Class _part
source code
- Known Subclasses:
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clause,
column,
statement,
identifyer,
relation
The _part class is the base class for all SQL statement classes. It
proviedes a __str__() method, which calls __sql__() with a minimal
standard datasource that will yield SQL92 compliant results.
_part instances are not hashable. This is due to the fact that they
are mutable and I don't want to change that. Ignoring the conflict
between hashability and mutablity would not result in problems in many
cases, but problems it would cause, would be *very* hard to track down
(things would suddenly disappear from dicts, see Python Reference Manual
chap. 3.3.1).
If you need to use SQL objects as dictionary keys or sets use the
orm2.util.stupid_dict class, which implements the mapping interface
without relying on hashing. (It uses sequential search instead, so it's
not suitable for large datasets.) See the datasource.select() method for
an example on how to use stupid_dict instead of Set.
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__sql__(self,
runner)
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__str__(self)
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__eq__(self,
other)
Two SQL statements are considered equal if attributes containing
strings or statements are equal.
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__ne__(self,
other)
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__str__(self)
(Informal representation operator)
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None
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Two SQL statements are considered equal if attributes containing
strings or statements are equal. (That means, that this method will be
called recursivly at times.
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