wjones
a18c6a7386
- Implement pg_vtab as a minimal SQLite virtual table module backed by PostgreSQL. - Create sqlite2pgsql utility for copying tables from SQLite to PostgreSQL. - Add sqlite_pg_plugin to expose PostgreSQL tables to SQLite. - Include Makefile for building the pg_vtab shared object. - Update README with usage instructions and limitations. - Remove obsolete cache.zip file.
1.2 KiB
1.2 KiB
SQLite -> PostgreSQL virtual table (minimal)
This directory contains a minimal SQLite extension that implements a read-only virtual table backed directly by PostgreSQL using libpq.
Build
You need libpq (Postgres client) and a C compiler. On Debian/Ubuntu:
sudo apt-get install libpq-dev build-essential
make
This produces pg_vtab.so.
Usage
Start sqlite3, load the extension and create a virtual table pointing at a Postgres table:
.load ./pg_vtab.so
CREATE VIRTUAL TABLE remote_tbl USING pg_vtab('host=localhost dbname=mydb user=me password=secret', 'public.mytable');
SELECT * FROM remote_tbl LIMIT 10;
Limitations
- Minimal proof-of-concept: supports only full table scans.
- All columns are presented as
TEXT. - No constraint pushdown or type mapping sophistication.
- Error handling and SQL injection hygiene are minimal; do not use on untrusted inputs without review.
Next steps (optional)
- Add support for WHERE constraints and indexed access (
xBestIndex). - Map Postgres types more accurately to SQLite storage classes.
- Implement server-side cursors for large tables.
- Harden error reporting and resource cleanup.