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I'm going to describe how DBD::mysql works. I suspect DBD::Pg works the same way.


Perl has two ways of storing strings. DBI or DBD::mysql looks at the internal buffer of scalars without checking which storage format was used, so every time you pass a string, it's as if you actually passed

use Encode qw( is_utf8 encode_utf8 ); is_utf8($string) ? encode_utf8($string) : $string

This is a bug, but it almost always does the right thing.


Workaround:

  • If you have a decoded string (a string of Unicode code points), you can use the following:
    use Encode qw( encode_utf8 ); $dbh->do("SET NAMES utf8"); my $sth = ...; $sth->execute(encode_utf8($decoded));
  • If you have a string encoded using cp1252, you can use the following:
    use Encode qw( decode ); $dbh->do("SET NAMES utf8"); my $sth = ...; $sth->execute(decode('cp1252', $encoded));
  • If you have a string encoded using cp1252 you want to avoid any encoding and decoding on the Perl side, you can use the following:
    sub _d { my ($s) = @_; utf8::downgrade($_); $s } $dbh->do("SET NAMES cp1252"); my $sth = ...; $sth->execute(_d($encoded));

Notes:

  • Passing mysql_enable_utf8=>1 to DBI->connect does $dbh->do("SET NAMES utf8"); for you. Later changes to mysql_enable_utf8 does not.
  • is_utf8 always returns true for strings returned by Encode::decode and Encode::decode_utf8.
  • is_utf8 always returns false for strings returned by Encode::encode, Encode::encode_utf8 and Encode::from_to.

In reply to Re: DBD::Pg encodes Perlstring to UTF-8 bytes instead of WIN1252 regardless client encoding by ikegami
in thread DBD::Pg encodes Perlstring to UTF-8 bytes instead of WIN1252 regardless client encoding by Pickwick

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