Search found 124 matches

by HughDarwen
Wed Aug 20, 2008 2:13 pm
Forum: Report a Bug
Topic: Strange error messages
Replies: 2
Views: 6110

Strange error messages

I've been getting some strange-looking error messages from V3.12. E.g. (in DBrowser): (2+1)) ERROR: Encountered " ")" ") "" at line 1, column 6. In general, the word "Encountered" seems to followed by a repetition of the rogue token. Here's another example: tu...
by HughDarwen
Wed Aug 13, 2008 3:25 pm
Forum: Rel Examples
Topic: How about a LENGTH operator?
Replies: 1
Views: 10576

How about a LENGTH operator?

I found the package of FOREIGN string operators not only very useful but also informative--even though I don't know Java I might just be able to learn enough from them to write a simple FOREIGN operator myself! I was surprised not to find OPERATOR LENGTH ( C CHAR ) RETURNS INTEGER in that package, b...
by HughDarwen
Wed Aug 13, 2008 3:17 pm
Forum: Rel's "DBrowser": The Rel Graphical User Interface
Topic: Display of character stirng results
Replies: 1
Views: 7635

Display of character stirng results

This is just an idle observation and should not be treated with any degree of urgency at all. If there's a prioritised list of planned enhancements, please put it at the bottom if you plan to accept it at all. There's a curious difference in treatment of tuple{x 'abc'} and just 'abc'. The result dis...
by HughDarwen
Tue Jul 29, 2008 1:07 pm
Forum: Rel's "DBrowser": The Rel Graphical User Interface
Topic: -f option doesn't work with paths including blanks
Replies: 2
Views: 9314

-f option doesn't work with paths including blanks

In version 0.3.8 I had been using the following Windows commands to invoke Dbrowser: s: cd \Rel\V3.8 java -jar DBrowser.jar -f"d:\Rel version 3\BirdTrack.0.3.8" However, when I installed version 0.3.9 in s:\Rel\V3.9 and set up a new directory, d:\Rel version 3\BirdTrack.0.3.9, for my datab...
by HughDarwen
Tue Jul 29, 2008 12:55 pm
Forum: Rel's "DBrowser": The Rel Graphical User Interface
Topic: Backup in 0.3.9 on Windows Vista uses invalid filename
Replies: 3
Views: 10883

Backup in 0.3.9 on Windows Vista uses invalid filename

With the location box showing local:d:\Rel-version-3\BirdTrack.0.3.9, I clicked on Backup. Backup invited me to save the backup using the following filename: relbackup_d:_Rel-version-3_BirdTrack_0_3_9_2008_July_29_01_44_PM.d I decided to take that and I eventually got the message saying the backup h...
by HughDarwen
Thu Jul 24, 2008 4:59 pm
Forum: Report a Bug
Topic: V2 features apparently no longer supported
Replies: 4
Views: 8188

Re: V2 features apparently no longer supported

The return of FOR (the <iterate statement>) and ORDER is imminent, possibly as soon as version 0.3.10. Along with these, I'm inclined to provide a command-line switch to optionally disable such extensions, for use in pedagogical (or other) contexts where strict adherence to Tutorial D is desirable....
by HughDarwen
Mon Jul 21, 2008 3:50 pm
Forum: Report a Bug
Topic: V2 features apparently no longer supported
Replies: 4
Views: 8188

V2 features apparently no longer supported

I'm not sure you would regard this as a bug, but I couldn't find a more appropriate section to raise this issue in. Two V2 features I was using seem to be no longer available. The first is <iterate statement>, though the use I was putting this to is now subsumed by the new "enhanced" featu...
by HughDarwen
Mon Jul 21, 2008 3:35 pm
Forum: Report a Bug
Topic: switch back to enhanced causes exception
Replies: 3
Views: 6844

Re: switch back to enhanced causes exception

Thank you, Dave. I was expecting a reply of this sort. The problem doesn't bother me greatly and I can live with it.

Hugh
by HughDarwen
Mon Jul 21, 2008 3:28 pm
Forum: Rel's "DBrowser": The Rel Graphical User Interface
Topic: Changing the default database in Rel and DBrowser
Replies: 2
Views: 9908

Re: Changing the default database in Rel and DBrowser

Thank you, Dave. This will be very useful to me, now that I know about it!

I made a lot of trouble for myself by having spaces in my directory name. I eventually remembered to use double quotes around the entire path. You might want to mention that requirement when you document this feature.

Hugh
by HughDarwen
Tue Jul 15, 2008 2:09 pm
Forum: Report a Bug
Topic: switch back to enhanced causes exception
Replies: 3
Views: 6844

switch back to enhanced causes exception

Sorry about this--it appears to be an "out of memory" exception, perhaps caused by an unreasonably large query result. I'm sure I can live with "no action", if necessary, but I'd like to know your position and policy regarding such problems. With "Enhanced" turned on, I...
by HughDarwen
Tue Jul 15, 2008 1:42 pm
Forum: Report a Bug
Topic: phoney deadlocks after restore from backup
Replies: 1
Views: 4813

phoney deadlocks after restore from backup

Using Rel Version 0.3.8, I successfully (?) restored my database from the backup taken using Rel Version 0.3.5 Alpha, using the supplied script, DatabaseToScript.d. However, when I subsequently tried the simplest possible query against one of my relvars, I got a deadlock exception (see below). The p...
by HughDarwen
Fri Jun 27, 2008 5:15 pm
Forum: Getting Started
Topic: Installed JDK 6 but OperatorsChar.d doesn't work
Replies: 8
Views: 20715

Re: Installed JDK 6 but OperatorsChar.d doesn't work

Yes, I found I had several copies of Java on my computer. In fact, in c:\Program files\Java I found 7 or 8 directories for various different versions of JRE and JDK. It seems, then, that every time I've accepted the invitation to upgrade Java the previous version has been left intact. Also, my insta...
by HughDarwen
Tue Jun 24, 2008 3:15 pm
Forum: Getting Started
Topic: Installed JDK 6 but OperatorsChar.d doesn't work
Replies: 8
Views: 20715

Re: Installed JDK 6 but OperatorsChar.d doesn't work

Okay, now OperatorsChar.d works, but invocation of the defined operators doesn't. They all give the same exception, "String index out of range: 1." Here's an example: EQUALS_IGNORE_CASE('Darwen','DARWEN') ERROR: java.lang.StringIndexOutOfBoundsException: String index out of range: 1 java.l...
by HughDarwen
Tue Jun 24, 2008 3:02 pm
Forum: Getting Started
Topic: Installed JDK 6 but OperatorsChar.d doesn't work
Replies: 8
Views: 20715

Re: Installed JDK 6 but OperatorsChar.d doesn't work

Yes, my system path had some nonexistent directories in it. I fixed that and now javac -version works. But now other things have gone wrong, so I'll get back to you when I've investigated further.

Hugh
by HughDarwen
Tue Jun 24, 2008 2:52 pm
Forum: Getting Started
Topic: Installed JDK 6 but OperatorsChar.d doesn't work
Replies: 8
Views: 20715

Re: Installed JDK 6 but OperatorsChar.d doesn't work

Hmm. It seems to be something wrong with my system path. When I start up cmd.exe I get this The system cannot find message text for message number 0x2350 in the message fil e for Application. The system cannot find message text for message number 0x2334 in the message fil e for Application. Then, th...