I have an ETL that creates a plain text that later will be loaded into Teradata, in the source data there is a column UTF8 enconded that has all kind of characters including non printable, I properly write the file but i get Error Code 6706: The string contains an untranslatable character.
This is the destiny column
column VARCHAR(300) CHARACTER SET LATIN NOT CASESPECIFIC
I can load characters like this é but not characters like this ’
How can I properly write the file, and validate before sending the data, I don't have access to the data base just know that they get the error Code 6706.
Thanks in advance
Make column as unicode...
column VARCHAR(300) CHARACTER SET unicode NOT CASESPECIFIC.
Related
I am using DBI package in R to connect to teradata this way:
library(teradatasql)
query <- "
SELECT sku, description
FROM sku_table
WHERE sku = '12345'
"
dbconn <- DBI::dbConnect(
teradatasql::TeradataDriver(),
host = teradataHostName, database = teradataDBName,
user = teradataUserName, password = teradataPassword
)
dbFetch(dbSendQuery(dbconn, query), -1)
It returns a result as follows:
SKU DESCRIPTION
12345 18V MAXâ×¢ Collated Drywall Screwgun
Notice the bad characters â×¢ above. This is supposed to be superscript TM for trademarked.
When I use SQL assistant to run the query, and export the query results manually to a CSV file, it works fine as in the DESCRIPTION column has correct encoding.
Any idea what is going on and how I can fix this problem? Obviously, I don't want a manual step of exporting to CSV and re-reading results back into R data frame, and into memory.
The Teradata SQL Driver for R (teradatasql package) only supports the UTF8 session character set, and does not support using the ASCII session character set with a client-side character set for encoding and decoding.
If you have stored non-LATIN characters in a CHARACTER SET LATIN column in the database, and are using a client-side character set to encode and decode those characters for the "good" case, that will not work with the teradatasql package.
On the other hand, if you used the UTF8 or UTF16 session character set to store Unicode characters into a CHARACTER SET UNICODE column in the database, then you will be able to retrieve those characters successfully using the teradatasql package.
I have a text column in a table which I need to validate to recognize which records have non UTF-8 characters.
Below is an example record where there are invalid characters.
text = 'PP632485 - Hala A - prace kuchnia Zepelin, wymiana muszli, monta􀄪 tablic i uchwytów na r􀄊czniki, wymiana zamka systemowego'
There are over 3 million records in this table, so I need to validate them all at once and get the rows where this text column has non UTF-8 characters.
I tried below:
instr(text, chr(26)) > 0 - no records get fetched
text LIKE '%ó%' (tried this for a few invalid characters I noticed) - no records get fetched
update <table> set text = replace(text, 'ó', 'ó') - no change seen in text
Is there anything else I can do?
Appreciate your input.
This is Oracle 11.2
The characters you're seeing might be invalid for your data, but they are valid AL32UTF8 characters. Else they would not be displayed correctly. It's up to you to determine what character set contains the correct set of characters.
For example, to check if a string only contains characters in the US7ASCII character set, use the CONVERT function. Any character that cannot be converted into a valid US7ASCII character will be displayed as ?.
The example below first replaces the question marks with string '~~~~~', then converts and then checks for the existence of a question mark in the converted text.
WITH t (c) AS
(SELECT 'PP632485 - Hala A - prace kuchnia Zepelin, wymiana muszli, monta􀄪 tablic i uchwytów na r􀄊czniki, wymiana zamka systemowego' FROM DUAL UNION ALL
SELECT 'Just a bit of normal text' FROM DUAL UNION ALL
SELECT 'Question mark ?' FROM DUAL),
converted_t (c) AS
(
SELECT
CONVERT(
REPLACE(c,'?','~~~~~')
,'US7ASCII','AL32UTF8')
FROM t
)
SELECT CASE WHEN INSTR(c,'?') > 0 THEN 'Invalid' ELSE 'Valid' END as status, c
FROM converted_t
;
Invalid
PP632485 - Hala A - prace kuchnia Zepelin, wymiana muszli, montao??? tablic i uchwyt??w na ro??Sczniki, wymiana zamka systemowego
Valid
Just a bit of normal text
Valid
Question mark ~~~~~
Again, this is just an example - you might need a less restrictive character set.
--UPDATE--
With your data: it's up to you to determine how you want to continue. Determine what is a good target data set. Contrary to what I set earlier, it's not mandatory to pass a "from dataset" argument in the CONVERT function.
Things you could try:
Check which characters show up as '�' when converting from UTF8 at AL32UTF8
select * from G2178009_2020030114_dinllk
WHERE INSTR(CONVERT(text ,'AL32UTF8','UTF8'),'�') > 0;
Check if the converted text matches the original text. In this example I'm converting to UTF8 and comparing against the original text. If it is different then the converted text will not be the same as the original text.
select * from G2178009_2020030114_dinllk
WHERE
CONVERT(text ,'UTF8') = text;
This should be enough tools for you to diagnose your data issue.
As shown by previous comments, you can detect the issue in place, but it's difficult to automatically correct in place.
I have used https://pypi.org/project/ftfy/ to correct invalidly encoded characters in large files.
It guesses what the actual UTF8 character should be, and there are some controls on how it does this. For you, the problem is that you have to pull the data out, fix it, and put it back in.
So assuming you can get the data out to the file system to fix it, you can locate files with bad encodings with something like this:
find . -type f | xargs -I {} bash -c "iconv -f utf-8 -t utf-16 {} &>/dev/null || echo {}"
This produces a list of files that potentially need to be processed by ftfy.
My Oracle 11g is configured with AL32UTF8
NLS_CHARACTERSET AL32UTF8
Why does the tilde-N display as tilde-N in the second record, but the Acute-I and K
not display with Acute-I and K in the first record?
Additional Information:
The hex code for the Accent-I is CD
When I take the HEX code from the dump and convert it using UNISTR(), the character displays with the accent.
select
unistr('\0052\0045\0059\004B\004A\0041\0056\00CD\004B')
as hex_to_unicode
from dual;
This is probably an issue with whatever client you are using to display the results than your database. What are you using?
You can check if the database results are correct using the DUMP function. If the value in your table has the correct byte sequence for your database character set, you're good.
Edit:
OK, I'm pretty sure your data is bad. You're talking about
LATIN CAPITAL LETTER I WITH ACUTE, which is Unicode code point U+00CD. That is not the same as byte 0xCD. You're using database character set AL32UTF8, which uses UTF-8 encoding. The correct UTF-8 encoding for the U+00CD character is the two-byte sequence 0xC38D.
What you have is UTF-8 byte sequence 0xCD4B, which I'm pretty sure is invalid.
The Oracle UNISTR function takes the code point in UCS-2 encoding, which is roughly the same as UTF-16, not UTF-8.
Demonstration here: http://sqlfiddle.com/#!4/7e9d1f/1
My Oracle DB is in ALT16UTF16 charcter set.I need to generetae unicode text file which should be imported in another DB in AL32UTF8 encoding. I use for this a PL/sql code which calls the DBMS_XSLPROCESSOR.CLOB2FILE procedure.
In my code process:
1st ,I use an NCLOB to store the unicode lines which contains a chinese characters.
then I call the procedure as: DBMS_XSLPROCESSOR.CLOB2FILE(v_file, DIRE, fileName,873)
where v_file is the NCLOB variable which contains the file and 873 is the Oracle characteset of AL32UTF8
However when I check in the text file I find ¿¿ instead of the chinese caracters, could you help to resolve this or if you can suggest another procedure other than DBMS_XSLPROCESSOR.CLOB2FILE which allow writing a large file with the chinese caracters which is extracted from non unicode DB ?
Many Thanks
When I am trying to paste the character » (right double angle quotes) in Unix from my Notepad, it's converting to /273. The corresponding Hex value is BB and the Decimal value is 187.
My actual requirement is to have this character as the file delimiter when I export a .dat file from a database table. So, this character was put in as the delimiter after each column name. But, while copy-pasting, it's getting converted to /273.
Any idea about how to fix this? I am on Solaris (SunOS 5.10).
Thanks,
Visakh
ASCII only defines the character codes up to 127 (0x7F) - everything after that is another encoding, such as ISO-8859-1 or UTF-8. Make sure your locale is set to the encoding you are trying to use - the locale command will report your current locale settings, the locale(5) and environ(5) man pages cover how to set them. A much more in-depth introduction to the whole character encoding concept can be found in Joel Spolsky's The Absolute Minimum Every Software Developer Absolutely, Positively Must Know About Unicode and Character Sets (No Excuses!)
The character code 0xBB is shown as » in the IS0-8859-1 character chart, so that's probably the character set you want, so the locale would be something like en_US.ISO8859-1 for that character set with US/English messages/date formats/currency settings/etc.