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IDS Forum

Re: dbaccessdemo and the blob columns in catalog t

Posted By: Andreas Legner1
Date: Wednesday, 13 December 2017, at 11:26 a.m.

In Response To: Re: dbaccessdemo and the blob columns in catalog t (JACOB SALOMON)

Hi Jacob,

just quickly, and I might be missing something, maybe even your point:

Afaik, filetoblob() is for BLOB/CLOB sblobs, won't work for TEXT/BYTE

The syntax you're referring to: 0,62,/tmp/catalog.des
This is very dbaccess LOAD specific, it means: take 62 bytes from offset
0 into file /tmp/catalog.des and put them into this row/field in the

Have a look at $INFORMIXDIR/demo/esqlc/ for how blob
inserting/updating is done internally. Not many more ways, besides SQL
For some testing, the blobload utility can be quite handy.


Date: 12/13/2017 02:06 AM
Subject: Re: dbaccessdemo and the blob columns in catalog t [40365]
Sent by:

The bottom line of this post is a request for help on the FILETOBLOB
and how I would avoid the errors in the explicit update of a blob column
for a

But first, I need to thank Luis for pointing me to the the alternative


Thanks. I had never heard of the dbaccessdemo_ud before. I already have
of DBspaces do draw from:

DBspace DNum Type k/pg Chunks NumPages FreePgs %-Full
rootdbs 1 ---M 2 1 500000 487303 2.54
plog_dbs 2 ---N 2 1 400000 24947 93.76
llog_dbs 3 ---N 2 1 250100 47 99.98
tmpdbs01 4 T--N 8 1 25000 24947 0.21
tmpdbs02 5 T--N 8 1 25000 24947 0.21
data_dbs 6 ---M 16 4 43750 41089 6.08
index_dbs 7 ---M 8 1 50000 49923 0.15
blobs_dbs 8 -B-N 6 1 50000 49859 0.28
sbdbs01 9 --SN 2 1 12500 644 94.85
syssbdbs01 10 --SN 2 1 12500 644 94.85

Unfortunately, the above will get is spaces squeezed out of it so that you
can't see how neat the columns are. But I will have no problem specifying a

DBspace for the data. Now if I could only manipulate the script to create
indexes in index_dbs. But I digress..

My attempts to update the byte-blob column of the first row in catalog has
opened my eyes to an area whence I have never ventured: The explicit
of a blob column in a SQL statement in dbaccess. As all could see, my use
the filetoblob() SQL function was failing. Can anyone point me to the
syntax to accomplish that?

I thought that I might gain some insight from the .unl file for catalog.
Here's the first line:

0|1|HRO|case|ROW(/tmp/cn_1001.gif,"Your First Season's Baseball

(Please widen your window if that wrapped)

Interesting syntax in that last column: |0,62,/tmp/catalog.des|
Where is this documented? I think I have all of the 12.10 manuals in PDF so

it's a matter where where to look in that haystack. But the .des file is
text so I don't follow how that relates to a blob. And the meaning of that
0,62? My ignorance is on display here. HELP!

Can someone point me to working example of this? As I mentioned, I find
insert statements with FILETOBLOB calls, no updates. I have yet to start
playing with the inserts to see if I can *those* working.

Thanks much for advice here.

-- Jacob S.


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