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      Questions tagged [sqlalchemy]

      SQLAlchemy is a Python SQL toolkit and Object Relational Mapper that gives application developers the full power and flexibility of SQL.

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      How to keep connection with mariadb using SQLAlchemy? I got two parameters (pool_recycle, connect_args) what is difference of that?

      I'm trying to connect mariadb using create_engine of sqlalchemy. When I made connection like below, I sometimes got error that is "2006, MySQL server gone away". from sqlalchemy import ...
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      In sqlalchemy can we calculate a parent column as true if all its Child column are true

      class Parent(Base): __tablename__ = "Parent" parent_id = Column(Integer, primary_key=True) complete = Column(Boolean) children = relationship("Child", ...
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      How do I find out if there are any strings matching sha1 hash of SALT + string in PostgreSQL using SQLAlchemy

      How do I find out if there are any row where field matches sha1 hash of SALT + string in PostgreSQL using SQLAlchemy
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      SQLAlchemy Multiple Join Paths.failed to locate the User class. SQLalchemy versioned_history

      I'm having trouble with multiple join paths. So I'm using Flask with SQLAlchemy Flask-authorize Flask-login and sqlalchemy versioned_history https://docs.sqlalchemy.org/en/14/orm/examples.html#module-...
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      29 views

      SQLAlchemy - How can I join tables with common foreign key?

      I have the following tables. CREATE TABLE transformer ( id_transformer TEXT PRIMARY KEY, age INTEGER, nominal_voltage REAL ); /* MEASUREMENTS */ CREATE TABLE oil_quality ( ...
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      12 views

      SQLAlchemy Single Table Multiple Models + Mixin

      New to Python, SQLAlchemy and alembic. Been trying to define a mixin: class Mixin(Base): __abstract__ = True col_mixin_1 = ... col_mixin_2 = ... ... Then, define a common base class: ...
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      20 views

      Alembic autogenerate not detecting current state

      Problem I'm using Alembic autogenerate to migrate some model changes. I run alembic revision/upgrade once and it properly creates my table and adds an alembic_version table to my database. When I go ...
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      25 views

      AttributeError: 'Connection' object has no attribute 'is_connected'

      I am working on a short project that deals with simple MySQL-python functions and came with an error. Using sqlalchemy, I have tried connecting MySQL and python but an error keeps popping up. ...
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      14 views

      Passing data from flask backend to javascript in html file [duplicate]

      Im trying to pass a list of users (sqlalchemy) from a flask backend into javascript within a html file. I have tried passing it as a list of User objects and turning the list into json and passing it ...
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      21 views

      Multiple conditions for joined the table's column in SQLAlchemy

      I have two models: class Room(Base, SerializerMixin): __tablename__ = "rooms" id = Column(String, primary_key=True) last_updated = Column(Integer) participants = ...
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      28 views

      Can infinity be stored in a SQLite JSON1 column? [duplicate]

      Use Case I'm using SQLAlchemy and SQLite for a standalone application (non-web) and I need to store numerical ranges in a database. I'm doing this by saving the start and end of each range in SQLite ...
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      19 views

      SQLAlchemy not finding a table to generate a foreign key [closed]

      Im working with 3 tables but failing when working with my third one, surf spot images. Im thinking it could be that Im missing a relationship? The tables are: towns: which have many surf spots, surf ...
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      41 views

      SQLlite order_by returning an empty list [closed]

      I'd like to return the top ten score from the database but I get an empty list [,] in return instead. from app.base.models import User, Description @blueprint.route("/Leaderboard") def ...
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      22 views

      sqlalchemy.exc.OperationalError sqlalchemy.exc.OperationalError: (sqlite3.OperationalError) no such column:

      CRUD application to add,show,delete records. I know the error is id = db.Column(db.Integer, primary_key = True). If i change that to id = db.Column('student_id',db.Integer, primary_key = True) then ...
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      No module named 'sqlalchemy'

      There's an issue with from sqlalchemy.orm import relationship, when I try to run my app with that import, ModuleNotFoundError is raised and it says No module named 'sqlalchemy'. But when I delete the ...

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