# sqlite3 --- DB-API 2.0 interface for SQLite databases — Adapter and converter recipes

> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ This section shows recipes for common adapters and converters.

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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

This section shows recipes for common adapters and converters.

import datetime as dt import sqlite3

def adapt_date_iso(val): """Adapt datetime.date to ISO 8601 date.""" return val.isoformat()

def adapt_datetime_iso(val): """Adapt datetime.datetime to timezone-naive ISO 8601 date.""" return val.replace(tzinfo=None).isoformat()

def adapt_datetime_epoch(val): """Adapt datetime.datetime to Unix timestamp.""" return int(val.timestamp())

sqlite3.register_adapter(dt.date, adapt_date_iso) sqlite3.register_adapter(dt.datetime, adapt_datetime_iso) sqlite3.register_adapter(dt.datetime, adapt_datetime_epoch)

def convert_date(val): """Convert ISO 8601 date to datetime.date object.""" return dt.date.fromisoformat(val.decode())

def convert_datetime(val): """Convert ISO 8601 datetime to datetime.datetime object.""" return dt.datetime.fromisoformat(val.decode())

def convert_timestamp(val): """Convert Unix epoch timestamp to datetime.datetime object.""" return dt.datetime.fromtimestamp(int(val))

sqlite3.register_converter("date", convert_date) sqlite3.register_converter("datetime", convert_datetime) sqlite3.register_converter("timestamp", convert_timestamp)

when = dt.datetime(2019, 5, 18, 15, 17, 8, 123456)

assert adapt_date_iso(when.date()) == "2019-05-18" assert convert_date(b"2019-05-18") == when.date()

assert adapt_datetime_iso(when) == "2019-05-18T15:17:08.123456" assert convert_datetime(b"2019-05-18T15:17:08.123456") == when

# Using current time as fromtimestamp() returns local date/time. # Dropping microseconds as adapt_datetime_epoch truncates fractional second part. now = dt.datetime.now().replace(microsecond=0) current_timestamp = int(now.timestamp())

assert adapt_datetime_epoch(now) == current_timestamp assert convert_timestamp(str(current_timestamp).encode()) == now

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