psycopg3 | New generation PostgreSQL database adapter for the Python | Database library
kandi X-RAY | psycopg3 Summary
kandi X-RAY | psycopg3 Summary
New generation PostgreSQL database adapter for the Python programming language
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QUESTION
What I'm working with:
CentOS Linux 7 (Core)
Python 3.9.10
pip 22.0.3
- Using
virtualenv
wherepip list
is
ANSWER
Answered 2022-Mar-03 at 08:41I use:
QUESTION
I have an application that collects crypto prices from decentralized exchanges (nothing commercial, the goal is mainly to learn some databases techs with real data). I got it working with MongoDB and PostgresSQL. However, I'm seeing massive differences when it comes to writes, in favour of MongoDB. I'm talking several orders of magnitude. I know MongoDB is a NoSQL db and is advertised to be more efficient for this kind of stuff, but I was wondering if I'm missing something with my postgres implementation. I'll describe below how I implemented the logic and I'll try to provide comparable metrics (as much as I can).
To talk to the databases, I use psycopg3 for the Postgres implementation, and pymongo for the MongoDB one.
Here is the data structure I'm writing to the databases:
...ANSWER
Answered 2022-Feb-20 at 18:18For batch import of data into Postgres generally the fastest way is to use the Postgres command COPY. In psycopg3
this is available via the procedures shown here psycopg3 COPY. The caveat is that COPY
is all or none, either all the data is imported or an error means none of it is imported.
QUESTION
I am reading text containing emojis from a Postgres 13 database. Turns out that my Python/psycopg query does not decode/return the text as I would expect.
Via Postgrespsql
client
Within
postgres:13
containerselect description from profile WHERE id = 123
Result is as expected!
...ANSWER
Answered 2022-Jan-12 at 15:49The emojis consist of several characters, and the shell you are using does not know how to display them in the way you want.
JosefZ posted a link for more details: https://emojipedia.org/emoji-sequence/
QUESTION
This does not work:
...ANSWER
Answered 2022-Jan-07 at 16:25Using an autocommit connection works for me:
QUESTION
I'm having a little difficulty understanding appropriate syntax for the psycopg3
library in Python. I'm trying to copy the contents of a .csv file into my database. The PostgreSQL documentation indicates copy
should be written as follows:
ANSWER
Answered 2021-Nov-06 at 04:26QUESTION
Hey I am new to Databases and I decided to use Postgresql for convinience. And I am using an adapter for the Python programming language of the database named Psycopg I followed the installation tutorial of Psycopg2 but I was getting an error so I decided to install psycopg3 and it installed successfully! but when I pass the database
parametere I get the following error:
ANSWER
Answered 2021-Oct-16 at 15:47QUESTION
I'm refactoring a python code base that is using psycopg2 to psycopg3.
The code has calls to .mogrify()
which is not present in psycopg3.
The code has something like this ensure that the strings are in UTF-8:
...ANSWER
Answered 2021-Dec-30 at 11:18The right way to handle encoding in both psycopg2 and psycopg3 is to
- set the encoding on the connection or via
SET client_encoding TO ...
- pass
str
values tocursor.execute
and let the connector handle encoding (and decoding)
So the correct code using psycopg3 is
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Install psycopg3
You can use psycopg3 like any standard Python library. You will need to make sure that you have a development environment consisting of a Python distribution including header files, a compiler, pip, and git installed. Make sure that your pip, setuptools, and wheel are up to date. When using pip it is generally recommended to install packages in a virtual environment to avoid changes to the system.
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