Advice on how to return the system time to a string type used to pass to SQL, datetime type

Get the current system time gettime a string "yyyy-MM-dd HH: mm: ss.SSS" into SQL datetime type in the how to write it
SimpleDateFormat bartDateFormat = new SimpleDateFormat ("yyyy-MM-dd HH: mm: ss.SSS");

bartDateFormat = getTime () tostring ().;

not to die , how to write ?
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SimpleDateFormat bartDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS");
  		String time=	bartDateFormat.format(Calendar.getInstance().getTime());
  		System.out.println(time);
  		 
  		SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
  		System.out.println(sdf.format(new Date()));

sql has cast function

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write separately , finished in a combined into sql time format to try