1f7191421a
Add to_jsonable() (Access/pyodbc value -> JSON-safe) with strict TDD (5 tests: datetime iso, bool preserved before int, decimal->str, none/numbers, dict round-trip). bool branch precedes int because bool is a subclass of int in Python. Add AccessReader: reads TableChangeLog (read_log), reads a full source row by RecordID via to_jsonable (read_row, warns on >4000-char values that JSON_VALUE would truncate), and deletes processed log IDs in chunked, retried batches (delete_log_ids, no-op on empty list). Connects via the ACE ODBC driver from config.access.driver, shared autocommit mode to coexist with the live .laccdb client. Integration test against the real 氩弧焊.accdb (read-only; delete_log_ids only exercised with []) passes. Co-Authored-By: Claude <noreply@anthropic.com>
35 lines
1.2 KiB
Python
35 lines
1.2 KiB
Python
"""Access value serialization helpers.
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Converts pyodbc/Access cell values into JSON-serializable Python types so a
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captured row dict can be ``json.dumps``-ed before being enqueued on SQL Server.
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Order matters: ``bool`` MUST be checked before ``int`` because ``bool`` is a
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subclass of ``int`` in Python (``isinstance(True, int) is True``). If the order
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were reversed, ``True`` would be returned as ``1`` and lose its type.
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"""
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import datetime
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import decimal
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def to_jsonable(v):
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"""Coerce a single Access/pyodbc value to a JSON-serializable form.
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- ``None`` -> ``None``
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- ``bool`` -> ``bool`` (must precede the ``int`` branch)
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- ``datetime``/``date`` -> ISO-8601 string (``"2026-07-14T08:41:18"``)
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- ``Decimal`` -> string (preserves exact scale, e.g. ``"12.50"``)
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- ``int``/``float``/``str`` -> unchanged
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- anything else (e.g. ``bytes`` for OLE) -> ``str(v)`` fallback
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"""
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if v is None:
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return None
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if isinstance(v, bool): # MUST be before int
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return v
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if isinstance(v, (datetime.datetime, datetime.date)):
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return v.isoformat()
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if isinstance(v, decimal.Decimal):
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return str(v)
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if isinstance(v, (int, float, str)):
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return v
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return str(v)
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