racket/collects/db/TODO
Ryan Culpepper 00fd18bc62 db: various fixes and additions
- fix connection-pool for nested tx, fix race condition
 - ensure connected? always nonblocking
 - added and reorganized some doc sections
 - added grouping, contracts to in-query
 - added rows->dict
2012-05-09 09:17:52 -06:00

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- type annotations
- two modes: mandatory and opportunistic
- on result fields (eg sqlite, convert to date)
- on parameters ???
- per query or per connection? (or both?)
- either only well-known conversions, or must apply outside of lock
- postgresql record type: docs, send
- postgresql domain types, table record types, etc
- for wrapped/managed connections, detect if underlying connection gets
disconnected by server (eg, times out after 10 minutes of inactivity)
- at least, pool should make sure connection is alive when gotten from idle list
- add {keepalive : -> boolean} method to connection<%> (?)
- disconnect on custudian shutdown (?)
- disconnect should always work, even on thread-damaged connections
- but might need version with timeout and/or rudely? flag, because
I can't think of a way to solve the lock problem that doesn't involve aux thread.
- add recursive locking?
- cons: - considered by experts to be bad design, sloppy
- pros: - would simplify cleanup for one-shot pstmts
- would enable simple impl of user-level 'call-with-lock' for grouping
multiple operations together
(but this could also be done by two locks: outer "ownership" lock
and inner "invariant-protecting" lock)
- make implementation notes section of docs
- explain nested tx impl
- invalidate statement cache on query error
- 2 call-with-transactions from separate threads can conflict