db: trim todo file

collects/db/TODO

@@ -1,15 +1,3 @@
-----
-
-Testing
-
-- run ODBC tests on Mac
-- run ODBC DB2, Oracle tests on win32; also test SQL Server ?
-- test util/connect features
-- test transaction functions
-
-----
-
-Types
 
 - type annotations
   - two modes: mandatory and opportunistic
@@ -21,60 +9,17 @@ Types
 - postgresql record type: docs, send
 - postgresql domain types, table record types, etc
 
-- util/postgresql: add inet types
-- util/geometry: add WKT functions
-
-- add support for ODBC intervals (no point w/o driver to test with)
-
-----
-
-Misc
-
-- internal docs
-
-- use ffi/unsafe/alloc to simplify odbc handle allocation
-
-- add ODBC-like functions for inspecting schemas (list-tables, 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<%> (?)
 
-- document/enumerate errors
-- document exn:fail:sql, when used, when not used, links to SQLSTATE docs?
-
 - 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.
 
-- finish transaction api: tests, custom sqlite options (?), custom mysql options (?)
-  - add connect option #:rollback-invalid-transactions? (?)
-
-- identify common ODBC errors that can't possibly rollback transaction
-  - test with PostgreSQL ODBC driver using "rollback on all errors" mode
-
-- more ODBC information (?)
-  SQLGetInfo:
-  - SQL_CONVERT_<datatype> - use to refine supported types (?)
-  - SQL_CURSOR_{COMMIT,ROLLBACK}_BEHAVIOR - check that commit/rollback doesn't delete pstmts!
-  - SQL_MAX_{CATALOG,COLUMN,IDENTIFIER,SCHEMA_NAME,TABLE_NAME}_NAME (min 128)
-
-- add evt versions of functions
-  - for query functions (?)
-  - connection-pool-lease-evt
-  - when is it useful in practice?
-    - would make it easier to handle timeouts...
-
-- on insert, return last inserted id
-  - postgresql: parse CommandComplete msg tag
-  - mysql: in ok-packet (what conditions, though?)
-  - sqlite3: sqlite3_last_insert_rowid(), use sqlite3_changes() to see if insert succeeded,
-    but still need to tell if stmt was even insert (parse sql?)
-  - odbc: ???
-
 - add recursive locking?
   - cons: - considered by experts to be bad design, sloppy
   - pros: - would simplify cleanup for one-shot pstmts
@@ -85,31 +30,6 @@ Misc
 
 - audit code for break-safety, disable breaks as needed
 
-- dialect info for ODBC
-  - can get some tx data from ODBC...
-  - on the other hand, not supposed to do tx-SQL in ODBC anyway, so low-priority
-
 - make implementation notes section of docs
   - explain cursor impl (& rationale)
   - explain nested tx impl
-  - ...
-
-- better query path: IMMEDIATE STATEMENTS vs PREPARED STATEMENT CACHE
-  - IMMEDIATE STATEMENTS
-    In pg terms, pipeline Parse and Bind (ie, 1 round-trip instead of 2).
-    Can do immediate query with args using typeids of parameters
-    - problem: results in worse error messages
-    - problem: error invalidates tx (in pg)
-    - problem: same problem exists even with no args: arity errors
-    - benefit: I like the code cleanup.
-  - PREPARED STATEMENT CACHE
-    Add sql=>pstmt cache in collection.
-    - schema can change without warning, invalidate pst type information
-      - mitigation: only cache w/in tx (but is isolation level sufficient?)
-        and clear cache on any tx rollback or potential ddl stmt
-    - problem: (cached) prepare and query not done atomically (two lock entries)
-      so a statement can be invalidated between cache retrieval and execution
-
-- support logging
-
-- audit: make sure no output within atomic section (in drracket, may thread switch)