Re: [Zope-DB] Managing Connections with SQL Methods
Why don't you just use ZSQL Methods?! Chris Seth Gottlieb wrote: The problem seemed to be that Zope.app() was returning a new root object instance every time a new DAO (data access object) was initialized. After 3, boom. The work around is to pass the context of the calling object with syntax like __of__(self) when you call methods of the DAO. You can also pass in a reference to the calling object in the method call dao = getDAO(self,). Then the method on the DAO you can use setattr(self, CONNECTION_NAME, getattr(context,CONNECTION_NAME)) Where CONNECTION_NAME is a string with the same name as the Z SQL Connection object that the calling object acquired. Seth Gottlieb wrote: Thanks Michele, I was thinking of doing that as well. Did you point the DA to SQLRelay? Or did you have your Python code connect directly to SQLRelay? My application needs to be able to roll back transactions when told to by the transaction manager. Do you know if going around Zope's DB Connectivity would cause a problem? --Seth Michele Marcionelli ([EMAIL PROTECTED]) wrote: -BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Hello Seth, I ran exactly in the same problem and I installed SQL Relay (http://sqlrelay.sourceforge.net/) that manage better (i.e. good) the connections than ZMySQLDA. If someone has a solution to the problem... ;-)) Regards, Michele On 25.10.2005, at 23:12, Seth Gottlieb wrote: Hi, I have a Python class that my Zope application uses to talk to a relational database (MySQL for now). I am using a Z SQL Connection (ZMySQLDA) object to handle DB connectivity. When I initialize, I get a handle of the connection object like this: import Zope setattr(self, CONNECTION_NAME, getattr(Zope.app(),CONNECTION_NAME)) Where CONNECTION_NAME is a string that matches the ID of the connection object that I have in the Root folder of Zope. Then I run queries like this: from Products.ZSQLMethods.SQL import SQL setattr(self, '_selectProperties', SQL('_selectProperties', '', CONNECTION_NAME, 'schemaId', 'SELECT * FROM ' + TABLE_NAME[self._context.id] + ' WHERE SCHEMA_ID = ')) The life of this class should be Zope transaction (I am hooking into Shared.DC.ZRDB.TM.TM to manage these objects). The problem I am running into is I seem to be running out of connections. Everytime I inititialize and run "show processlist;" within MySQL, the number of connections increases. I get to a maximum of 3 and then my Zope instance hangs. Is there any reason why these DB connections do not get reused or destroyed after queries are made? Any ideas? Thanks, Seth - -- [EMAIL PROTECTED] / phone: +41 44 632 6193 eth zentrum / hg g 14 / raemistrasse 101 - ch-8092 zurich -BEGIN PGP SIGNATURE- Version: GnuPG v1.2.4 (Darwin) iD8DBQFDXqPbqnOUmIjQmOYRAnAjAJ4stbSaa4Psqb+V2jblDiJQc6MMFQCgwt3n wiIJXXEf4+H+021jDqzPSY8= =SYIz -END PGP SIGNATURE- ___ Zope-DB mailing list Zope-DB@zope.org http://mail.zope.org/mailman/listinfo/zope-db -- Simplistix - Content Management, Zope & Python Consulting - http://www.simplistix.co.uk ___ Zope-DB mailing list Zope-DB@zope.org http://mail.zope.org/mailman/listinfo/zope-db
Re: [Zope-DB] Managing Connections with SQL Methods
The problem seemed to be that Zope.app() was returning a new root object instance every time a new DAO (data access object) was initialized. After 3, boom. The work around is to pass the context of the calling object with syntax like __of__(self) when you call methods of the DAO. You can also pass in a reference to the calling object in the method call dao = getDAO(self,). Then the method on the DAO you can use setattr(self, CONNECTION_NAME, getattr(context,CONNECTION_NAME)) Where CONNECTION_NAME is a string with the same name as the Z SQL Connection object that the calling object acquired. Seth Gottlieb wrote: Thanks Michele, I was thinking of doing that as well. Did you point the DA to SQLRelay? Or did you have your Python code connect directly to SQLRelay? My application needs to be able to roll back transactions when told to by the transaction manager. Do you know if going around Zope's DB Connectivity would cause a problem? --Seth Michele Marcionelli ([EMAIL PROTECTED]) wrote: -BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Hello Seth, I ran exactly in the same problem and I installed SQL Relay (http://sqlrelay.sourceforge.net/) that manage better (i.e. good) the connections than ZMySQLDA. If someone has a solution to the problem... ;-)) Regards, Michele On 25.10.2005, at 23:12, Seth Gottlieb wrote: Hi, I have a Python class that my Zope application uses to talk to a relational database (MySQL for now). I am using a Z SQL Connection (ZMySQLDA) object to handle DB connectivity. When I initialize, I get a handle of the connection object like this: import Zope setattr(self, CONNECTION_NAME, getattr(Zope.app(),CONNECTION_NAME)) Where CONNECTION_NAME is a string that matches the ID of the connection object that I have in the Root folder of Zope. Then I run queries like this: from Products.ZSQLMethods.SQL import SQL setattr(self, '_selectProperties', SQL('_selectProperties', '', CONNECTION_NAME, 'schemaId', 'SELECT * FROM ' + TABLE_NAME[self._context.id] + ' WHERE SCHEMA_ID = ')) The life of this class should be Zope transaction (I am hooking into Shared.DC.ZRDB.TM.TM to manage these objects). The problem I am running into is I seem to be running out of connections. Everytime I inititialize and run "show processlist;" within MySQL, the number of connections increases. I get to a maximum of 3 and then my Zope instance hangs. Is there any reason why these DB connections do not get reused or destroyed after queries are made? Any ideas? Thanks, Seth - -- [EMAIL PROTECTED] / phone: +41 44 632 6193 eth zentrum / hg g 14 / raemistrasse 101 - ch-8092 zurich -BEGIN PGP SIGNATURE- Version: GnuPG v1.2.4 (Darwin) iD8DBQFDXqPbqnOUmIjQmOYRAnAjAJ4stbSaa4Psqb+V2jblDiJQc6MMFQCgwt3n wiIJXXEf4+H+021jDqzPSY8= =SYIz -END PGP SIGNATURE- ___ Zope-DB mailing list Zope-DB@zope.org http://mail.zope.org/mailman/listinfo/zope-db -- Seth Gottlieb Optaros, Inc. 60 Canal Street Boston, MA 02114 e: [EMAIL PROTECTED] v: 617.227.1855 ext. 107 f: 617.227.1755 m: 617.852.2956 ___ Zope-DB mailing list Zope-DB@zope.org http://mail.zope.org/mailman/listinfo/zope-db
Re: [Zope-DB] Managing Connections with SQL Methods
Thanks Michele, I was thinking of doing that as well. Did you point the DA to SQLRelay? Or did you have your Python code connect directly to SQLRelay? My application needs to be able to roll back transactions when told to by the transaction manager. Do you know if going around Zope's DB Connectivity would cause a problem? --Seth Michele Marcionelli ([EMAIL PROTECTED]) wrote: > > -BEGIN PGP SIGNED MESSAGE- > Hash: SHA1 > > Hello Seth, > > I ran exactly in the same problem and I installed SQL Relay > (http://sqlrelay.sourceforge.net/) that manage better (i.e. good) the > connections than ZMySQLDA. If someone has a solution to the problem... > ;-)) > > Regards, > Michele > > On 25.10.2005, at 23:12, Seth Gottlieb wrote: > > > Hi, > > > > I have a Python class that my Zope application uses to talk to a > > relational database (MySQL for now). I am using a Z SQL Connection > > (ZMySQLDA) object to handle DB connectivity. When I initialize, I get > > a handle of the connection object like this: > > > > import Zope > > setattr(self, CONNECTION_NAME, getattr(Zope.app(),CONNECTION_NAME)) > > > > Where CONNECTION_NAME is a string that matches the ID of the > > connection object that I have in the Root folder of Zope. > > > > Then I run queries like this: > > > > from Products.ZSQLMethods.SQL import SQL > > > > setattr(self, '_selectProperties', > > SQL('_selectProperties', '', CONNECTION_NAME, 'schemaId', > > 'SELECT * FROM ' + TABLE_NAME[self._context.id] + ' WHERE > > SCHEMA_ID = ')) > > > > The life of this class should be Zope transaction (I am hooking into > > Shared.DC.ZRDB.TM.TM to manage these objects). > > > > The problem I am running into is I seem to be running out of > > connections. Everytime I inititialize and run "show processlist;" > > within MySQL, the number of connections increases. I get to a maximum > > of 3 and then my Zope instance hangs. > > > > Is there any reason why these DB connections do not get reused or > > destroyed after queries are made? > > > > Any ideas? > > > > Thanks, > > > > Seth > - -- > [EMAIL PROTECTED] / phone: +41 44 632 6193 > eth zentrum / hg g 14 / raemistrasse 101 - ch-8092 zurich > > -BEGIN PGP SIGNATURE- > Version: GnuPG v1.2.4 (Darwin) > > iD8DBQFDXqPbqnOUmIjQmOYRAnAjAJ4stbSaa4Psqb+V2jblDiJQc6MMFQCgwt3n > wiIJXXEf4+H+021jDqzPSY8= > =SYIz > -END PGP SIGNATURE- > > ___ Zope-DB mailing list Zope-DB@zope.org http://mail.zope.org/mailman/listinfo/zope-db
[Zope-DB] Managing Connections with SQL Methods
Hi, I have a Python class that my Zope application uses to talk to a relational database (MySQL for now). I am using a Z SQL Connection (ZMySQLDA) object to handle DB connectivity. When I initialize, I get a handle of the connection object like this: import Zope setattr(self, CONNECTION_NAME, getattr(Zope.app(),CONNECTION_NAME)) Where CONNECTION_NAME is a string that matches the ID of the connection object that I have in the Root folder of Zope. Then I run queries like this: from Products.ZSQLMethods.SQL import SQL setattr(self, '_selectProperties', SQL('_selectProperties', '', CONNECTION_NAME, 'schemaId', 'SELECT * FROM ' + TABLE_NAME[self._context.id] + ' WHERE SCHEMA_ID = ')) The life of this class should be Zope transaction (I am hooking into Shared.DC.ZRDB.TM.TM to manage these objects). The problem I am running into is I seem to be running out of connections. Everytime I inititialize and run "show processlist;" within MySQL, the number of connections increases. I get to a maximum of 3 and then my Zope instance hangs. Is there any reason why these DB connections do not get reused or destroyed after queries are made? Any ideas? Thanks, Seth -- Seth Gottlieb Optaros, Inc. 60 Canal Street Boston, MA 02114 e: [EMAIL PROTECTED] v: 617.227.1855 ext. 107 f: 617.227.1755 m: 617.852.2956 ___ Zope-DB mailing list Zope-DB@zope.org http://mail.zope.org/mailman/listinfo/zope-db