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import abc |
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from typing import Any, Dict |
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from pystratum_common.wrapper.Wrapper import Wrapper |
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class PgSqlWrapper(Wrapper): |
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""" |
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Parent class for wrapper method generators for stored functions. |
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""" |
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# ------------------------------------------------------------------------------------------------------------------ |
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def is_lob_parameter(self, parameters): |
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""" |
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Returns True if one of the parameters is a BLOB or CLOB. Otherwise, returns False. |
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:param list[dict[str,str]] parameters: The parameters of a stored routine. |
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:rtype: bool |
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""" |
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has_lob = False |
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lookup = {'bigint': False, |
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'integer': False, |
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'bit': False, |
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'smallint': False, |
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'money': False, |
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'numeric': False, |
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'real': False, |
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'character': False, |
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'character varying': False, |
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'timestamp without time zone': False, |
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'time without time zone': False, |
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'date': False, |
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'boolean': False, |
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'bytea': True, |
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'text': True} |
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if parameters: |
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for parameter_info in parameters: |
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if parameter_info['data_type'] in lookup: |
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has_lob = lookup[parameter_info['data_type']] |
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else: |
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raise Exception("Unexpected date type '{0!s}'.".format(parameter_info['data_type'])) |
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return has_lob |
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# ------------------------------------------------------------------------------------------------------------------ |
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@abc.abstractmethod |
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def _write_result_handler(self, routine: Dict[str, Any]) -> None: |
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""" |
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Generates code of the return statement of the wrapper method for invoking a stored routine. |
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:param dict routine: Metadata of the stored routine. |
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""" |
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raise NotImplementedError() |
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# ------------------------------------------------------------------------------------------------------------------ |
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def _generate_command(self, routine: Dict[str, Any]) -> str: |
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""" |
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Returns a SQL-statement for calling a stored routine. |
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:param dict routine: Metadata of the stored routine. |
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:rtype: str |
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""" |
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parameters = '' |
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placeholders = '' |
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execute = 'select' |
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parameter_count = 0 |
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for parameter in routine['parameters']: |
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re_type = self._get_parameter_format_specifier(parameter['data_type']) |
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if parameters: |
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parameters += ', ' |
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placeholders += ', ' |
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parameters += parameter['name'] |
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placeholders += re_type |
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if not re_type == '?': |
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parameter_count += 1 |
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if parameter_count == 0: |
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line = '"{0!s} {1!s}()"'.format(execute, routine['routine_name']) |
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elif parameter_count >= 1: |
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line = '"{0!s} {1!s}({2!s})", {3!s}'.format(execute, routine['routine_name'], placeholders, parameters) |
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else: |
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raise Exception('Internal error.') |
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return line |
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# ------------------------------------------------------------------------------------------------------------------ |
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@staticmethod |
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def _get_parameter_format_specifier(data_type: str) -> str: |
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""" |
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Returns the appropriate format specifier for a parameter type. |
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:param str data_type: The parameter type. |
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:rtype: str |
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""" |
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lookup = {'bigint': '%s::bigint', |
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'integer': '%s::int', |
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'bit': '%s::bit(4)', |
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'smallint': '%s::smallint', |
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'money': '%s::money', |
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'numeric': '%s::numeric', |
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'real': '%s::real', |
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'character': '%s::char', |
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'character varying': '%s::varchar', |
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'timestamp without time zone': '%s::timestamp', |
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'time without time zone': '%s::timestamp', |
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'boolean': '%s::bool', |
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'date': '%s::date', |
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'bytea': '%s::bytea', |
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'text': '%s::text'} |
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if data_type in lookup: |
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return lookup[data_type] |
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raise Exception('Unexpected data type {0!s}.'.format(data_type)) |
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# --------------------------------------------------------------------------------------------------------------------- |
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DatabaseStratum /
py-stratum-pgsql
