Category "sqlalchemy"

PendingRollbackError when accessing test database in FastAPI async test

I'm trying to mimic Django behavior when running tests on FastAPI: I want to create a test database in the beginning of each test, and destroy it in the end. Th

m1 macos can't install hdbcli

I have a script that starts with import pandas as pd from sqlalchemy import create_engine, text hana_engine = create_engine(os.getenv('RCF_HANA_URI'), echo=Fal

How to delete or modify a database table using Flask-SQLAlchemy?

Is there a way to delete or modify a table using flask-sqlalchemy? I am working on a Flask-based web app. I switched to flask-sqlalchemy as my project is on Her

Error connecting to DB2 with python and sqlalchemy - Connection info needed in SQLAlchemy format

I'm trying to connect to an IBM DB2 database using SQLAlchemy connection format but it keeps failing to connect. I am using these libraries: !pip install sqlalc

Airflow + sqlalchemy short-lived connections to metadata db

I deployed the latest airflow on a centos 7.5 vm and updated sql_alchemy_conn and result_backend to postgres databases on a postgresql instance and designated m

Async SqlAlchemy with FastAPI: Getting single session for all requests

I have recently migrated a REST API coded with FastApi to the new SQLAlchemy 1.4+ Async Version. My app compiles correctly and the database seems to setup just

SQLAlchemy multi column constraint

I have a number of tables in different schemas, I used the pattern from the docs. Some of my tables require multi column constraints and it was unclear what th

ForeignKey error in ormar has no attribute 'get_column_alias'

I'm testing out ormar to avoid having to create models for both api and database and ran into an issue with foreignkey assignment I can't seem to figure out. Th

How can I delete both the user and their post at the same time in my Flask App

In my head this is supposed to be easy but it's challenging me a little bit. I am trying to delete a user along with their post on a blog. However, I am not hav

Apply a filter to an automatically joined table

Here's my SQL setup create table a ( id serial primary key, ta text ); create table b ( id serial primary key,

Connecting to an Azure database using SQLAlchemy in Python

I am trying to connect to an Azure database using SQLAlchemy in Python. My code is the following: engine_azure = \ create_engine('mssql+pyodbc://{Server admin

AttributeError: module 'sqlalchemy' has no attribute 'NullType'

I am trying to configure flask SQLAlchemy with MySQLWorkBench, The following command works good: flask db migrate -m'Config' But when I try to execute flask db

SQLModel: how to load specific columns?

I tried to load specific columns from a table via the following method: from sqlalchemy.orm import load_only from sqlmodel import (Field, Session, SQLModel, cre

Does SQLAlchemy support Pervasive PSQL? connection string for it?

I googled and found this sqlalchemy-pervasive dialect. I pipped it, but I have no idea how to use it. What is connection string to pass to create_engine(.....)

SQLAlchemy: delete rows from associate table from many-to-many relationship

I noticed that when deleting one entry, the corresponding rows from the secondary table are not deleted. here my models: cashflows_tags_table = Table( "cash

SQLAlchemy update multiple rows in one transaction

How can I update multiple, existing rows in a database, using dictionary that maps existing values for one column, to the required new values for another column

SQLAlchemy: What is the best way to validate a model before inserting or updating

I'm trying to validate a SQLAlchemy model before it is inserted or updated, e.g class MyModel(db.Model): foo = db.Column(db.String(255)) bar = db.Colum

flask-sqlalchemy delete query failing with "Could not evaluate current criteria in Python"

I have a query using flask-sqlalchemy in which I want to delete all the stocks from the database where there ticker matches one in a list. This is the current q

sqlalchemy.exc.OperationalError: (sqlite3.OperationalError) unknown database "mydb"

I have a problem to use flask_alchemy for my unit test function In the production environment I use a postgresql database "SQLALCHEMY_DATABASE_URI": "postgresql

How to query an array of FLOAT?

I have a table with a column with type double precision[] created like this: from sqlalchemy import Column, String, ARRAY mytablename= 'mytable' class creat