Java.util.Date - date range limitations ?

Hi all,
I have a problem when retrieving a Date from a database (java.sql.Date date = resultset.getDate(columnumber)).
When the database field contains a date until 2039-12-31 everything works fine, but when the date is after 2040-01-01, the resultset returns NULL.
Even when I fetch the field as a String (resultset.getString()) or as an Object (resultset.getObject()) the problem remains.
I thought it could have something to do with the fact that a Date object internally holds its state as the number of msec since 1970 - a long - and large dates cannot be kept in this format.
However, in the javadocs, I didn't find any explanation or limitation on the ranges for a date.
What should I do to solve or bypass this problem ?
Thanks !!
Sophie

...msec since 1970 - a long - and large dates cannot be kept in this format.That doesn't have anything to do with it. It stores the time as a long which is 64 bits. So (if my calculations are correct) it should allow for a span of more than 500 million years. That would 250 million years after 1970.
The following gives a year of 33658.
System.out.println("" + new Date(1000000000000000L));
The specified date of "2039-12-31" is highly unusual. One could presume that a boundary condition is causing the problem. Normally dates are calculated from 1/1/1970 00:00:00 (sometimes 1980.) But using a 32 bit integer with seconds as the unit for that gives an expiration in 2038 and it does not fall at the end of the year. Could there be a trigger that is limiting the date field?
It is possible that the cause of your problem is the database or driver (which might consist solely of a jdbc driver or might consist of other parts.) But given the unusual value that you are seeing I wouldn't be surprised if something else is causing it.

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Hi
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=========
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================
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>
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Hi Meera
This works fine in creator. I tested with a webservice having a method which returns java.util.date. I used the same code in that method to return java.util.Date. But the same method was returning a Calendar object instead of Date. So I added getTime() method to get the Date.
Can you post few lines of your code that you are writing in Creator.
Thanks
Creator Support

Error:Class java.util.date not found

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^
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kind regards...
null

Thank you very much.It worked:)
Java is case-sensitive.
try
java.util.Date
instead of
java.util.date
null

What's wrong with java.util.Date type?

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"Alexey Maslov" <[email protected]> wrote in message
news:[email protected]...
Patric,
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>
"Patrick Linskey" <[email protected]> wrote in message
news:[email protected]...
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(http://www.solarmetric.com/Software/beta/2.4.0) will almost certainly
get rid of this problem, as we use exclusively prepared statements in
it, and therefore pass dates etc. to JDBC as parameters.
But, to get things working with your Oracle database and Kodo JDO 2.3,
you could create your own extension of OracleDictionary and override the
dateToSQL() method to generate the appropriate TO_DATE() syntax. See our
documentation for more details on creating custom database dictionaries.
-Patrick
Alexey Maslov wrote:
I've added TRACE level logging for transactions in JBoss and got
original
exception:
NestedThrowables:
com.solarmetric.kodo.impl.jdbc.sql.SQLExceptionWrapper: [SQL=INSERT
INTO
BILLY.T
T_MAIN(TT_SOLUTION_ID, DELAY_REASON, TT_STATE_ID, ID, CONTACT_PHONE,
CANCEL_REAS
ON, OPER_DESCR, TT_TYPE_ID, CREATED_BY, EXP_CLOSE_DATE,SERV_OPEN_DATE,
OPEN_DAT
E, FLAGS, TAKEN_BY, TT_CAT_ID, SUBJECT_ID, SUBJECT, SERV_CLOSE_DATE)
VALUES
(NUL
L, NULL, 1, 439, NULL, NULL, '____________ ________________ ________________', 7, 5, {ts
'2002-11-14 1
8:38:16.075'}, NULL, {ts '2002-11-14 18:18:16.075'}, 0, NULL, 11,24099,
'1', NU
LL)] ORA-00904: invalid column name
at
com.solarmetric.kodo.impl.jdbc.runtime.SQLExceptions.throwFatal(SQLEx
ceptions.java:17)
at
com.solarmetric.kodo.impl.jdbc.runtime.JDBCStoreManager.insert(JDBCSt
oreManager.java:421)
at
com.solarmetric.kodo.runtime.datacache.DataCacheStoreManager.insert(D
ataCacheStoreManager.java:265)
at
com.solarmetric.kodo.runtime.StateManagerImpl.insert(StateManagerImpl
..java:1783)
atcom.solarmetric.kodo.runtime.PNewState.flush(PNewState.java:31)
at
com.solarmetric.kodo.runtime.StateManagerImpl.flush(StateManagerImpl.
java:372)
at
com.solarmetric.kodo.runtime.PersistenceManagerImpl.flush(Persistence
ManagerImpl.java:426)
at
com.solarmetric.kodo.ee.EEPersistenceManager.beforeCompletion(EEPersi
But when I try to execute the statement above against the database
manually
everything works fine.
I'm absolutely desperate!
P.S. On 2.4.0 RC the operation invoking this database insert completes
fine.
"Alexey Maslov" wrote in message
news:[email protected]...
Hi!
When I try to persist object having field of type java.util.Date I
get
the
following SQL logged by Kodo with subsequent transaction rollback:
2002-11-14 15:03:35,099 INFO
[com.solarmetric.kodo.impl.jdbc.ee.ManagedConnecti
onFactoryImpl.supportcrm/kodo] INSERT INTOBILLY.TT_COMMENTS(COMMENT_TYPE,
TEXT,
CREATED_BY, ID, SUBJECT, CREATE_DATE, TT_MAIN_ID) VALUES (1, '1',
10,
>>>
279,
'1',
{ts '2002-11-14 15:03:35.059'}, 147)
When I change "{ts '2002-11-14 15:03:35.059'}" with
"TO_DATE('2002-11-14
15:03', 'YYYY-DD-MM HH24:MI')" in SQL editor
and execute it everything works fine.
What does "{ts '..'}" mean? Is it a SQL generation error?
Thank you in advance.
Best regards,
Alexey Maslov
Patrick Linskey [email protected]
SolarMetric Inc. http://www.solarmetric.com
Best regards,
Alexey Maslov

What's wrong with java.util.Date??

Hi all,
I was just practicing a bit of java.util ,when i was compiling my code-
import java.util.Date;
import java.text.SimpleDateFormat;
class DateStamp{
public static void Main(String args[]){
doDate1;
String D;
int D1,D2,D3;
Date dt=new Date();
SimpleDateFormat sdf=new SimpleDateFormat("dd-mm-yyyy");
/*When using method .setDate(x) ,is x an integer or String?can x=2/5/2002 or 2-5-2002?*/
public void doDate1{
dt.setDay(12);
dt.setMonth(12);
dt.setYear(102);
D=dt.getTime();
D.parseInt(D1);D=""
D=sdf.getTime();
D.parseInt(D2);
int D3=D2-D1;
int D3=D3/86400000;/*How do you convert milisec-to-days?*/
D=D3.toString().
System.out.println(D+"days have elapsed since then");
the compiler said this-
File Compiled...
--------------------------- Javac Output ---------------------------
DateStamp.java:7: Invalid expression statement.doDate1;^DateStamp.java:14: Instance variables can't be void: doDate1public void doDate1; ^2 errors
this problem is persistant, and i'm a java newbie ,Does anyone know what's wrong here?
Thanks!
Regards,
aesh83

How do you get System date onto a Date variable?Calendar.getInstance().getTime() returns a java.util.Date for the current time. You can also use System.currentTimeMillis() and turn it into a Date.
Will date.after(Date when) method work when Date
variables are in milisecs?Date.after(Date when) compares two date objects. As the JavaDoc says "Returns:
true if and only if the instant represented by this Date object is strictly later than the instant represented by when" To me that says that milliseconds are taken into account, I.E. comparing dates actually compares the date plus the time portion.
>
What methods-
*Convert a date(dd/mm/yy) to milisec?If you look in the javaDoc you'll see "long getTime() Returns the number of milliseconds since January 1, 1970, 00:00:00 GMT represented by this Date object." Calendar also has the getTimeInMillis() method.
*Convert a milisec value to a date(dd/mm/yy)?Calendar.setTimeInMillis(long);
I'm have this little problem.
When using GregorianCalander-
*need to initialize?
*need set today's date?Calendar.getInstance() will return an appropriate Calendar object for the current locale initialized to the current date/time.
*how do you check if a date exceeds 3 weeks?I'm not sure what you mean. There are a couple of roll(...) methods that will allow you to add a unit of time to a date. I.E. you could add three weeks to a date.
To ignore the time portion of a date just set the time to "00:00"
Col

How can i compare: java.util.Date oracle.jbo.domain.Date?

I have made a ViewObject wich contains a date column.
I want to check if this date is smaller/greater than sysdate:
i get following error:
Error(45,24): method <(java.util.Date, oracle.jbo.domain.Date) not found in class Class4
code:
SimpleTimeZone pdt = new SimpleTimeZone(-8 * 60 * 60 * 1000, ids[0]);
// set up rules for daylight savings time
pdt.setStartRule(Calendar.APRIL, 1, Calendar.SUNDAY, 2 * 60 * 60 * 1000);
pdt.setEndRule(Calendar.OCTOBER, -1, Calendar.SUNDAY, 2 * 60 * 60 * 1000);
// create a GregorianCalendar with the Pacific Daylight time zone
// and the current date and time
Calendar calendar = new GregorianCalendar(pdt);
Date trialTime = new Date();
calendar.setTime(trialTime);
(VO_ULNRow)singleRow = null;
while(vo.hasNext()){ // ViewObject vo;
singleRow = (VO_ULNRow)vo.next();
if(calendar.getTime() < singleRow.getEO_ULN_BORROWFROM()); //singleRow returns oracle.jbo.domain.Date
etcetera
how can i compare those 2?

Hi,
oracle.jbo.domain.Date has two methods which suit your needs
longValue() which returns a long (though I'm not sure if returns a long comparable to the long returned by java.util.Date)
and dateValue() which returns a java.util.Date
I hope it helps,
Giovanni

Java.util.Date - date range limitations ?

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