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Thread: How to sql scripts in a file?

How to sql scripts in a file?

From

John Zhang

Date:

23 April 2020, 15:42:46

Hello all,

I have a need to execute sql scripts in a file with comments in Python 2.7.

here is m code snippet:

sqlF = r'{}\{}'.format(sFldr_sql,sSQLFile)
sql_file_contents = open(sqlF,'r').read()

cur.execute(sql_file_contents)

the file can be executed from pgAdmin successfully. However, the code above runs quietly without any issues raised but NO results was worked out.

In the sql file, there are scripts to DROP FUNCTION IF EXISTS and CREATE OR REPLACE FUNCTION.

Your input to shed light on it would be much appreciated.

Thank you

Yours sincerely,

John Zhang

Fwd: How to sql scripts in a file?

From

Sándor Daku

Date:

23 April 2020, 16:08:19

On Thu, 23 Apr 2020 at 14:43, John Zhang <johnzhang06@gmail.com> wrote:

Hello all,

I have a need to execute sql scripts in a file with comments in Python 2.7.
here is m code snippet:

sqlF = r'{}\{}'.format(sFldr_sql,sSQLFile)
sql_file_contents = open(sqlF,'r').read()
cur.execute(sql_file_contents)

the file can be executed from pgAdmin successfully. However, the code above runs quietly without any issues raised but NO results was worked out.

Hi John,

Psycopg2 I guess.

You have to commit the changes with calling commit() on the connection(not on the cursor!).

Or - 2.5 and above - you can use cursors and connections as context managers and it will be taken care of automatically.

See details here: https://www.psycopg.org/docs/usage.html#transactions-control

Regards,

Sándor

Re: [postgis-users] How to sql scripts in a file?

From

Giuseppe Broccolo

Date:

23 April 2020, 16:37:24

Hi John,

I guess you are using Psycopg2 as driver to PostgreSQL here (please add further details about your setup).

Assuming Psycopg2: I guess that is because actions are not committed in your snippet. You may be interested to

set autocommit for the execution of the script, even better to manage properly transactions, see the documentation

here: https://www.psycopg.org/docs/usage.html#transactions-control

For instance, I'd use context managers for connectors and cursors (available from version 2.5):

sqlF = r'{}\{}'.format(sFldr_sql,sSQLFile)
with psycopg2.connect(...) as conn:   with conn.cursor() as cur:       curs.execute(open(sqlF,'r').read())

So that if no exception has been raised, the transaction is committed. In case of exception the transaction
is rolled back. Also the cursor is then properly closed, without affecting the transaction.

Giuseppe.

Il giorno gio 23 apr 2020 alle ore 13:43 John Zhang <johnzhang06@gmail.com> ha scritto:

Hello all,

I have a need to execute sql scripts in a file with comments in Python 2.7.
here is m code snippet:

sqlF = r'{}\{}'.format(sFldr_sql,sSQLFile)
sql_file_contents = open(sqlF,'r').read()
cur.execute(sql_file_contents)

the file can be executed from pgAdmin successfully. However, the code above runs quietly without any issues raised but NO results was worked out.

In the sql file, there are scripts to DROP FUNCTION IF EXISTS and CREATE OR REPLACE FUNCTION.

Your input to shed light on it would be much appreciated.

Thank you

--
Yours sincerely,

John Zhang

_______________________________________________
postgis-users mailing list
postgis-users@lists.osgeo.org
https://lists.osgeo.org/mailman/listinfo/postgis-users

Re: [postgis-users] How to sql scripts in a file?

From

John Zhang

Date:

23 April 2020, 19:08:54

Hello Giuseppe and Sándor Daku,

Thank you for the input. Yes, after conn.commit() is called, it works.

Cheers,

John

On Thu, Apr 23, 2020 at 9:37 AM Giuseppe Broccolo <g.broccolo.7@gmail.com> wrote:

Hi John,

I guess you are using Psycopg2 as driver to PostgreSQL here (please add further details about your setup).

Assuming Psycopg2: I guess that is because actions are not committed in your snippet. You may be interested to
set autocommit for the execution of the script, even better to manage properly transactions, see the documentation
here: https://www.psycopg.org/docs/usage.html#transactions-control
For instance, I'd use context managers for connectors and cursors (available from version 2.5):
sqlF = r'{}\{}'.format(sFldr_sql,sSQLFile)
with psycopg2.connect(...) as conn:   with conn.cursor() as cur:       curs.execute(open(sqlF,'r').read())
So that if no exception has been raised, the transaction is committed. In case of exception the transaction
is rolled back. Also the cursor is then properly closed, without affecting the transaction.
Giuseppe.
Il giorno gio 23 apr 2020 alle ore 13:43 John Zhang <johnzhang06@gmail.com> ha scritto:
Hello all,

I have a need to execute sql scripts in a file with comments in Python 2.7.
here is m code snippet:

sqlF = r'{}\{}'.format(sFldr_sql,sSQLFile)
sql_file_contents = open(sqlF,'r').read()
cur.execute(sql_file_contents)

the file can be executed from pgAdmin successfully. However, the code above runs quietly without any issues raised but NO results was worked out.

In the sql file, there are scripts to DROP FUNCTION IF EXISTS and CREATE OR REPLACE FUNCTION.

Your input to shed light on it would be much appreciated.

Thank you

--
Yours sincerely,

John Zhang

_______________________________________________
postgis-users mailing list
postgis-users@lists.osgeo.org
https://lists.osgeo.org/mailman/listinfo/postgis-users

Yours sincerely,

John Zhang