On 03/03/2017 06:31 PM, Евгений Рымарев wrote:
call_special_firebird_method
Not understand. What method? You mean fdb method?
yes, whatever workaround fdb gives you for this issue.
I found method _Connection__set_default_tpb and use it.
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app =Flask(__name__)
app.config.from_pyfile(filename='settings.py',silent=True)
db =SQLAlchemy(app=app)
engine =create_engine(settings.SQLALCHEMY_DATABASE_URI)
@event.listens_for(engine,'connect')
defreceive_connect(dbapi_connection,connection_record):
dbapi_connection._Connection__set_default_tpb(ISOLATION_LEVEL_READ_COMMITED_LEGACY)
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This function is performed, but the same result - error in logs about
"lock".
I know nothing about this issue on Firebird you'd need to ask on their
mailing list for how to deal with this situation.
пятница, 3 марта 2017 г., 20:08:45 UTC+3 пользователь Евгений Рымарев
написал:
Hello everyone!
I have Flask app with using flask_sqlalchemy:
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fromflask importFlask
fromflask_sqlalchemy importSQLAlchemy
app =Flask(__name__)
app.config.from_pyfile(filename='settings.py',silent=True)
db =SQLAlchemy(app=app)
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I want connect to same database from daemon. In daemon i just import
db and use db.engine.execute for SQLAlchemy queries.
But when daemon starts main app can't connect to database.
In log i see that:
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fdb.fbcore.DatabaseError:('Error while connecting to database:\n-
SQLCODE: -902\n- I/O error during "lock" operation for file
"main.fdb"\n- Database already opened with engine instance,
incompatible with current',-902,335544344)
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I trying use isolation level:
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fromfdb.fbcore importISOLATION_LEVEL_READ_COMMITED_LEGACY
classTPBAlchemy(SQLAlchemy):
defapply_driver_hacks(self,app_,info,options):
if'isolation_level'notinoptions:
options['isolation_level']=ISOLATION_LEVEL_READ_COMMITED_LEGACY
returnsuper(TPBAlchemy,self).apply_driver_hacks(app_,info,options)
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And replace this:
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db =SQLAlchemy()
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To:
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db =TPBAlchemy()
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But this only make another error:
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TypeError:Invalidargument(s)'isolation_level'sent to
create_engine(),usingconfiguration
FBDialect_fdb/QueuePool/Engine. Pleasecheck that the keyword
arguments are appropriate forthiscombination of components.
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I would appreciate the full example to address my issue.
Thanks!
--
SQLAlchemy -
The Python SQL Toolkit and Object Relational Mapper
http://www.sqlalchemy.org/
To post example code, please provide an MCVE: Minimal, Complete, and
Verifiable Example. See http://stackoverflow.com/help/mcve for a full
description.
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--
SQLAlchemy -
The Python SQL Toolkit and Object Relational Mapper
http://www.sqlalchemy.org/
To post example code, please provide an MCVE: Minimal, Complete, and Verifiable
Example. See http://stackoverflow.com/help/mcve for a full description.
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