Обсуждение: encode(bytea_value, 'escape') in PostgreSQL 9.0
The old 'escape' encoding used by PostgreSQL 8.4 and prior was pretty helpful for getting human-readable strings in psql. It seems this functionality was removed in PostgreSQL 9.0. Was this an accident or a deliberate decision? Could we get it back, please? -- Florian Weimer <fweimer@bfk.de> BFK edv-consulting GmbH http://www.bfk.de/ Kriegsstraße 100 tel: +49-721-96201-1 D-76133 Karlsruhe fax: +49-721-96201-99
Florian Weimer <fweimer@bfk.de> writes:
> The old 'escape' encoding used by PostgreSQL 8.4 and prior was pretty
> helpful for getting human-readable strings in psql. It seems this
> functionality was removed in PostgreSQL 9.0. Was this an accident or
> a deliberate decision? Could we get it back, please?
I think you're looking for "set bytea_output = escape".
regards, tom lane
* Tom Lane: > Florian Weimer <fweimer@bfk.de> writes: >> The old 'escape' encoding used by PostgreSQL 8.4 and prior was pretty >> helpful for getting human-readable strings in psql. It seems this >> functionality was removed in PostgreSQL 9.0. Was this an accident or >> a deliberate decision? Could we get it back, please? > > I think you're looking for "set bytea_output = escape". To me, this seems problematic as a general recommendation because programs won't use this, and it's confusing to have different output in psql than what your program sees. That's why I don't want to put it into .psqlrc. The separate command will raise a few eyebrows here and there. 8-/ Put differently, I think it's rather odd that in 9.0, both encode(bytea_value, 'escape') and encode(bytea_value, 'hex') output hexadecimal values. There's also an explicit way to request such output, so I don't think that encode() should obey the bytea_output setting. In 8.4's psql, a BYTEA column and its escape-encoded TEXT were displayed differently, so there is precedent. -- Florian Weimer <fweimer@bfk.de> BFK edv-consulting GmbH http://www.bfk.de/ Kriegsstraße 100 tel: +49-721-96201-1 D-76133 Karlsruhe fax: +49-721-96201-99
Florian Weimer <fweimer@bfk.de> writes:
> Put differently, I think it's rather odd that in 9.0, both
> encode(bytea_value, 'escape') and encode(bytea_value, 'hex') output
> hexadecimal values.
I don't believe that; encode produces text not bytea, so its result
is not affected by this setting.
regards, tom lane
* Tom Lane: > Florian Weimer <fweimer@bfk.de> writes: >> Put differently, I think it's rather odd that in 9.0, both >> encode(bytea_value, 'escape') and encode(bytea_value, 'hex') output >> hexadecimal values. > > I don't believe that; encode produces text not bytea, so its result > is not affected by this setting. And you are right, as usual. It turns out that we've got a double-encoding issue in the loader. How embarrassing. -- Florian Weimer <fweimer@bfk.de> BFK edv-consulting GmbH http://www.bfk.de/ Kriegsstraße 100 tel: +49-721-96201-1 D-76133 Karlsruhe fax: +49-721-96201-99
On 2010-12-06, Florian Weimer <fweimer@bfk.de> wrote: > * Tom Lane: > >> Florian Weimer <fweimer@bfk.de> writes: >>> The old 'escape' encoding used by PostgreSQL 8.4 and prior was pretty >>> helpful for getting human-readable strings in psql. It seems this >>> functionality was removed in PostgreSQL 9.0. Was this an accident or >>> a deliberate decision? Could we get it back, please? >> >> I think you're looking for "set bytea_output = escape". > To me, this seems problematic as a general recommendation because > programs won't use this, programs should be using libpq's unescape_bytea and thus be immune to changes in the representation. If you want predictable representation base64 (or hex) your data and store it in a text column postgres will compress long values so not hardly any space will be wasted. > and it's confusing to have different output > in psql than what your program sees. That's why I don't want to put > it into .psqlrc. The separate command will raise a few eyebrows here > and there. 8-/ ALTER DATABASE whatever SET bytea_output = escape; or ALTER USER whoever SET bytea_output = escape; -- ⚂⚃ 100% natural