Conversion between Date and time at sql type package at the package util

Time Type 
Database type correspondence relationship types and middle java: 
DATE-java.sql.Date 
the TIME-a java.sql.Time 
TIMESTAMP-a java.sql.Timestamp 

· art objects (Domain) attributes can not appear in the package java.sql ! things 
· ResultSet # getDate () returns java.sql.Date (); 
· PrepareStatement # setDate (int, a Date) where the second parameter is java.sql.Date 

time type conversion 
· java.util.Date- java.sql.Date, Time, Timestamp. 
  > Date to convert util millisecond value of 
  > sql create a Date object using a milliseconds value 
· java.sql.Date, Time, Timestamp-java.util.Date 
  > this step without treatment because subclasses of java.util.Date is java.sql.Date