Ryan Malloy
888b8079d3
Implements encoders for datetime.timedelta → INTERVAL DAY(9) TO FRACTION(5) and IntervalYM → INTERVAL YEAR(9) TO MONTH. Both follow the 2-byte-length- prefixed BCD wire format established in Phase 6.c (DECIMAL/DATETIME). The default qualifier choice is generous: DAY(9) covers any timedelta, YEAR(9) handles ±1B years. JDBC defaults to smaller widths (DAY(2)/YEAR(4)) trading safety for compactness — we make the opposite trade. FRACTION(5) is the Informix precision ceiling — sub-10us intervals can't round-trip cleanly. Same limitation JDBC has. Six integration tests, all green on first run against live Informix — the synthetic round-trip in the test framework caught every framing bug locally, before integration tests even started. This is the dividend from owning both decoder and encoder. Total: 53 unit + 88 integration = 141 tests. Type matrix update: INTERVAL now has both decode + encode. Only BLOB/CLOB and BYTE/TEXT remain among the common types.
informix-db
Pure-Python driver for IBM Informix IDS, speaking the SQLI wire protocol over raw sockets. No IBM Client SDK. No JVM. No native libraries.
Status
🟢 Phase 1 complete. connect() / close() work end-to-end against a real Informix server. Cursor / execute / fetch land in Phase 2.
To our knowledge this is the first pure-socket Informix driver in any language — every other Informix driver (IfxPy, the legacy informixdb, ODBC bridges, Perl DBD::Informix) wraps either IBM's CSDK or the JDBC JAR.
Quick start
import informix_db
with informix_db.connect(
host="127.0.0.1", port=9088,
user="informix", password="in4mix",
database="sysmaster", server="informix",
) as conn:
# cursor() / execute() / fetchone() arrive in Phase 2
pass
Test against the official Informix dev container
docker compose -f tests/docker-compose.yml up -d # IBM Developer Edition, pinned by digest
uv sync --extra dev
uv run pytest # 34 unit tests (no Docker needed)
uv run pytest -m integration # 6 integration tests (needs the container)
Phase 0 artifacts (still useful — they ARE the public reference)
docs/PROTOCOL_NOTES.md— byte-level wire-format reference, derived from packet captures + JDBC decompilation, validated against a real serverdocs/JDBC_NOTES.md— index into the decompiled IBM JDBC driver's wire-protocol classesdocs/DECISION_LOG.md— running rationale for protocol / auth / type decisionsdocs/CAPTURES/— socat hex-dump captures of three reference scenarios (connect, SELECT, full DML cycle)tests/reference/RefClient.java— re-runnable JDBC ground-truth client for capturing fresh traces
License
MIT.