There are a couple of related questions regarding this, but in my case, all those solutions is not working out. Thats why I thought of asking again. I am getting this error while I am firing below query using sqlalchemy orm.
Traceback (most recent call last):
File "MyFile.py", line 1010, in <module>
handler.handle(line.split('\t'))
File "MyFile.py", line 849, in handle
self.getRecord(whatIfFlag, id)
File "MyFile.py", line 143, in getRecord
newRecord = self.recordSearcher.getRecordByParams(name, pId)
File "abc.py", line 67, in getRecord
File "/opt/product/python/prod/bin/2.7.6/lib/python2.7/site-packages/SQLAlchemy-0.9.4-py2.7-linux-x86_64.egg/sqlalchemy/orm/query.py", line 2361, in one
ret = list(self)
File "/opt/product/python/prod/bin/2.7.6/lib/python2.7/site-packages/SQLAlchemy-0.9.4-py2.7-linux-x86_64.egg/sqlalchemy/orm/query.py", line 2404, in __iter__
return self._execute_and_instances(context)
File "/opt/product/python/prod/bin/2.7.6/lib/python2.7/site-packages/SQLAlchemy-0.9.4-py2.7-linux-x86_64.egg/sqlalchemy/orm/query.py", line 2419, in _execute_and_instances
result = conn.execute(querycontext.statement, self._params)
File "/opt/product/python/prod/bin/2.7.6/lib/python2.7/site-packages/SQLAlchemy-0.9.4-py2.7-linux-x86_64.egg/sqlalchemy/engine/base.py", line 720, in execute
return meth(self, multiparams, params)
File "/opt/product/python/prod/bin/2.7.6/lib/python2.7/site-packages/SQLAlchemy-0.9.4-py2.7-linux-x86_64.egg/sqlalchemy/sql/elements.py", line 317, in _execute_on_connection
return connection._execute_clauseelement(self, multiparams, params)
File "/opt/product/python/prod/bin/2.7.6/lib/python2.7/site-packages/SQLAlchemy-0.9.4-py2.7-linux-x86_64.egg/sqlalchemy/engine/base.py", line 817, in _execute_clauseelement
compiled_sql, distilled_params
File "/opt/product/python/prod/bin/2.7.6/lib/python2.7/site-packages/SQLAlchemy-0.9.4-py2.7-linux-x86_64.egg/sqlalchemy/engine/base.py", line 947, in _execute_context
context)
File "/opt/product/python/prod/bin/2.7.6/lib/python2.7/site-packages/SQLAlchemy-0.9.4-py2.7-linux-x86_64.egg/sqlalchemy/engine/base.py", line 1108, in _handle_dbapi_exception
exc_info
File "/opt/product/python/prod/bin/2.7.6/lib/python2.7/site-packages/SQLAlchemy-0.9.4-py2.7-linux-x86_64.egg/sqlalchemy/util/compat.py", line 185, in raise_from_cause
reraise(type(exception), exception, tb=exc_tb)
File "/opt/product/python/prod/bin/2.7.6/lib/python2.7/site-packages/SQLAlchemy-0.9.4-py2.7-linux-x86_64.egg/sqlalchemy/engine/base.py", line 940, in _execute_context
context)
File "/opt/product/python/prod/bin/2.7.6/lib/python2.7/site-packages/SQLAlchemy-0.9.4-py2.7-linux-x86_64.egg/sqlalchemy/engine/default.py", line 435, in do_execute
cursor.execute(statement, parameters)
File "build/bdist.linux-x86_64/egg/MySQLdb/cursors.py", line 205, in execute
File "build/bdist.linux-x86_64/egg/MySQLdb/connections.py", line 36, in defaulterrorhandler
sqlalchemy.exc.OperationalError: (OperationalError) (2013, 'Lost connection to MySQL server during query') ....
query = self.__session.query(MyTable).filter(and_(MyTable.NAME == name,MyTable.P_ID == p_id)
try:
record = query.one()
except NoResultFound:
new_record = MyTable(params)
self.__session.add(new_record)
self.__session.commit()
self.__session.close()
It is expected to return only one record. This is how I create my session.
sqlEngine = sqlalchemy.create_engine(self.getMySQLURI(), pool_recycle=10800, echo=False, echo_pool=False)
session = scoped_session(sessionmaker(autoflush=True,
autocommit=False,
bind=sqlEngine,
expire_on_commit=False))
These are my mysql configurations: interactive_timeout and wait_timeout is set to 28800 ~ 8 hours. net_write_timeout is set to 3600 ~ 60 mins and net_read_timeout is set 300 ~ 5 mins.
Any help is highly appreciated.
It is turned out to be problem with the tcp_connect_timeout between the application server and the database server. The tcp connect timeout was default of 1 hour and my pool recycle settings was 3 hrs. So anything between 1 and 3 were failing. Posting the answer to help others who might face this later.
Related
I am trying to write to an in-memory SQLite database in multiple threads. According to SQLAlchemy docs this is possible. However, in practice I cannot reliably get it to work. I have tried with both scoped_session and without, yielding the same results. Strangely enough, if I pass echo=True to create_engine the code works every time, maybe because it forces the engine to synchronously print all statements to the screen. Code sample and exceptions are below.
EDIT: The more I look into this, the more I realize that SQLite is just not very good at concurrency for write operations. The section on High Concurrency says that while an unlimited amount of readers are allowed, there can only be one writer at any given time. A better approach here would be to queue all write operations instead of trying to achieve any level of concurrency. However I am still open to suggestions if anyone has managed to find a solution.
import threading
from sqlalchemy import *
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy import create_engine
from sqlalchemy.pool import StaticPool
from sqlalchemy.orm import sessionmaker, scoped_session
in_memory_engine = create_engine('sqlite://', connect_args={'check_same_thread':False}, poolclass=StaticPool)
Base = declarative_base()
class Item(Base):
__tablename__ = 'items'
id = Column(Integer, primary_key=True, autoincrement=True)
data = Column(Integer)
Base.metadata.create_all(bind=in_memory_engine)
session_factory = sessionmaker(bind=in_memory_engine)
Session = scoped_session(session_factory)
def insert_items():
session = Session()
for i in range(1000):
session.add(Item(data=i))
session.commit()
Session.remove()
for i in range(10):
t = threading.Thread(target=insert_items)
t.start()
Exception in thread Thread-6:
Traceback (most recent call last):
File "c:\python\lib\site-packages\sqlalchemy\engine\base.py", line 1249, in _execute_context
cursor, statement, parameters, context
File "c:\python\lib\site-packages\sqlalchemy\engine\default.py", line 552, in do_execute
cursor.execute(statement, parameters)
sqlite3.OperationalError: cannot start a transaction within a transaction
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "c:\python\lib\threading.py", line 916, in _bootstrap_inner
self.run()
File "c:\python\lib\threading.py", line 864, in run
self._target(*self._args, **self._kwargs)
File "<ipython-input-1-e1040f59c94e>", line 26, in insert_items
session.commit()
File "c:\python\lib\site-packages\sqlalchemy\orm\session.py", line 1027, in commit
self.transaction.commit()
File "c:\python\lib\site-packages\sqlalchemy\orm\session.py", line 494, in commit
self._prepare_impl()
File "c:\python\lib\site-packages\sqlalchemy\orm\session.py", line 473, in _prepare_impl
self.session.flush()
File "c:\python\lib\site-packages\sqlalchemy\orm\session.py", line 2459, in flush
self._flush(objects)
File "c:\python\lib\site-packages\sqlalchemy\orm\session.py", line 2597, in _flush
transaction.rollback(_capture_exception=True)
File "c:\python\lib\site-packages\sqlalchemy\util\langhelpers.py", line 68, in __exit__
compat.reraise(exc_type, exc_value, exc_tb)
File "c:\python\lib\site-packages\sqlalchemy\util\compat.py", line 153, in reraise
raise value
File "c:\python\lib\site-packages\sqlalchemy\orm\session.py", line 2557, in _flush
flush_context.execute()
File "c:\python\lib\site-packages\sqlalchemy\orm\unitofwork.py", line 422, in execute
rec.execute(self)
File "c:\python\lib\site-packages\sqlalchemy\orm\unitofwork.py", line 589, in execute
uow,
File "c:\python\lib\site-packages\sqlalchemy\orm\persistence.py", line 245, in save_obj
insert,
File "c:\python\lib\site-packages\sqlalchemy\orm\persistence.py", line 1138, in _emit_insert_statements
statement, params
File "c:\python\lib\site-packages\sqlalchemy\engine\base.py", line 988, in execute
return meth(self, multiparams, params)
File "c:\python\lib\site-packages\sqlalchemy\sql\elements.py", line 287, in _execute_on_connection
return connection._execute_clauseelement(self, multiparams, params)
File "c:\python\lib\site-packages\sqlalchemy\engine\base.py", line 1107, in _execute_clauseelement
distilled_params,
File "c:\python\lib\site-packages\sqlalchemy\engine\base.py", line 1253, in _execute_context
e, statement, parameters, cursor, context
File "c:\python\lib\site-packages\sqlalchemy\engine\base.py", line 1473, in _handle_dbapi_exception
util.raise_from_cause(sqlalchemy_exception, exc_info)
File "c:\python\lib\site-packages\sqlalchemy\util\compat.py", line 398, in raise_from_cause
reraise(type(exception), exception, tb=exc_tb, cause=cause)
File "c:\python\lib\site-packages\sqlalchemy\util\compat.py", line 152, in reraise
raise value.with_traceback(tb)
File "c:\python\lib\site-packages\sqlalchemy\engine\base.py", line 1249, in _execute_context
cursor, statement, parameters, context
File "c:\python\lib\site-packages\sqlalchemy\engine\default.py", line 552, in do_execute
cursor.execute(statement, parameters)
sqlalchemy.exc.OperationalError: (sqlite3.OperationalError) cannot start a transaction within a transaction
[SQL: INSERT INTO items (data) VALUES (?)]
[parameters: (780,)]
(Background on this error at: http://sqlalche.me/e/e3q8)
Exception in thread Thread-7:
Traceback (most recent call last):
File "c:\python\lib\site-packages\sqlalchemy\engine\base.py", line 1249, in _execute_context
cursor, statement, parameters, context
File "c:\python\lib\site-packages\sqlalchemy\engine\default.py", line 552, in do_execute
cursor.execute(statement, parameters)
sqlite3.InterfaceError: Error binding parameter 0 - probably unsupported type.
I would like to serialize many Gensim library Word2Vec models in MySQL database. For the purpose of my project I am utilizing: Python, Flask, SQLAlchemy, and MySQL+PyMySQL. Below you can see my Word2VecModel class which I am using in order to create word2vec table in MySQL DB:
from db.db import db
import db_models.influencer
class Word2VecModel(db.Model):
__tablename__ = "word2vec"
m_id = db.Column(db.Integer, primary_key=True)
m_username = db.Column(db.String(20), db.ForeignKey("influencer.m_username"))
m_binary = db.Column(db.LargeBinary)
influencer = db.relationship("InfluencerModel")
def __init__(self, m_binary, m_username):
self.m_binary = m_binary
self.m_username = m_username
def __repr__(self):
return '<Word2Vec {}>'.format(self.m_name)
#classmethod
def find_by_username(cls, m_username):
return cls.query.filter_by(name=m_username).first()
def save_to_db(self):
db.session.add(self)
db.session.commit()
def delete_from_db(self):
db.session.delete(self)
db.session.commit()
Whenever I try to execute:
word2vec_model = Word2VecModel(pickle.dumps(word2vec), username)
word2vec_model .save_to_db()
I get the following error message:
Traceback (most recent call last):
File "/home/stefan/.virtualenvs/dl4cv/lib/python3.6/site-packages/pymysql/connections.py", line 705, in _write_bytes
self._sock.sendall(data)
BrokenPipeError: [Errno 32] Broken pipe
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/home/stefan/.virtualenvs/dl4cv/lib/python3.6/site-packages/sqlalchemy/engine/base.py", line 1278, in _execute_context
cursor, statement, parameters, context
File "/home/stefan/.virtualenvs/dl4cv/lib/python3.6/site-packages/sqlalchemy/engine/default.py", line 593, in do_execute
cursor.execute(statement, parameters)
File "/home/stefan/.virtualenvs/dl4cv/lib/python3.6/site-packages/pymysql/cursors.py", line 163, in execute
result = self._query(query)
File "/home/stefan/.virtualenvs/dl4cv/lib/python3.6/site-packages/pymysql/cursors.py", line 321, in _query
conn.query(q)
File "/home/stefan/.virtualenvs/dl4cv/lib/python3.6/site-packages/pymysql/connections.py", line 504, in query
self._execute_command(COMMAND.COM_QUERY, sql)
File "/home/stefan/.virtualenvs/dl4cv/lib/python3.6/site-packages/pymysql/connections.py", line 773, in _execute_command
self.write_packet(sql[:packet_size])
File "/home/stefan/.virtualenvs/dl4cv/lib/python3.6/site-packages/pymysql/connections.py", line 634, in write_packet
self._write_bytes(data)
File "/home/stefan/.virtualenvs/dl4cv/lib/python3.6/site-packages/pymysql/connections.py", line 710, in _write_bytes
"MySQL server has gone away (%r)" % (e,))
pymysql.err.OperationalError: (2006, "MySQL server has gone away (BrokenPipeError(32, 'Broken pipe'))")
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "app.py", line 117, in <module>
word2vec.save_to_db()
File "/home/stefan/PycharmProjects/NLP - Influencer Text Analysis/src/flask_api/db_models/word2vec.py", line 25, in save_to_db
db.session.commit()
File "/home/stefan/.virtualenvs/dl4cv/lib/python3.6/site-packages/sqlalchemy/orm/scoping.py", line 163, in do
return getattr(self.registry(), name)(*args, **kwargs)
File "/home/stefan/.virtualenvs/dl4cv/lib/python3.6/site-packages/sqlalchemy/orm/session.py", line 1042, in commit
self.transaction.commit()
File "/home/stefan/.virtualenvs/dl4cv/lib/python3.6/site-packages/sqlalchemy/orm/session.py", line 504, in commit
self._prepare_impl()
File "/home/stefan/.virtualenvs/dl4cv/lib/python3.6/site-packages/sqlalchemy/orm/session.py", line 483, in _prepare_impl
self.session.flush()
File "/home/stefan/.virtualenvs/dl4cv/lib/python3.6/site-packages/sqlalchemy/orm/session.py", line 2523, in flush
self._flush(objects)
File "/home/stefan/.virtualenvs/dl4cv/lib/python3.6/site-packages/sqlalchemy/orm/session.py", line 2664, in _flush
transaction.rollback(_capture_exception=True)
File "/home/stefan/.virtualenvs/dl4cv/lib/python3.6/site-packages/sqlalchemy/util/langhelpers.py", line 69, in __exit__
exc_value, with_traceback=exc_tb,
File "/home/stefan/.virtualenvs/dl4cv/lib/python3.6/site-packages/sqlalchemy/util/compat.py", line 178, in raise_
raise exception
File "/home/stefan/.virtualenvs/dl4cv/lib/python3.6/site-packages/sqlalchemy/orm/session.py", line 2624, in _flush
flush_context.execute()
File "/home/stefan/.virtualenvs/dl4cv/lib/python3.6/site-packages/sqlalchemy/orm/unitofwork.py", line 422, in execute
rec.execute(self)
File "/home/stefan/.virtualenvs/dl4cv/lib/python3.6/site-packages/sqlalchemy/orm/unitofwork.py", line 589, in execute
uow,
File "/home/stefan/.virtualenvs/dl4cv/lib/python3.6/site-packages/sqlalchemy/orm/persistence.py", line 245, in save_obj
insert,
File "/home/stefan/.virtualenvs/dl4cv/lib/python3.6/site-packages/sqlalchemy/orm/persistence.py", line 1136, in _emit_insert_statements
statement, params
File "/home/stefan/.virtualenvs/dl4cv/lib/python3.6/site-packages/sqlalchemy/engine/base.py", line 1014, in execute
return meth(self, multiparams, params)
File "/home/stefan/.virtualenvs/dl4cv/lib/python3.6/site-packages/sqlalchemy/sql/elements.py", line 298, in _execute_on_connection
return connection._execute_clauseelement(self, multiparams, params)
File "/home/stefan/.virtualenvs/dl4cv/lib/python3.6/site-packages/sqlalchemy/engine/base.py", line 1133, in _execute_clauseelement
distilled_params,
File "/home/stefan/.virtualenvs/dl4cv/lib/python3.6/site-packages/sqlalchemy/engine/base.py", line 1318, in _execute_context
e, statement, parameters, cursor, context
File "/home/stefan/.virtualenvs/dl4cv/lib/python3.6/site-packages/sqlalchemy/engine/base.py", line 1512, in _handle_dbapi_exception
sqlalchemy_exception, with_traceback=exc_info[2], from_=e
File "/home/stefan/.virtualenvs/dl4cv/lib/python3.6/site-packages/sqlalchemy/util/compat.py", line 178, in raise_
raise exception
File "/home/stefan/.virtualenvs/dl4cv/lib/python3.6/site-packages/sqlalchemy/engine/base.py", line 1278, in _execute_context
cursor, statement, parameters, context
File "/home/stefan/.virtualenvs/dl4cv/lib/python3.6/site-packages/sqlalchemy/engine/default.py", line 593, in do_execute
cursor.execute(statement, parameters)
File "/home/stefan/.virtualenvs/dl4cv/lib/python3.6/site-packages/pymysql/cursors.py", line 163, in execute
result = self._query(query)
File "/home/stefan/.virtualenvs/dl4cv/lib/python3.6/site-packages/pymysql/cursors.py", line 321, in _query
conn.query(q)
File "/home/stefan/.virtualenvs/dl4cv/lib/python3.6/site-packages/pymysql/connections.py", line 504, in query
self._execute_command(COMMAND.COM_QUERY, sql)
File "/home/stefan/.virtualenvs/dl4cv/lib/python3.6/site-packages/pymysql/connections.py", line 773, in _execute_command
self.write_packet(sql[:packet_size])
File "/home/stefan/.virtualenvs/dl4cv/lib/python3.6/site-packages/pymysql/connections.py", line 634, in write_packet
self._write_bytes(data)
File "/home/stefan/.virtualenvs/dl4cv/lib/python3.6/site-packages/pymysql/connections.py", line 710, in _write_bytes
"MySQL server has gone away (%r)" % (e,))
Killed
I've read somewhere that increasing MySQL connection timeout might help, but not in my case. Here is my DB engine configuration:
app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
app.config['SQLALCHEMY_DATABASE_URI'] = 'mysql+pymysql://root:''#localhost/********'
app.config['PROPAGATE_EXCEPTIONS'] = True
app.config["SQLALCHEMY_ENGINE_OPTIONS"] = {"pool_recycle": 120}
I have some code which tries to connect to a mySQL database and retrieve a query.
The connection code is in a module called connection and looks like:
#!/usr/bin/env python3
import pandas as pd
import pymysql
from sqlalchemy import create_engine
COMPANY_SERVER = create_engine(
'mysql+pymysql://view_user:connectiondetails')
def read_sql(query):
return pd.read_sql_query(query, COMPANY_SERVER)
I have omitted the connection details for security. But this connection has worked in the past.
I am trying to connect and query a database table (which is pulled in with variable name table) and trying returning a DESCRIBE of the table in the following way:
#!/usr/bin/env python3
import datetime as dt
import numpy as np
import pandas as pd
from copy import copy
import pymysql
from sql.connection import read_sql
class DBSnapData(object):
def __init__(self,
start_dt,
end_dt,
start_point,
end_point,
variables,
table,
stock_id
):
self.start_dt = start_dt
self.end_dt = end_dt
self.start_point = start_point
self.end_point = end_point
self.variables = variables
self.table = table
self.stock_id = stock_id
self.schema = self.load_schema()
def load_schema(self):
return run_schema_sql_query(self.table)
def run_schema_sql_query(table):
return read_sql('DESCRIBE %s' % table)
I am getting the following error output:
2018-01-17 22:34:02,717 (pymysql.err.OperationalError) (1142, "SELECT command denied to user 'view_user'#'192.168.9.132' for table 'TBL_MKTDATA_SNAPS_AUS'") [SQL: 'DESCRIBE TBL_MKTDATA_SNAPS_AUS']
Traceback (most recent call last):
File "/usr/local/lib64/python3.5/site-packages/sqlalchemy/engine/base.py", line 1182, in _execute_context
context)
File "/usr/local/lib64/python3.5/site-packages/sqlalchemy/engine/default.py", line 470, in do_execute
cursor.execute(statement, parameters)
File "/usr/local/lib/python3.5/site-packages/pymysql/cursors.py", line 166, in execute
result = self._query(query)
File "/usr/local/lib/python3.5/site-packages/pymysql/cursors.py", line 322, in _query
conn.query(q)
File "/usr/local/lib/python3.5/site-packages/pymysql/connections.py", line 856, in query
self._affected_rows = self._read_query_result(unbuffered=unbuffered)
File "/usr/local/lib/python3.5/site-packages/pymysql/connections.py", line 1057, in _read_query_result
result.read()
File "/usr/local/lib/python3.5/site-packages/pymysql/connections.py", line 1340, in read
first_packet = self.connection._read_packet()
File "/usr/local/lib/python3.5/site-packages/pymysql/connections.py", line 1014, in _read_packet
packet.check_error()
File "/usr/local/lib/python3.5/site-packages/pymysql/connections.py", line 393, in check_error
err.raise_mysql_exception(self._data)
File "/usr/local/lib/python3.5/site-packages/pymysql/err.py", line 107, in raise_mysql_exception
raise errorclass(errno, errval)
pymysql.err.OperationalError: (1142, "SELECT command denied to user 'view_user'#'192.168.9.132' for table 'TBL_MKTDATA_SNAPS_AUS'")
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "/home/scoleman/bin/export_mkt_data", line 405, in main
extract_by_id(sc_id, bbg_ticker, bb_id, lot_size_changes)
File "/home/scoleman/bin/export_mkt_data", line 346, in extract_by_id
stock_id)
File "/home/scoleman/git/sql_data/sx_data_adhoc.py", line 100, in __init__
self.schema = self.load_schema()
File "/home/scoleman/git/sql_data/sx_data_adhoc.py", line 106, in load_schema
return run_schema_sql_query(self.table)
File "/home/scoleman/git/sql_data/sx_data_adhoc.py", line 19, in run_schema_sql_query
return read_sql('DESCRIBE %s' % table)
File "/home/scoleman/git/sql_data/sql/connection.py", line 17, in read_sql
return pd.read_sql_query(query, COMPANY_SERVER)
File "/usr/local/lib64/python3.5/site-packages/pandas/io/sql.py", line 331, in read_sql_query
parse_dates=parse_dates, chunksize=chunksize)
File "/usr/local/lib64/python3.5/site-packages/pandas/io/sql.py", line 1084, in read_query
result = self.execute(*args)
File "/usr/local/lib64/python3.5/site-packages/pandas/io/sql.py", line 975, in execute
return self.connectable.execute(*args, **kwargs)
File "/usr/local/lib64/python3.5/site-packages/sqlalchemy/engine/base.py", line 2064, in execute
return connection.execute(statement, *multiparams, **params)
File "/usr/local/lib64/python3.5/site-packages/sqlalchemy/engine/base.py", line 939, in execute
return self._execute_text(object, multiparams, params)
File "/usr/local/lib64/python3.5/site-packages/sqlalchemy/engine/base.py", line 1097, in _execute_text
statement, parameters
File "/usr/local/lib64/python3.5/site-packages/sqlalchemy/engine/base.py", line 1189, in _execute_context
context)
File "/usr/local/lib64/python3.5/site-packages/sqlalchemy/engine/base.py", line 1402, in _handle_dbapi_exception
exc_info
File "/usr/local/lib64/python3.5/site-packages/sqlalchemy/util/compat.py", line 203, in raise_from_cause
reraise(type(exception), exception, tb=exc_tb, cause=cause)
File "/usr/local/lib64/python3.5/site-packages/sqlalchemy/util/compat.py", line 186, in reraise
raise value.with_traceback(tb)
File "/usr/local/lib64/python3.5/site-packages/sqlalchemy/engine/base.py", line 1182, in _execute_context
context)
File "/usr/local/lib64/python3.5/site-packages/sqlalchemy/engine/default.py", line 470, in do_execute
cursor.execute(statement, parameters)
File "/usr/local/lib/python3.5/site-packages/pymysql/cursors.py", line 166, in execute
result = self._query(query)
File "/usr/local/lib/python3.5/site-packages/pymysql/cursors.py", line 322, in _query
conn.query(q)
File "/usr/local/lib/python3.5/site-packages/pymysql/connections.py", line 856, in query
self._affected_rows = self._read_query_result(unbuffered=unbuffered)
File "/usr/local/lib/python3.5/site-packages/pymysql/connections.py", line 1057, in _read_query_result
result.read()
File "/usr/local/lib/python3.5/site-packages/pymysql/connections.py", line 1340, in read
first_packet = self.connection._read_packet()
File "/usr/local/lib/python3.5/site-packages/pymysql/connections.py", line 1014, in _read_packet
packet.check_error()
File "/usr/local/lib/python3.5/site-packages/pymysql/connections.py", line 393, in check_error
err.raise_mysql_exception(self._data)
File "/usr/local/lib/python3.5/sit
If anyone could give me a pointer as to a solution it would be much appreciated. I think the problem might be with pymysql in the connection but really am unsure.
Thanks
Your error says view_user doesn't have permission to query data on 192.168.9.132 this server.
You will have to do
GRANT SELECT ON *.* TO 'view_user'#'host_or_wildcard' IDENTIFIED BY 'password'; to allow your user to query on specified server.
Or
GRANT ALL PRIVILEGES ON *.* TO 'view_user'#'192.168.9.132'; to grant all priviliges.
P.S. To do above you will have to be root user. Use mysql -u root -p command to connect to mysql server.
The issue I am having is with the mixing of sqlalchemy sessions with flask-sqlalchemy session. So for context, I am running a flask-restful app on the background and I have a file (runnable.py) with a main method which is supposed to run periodically for an average period of 4 weeks.
This file uses its own session (pure sqlalchemy session) and connects to this app (which uses flask-sqlalchemy session).
After a few hours (sometimes 1 day), I get this error
Traceback (most recent call last):
File "/home/ubuntu/cron/runnable.py", line 781, in <module>
main()
File "/home/ubuntu/cron/runnable.py", line 677, in main
db_process_attendee(attendee, eid, event_id)
File "/home/ubuntu/cron/runnable.py", line 78, in db_process_attendee
update_attendee_information(attendee, attributes, eid, event_id)
File "/home/ubuntu/cron/runnable.py", line 117, in update_attendee_information
update_attendee_profile(attendee, id_attendee_login, eid, event_id)
File "/home/ubuntu/cron/runnable.py", line 291, in update_attendee_profile
generate_company_tags_lower.generate_company_tags(id_attendee_login)
File "/home/ubuntu/cron/app/util/generate_company_tags_lower.py", line 28, in generate_company_tags
filter(a_p.id_attendee_login == id_attendee_login).\
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/orm/query.py", line 2426, in scalar
ret = self.one()
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/orm/query.py", line 2395, in one
ret = list(self)
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/orm/query.py", line 2438, in __iter__
return self._execute_and_instances(context)
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/orm/query.py", line 2453, in _execute_and_instances
result = conn.execute(querycontext.statement, self._params)
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 729, in execute
return meth(self, multiparams, params)
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/sql/elements.py", line 322, in _execute_on_connection
return connection._execute_clauseelement(self, multiparams, params)
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 826, in _execute_clauseelement
compiled_sql, distilled_params
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 958, in _execute_context
context)
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 1159, in _handle_dbapi_exception
exc_info
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/util/compat.py", line 199, in raise_from_cause
reraise(type(exception), exception, tb=exc_tb)
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 951, in _execute_context
context)
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/default.py", line 436, in do_execute
cursor.execute(statement, parameters)
File "/usr/local/lib/python2.7/dist-packages/pymysql/cursors.py", line 134, in execute
result = self._query(query)
File "/usr/local/lib/python2.7/dist-packages/pymysql/cursors.py", line 282, in _query
conn.query(q)
File "/usr/local/lib/python2.7/dist-packages/pymysql/connections.py", line 767, in query
self._execute_command(COMMAND.COM_QUERY, sql)
File "/usr/local/lib/python2.7/dist-packages/pymysql/connections.py", line 957, in _execute_command
self._write_bytes(prelude + sql[:chunk_size-1])
File "/usr/local/lib/python2.7/dist-packages/pymysql/connections.py", line 916, in _write_bytes
raise err.OperationalError(2006, "MySQL server has gone away (%r)" % (e,))
sqlalchemy.exc.OperationalError: (OperationalError) (2006, "MySQL server has gone away (error(110, 'Connection timed out'))") 'SELECT a_p.id_attendee_profile AS a_p_id_attendee_profile, a_p.id_attendee_login AS a_p_id_attendee_login \nFROM a_p \nWHERE a_p.id_attendee_login = %s' (128368,)
I tried the following suggestions but they did not work:
• In my app config, adding "pymysql" to the SQLALCHEMY_DATABASE_URI
• Doing a db.session.commit() when I enter generate_company_tags(id_attendee_login) before writing a sql select query. I thought it would flush the session.
Btw, the sqlalchemy pool recycle value is set to less than the max in AWS RDS.
Any suggestions on how I can go solving this?
When i run the dbManager.create_all() command, it runs with out errors but fails to create the tables. When i delete the database and run the create_all() command, i get the no such database as ##### error which i should get but when the database does exist, nothing happens.
Please can anyone see what i'm doing wrong?
from blogconfig import dbManager
class Art(dbManager.Model):
id = dbManager.Column(dbManager.Integer, primary_key = True)
title = dbManager.Column(dbManager.String(64), index = True, unique = True)
content = dbManager.Column(dbManager.Text(5000))
def __repr__(self):
return '<Art %r>' %(self.title)
EDIT
This is the shell command
from blogconfig import dbManager
>>> dbManager.create_all()
import models
>>> a = models.Art(title='des', content='asdfvhbdjbjdn')
>>> dbManager.session.add(a)
>>> dbManager.session.commit()
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/orm/scoping.py", line 149, in do
return getattr(self.registry(), name)(*args, **kwargs)
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/orm/session.py", line 721, in commit
self.transaction.commit()
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/orm/session.py", line 354, in commit
self._prepare_impl()
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/orm/session.py", line 334, in _prepare_impl
self.session.flush()
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/orm/session.py", line 1818, in flush
self._flush(objects)
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/orm/session.py", line 1936, in _flush
transaction.rollback(_capture_exception=True)
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/util/langhelpers.py", line 58, in __exit__
compat.reraise(exc_type, exc_value, exc_tb)
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/orm/session.py", line 1900, in _flush
flush_context.execute()
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/orm/unitofwork.py", line 372, in execute
rec.execute(self)
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/orm/unitofwork.py", line 525, in execute
uow
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/orm/persistence.py", line 64, in save_obj
table, insert)
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/orm/persistence.py", line 569, in _emit_insert_statements
execute(statement, params)
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 662, in execute
params)
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 761, in _execute_clauseelement
compiled_sql, distilled_params
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 874, in _execute_context
context)
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 1024, in _handle_dbapi_exception
exc_info
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/util/compat.py", line 195, in raise_from_cause
reraise(type(exception), exception, tb=exc_tb)
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 867, in _execute_context
context)
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/default.py", line 324, in do_execute
cursor.execute(statement, parameters)
File "/usr/lib/python2.7/dist-packages/MySQLdb/cursors.py", line 174, in execute
self.errorhandler(self, exc, value)
File "/usr/lib/python2.7/dist-packages/MySQLdb/connections.py", line 36, in defaulterrorhandler
raise errorclass, errorvalue
sqlalchemy.exc.ProgrammingError: (ProgrammingError) (1146, "Table 'blog.art' doesn't exist") 'INSERT INTO art (title, content) VALUES (%s, %s)' ('des', 'asdfvhbdjbjdn')
dbManager will not know about the models you define in other modules unless they are imported before running create_all.
In a real application this shouldn't matter because running the flask app should set up the db and import views/blueprints to register them. Since the views use the models, the models are indirectly imported and are available to the dbManager.
Either import your models in the blogconfig module after creating the dbManager instance, or change the order of you shell commands to be
>>> from blogconfig import dbManager
>>> import models
>>> dbManager.create_all()
SQLAlchemy will only create tables, the database must already exist, which is why you're seeing the other error when you delete the database.