Create a Postgres database using python

问题:

I want to create Postgres database using Python.

con = psql.connect(dbname='postgres',       user=self.user_name, host='',       password=self.password)  cur = con.cursor() cur.execute("CREATE DATABASE %s  ;" % self.db_name) 

I am getting the following error:

InternalError: CREATE DATABASE cannot run inside a transaction block 

I am using psycopg2 to connect. I don't understand what's the problem. What am I trying to do is to connect to database (Postgres):

psql -postgres -U UserName 

And then create another database:

create database test; 

This is what I usually do and I want to automate this by creating Python script.

回答1:

Use ISOLATION_LEVEL_AUTOCOMMIT, a psycopg2 extensions:

No transaction is started when command are issued and no commit() or rollback() is required.

import psycopg2 from psycopg2.extensions import ISOLATION_LEVEL_AUTOCOMMIT # <-- ADD THIS LINE  con = psycopg2.connect(dbname='postgres',       user=self.user_name, host='',       password=self.password)  con.set_isolation_level(ISOLATION_LEVEL_AUTOCOMMIT) # <-- ADD THIS LINE  cur = con.cursor() cur.execute("CREATE DATABASE %s  ;" % self.db_name) 

回答2:

As shown in the other answer the connection must be in autocommit mode. Another way of setting it using psycopg2 is through the autocommit attribute:

import psycopg2  con = psycopg2.connect(...) con.autocommit = True  cur = con.cursor() cur.execute('CREATE DATABASE {};'.format(self.db_name)) 

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