def _execute(self, *a, **b):
query = a[0]
logger.debug('DB query: %s' % query)
t0 = time.time()
try:
result = self.cursor.execute(*a, **b)
except Exception:
logger.warning(query)
raise
self._timings.append((query, round(time.time() - t0, 4)))
return result
def render(cls, value, castField = None):
"""Render of a value (Expression, Field or simple (scalar?) value) in a format suitable for
operations with castField in the DB.
"""
if isinstance(value, orm.Expression): # it's an Expression or Field
if isinstance(value, orm.DateTimeField):
pass
return value.__str__(cls) # render sub-expression
else: # it's a value for a DB column
if value is not None and castField is not None:
assert isinstance(castField, orm.Expression), 'Cast field must be an Expression.'
if castField.__class__ is orm.Expression: # Field - subclass of Expression
castField = castField.type # expression right operand type
value = castField.cast(value)
try:
return cls._render(value, castField.column)
except Exception:
logger.warning('Check %r._cast().' % castField)
raise
return cls._render(value)