[Zope-DB] Re: Zope database connectivity
Hi, Maciej Wisniowski napisał(a): If one is careful, one can find a reliable solution... Hopefully I think I did this today... I've found that psycopg pool implementation has nice class: class PersistentConnectionPool(AbstractConnectionPool): A pool that assigns persistent connections to different threads. Note that this connection pool generates by itself the required keys using the current thread id. This means that untill a thread put away a connection it will always get the same connection object by successive .getconn() calls. This also means that a thread can't use more than one single connection from the pool. I used this, and finally I have DCOracle2 with connection pool, without volatile attributes (I didn't changed implementation of stored procedures yet), with ability to reconnect after things like DB restart and with REAL ability to open/close connections from ZMI. Did anyone try SQL Relay as a bridge? They say When using SQL Relay, the database can be bounced without having to restart Zope Pawel Lewicki ___ Zope-DB mailing list Zope-DB@zope.org http://mail.zope.org/mailman/listinfo/zope-db
[Zope-DB] Re: Zope database connectivity
I used this, and finally I have DCOracle2 with connection pool, without volatile attributes (I didn't changed implementation of stored procedures yet), with ability to reconnect after things like DB restart and with REAL ability to open/close connections from ZMI. Did anyone try SQL Relay as a bridge? They say When using SQL Relay, the database can be bounced without having to restart Zope I tried this. It works, but possible problem with volatile attributes persists - it is specific to Zope Database Adapters, and SQLRelay adapter uses '_v_' attributes too. Issue with 'reconnect' behaviour of SQLRelay may be that your Zope instance will appear 'hanged' when database is not running (or something like that) because Zope threads will be waiting for DB response. AFAIR there is no timeout for SQLRelay (sometimes it is good, sometimes not). Another question is what happens with transactions integrity in this situation. -- Maciej Wisniowski ___ Zope-DB mailing list Zope-DB@zope.org http://mail.zope.org/mailman/listinfo/zope-db
