I have working listens_for function, which inserts LoadHistory object before updating Load: @event.listens_for(Load, 'before_update') def before_update_load(mapper, connection, target): current_load_select = select(load_fields).where(Load.id == target.id) insert_history = insert(LoadHistory).from_select(load_history_fields, current_load_select) connection.execute(insert_history) And the task is to have similar function but which will insert…
I create table in PostgreSQL and insert to table nested XML(xml_part column): CREATE TABLE text_xml ( id numeric, xml_part XML ); insert into text_xml values (1, '<note><to>Tove</to><from>Jani</from><heading>Reminder</heading><body>Dont forget me this weekend!</body></note>'); insert into text_xml values (2, '<note><to>Tove</to><from>Alex</from><heading>Reminder</heading><body>Dont forget me this…
The title says it all. Here is the code snippet. async with EngineContext(uri=URI) as engine: session = async_sessionmaker(bind=engine, expire_on_commit=True)() async with session.begin(): stmt: Select = select(User).order_by(_GenerativeSelect__first=User.login_date.desc()).limit(limit=10) result = await session.execute(statement=stmt) Equivalent to the very simple query, SELECT * FROM User…
My app is creating sqlalchemy.Tables from a MySQL database and as it use tinyint(1) as boolean after select.select_from.all i am getting values with int instead of boolean. After that i am using json.dumps to pass it to a js receiver…
I have below PostgreSQL table, which is small sample of huge table employee emp_id | salary | rating | increment_year -------------------------------------- 28 3000 1 2023 25 2000 2 2023 30 1500 1 2021 28 1000 3 2022 32 1200 1…
I have created a table using the flask db migrate method. Below is how my model is class MutualFundsDataTest(db.Model): id = db.Column(db.Integer, primary_key=True, autoincrement=True) Name = db.Column(db.Text, nullable=False) MF_Code = db.Column(db.Text, nullable=False) Scheme_Code_Direct = db.Column(db.Text, nullable=True) Scheme_Code_Regular = db.Column(db.Text, nullable=True)…
Passing "SELECT"-based SQL queries works. But passing "DELETE"- or "GRANT"-based SQL executed in python without error but makes no change to my database (python 3.8, sqlalchemy 2.0.10). These "DELETE" and "GRANT" queries worked in Python 3.6, sqlalchemy 1.3.23. I could…
I need to use triggers in postgresql (preferably via SQLALchemy ORM). However, I can't seem to get to first base with creating one. As a basic test, I am trying to put the string "Hello world" into a column called…
I have an SQLAlchemy entity written for PostgreSQL dialect and it uses server_default=func.clock_timestamp(): row_created = sa.Column('row_created_', sa.DateTime(timezone=True), server_default=func.clock_timestamp(), nullable=False) I also need to use it with SQLite, which throws an error: sqlalchemy.exc.OperationalError: (sqlite3.OperationalError) unknown function: clock_timestamp() How do I make…
I am using SQLAlchemy ORM. I have a Parent class and a Child class. Parent and Child are in a one-to-many relationship. A Parent has many children, potentially even 20k-30k. Here's how my classes are set up class Parent(Base): __tablename__…