Heath Thomann created OPENJPA-2453:
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Summary: Add support to retain milliseconds of 'un-rounded' Date
field.
Key: OPENJPA-2453
URL: https://issues.apache.org/jira/browse/OPENJPA-2453
Project: OpenJPA
Issue Type: Improvement
Affects Versions: 2.2.1, 2.3.0
Reporter: Heath Thomann
Assignee: Heath Thomann
Priority: Minor
Take the following Entity:
public class TemporalEntity {
@Id
private Integer id;
@Temporal(TemporalType.TIMESTAMP)
private java.util.Date testDate;
.....
Take this row in the DB (Timestamp is used in the DB):
ID TESTDATE
1 2010-01-01 12:00:00.687701
Using a Date, I can not directly get the fractional seconds (i.e. .687701).
However, I can use a formatter as follows and the milliseconds will be printed:
TemporalEntity t = em.find(TemporalEntity.class, 1);
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS");
System.out.println("sdf.format(t.getTestDate()) = " +
sdf.format(t.getTestDate()).toString());
E.g:
sdf.format(t.getTestDate()) = 2010-01-01 12:00:00.688
Notice that the milliseconds are rounded. OpenJPA rounds the milliseconds by
default. This rounding was not desirable by some users. For example, take the
insert of this data:
INSERT INTO TemporalEntity (Id, testDate) VALUES(1, '9999-12-31 23:59:59.9999')
The Date inserted into the DB is .1 milliseconds from the next day of the next
year. When a query is performed on this row, OpenJPA rounds the Date to the
nearest millisecond which means the Date seen by the user represents the next
day and year. A while back we added a system property ('roundTimeToMillisec',
via OPENJPA-2159) to OpenJPA to allow the milliseconds to be stripped off and
thus avoid the rounding. So we avoid rounding, but in doing so the
milliseconds are completely removed when the property is set. For example,
when roundTimeToMillisec=false, the above date of '9999-12-31 23:59:59.9999'
will not be rounded up. HOWEVER, the .999 will be stripped off. So, take our
String format example above, the output would be:
sdf.format(t.getTestDate()) = 2010-01-01 12:00:00.000
A user may find it desirable to avoid the rounding, but may not like the fact
that .688 is removed.
This JIRA will be used to allow a user to avoid rounding of milliseconds, but
will allow the milliseconds to be retained.
Thanks,
Heath Thomann
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