Prompt Detail:
In SQLAlchemy, you can turn on the output of raw SQL by setting the echo
parameter to True
when creating the engine. Here is an example:
sqlfrom sqlalchemy import create_engine, MetaData, Table, Column, Integer, String
from sqlalchemy.orm import sessionmaker
# Define a database engine and metadata with echo=True
engine = create_engine('sqlite:///example.db', echo=True)
metadata = MetaData()
# Define a table
users_table = Table('users', metadata,
Column('id', Integer, primary_key=True),
Column('name', String),
Column('age', Integer))
# Create the table in the database
metadata.create_all(engine)
# Insert some data into the table
Session = sessionmaker(bind=engine)
session = Session()
session.add_all([
{'name': 'Alice', 'age': 25},
{'name': 'Bob', 'age': 30},
{'name': 'Charlie', 'age': 35},
])
session.commit()
# Define a query
query = session.query(users_table).filter_by(age=30)
# Execute the query (SQL output will be printed)
results = query.all()
In this example, we create the database engine with the echo
parameter set to True
. This will cause SQLAlchemy to print out the SQL statements it generates as it executes them. We then define a query and execute it using the all
method, which will return the results of the query. As the query is executed, SQLAlchemy will print out the SQL statement it generates.
The output of this code will be similar to the following:
sql2023-03-10 04:18:32,283 INFO sqlalchemy.engine.base.Engine SELECT users.id, users.name, users.age
FROM users
WHERE users.age = ?
2023-03-10 04:18:32,283 INFO sqlalchemy.engine.base.Engine (30,)
Note that the actual output may contain more information, including timing information and the actual values of the query parameters, depending on the echo
settings and other configuration options.