You're thinking C++.
In Java:
A long is 8 bytes, always.
An int is 4 bytes, always.
The byte-orders are fixed independent of the hardware, too.
Speaking of byte size, here's something I found amusing (and annoying):
long millisInMonth = 1000 * 60 * 60 * 24 * 30;
Date thirtyDaysAgo = new Date();
thirtyDaysAgo.setTime(thirtyDaysAgo.getTime() - millisInMonth);
This actually produces a date in the FUTURE!
It took me a while to hunt down this bug because it had really wierd
effects on my application.
Jeff
>-----Original Message-----
>From: Michael A Third [mailto:[EMAIL PROTECTED]]
>Sent: Wednesday, February 28, 2001 11:02 AM
>To: Orion-Interest
>Subject: RE: Database schema type mappings
>
>
>Randahl,
>
>We use the primitive long for all of our primary keys for a couple of
>reasons:
>* primary keys can't be null so there isn't a need for Long
>(or Integer)
>* long's are always 4 bytes no matter what the CPU (32bit vs
>64bit), which
>is currently not a problem but could be when Itanium platforms
>come out.
>int's depend on the CPU's native integer type which happens to
>be 32bits on
>ix86 architectures.
>
>Michael Third
>Chief Software Architect
>parts.com
>
>
>-----Original Message-----
>From: [EMAIL PROTECTED]
>[mailto:[EMAIL PROTECTED]]On Behalf Of Randahl Fink
>Isaksen
>Sent: Wednesday, February 28, 2001 10:02 AM
>To: Orion-Interest
>Subject: Database schema type mappings
>
>
>If you look at the database schema in
>"orion/config/database-schemas/hypersonic.xml" it looks as if
>it is mapping
>between the primitive java type "int" and the corresponding
>database type
>"int":
><type-mapping type="int" name="int" />.
>
>In my EJBs my primary keys and other attributes are of type
>Integer. Since
>there is no mapping for class Integer one could think that
>Integers would be
>mapped to VARBINARY. Luckily my integers are mapped to the
>database type
>"int", but this makes me ask two questions:
>
>1. Why is Integers automatically converted to int by Orion -
>and is this a
>standard EJB convention?
>2. Would it be legal to have a primary key of the primitive type "int"
>instead of Integer?
>
>
>Yours
>
>Randahl
>
>
>
