Is there some kind of mapping a data type's oid to its name?

Driver version

2.0.905

Redshift version

PostgreSQL 8.0.2 on i686-pc-linux-gnu, compiled by GCC gcc (GCC) 3.4.2 20041017 (Red Hat 3.4.2-6.fc3), Redshift 1.0.36224��

Client Operating System

Darwin Nativs-MacBook-Pro.local 21.4.0 Darwin Kernel Version 21.4.0: Mon Feb 21 20:34:37 PST 2022; root:xnu-8020.101.4~2/RELEASE_X86_64 x86_64

Python version

3.8.7

Problem description

I was wondering if there is some a way for to convert a data type type_oid into string instead.

cursor.execute("SELECT int_col from some_table")
description = cursor.description
oid = description[0][1]
print(oid)  # will print oid. for the sake of example let's say it's 1
print(some_func(oid)). # "int"

in psycopg2 there is the https://www.psycopg.org/docs/extensions.html#psycopg2.extensions.string_types

so I’m looking for something similar, but for redshift data types.

Thanks in advance!

[Brooke-white]

Hi @ni-todo-spot – we’ve just released v2.0.908 which includes support for this feature as noted above.

from redshift_connector.utils.oids import get_datatype_name
get_datatype_name(1266)
Out[3]: 'TIMETZ'
get_datatype_name(23)
Out[4]: 'INTEGER'

I’ll be closing this issue but feel free to open a new one if you see any issue with this feature or need any help. Thanks again for working with us to improve redshift-connector! 😃

[Brooke-white]

Hey @ni-todo-spot,

To clarify my second comment a bit, these IN/OUT function mappings are defined for Redshift, not postgres despite their name starting with pg_ (we need to fix this, I’m hoping to fit in our next release).

I took a look into implementing this yesterday and came up with an approach using IntEnum that will provide the desired functionality and clean up our codebase a bit. Here’s an example of how it will work

Python 3.9.0 (v3.9.0:9cf6752276, Oct  5 2020, 11:29:23) 
Type 'copyright', 'credits' or 'license' for more information
IPython 7.19.0 -- An enhanced Interactive Python. Type '?' for help.
PyDev console: using IPython 7.19.0
Python 3.9.0 (v3.9.0:9cf6752276, Oct  5 2020, 11:29:23) 
[Clang 6.0 (clang-600.0.57)] on darwin
from redshift_connector.utils.oids import get_datatype_name
get_datatype_name(1266)
Out[3]: 'TIMETZ'
get_datatype_name(23)
Out[4]: 'INTEGER'

We should be able to get this in our release scheduled for July 😃