I am urged to use Kafka with python. Moreover, I need to develop a very simple producer-consumer application that reads metrics from a device in real-time and then publishes them to a topic ‘metrics’ in Kafka. Then a consumer must subscribe to the ‘metrics’ topic and store those data t…
Tag: postgresql
Convert a list to comma separated strings for sql IN operator
This seems very obvious use case and I am surprised I was not able to find any single working solution for this. I have a method which returns a list of usernames something similar to this: Now I want to use this variable to build a sql for IN operator, something similar to this: above line obviously fails du…
python psycopg2 select current_timestamp problem with timezone
I’m calling a simple select to obtain current timestamp with timezone with psycopg2 and it’s retrieving UTC time instead of my local time (-3). datetime.datetime(2021, 1, 13, 20, 49, 47, 931834, tzinfo=psycopg2.tz.FixedOffsetTimezone(offset=0, name=None)) In postgresql I’m doing: This retrie…
column “e” of relation “analysis_result” does not exist
connection to postgresql database has been connected successfully.but while executing below query i am getting some kind of error which looks like : column “e” of relation “analysis_result” does not exist LINE 1: INSERT INTO analysis_result(user_id,E,A,C,N,O,total) VALUES … i und…
Python-Flask No response: After stayed active for one day
App description: I am using Python-Flask module with PostgreSql 12 as a REST API on a Web based application. There is a lot of request based heartbeat (JavaScript SetIntervals to send heartbeat almost for a every second and the CRUD operations for every user request on a small scale) and REST data (json data …
How to restore postgreSQL from dump file to AWS?
I have PostgreSQL dump file in my local environment, and I want to restore it on AWS server where Django app was deployed. I think I should upload the dump file to AWS server but I don’t know where it should be uploaded to and how to restore it. Answer First, copy your file from your local environment t…
asyncpg.exceptions.DataError: invalid input for query argument $1: 217027642536 (value out of int32 range)
I’m working on a project that uses FastAPI alongside Pydantic and SQLAlchemy. I’m also using encode/databases to manage database connections. But for some weird reason, I get asyncpg.exceptions.DataError: invalid input for query argument $1: 217027642536 (value out of int32 range) anytime I try sa…
Postgresql/psycopg2 password authentication error even though user and password are correct
I am new to web development in Python and would really appreciate some help. I am trying to set up psycopg2/peewee on WSL (Windows machine). In my Python code I store all of the info I’ll need to access a Postgres database, and then attempt to connect to the database as follows: I am certain that I have…
How to pass values to return redirect(url_for()) from one method to another in flask
I have a method in this I am extracting email id and mobile number from the database. I am using POSTGRES as database and using python language.I need to pass the value to the second method for the OTP purpose but I am running into an error. I have another method I need to access the email id and mobile
How to upsert pandas DataFrame to PostgreSQL table?
I’ve scraped some data from web sources and stored it all in a pandas DataFrame. Now, in order harness the powerful db tools afforded by SQLAlchemy, I want to convert said DataFrame into a Table() object and eventually upsert all data into a PostgreSQL table. If this is practical, what is a workable met…