insert multiple rows in one query

[samuelcolvin]

Related to #112, I know executemany is not possible, but I wonder if it would be possible for aiopg (and aiopg-sqlachemy flavour) to support insert with multiple rows. As described here?

Currently, I'm getting

    await request['conn'].execute(q)
  File "/home/samuel/code/socket-server/env/lib/python3.6/site-packages/aiopg/utils.py", line 72, in __await__
    resp = yield from self._coro
  File "/home/samuel/code/socket-server/env/lib/python3.6/site-packages/aiopg/sa/connection.py", line 88, in _execute
    compiled_parameters = [compiled.construct_params(dp)]
  File "/home/samuel/code/socket-server/env/lib/python3.6/site-packages/aiopg/sa/engine.py", line 23, in construct_params
    pd[column.key] = self._exec_default(column.default)
  File "/home/samuel/code/socket-server/env/lib/python3.6/site-packages/aiopg/sa/engine.py", line 31, in _exec_default
    return default.arg
AttributeError: 'Sequence' object has no attribute 'arg'

When trying a query like this.

[samuelcolvin]

example query which would be great but currently gives the above error:

await conn.execute(
    sa_foo_table
    .insert()
    .values([
        dict(name='name1', x=1),
        dict(name='name2', x=2),
        dict(name='name3', x=3),
    ])
)

Surely this can't be impossible with psycopg2 as it's still a single query, just currently not possible with aiopg's sqlachemy integration.

[jettify]

Your approach should work, I do almost the same here
https://github.com/aio-libs/aiohttp_admin/blob/13289d0fc8bb3560dfbe08c1faa8d16093d9e903/demos/blog/aiohttpdemo_blog/generate_data.py#L65

[samuelcolvin]

weird, wonder why I was getting an error before. Sorry.

Might be worth documenting this. I searched the docs for "bulk" and "executemany" and just found the code snippets saying "executemany isn't available".

Perhaps add to the docs "executemany isn't possible with aiopg, however you can still insert data on bulk with something like this [example]".