tableName + " where Date BETWEEN '" + date1 + " 00:00:00' AND '" + date2 + " 99:99:99'", null);

if (c != null ) {
  Log.d(TAG, "date1: "+date1);
  Log.d(TAG, "date2: "+date2);
  if  (c.moveToFirst()) {
     do {
        int id = c.getInt(c.getColumnIndex("ID"));
        String date1 = c.getString(c.getColumnIndex("Date"));
        int hours1 = c.getInt(c.getColumnIndex("Hours"));
        results.add(+ id + "    Date: " + date1 + "    Hours: " + hours1);
     }
         while (c.moveToNext());
      }
}

I have also tried the following statement but they do not yield results either:

Cursor c = newDB.rawQuery("select ID, Date, Hours from " + tableName + " where Date BETWEEN " + Date(date1) + " AND " + Date(date2) + "", null);

I got this statement from other StackOverflow answers but I cannot find any documentation on the date() method. Im not sure whether it is obsolete now but I get error saying "Date(String) method is undefined for the type (classname)" and I have tried importing some JAVA Libraries.

Does anyone know the correct way to create a rawData() query that will get the rows between selected dates??

Further info, these are my INSERT statements and the date format that goes into the database:

newDB.execSQL("INSERT INTO " + tableName + " (Date, Hours) Values ('" + ph_date + "'," + hours + ");");
String date1 = "12/1/13"
String date2 = "25/1/13"

Question 2

Ok, so I could not get string dates to work, so I had to convert String Dates to Calendar Dates to Unix Time before adding them to the SQLite database and convert them back (Unix Time to Calendar Dates to String) when displaying them. Unix Time allows calculations (order by, sort ascending, between etc) done on the date columns and it is the best method to use after long hours of trial and error. Here is the code I ended up using:

Cursor c = newDB.rawQuery("select ID, Date, Hours from " + tableName + " where Date BETWEEN '" + startDateQueryDate + "' AND '" + endDateQueryDate + "' ORDER BY Date ASC", null);

            if (c != null ) {
                if  (c.moveToFirst()) {
                    do {
                        int tempId = c.getInt(c.getColumnIndex("ID"));
                        long tempUnixTime = c.getLong(c.getColumnIndex("Date"));

                        //convert tempUnixTime to Date
                        java.util.Date startDateDate = new java.util.Date(tempUnixTime);

                        //create SimpleDateFormat formatter
                        SimpleDateFormat formatter1;
                        formatter1 = new SimpleDateFormat("dd/MM/yyyy", Locale.UK);

                        //convert Date to SimpleDateFormat and convert to String
                        String tempStringStartDate = formatter1.format(startDateDate);

                        int tempHours = c.getInt(c.getColumnIndex("Hours"));
                        results.add(+ tempId + "    Date: " + tempStringStartDate + "    Hours: " + tempHours);
                    }while (c.moveToNext());
                }
            }

Question 3

You can do something like this:

 mDb.query(MY_TABLE, null, DATE_COL + " BETWEEN ? AND ?", new String[] {
                minDate + " 00:00:00", maxDate + " 23:59:59" }, null, null, null, null);

minDate and maxDate, which are date strings, make up your range. This query will get all rows from MY_TABLE which fall between this range.

Question 4

SELECT * FROM events 
  WHERE date1<='2012-01-18'
  AND date2>='2012-01-18'

Question 5

SQLiteConnectionPooling was added in after Android 4.1. Whereas in previous versions a cursor object would simply try to reopen a database if a query or other operation was made on a connection that was closed, with Connection Pooling, an exception is thrown. The NotesDBAdapter is probably a throwback which may have broken compatibility with 4.2.2.

Question 6

The VACUUM command may be what you want.

This will copy the data to a temporary database and then use this to overwrite the original.

You would use something along the lines of:-

    db.execSQL("VACUUM");

Note the warnings about compatibility in the following:-

SQL As Understood By SQLite - VACUUM

Android - SQLite - SELECT BETWEEN Date1 AND Date2

Answers

java,android,sqlite,date,android-sqlite