问题
In looking through the Joda-Time Hibernate user guide it appears that there is no future support for the SQL DATE type. Since TIMESTAMP is specified to start on Jan 1, 1970 - the only safe transport for dates before 1970 appears to be VARCHAR with PersistentLocalTimeAsString (if one wishes to restrict themselves to the Joda Hibernate library).
As someone who uses DATE (and seeing that Joda Hibernate isn't) I am wondering if there is some reason I should switch to VARCHAR and PersistentLocalTimeAsString. Ie. what motivated the decision to deprecate PersistentYearMonthDay?
回答1:
It doesn't start on 1970, it's a zero point, but it could be negative. The reason why the PersistentYearMonthDay deprecated is deprecation of YearMonthDay. Motivated as "Use LocalDate which has a much better internal implementation and has been available since 1.3"
Also, it's weird, but the source code for the PersistentLocalDate has DATE sql type, while the user guide says TIMESTAMP, try it, maybe just a typo in the user guide.
回答2:
long someTimeBefore1970 = -83688769L;
Timestamp ts = new Timestamp(someTimeBefore1970);
System.out.println(ts);
The 0 is set to the 1st Jan. 1970, but that doesn't mean that dates before aren't supported.
来源：https://stackoverflow.com/questions/8307593/joda-time-hibernate-persistentyearmonthday-deprecated