Re: loading file with en dash character into postgres 9.6.1 database

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: "Hu, Patricia" <Patricia(dot)Hu(at)finra(dot)org>
Cc: "pgsql general (pgsql-general(at)postgresql(dot)org)" <pgsql-general(at)postgresql(dot)org>
Subject: Re: loading file with en dash character into postgres 9.6.1 database
Date: 2017-07-11 20:15:34
Message-ID: 7517.1499804134@sss.pgh.pa.us
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"Hu, Patricia" <Patricia(dot)Hu(at)finra(dot)org> writes:
> The server and client encoding are both set to UTF8, and according to this http://www.fileformat.info/info/unicode/char/2013/index.htm en dash is a valid UTF8 character, but when running a script with insert statement with en dash character in it, I got the error below.
> psql:activity_type.lst:379: ERROR: invalid byte sequence for encoding "UTF8": 0x96

Well, that certainly isn't valid UTF8, so your script file isn't in UTF8.

> If I set client_encoding to WIN1252, the same file will be run ok

0x96 does seem to be an en-dash in WIN1252, so this is probably the
appropriate fix. Testing here says that PG will correctly convert
0x96 in WIN1252 to an en-dash (U+2013) in UTF8, so I think you are
getting the right thing inserted.

> but afterwards the en dash character showed up as "û", instead of the en dash character "-"

This indicates that your terminal program does *not* think its encoding
is WIN1252. Having loaded that script file, you need to revert
client_encoding to whatever your terminal program is using, or non-ASCII
characters are going to be displayed wrong.

A bit of poking around suggests that your terminal may be operating
with code page 437 or similar, as 0x96 is "û" in that encoding ---
according to Wikipedia, at least:
https://en.wikipedia.org/wiki/Code_page_437
I don't think Postgres supports that as a client_encoding setting,
so one way or another you're going to need to switch the terminal
program's character set setting.

regards, tom lane

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