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Re: InstantDB: ORDER BY CollationKey?


Pete,

Thanks for the reply, and on Sunday, no less!

Two questions: one about your suggestion and one about my original
post.

1) In your example, what java methods does the order clause
   use to compare java.lang.Object's that are returned by the
   function "lower"?  That is, what methods are used to compare 
   arbitrary objects that are returned by the evaluate method of 
   the sqlFunction interface?

2) I suppose that my orginal question boils down to: can
   order clauses be used on BINARY columns?
   
Although the idea of writing my own sql function is attractive,
I may shy away from it because I assume that it will reduce the
degree to which my application is portable.  (I have no idea
how general the notion of user-defined sql functions really is.)

Thanks,

Dick

Most recent message:
> From: Peter Hearty <peter.hearty@lutris.com>
> To: instantDB@enhydra.org
> Date: Sun, 10 Dec 2000 15:39:07 GMT
> Subject: Re: InstantDB: ORDER BY CollationKey?
>
>Dick
>
>Don't know if this is exactly what you asked for, but this extract from 
>a ScriptTool script illustrates how to alter the collation sequence 
>using a string function
>
>drop table test;
>create table test (id int, name char(40) );
>insert into test values (1, "Zog");
>insert into test values (2, "alan");
>q select * from test order by name;
>q select lower(name),test.* from test order by 1;
>
>As you can write your own functions, you can effectively have any 
>collation sequence that you like.
>
>Regards
>
>Pete
>
>----- Original Message -----
>From: Dick Repasky <drepasky@bio.indiana.edu>
>Date: Sunday, December 10, 2000 2:13 am
>Subject: InstantDB: ORDER BY CollationKey?
>
>> 
>> Hello, all,
>> 
>> This is my first post.
>> 
>> I'd like to use the ORDER clause on strings and have them be ordered
>> as they would be by a java Collator.  (What counts is that lower and
>> upper cases be honored but grouped together by first letter rather 
>> thanappearing as all upper case instances of all letters followed 
>> by all
>> lower case instances of all letters.  I'm also interested in 
>> supportingmultiple languages.)  I understand that this is not 
>> possible in instantdb
>> by default.
>> 
>> The question is: can I obtain the desired effect by using a table 
>> columnthat contains CollationKeys and use the ORDER clause on the 
>> key column?
>> The idea is to use the toByteArray() method of CollationKey to get a
>> plain form of the keys and then put the bytes into a column of type
>> BINARY in the table and use ORDER on that column.  Presto?
>> 
>> Thanks,
>> 
>> Dick
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>
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