[elephant-devel] Problem with Elephant and BTree access

[Robert L. Read]

Let me try to duplicate this.  I'll get back to you tonight.

On Thu, 2006-01-05 at 17:01 -0500, Waldo Rubinstein wrote:

> Hi,
> 
> I'm starting to use BTrees in elephant and am encountering a problem.  
> Basically, I added a BTree object to the root under a key named  
> "EDI-834-TAPES". I can retrieve the BTree object, but when I try to  
> access a BTree element (whether to read or write), I get an error.  
> See below:
> 
> CL-USER> (in-package ele)
> #<Package "ELEPHANT">
> ELE> (open-store "testdb")
> #<BDB-STORE-CONTROLLER #x8A5C816>
> ELE> (setf tapes (get-from-root "EDI-834-TAPES"))
> #<BTREE #x8A5805E>
> ELE> (get-value 1234 tapes)
> CL-USER> (in-package ele)
> #<Package "ELEPHANT">
> ELE> (open-store "testdb")
> #<BDB-STORE-CONTROLLER #x8A5C816>
> ELE> (setf tapes (get-from-root "EDI-834-TAPES"))
> #<BTREE #x8A5805E>
> ELE> (get-value 1234 tapes)
> 
> No applicable method for args:
> (1234 #<BTREE #x8A5805E>)
> to #<STANDARD-GENERIC-FUNCTION GET-VALUE #x84146AE>
>     [Condition of type SIMPLE-ERROR]
> 
> Restarts:
>    0: [ABORT-REQUEST] Abort handling SLIME request.
>    1: [ABORT-BREAK] Reset this process
>    2: [ABORT] Kill this process
> 
> Backtrace:
>    0: (#<CCL::STANDARD-KERNEL-METHOD NO-APPLICABLE-METHOD (T)>  
> #<STANDARD-GENERIC-FUNCTION GET-VALUE #x84146AE>)
>    1: (CCL::CALL-CHECK-REGS 'GET-VALUE)
> 
> Basically, the last statement (get-value) should return NIL since  
> there is not BTree element within the BTree object.
> 
> What am I doing wrong? I tried to "mimic" as close as possible the  
> steps in the Blog tutorial but keep getting to the same problem.
> 
> Thanks,
> Waldo
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