helo,
I don't understand why my sqlite database is locked on a drop ( the code
is following)
thanks for your explanation.
007-09-14 18:26:36,375 INFO
sqlalchemy.engine.threadlocal.TLEngine.0x..f0 ROLLBACK
Traceback (most recent call last):
File
"C:\Python25\Lib\site-packages\pythonwin\pywin\framework\scriptutils.py",
line 310, in RunScript
exec codeObject in __main__.__dict__
File "C:\Documents and Settings\pouchou.RECT\Mes documents\exemple
formation python\sqlalchemy\simple-alchemy.py", line 107, in <module>
engine.drop(os_table)
File "build\bdist.win32\egg\sqlalchemy\engine\base.py", line 1044, in drop
self._run_visitor(self.dialect.schemadropper, entity,
connection=connection, **kwargs)
File "build\bdist.win32\egg\sqlalchemy\engine\base.py", line 1069, in
_run_visitor
visitorcallable(self.dialect, conn, **kwargs).traverse(element)
File "build\bdist.win32\egg\sqlalchemy\sql\visitors.py", line 63, in
traverse
meth(target)
File "build\bdist.win32\egg\sqlalchemy\sql\compiler.py", line 922, in
visit_table
self.execute()
File "build\bdist.win32\egg\sqlalchemy\engine\base.py", line 1624, in
execute
return self.connection.execute(self.buffer.getvalue())
File "build\bdist.win32\egg\sqlalchemy\engine\base.py", line 789, in
execute
return Connection.executors[c](self, object, multiparams, params)
File "build\bdist.win32\egg\sqlalchemy\engine\base.py", line 799, in
_execute_text
self.__execute_raw(context)
File "build\bdist.win32\egg\sqlalchemy\engine\base.py", line 850, in
__execute_raw
self._cursor_execute(context.cursor, context.statement, parameters,
context=context)
File "build\bdist.win32\egg\sqlalchemy\engine\base.py", line 867, in
_cursor_execute
raise exceptions.DBAPIError.instance(statement, parameters, e)
*OperationalError: (OperationalError) database table is locked '\nDROP
TABLE os' ()*
# -*- coding: CP1252 -*-
from pprint import pprint
from sqlalchemy import create_engine, Table, Column, MetaData, Integer,
Date, Unicode, Float, ForeignKey
from sqlalchemy.sql import select, and_
# Connexion à la base
engine = create_engine('sqlite://',echo=True)
# echo=True On voit les ordres sql générés pas SQLalchemy
# une metadata représente un ensemble de tables
# on rattache ensuite les tables à une metadata
metadata = MetaData()
computers_table = Table('computers',metadata,
Column('computer_id',Integer, primary_key=True),
Column('date_achat',Date) ,
Column('marque',Unicode(20)),
Column('qte',Float),
Column('prix',Float),)
os_table = Table('os',metadata,
Column('os_id',Integer, primary_key=True),
Column('computer_id', None, ForeignKey(
'computers.computer_id')),
Column('os',Unicode(20)),)
# création des tables
metadata.create_all(engine)
# liste de dictionnaire pour mise à jour
liste_computers = [{'date_achat':'2007-03-05',
'marque':'M4',
'qte':1000,
'prix':35.14},
{'date_achat':'2007-04-05',
'marque':'M3',
'qte':10000,
'prix':40.143},
{'date_achat':'2007-03-05',
'marque':'M2',
'qte':20000,
'prix':40.14},
{'date_achat':'2007-03-05',
'marque':'M1',
'qte':10000,
'prix':35.1}]
liste_os = [ {'computer_id':'1','nom_os':'Linux'},
{'computer_id':'2','nom_os':'Linux'},
{'computer_id':'3','nom_os':'windows'}]
# création d'une connexion à la base
conn = engine.connect()
# insertion
conn.execute(computers_table.insert(),liste_computers)
conn.execute(os_table.insert(),liste_os)
# Explicit, connection
result_os=conn.execute(os_table.select())
pprint(result_os.fetchall())
# Explicit, connectionless
result_os = engine.execute(os_table.select())
pprint(result_os.fetchall())
# Implicite Connectionless
metadata.bind = engine
result_os=os_table.select().execute()
pprint(result_os.fetchall())
ordinateurs = computers_table.select(computers_table.c.prix <
100.0).execute()
ordinateur_pas_cher = ordinateurs.fetchone()
print ("marque d'un ordi pas cher: %s ") % ordinateur_pas_cher.marque
ordinateurs = computers_table.select(and_((computers_table.c.prix >
1000.0),(computers_table.c.prix > 1000.0))).execute()
ordinateur_medium_price = ordinateurs.fetchone()
print ("marque d'un ordi medium price: %s ") % ordinateur_pas_cher.marque
ordinateurs =
select([computers_table.c.marque,computers_table.c.prix]).execute()
for ordi in ordinateurs:
print "marque:%s prix:%s" % (ordi[0],ordi[1])
result_os.close()
ordinateurs.close()
metadata.bind = None
conn.close()
# nettoyage drop des tables
engine.drop(os_table)
#engine.drop(computers_table)
#os_table.drop(bind=conn)
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