Re: Issue with loading unicode characters with copy command

On 1/12/24 07:23, Kiran K V wrote:
> Hi,
>
>
> I have a UTF8 database and simple table with two columns (integer and
> varchar). Created a csv file with some multibyte characters and trying
> to perform load operation using the copy command.

The multibyte characters come from what character set?

>
> __ __
>
> Database info:____
>
> Postgresql database details:____
>
>    Name    |  Owner   | Encoding |      Collate       |
> Ctype        |   Access privileges____
>
> -----------+----------+----------+--------------------+--------------------+-----------------------____
>
> postgres  | postgres | UTF8     | English_India.1252 |
> English_India.1252 |____
>
> __ __
>
> (Note: I also tried with collate utf8 and no luck)
>
>
> postgres=# set client_encoding='UTF8';____
>
> SET____
>
> __ __
>
> Table:____
>
> create table public.test ( PKCOL integer not null, STR1 character
> varying(64) null, primary key( PKCOL )) ____
>
> ____
>
> csv contents:____
>
> 1|"àáâãäåæçèéêëìíîï"____
>
> __ __
>
> After data loading, actual data is becoming____
>
> à áâãäåæçèéêëìÃîï____
>
> hex of this is -
> c2a1c2a2c2a3c2a4c2a5c2a6c2a7c2a8c2a9c2aac2abc2acc2aec2af____
>
> __ __
>
> The hex values are indeed the UTF-8 encodings of the characters in your
> expected string, and the presence of `C2` before each character is
> indicative of how UTF-8 represents certain characters.____
>
> In UTF-8, characters from the extended Latin set (like `à`, `á`, `â`,
> etc.) are represented as two bytes. The first byte `C2` or `C3`
> indicates that this is a two-byte character, and the second byte
> specifies the character. For example:____
>
> - `à` is represented as `C3 A0`____
>
> - `á` is `C3 A1`____
>
> - `â` is `C3 A2`, and so on.____
>
> In this case, the `C2` byte is getting interpreted as a separate
> character and that is the likely reason that an `Â` (which corresponds
> to `C2`) is seen before each intended character. Looks like UTF-8
> encoded data is mistakenly interpreted as Latin-1 (ISO-8859-1) or
> Windows-1252, where each byte is treated as a separate character.
>
>
> Please advise. Thank you very much.
>
>
> Regards,
>
> Kiran
>

--
Adrian Klaver
adrian(dot)klaver(at)aklaver(dot)com