How to delete a table in SQLAlchemy?

Question

I want to delete a table using SQLAlchemy.

Since I am testing over and over again, I want to delete the table my_users so that I can start from scratch every single time.

So far I am using SQLAlchemy to execute raw SQL through the engine.execute() method:

sql = text('DROP TABLE IF EXISTS my_users;') result = engine.execute(sql) 

However, I wonder if there is some standard way to do so. The only one I could find is drop_all(), but it deletes all the structure, not only one specific table:

Base.metadata.drop_all(engine)   # all tables are deleted 

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For example, given this very basic example. It consists on a SQLite infrastructure with a single table my_users in which I add some content.

from sqlalchemy import create_engine, Column, Integer, String, text from sqlalchemy.orm import sessionmaker from sqlalchemy.ext.declarative import declarative_base  engine = create_engine('sqlite://', echo=False) Base = declarative_base()  class User(Base):     __tablename__ = "my_users"      id = Column(Integer, primary_key=True)     name = Column(String)      def __init__(self, name):         self.name = name  # Create all the tables in the database which are # defined by Base's subclasses such as User Base.metadata.create_all(engine)  # Construct a sessionmaker factory object session = sessionmaker()  # Bind the sessionmaker to engine session.configure(bind=engine)  # Generate a session to work with s = session()  # Add some content s.add(User('myname')) s.commit()  # Fetch the data print(s.query(User).filter(User.name == 'myname').one().name) 

For this specific case, drop_all() would work, but it won't be convenient from the moment I start having more than one table and I want to keep the other ones.

Answer 1

Just call drop() against the table object. From the docs:

Issue a DROP statement for this Table, using the given Connectable for connectivity.

In your case it should be:

User.__table__.drop() 

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If you get an exception like:

sqlalchemy.exc.UnboundExecutionError: Table object 'my_users' is not bound to an Engine or Connection. Execution can not proceed without a database to execute against 

You need to pass the engine:

User.__table__.drop(engine)