
Security News
Vite Releases Technical Preview of Rolldown-Vite, a Rust-Based Bundler
Vite releases Rolldown-Vite, a Rust-based bundler preview offering faster builds and lower memory usage as a drop-in replacement for Vite.
Python function to extract all the rows from a SQLite database file concurrently with iterating over its bytes, without needing random access to the file
Python function to extract all the rows from a SQLite database file concurrently with iterating over its bytes, without needing random access to the file.
Note that the SQLite file format is not designed to be streamed; the data is arranged in pages of a fixed number of bytes, and the information to identify a page often comes after the page in the stream (sometimes a great deal after). Therefore, pages are buffered in memory until they can be identified.
pip install stream-sqlite
from stream_sqlite import stream_sqlite
import httpx
# Iterable that yields the bytes of a sqlite file
def sqlite_bytes():
with httpx.stream('GET', 'http://www.parlgov.org/static/stable/2020/parlgov-stable.db') as r:
yield from r.iter_bytes(chunk_size=65_536)
# If there is a single table in the file, there will be exactly one iteration of the outer loop.
# If there are multiple tables, each can appear multiple times.
for table_name, pragma_table_info, rows in stream_sqlite(sqlite_bytes(), max_buffer_size=1_048_576):
for row in rows:
print(row)
If you have control over the SQLite file, VACUUM;
should be run on it before streaming. In addition to minimising the size of the file, VACUUM;
arranges the pages in a way that often reduces the buffering required when streaming. This is especially true if it was the target of intermingled INSERT
s and/or DELETE
s over multiple tables.
Also, indexes are not used for extracting the rows while streaming. If streaming is the only use case of the SQLite file, and you have control over it, indexes should be removed, and VACUUM;
then run.
Some tests suggest that if the file is written in autovacuum mode, i.e. PRAGMA auto_vacuum = FULL;
, then the pages are arranged in a way that reduces the buffering required when streaming. Your mileage may vary.
FAQs
Python function to extract all the rows from a SQLite database file concurrently with iterating over its bytes, without needing random access to the file
We found that stream-sqlite demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 1 open source maintainer collaborating on the project.
Did you know?
Socket for GitHub automatically highlights issues in each pull request and monitors the health of all your open source dependencies. Discover the contents of your packages and block harmful activity before you install or update your dependencies.
Security News
Vite releases Rolldown-Vite, a Rust-based bundler preview offering faster builds and lower memory usage as a drop-in replacement for Vite.
Research
Security News
A malicious npm typosquat uses remote commands to silently delete entire project directories after a single mistyped install.
Research
Security News
Malicious PyPI package semantic-types steals Solana private keys via transitive dependency installs using monkey patching and blockchain exfiltration.