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Re: Date calculation, NSTimestamp, and PostgreSQL



Try the following instead (you may have to diddle with it - written from memory):

Calendar workingCalendar = Calendar.getInstance();
workingCalendar.add( Calendar.DAY_OF_MONTH, -365 );

// convert to NSTimestamp
NSTimestamp dateOneYearAgo = new NSTimestamp(workingCalendar.getTime());

NSArray args = new NSArray(new Object[] {key, dateOneYearAgo});
qual = EOQualifier.qualifierWithQualifierFormat("custNo = %@ and dateTime > %@", args);


etc..


EOQualkifier tries to parse what you send it. You are sending it a long string - it can't convert that to Postgres-speak. But it can substitute objects into a qualifier string for you and parse them correctly.



Good luck! Geoff


On 29 Jun 2004, at 19:21, Randall Perry wrote:

I'm creating an EOQualifier to perform a fetch against a PostgreSQL db. I
calculate the time one year ago today and place it in an NSTimestamp
dateOneYearAgo. NSTimestamp is the java value class in the EOModel for the
dateTime field.


When I try to perform the fetch PostgreSQL chokes because the value of the
dateOneYearAgo NSTimestamp is "2003-06-30 18:08:39 Etc/GMT", and PostgreSQL
expects timestamps like this: "2003-06-30 18:08:39 GMT", or this:
"2004-06-29 14:11:20.288774".


So I need a way to format dateOneYearAgo that PostgreSQL will accept.

Any ideas on the best way to accomplish this? (see code below).


// create Calendar obj and calc date one year ago Calendar workingCalendar = Calendar.getInstance(); workingCalendar.add( Calendar.DAY_OF_MONTH, -365 );

// convert to NSTimestamp
NSTimestamp dateOneYearAgo = new NSTimestamp(workingCalendar.getTime());


// create qualifier and perform fetch
qual = EOQualifier.qualifierWithQualifierFormat("custNo = " + key + "and
dateTime > '" + dateOneYearAgo + "'", null);
logInfo = ec.objectsWithFetchSpecification(logFetchSpec);



-- Randall Perry sysTame

Xserve Web Hosting/Co-location
Website Design/Development
WebObjects Hosting
Mac Consulting/Sales

http://www.systame.com/
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References: 
 >Date calculation, NSTimestamp, and PostgreSQL (From: Randall Perry <email@hidden>)



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