Someone needs to tell the third party application supplier that it's a bad idea
to store character data in a BLOB.
If they store it in a CLOB then it will translated into a two-byte fixed
characterset so that the person who inserts the data and the person who queries
the data could use different character sets and still see the correct data
(Oracle will translate both ways between the two-byte fixed and whatever client
character set is in use).
If they store the characters as a BLOB then Oracle doesn't do any translation-
after all, it's not "character" data, it's raw data - so the person reading the
data may find that they see garbage because they're trying to read the data
using a different encoding than that used by the original writer.
From: oracle-l-bounce@xxxxxxxxxxxxx <oracle-l-bounce@xxxxxxxxxxxxx> on behalf
of Sanjay Mishra <dmarc-noreply@xxxxxxxxxxxxx>
Sent: 26 March 2020 00:54
To: oracle-l@xxxxxxxxxxxxx; Mladen Gogala
Subject: Re: Copy Blob data into Varchar2
Yes your point make sense as if data is real binary then select will display
junk character. This current data is somehow stored by a third party
application but has all text data. Not sure if this is kept blob due to some
On Wednesday, March 25, 2020, 01:12:41 PM EDT, Mladen Gogala
The only type that realistically can be converted to VARCHAR2 is CLOB.
Converting things like JPEG or MP3 to VARCHAR2 would take OCR or even more
complex speech recognition to do. Maybe Alexa or Siri could do it for you?
Personally, I would use pathologically eclectic rubbish lister to do that line
by line. I would read CLOB field into $clob and then do something like this my
@clob=split "\n",$clob; to split it into lines. I would then re-insert all the
lines from the @clob array as varchar2 columns.
On 3/24/20 11:14 PM, Sanjay Mishra (Redacted sender smishra_97 for DMARC) wrote:
Can someone share any function which can allow to insert BLOB data into
Varchar2 column? Most of the BLOB data is less than 32K but selecting the BLOB
using dbms_lob.substr( l_cur.mylob, 32000, 1 ) or utl_raw.cast_to_varchar2 gave
ORA-06502: PL/SQL: numeric or value error: character string buffer too small
Can someone share an example to convert data from BLOB to varchar ?
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