extensions.py 文件源码

def _adapt_from_python(value):
    if not isinstance(value, basestring):
        adapter_key = (type(value), sqlite3.PrepareProtocol)
        adapter = adapters.get(adapter_key)
        try:
            if adapter is None:
                # Fall back to _default_adapters, so that ObjectAdaptationTests
                # teardown will correctly restore the default state.
                adapter = _default_adapters[adapter_key]
        except KeyError as e:
            # No adapter registered. Let the object adapt itself via PEP-246.
            # It has been rejected by the BDFL, but is still implemented
            # on stdlib sqlite3 module even on Python 3 !!
            if hasattr(value, '__adapt__'):
                adapted = value.__adapt__(sqlite3.PrepareProtocol)
            elif hasattr(value, '__conform__'):
                adapted = value.__conform__(sqlite3.PrepareProtocol)
            else:
                raise InterfaceError(e)
        else:
            adapted = adapter(value)
    else:
        adapted = value

    # The adapter could had returned a string
    if isinstance(adapted, (bytes, unicode)):
        adapted = _escape_string(adapted)
    elif adapted is None:
        adapted = 'NULL'
    else:
        adapted = str(adapted)

    return adapted