Python psycopg2 not inserting into postgresql table

Question

I’m using the following to try and insert a record into a postgresql database table, but it’s not working. I don’t get any errors, but there are no records in the table. Do I need a commit or something? I’m using the postgresql database that was installed with the Bitnami djangostack install.

import psycopg2

try:
    conn = psycopg2.connect("dbname='djangostack' user='bitnami' host='localhost' password='password'")
except:
    print "Cannot connect to db"

cur = conn.cursor()

try:
    cur.execute("""insert into cnet values ('r', 's', 'e', 'c', 'w', 's', 'i', 'd', 't')""")
except:
    print "Cannot insert"

Asked By: Superdooperhero

||

Source

Answer 1

Turns out I needed conn.commit() at the end

Answered By: Superdooperhero

Answer 2

If don’t want to have to commit each entry to the database, you can add the following line:

conn.autocommit = True

So your resulting code would be:

import psycopg2

try:
    conn = psycopg2.connect("dbname='djangostack' user='bitnami' host='localhost' password='password'")
    conn.autocommit = True
except:
    print "Cannot connect to db"

cur = conn.cursor()

try:
    cur.execute("""insert into cnet values ('r', 's', 'e', 'c', 'w', 's', 'i', 'd', 't')""")
except:
    print "Cannot insert"

Answered By: aright

Answer 3

psycopg2 is Python DB API-compliant, so the auto-commit feature is off by default. You need to call conn.commit to commit any pending transaction to the database. As connections (and cursors) are context managers, you can simply use the with statement to automatically commit/rollback a transaction on leaving the context:

with conn, conn.cursor() as cur:  # start a transaction and create a cursor
    cur.execute(sql)

From the docs:

When a connection exits the with block, if no exception has been
raised by the block, the transaction is committed. In case of
exception the transaction is rolled back.

When a cursor exits the with block it is closed, releasing any
resource eventually associated with it. The state of the transaction
is not affected.

Answered By: Eugene Yarmash

Answer 4

import psycopg2
conn = psycopg2.connect("dbname='djangostack' user='bitnami' 
host='localhost' password='password'")
con.set_session(autocommit=True)

Answered By: heaven2sai

Python psycopg2 not inserting into postgresql table

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