Fix a bunch of SQLite-related bugs #2866
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…ly threw. `Query`'s destructor didn't run in this case, so the statement was never reset, and trying to use it again would fail with SQLITE_MISUSE.
We are doing other per-statement cleanup in `destroy()`, makes sense to reset row counters here too, rather than on the next query constructor.
This commit has no functional change, but changes prepareSql() to return a struct containing the statement and other information which must be kept with the statement. At present there is no other information, but the next commit will add a description of the statement's effects on the transaction stack. I split this into a separate commit because it's a noisy mechanical change, which I wanted to keep separate from the actual logic change.
This registers a callback which will be called if the current transaction scope ends up being rolled back. We'll need this to fix bugs elsewhere. The implementation requires that we keep track of the transaction stack, which is a bit of a pain. We can discover which statements affect the transaction stack via the authorizor callback.
The state of the `SqliteKv` object could get out-of-sync in the case of rollbacks. Our new `onRollback()` function makes this easy to deal with.
Also if cached alarm changes are rolled back. This replaces the previous invalidation mechanism, which did not properly handle `transactionSync()`. The new mechanism handles all rollbacks, so we don't need the old mechanism at all anymore.
…ION. People mistakenly believed that we didn't support transactions!
`ROLLBACK TO` does not release the savepoint, just rolls back to the point immediately after the savepoint was created. We must additionally release it. This never caused a problem becaues: 1. `transactionSync()` always runs inside an implicit transaction. Committing or rolling back the implicit transaction implicitly releases all the savepoints. 2. It turns out SQLite allows savepoints with the same name as previous ones. The name always refers to the most-recent savepoint by that name which hasn't been released. So, the "leaked" savepoint didn't prevent a new savepoint with the same name from being created later. Note that the async version of `transaction()` does release savepoints properly. I also added a TODO to take advantage of the fact that savepoints can have the same name...
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windows build failure unrelated; fixed in #2891 |
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…dy in a transaction?` Bug introduced in #2866. See comments for explanation.
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…dy in a transaction?` Bug introduced in #2866. See comments for explanation.
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BEGIN TRANSACTION. The "not authorized" error confused people into thinking that transactions weren't supported!RELEASEof savepoints intransactionSync(), although in practice I think it didn't cause any actual problem (see commit description).