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[aiohttp] - use batch updates #9932

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Jun 9, 2025
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[aiohttp] - use batch updates #9932

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14 changes: 10 additions & 4 deletions frameworks/Python/aiohttp/app/views.py
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Original file line number Diff line number Diff line change
Expand Up @@ -27,6 +27,7 @@ def json_response(payload):
READ_SELECT_ORM = select(World.randomnumber).where(World.id == bindparam("id"))
READ_FORTUNES_ORM = select(Fortune.id, Fortune.message)
WRITE_ROW_SQL = 'UPDATE "world" SET "randomnumber"=$2 WHERE id=$1'
WRITE_ROW_BATCH_SQL = 'UPDATE "world" w SET "randomnumber"=u.new_val FROM (SELECT unnest($1::int[]) as id, unnest($2::int[]) as new_val) u WHERE w.id = u.id'

template_path = Path(__file__).parent / 'templates' / 'fortune.jinja'
template = jinja2.Template(template_path.read_text())
Expand Down Expand Up @@ -155,15 +156,20 @@ async def updates_raw(request):
num_queries = get_num_queries(request)
update_ids = sample(range(1, 10001), num_queries)
update_ids.sort()
fetch_params = tuple((i, ) for i in update_ids)
updates = tuple(zip(update_ids, sample(range(1, 10001), num_queries)))
worlds = [{'id': row_id, 'randomNumber': number} for row_id, number in updates]

numbers = sample(range(1, 10001), num_queries)
fetch_params = [(i,) for i in update_ids]
row_updates = [*zip(update_ids, numbers)]

async with request.app['pg'].acquire() as conn:
# the result of this is the int previous random number which we don't actually use
await conn.executemany(READ_ROW_SQL, fetch_params)
await conn.executemany(WRITE_ROW_SQL, updates)
if num_queries <= 5:
await conn.executemany(WRITE_ROW_SQL, row_updates)
else:
await conn.execute(WRITE_ROW_BATCH_SQL, update_ids, numbers)

worlds = [{'id': row_id, 'randomNumber': number} for row_id, number in row_updates]
return json_response(worlds)


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