How to retrive date and time from database and create notification on that particular date

How to retrive date and time from database and create notification on that
particular date

I want to create Reminder.I am using below code to generate notification
at a particular time and date set by the user.
public class MainActivity extends Activity {
TimePicker timePicker;
DatePicker datePicker;
Button button1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button1 = (Button) findViewById(R.id.button1);
button1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
timePicker = (TimePicker) findViewById(R.id.timePicker1);
datePicker = (DatePicker) findViewById(R.id.datePicker1);
AlarmManager alarmManager = (AlarmManager)
getSystemService(ALARM_SERVICE);
Calendar calendar = Calendar.getInstance();
calendar.set(Calendar.YEAR, datePicker.getYear());
calendar.set(Calendar.MONTH, datePicker.getMonth());
calendar.set(Calendar.DAY_OF_MONTH,
datePicker.getDayOfMonth());
calendar.set(Calendar.HOUR_OF_DAY,
timePicker.getCurrentHour());
calendar.set(Calendar.MINUTE, timePicker.getCurrentMinute());
calendar.set(Calendar.SECOND, 0);
Intent inn = new
Intent(MainActivity.this,AlaramDetail.class);
PendingIntent displayIntent = PendingIntent.getActivity(
getBaseContext(), 0,inn, 0);
alarmManager.set(AlarmManager.RTC_WAKEUP,
calendar.getTimeInMillis(), displayIntent);
}
});
}
}
Below is AlaramDetail class that have code for genrating notification.
public class AlaramDetail extends Activity {
@SuppressWarnings("deprecation")
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.detail);
NotificationManager nm =
(NotificationManager)getSystemService(Context.NOTIFICATION_SERVICE);
Notification notification = new
Notification(android.R.drawable.stat_notify_more, "This is important
notification",System.currentTimeMillis());
String title = "pay attention";
String detail = "this is implortant";
Intent intent = new Intent(AlaramDetail.this,AlaramDetail.class);
finish();
PendingIntent pintent = PendingIntent.getActivity(AlaramDetail.this,
0,intent ,0 );
notification.setLatestEventInfo(AlaramDetail.this, title, detail,
pintent);
notification.flags=Notification.FLAG_AUTO_CANCEL;
notification.defaults|=Notification.DEFAULT_SOUND;
notification.defaults|=Notification.DEFAULT_LIGHTS;
notification.defaults|=Notification.DEFAULT_VIBRATE;
nm.notify(1, notification);
}
}
above code is working correctly. After doing this I have created a
database that store multiple date and time inputted by the user.database
store date and time as string.now i want to generate notification at
particular date and time stored in database.I dont know how to pass date
and time from database to calendar.set(int field,int value) commands.I
think i can use cursor for retrieving date and time but i dont know what
value to pass in where and where args.My database has three columns
name,date,time.