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

From Giuseppe Broccolo
Subject Re: [postgis-users] How to sql scripts in a file?
Date
Msg-id CAFtuf8D_vPyEqmUdqOgr2GkBHePt-EPeJRzJYA26FXGwN54Gzg@mail.gmail.com
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In response to How to sql scripts in a file?  (John Zhang <johnzhang06@gmail.com>)
Responses Re: [postgis-users] How to sql scripts in a file?  (John Zhang <johnzhang06@gmail.com>)
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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

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


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