←back to thread

Show HN: Embed an SQLite database in your PostgreSQL table

(github.com)
172 points frectonz | 2 comments | 19 Nov 24 11:02 UTC | HN request time: 0.5s | source

pglite-fusion is a PostgreSQL extension that allows you to embed SQLite databases into your PostgreSQL tables by enabling the creation of columns with the `SQLITE` type. This means every row in the table can have an embedded SQLite database.

In addition to the PostgreSQL `SQLITE` type, pglite-fusion provides the `query_sqlite`` function for querying SQLite databases and the `execute_sqlite` function for updating them. Additional functions are listed in the project’s README.

The pglite-fusion extension is written in Rust using the pgrx framework [1].

----

Implementation Details

The PostgreSQL `SQLITE` type is stored as a CBOR-encoded `Vec<u8>`. When a query is made, this `Vec<u8>` is written to a random file in the `/tmp` directory. SQLite then loads the file, performs the query, and returns the result as a table containing a single row with an array of JSON-encoded values.

The `execute_sqlite` function follows a similar process. However, instead of returning query results, it returns the contents of the SQLite file (stored in `/tmp`) as a new `SQLITE` instance.

[1] https://github.com/pgcentralfoundation/pgrx

1. BiteCode_dev ◴[19 Nov 24 16:53 UTC] No.42185516[source]▶
Someone, somewhere will eventually find a legitimate use case for it.
replies(1): >>42186135 #
2. NoMoreNicksLeft ◴[19 Nov 24 17:42 UTC] No.42186135[source]▶
We should have a response team standing by, ready to dump thousands of tons of concrete onto that legitimate use case. A gigantic cement sarcophagus that may not solve the problem, but our descendants thousands of years from now may be better prepared to do what we can't and destroy it. The "someone" will just have to be a tragic casualty, as we won't be able to save him or her without risking the contagion spreading.