[this one seems to have been lost in googlegroups too, resending...]
Mike wrote:
>
> I started looking to what is happen to get table information from
> mysql.
>
> I found that the following is issued for every table that is
> reflected:
>
> 2007-07-18 00:29:08,158 INFO sqlalchemy.engine.base.Engine.0x..cc
> show variables like 'character_set%%'
> 2007-07-18 00:29:08,158 INFO sqlalchemy.engine.base.Engine.0x..cc
> None 2007-07-18 00:29:08,161 INFO
> sqlalchemy.engine.base.Engine.0x..cc SHOW VARIABLES LIKE
> 'lower_case_table_names'
> 2007-07-18 00:29:08,161 INFO sqlalchemy.engine.base.Engine.0x..cc
> None 2007-07-18 00:29:08,163 INFO
> sqlalchemy.engine.base.Engine.0x..cc describe `company`
> 2007-07-18 00:29:08,163 INFO sqlalchemy.engine.base.Engine.0x..cc
> {} 2007-07-18 00:29:08,169 INFO
> sqlalchemy.engine.base.Engine.0x..cc SHOW CREATE TABLE `company`
>
>
> I have a slow connection to the database and want to min the
> number of round trips.
> [...]
Hi Mike,
You're right, the lower_case check is really needed only once per
connection and I've added that per-connection cache in r2955 for
0.4. That's as granular as that can get, as the value can change
on a server restart and that can't be detected directly.
The character set can change mid-connection and there's
unfortunately no easy way around performing that check, at least
for 4.1 and higher servers. It would be easier if the driver was
the only mechanism to change the connection character set, but a
variety of user SQL can as well.
Moving all of the MySQL reflection to a SHOW CREATE TABLE parser is
in progress for 0.4. If you have a patch in mind for column
parsing I'd be happy to take a look and include it.
As an aside, starting with 0.3.9 the table metadata is picklable.
Just unpickle it and bind it to an engine, and you can avoid
reflection on your slow link entirely.
-j
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