String converted to Data date type

For example: (a) Java language code

Converts a time input string tm= "1999-12-22" (time) to date (Java.sql.Date not java.util.Date)
And then in the DateTime-type Time field saved to SQL!
///////////////////////////////////////////////////////////////////////////////////////////////////////////////

SimpleDateFormat SDF = new SimpleDateFormat ("Yyyy-mm-dd");
String aa= "1999-12-22";
Java.util.Date timedate = null;
try {
Timedate = Sdf.parse (AA);
catch (ParseException e) {
TODO automatically generate catch blocks
E.printstacktrace ();
}//util type
Java.sql.Date dateTime = new Java.sql.Date (Timedate.gettime ());//sql type

For example: (i) Oracle

can be converted using Oracle's to_date function,
or java.sql.Date (int   year,   int   month,   int   day)   , it is automatically corresponding to the date type of Oracle; For example:
String   LSTR   =   "02-06-2003";
int   Lday   =   Integer.parseint (lstr.substring (0,2));
int   Lmon   =   Integer.parseint (lstr.substring (3,5));
int   Lyear   =   Integer.parseint (lstr.substring (6));

Date   ldate   =   new   Date (lyear,   Lmon,   lday);