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| jakke | ok guys, still messing with the transaction machinery in zope, trying to put the puzzle together | 12:28 |
|---|---|---|
| jakke | I can now open a Data.fs at a given tid with open(at=tid) | 12:29 |
| jakke | but how on earth do I access that transaction? cause when I do transaction.get, I start a new one | 12:30 |
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| MatthewWilkes | jakke: What are you trying to do with the transaction? | 12:48 |
| jakke | I want to access the objects that are stored in that specific transaction | 12:49 |
| jakke | I know how to do that | 12:49 |
| jakke | background: we had corrupted data recently, digging my way into the ZODB/transactions machinery and document it | 12:49 |
| jakke | since there is no "querry" language in ZODB | 12:50 |
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| jakke | J1m, remember you pointed me some time ago to the connection.open( before=tid) functionality? | 17:05 |
| J1m | yes | 17:05 |
| jakke | I can see the open connection in the ConnectionDebugInfo | 17:05 |
| jakke | but I can't see how to use that connection and join that transaction | 17:06 |
| jakke | have you ever used that? | 17:06 |
| jakke | the next steps I know how to do, I think, for what I need | 17:06 |
| J1m | Have I ever used what? | 17:06 |
| jakke | the open(before) stuff | 17:06 |
| J1m | yes | 17:06 |
| jakke | or access an existing transaction from a given connection | 17:07 |
| jakke | I don't see the glue between the open connection and accessing the transaction :s | 17:07 |
| J1m | I've accessed a connection's transaction manager. | 17:07 |
| jakke | right, been there | 17:08 |
| jakke | and then join that transaction manager on a historical_pool connection? | 17:08 |
| J1m | um, I have nfc what you're getting at. | 17:08 |
| J1m | I've used the before option to inspect old data. | 17:09 |
| J1m | You can' | 17:09 |
| J1m | You can't modify data through such a connection. | 17:09 |
| jakke | don't have to, just need to see it | 17:09 |
| jakke | but I need to see the contents of a specific transaction | 17:10 |
| jakke | so I open a connection, with that specific tid: open(at=tid) | 17:10 |
| J1m | You can only see the database as of a particular point in time, such as just after a transaction was commited. | 17:11 |
| jakke | but if I iterate over the transactions, I can get the TransactionRecord, which is pretty useless if I have to loop over all of them | 17:12 |
| J1m | You probably have to use a tid 1 higher than the tid of the transaction you're interested in, cuz "before". | 17:12 |
| jakke | so far so good, I'm following you there | 17:12 |
| jakke | but how do I get to the TransactionRecord then, and to the next one? | 17:12 |
| jakke | iterator starts from the first one | 17:12 |
| jakke | first in Data.fs I mean | 17:13 |
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| jakke | J1m, iterating over the connection._storage to find the right transaction proves to be easier, using that bit now | 17:53 |
| jakke | closing in to a summary of my search, thx for your pointers! | 17:54 |
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