Connecting postgresql with sqlalchemy
PythonDatabasePostgresqlOrmSqlalchemyPython Problem Overview
I know this might be really a simple question but I don't know the solution. What is happening here when I try to connect to postgresql? I am self learner in this field of database and programming so please be gentle with me. When I try following code:
import sqlalchemy
db = sqlalchemy.create_engine('postgresql:///tutorial.db')
I get this error:
> Traceback (most recent call last):
File "
Do I need to install psycopg2 separately? What is the correct connection string for postgresql?
Python Solutions
Solution 1 - Python
You would need to pip install SQLAlchemy and pip install psycopg2.
An example of a SQLAlchemy connection string that uses psycopg2:
from sqlalchemy import create_engine
engine = create_engine('postgresql+psycopg2://user:password@hostname/database_name')
You could also connect to your database using the psycopg2 driver exclusively:
import psycopg2
conn_string = "host='localhost' dbname='my_database' user='postgres' password='secret'"
conn = psycopg2.connect(conn_string)
However, using the psycopg2 driver to connect does not take advantage of SQLAlchemy.
Solution 2 - Python
Yes, psycopg2 are basically the Python drivers for PostgreSQL that need to be installed separately.
A list of valid connection strings can be found here, yours is a bit off (you need to the username, the password and hostname as specified in the link below):
http://docs.sqlalchemy.org/en/latest/core/engines.html#postgresql
Solution 3 - Python
Yes, you need to install psycopg2 separately, if you're using linux you can simply enter the following line to the terminal: $pip install psycopg2 if this doesn't work try using sudo: $sudo pip install psycopg2