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import os |
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class ResultException(RuntimeError): |
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""" |
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Exception for situations where the result (set) of a query does not meet the expectations. Either a mismatch between |
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the actual and expected numbers of rows selected or an unexpected NULL value was selected. |
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""" |
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# ------------------------------------------------------------------------------------------------------------------ |
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def __init__(self, expected_row_count: str, actual_row_count: int, query: str): |
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""" |
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Object constructor. |
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:param str expected_row_count: The expected row count. |
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:param int actual_row_count: The actual row count. |
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:param str query: The query. |
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""" |
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RuntimeError.__init__(self, self.__message(expected_row_count, actual_row_count, query)) |
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self._expected_row_count: str = expected_row_count |
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""" |
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The expected row count. |
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""" |
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self._actual_row_count: int = actual_row_count |
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""" |
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The actual row count. |
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""" |
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self._query: str = query |
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""" |
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The query. |
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""" |
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# ------------------------------------------------------------------------------------------------------------------ |
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@property |
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def expected_row_count(self) -> str: |
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""" |
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The expected row count. |
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:rtype: str |
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""" |
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return self._expected_row_count |
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# ------------------------------------------------------------------------------------------------------------------ |
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@property |
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def actual_row_count(self) -> int: |
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""" |
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The actual row count. |
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:rtype: str |
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""" |
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return self._actual_row_count |
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# ------------------------------------------------------------------------------------------------------------------ |
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@property |
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def query(self) -> str: |
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""" |
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The query. |
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:rtype: str |
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""" |
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return self._query |
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# ------------------------------------------------------------------------------------------------------------------ |
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@staticmethod |
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def __message(expected_row_count: str, actual_row_count: int, query: str) -> str: |
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""" |
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Composes the exception message. |
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:param str expected_row_count: The expected row count. |
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:param int actual_row_count: The actual row count. |
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:param str query: The query. |
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:rtype: str |
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""" |
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query = query.strip() |
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message = 'Wrong number of rows selected' |
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message += os.linesep |
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message += 'Expected number of rows: {}'.format(expected_row_count) |
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message += os.linesep |
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message += 'Actual number of rows: {}'.format(actual_row_count) |
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message += os.linesep |
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message += 'Query:' |
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message += os.linesep if os.linesep in query else ' ' |
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message += query |
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return message |
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# ---------------------------------------------------------------------------------------------------------------------- |
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DatabaseStratum /
py-stratum-middle
