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from abc import ABC |
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from typing import Any, Dict, List |
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from pystratum_common.wrapper.Wrapper import Wrapper |
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class MsSqlWrapper(Wrapper, ABC): |
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""" |
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Parent class for wrapper method generators for stored procedures and functions. |
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""" |
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# ------------------------------------------------------------------------------------------------------------------ |
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def is_lob_parameter(self, parameters: List[Dict[str, Any]]) -> bool: |
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""" |
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Returns True of one of the parameters is a BLOB or CLOB. Otherwise, returns False. |
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:param parameters: The parameters of a stored routine. |
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:rtype: bool: |
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""" |
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has_blob = False |
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lookup = {'bigint': False, |
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'binary': False, |
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'bit': False, |
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'char': False, |
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'date': False, |
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'datetime': False, |
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'datetime2': False, |
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'datetimeoffset': False, |
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'decimal': False, |
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'float': False, |
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'geography': True, |
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'geometry': True, |
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'image': True, |
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'int': False, |
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'money': False, |
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'nchar': False, |
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'ntext': True, |
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'numeric': False, |
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'nvarchar': False, |
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'real': False, |
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'smalldatetime': False, |
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'smallint': False, |
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'smallmoney': False, |
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'text': True, |
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'time': False, |
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'tinyint': False, |
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'varbinary': False, |
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'varchar': False, |
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'xml': 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_blob = lookup[parameter_info['data_type']] |
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else: |
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raise Exception("Unexpected date type '{0}'".format(parameter_info['data_type'])) |
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return has_blob |
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# ------------------------------------------------------------------------------------------------------------------ |
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def _write_routine_method_without_lob(self, routine: Dict[str, Any]) -> str: |
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self._write_line() |
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self._write_separator() |
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self._write_line( |
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'def {0!s}({1!s}):'.format(str(routine['routine_base_name']), str(self._get_wrapper_args(routine)))) |
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self._write_result_handler(routine) |
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return self._code |
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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 routine: Metadata of the stored routine. |
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:rtype: str |
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""" |
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if routine['parameters']: |
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if routine['designation'] == 'function': |
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sql = "'select [%s].[%s](%s)', %s" |
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else: |
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sql = "'exec [%s].[%s] %s', %s" |
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parameters = '' |
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placeholders = '' |
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for parameter in routine['parameters']: |
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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 += self._get_parameter_format_specifier(parameter['data_type']) |
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ret = sql % (routine['schema_name'], |
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routine['routine_base_name'], # routine_base_name |
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placeholders, |
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parameters) |
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else: |
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if routine['designation'] == 'function': |
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sql = "'select [%s].[%s]()'" |
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else: |
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sql = "'exec [%s].[%s]'" |
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ret = sql % (routine['schema_name'], |
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routine['routine_base_name']) |
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return ret |
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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', |
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'binary': '%s', |
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'bit': '%s', |
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'char': '%s', |
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'date': '%s', |
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'datetime': '%s', |
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'datetime2': '%s', |
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'datetimeoffset': '%s', |
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'decimal': '%s', |
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'float': '%s', |
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'geography': '%s', |
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'geometry': '%s', |
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'image': '%s', |
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'int': '%s', |
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'money': '%s', |
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'nchar': '%s', |
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'ntext': '%s', |
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'numeric': '%s', |
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'nvarchar': '%s', |
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'real': '%s', |
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'smalldatetime': '%s', |
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'smallint': '%s', |
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'smallmoney': '%s', |
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'text': '%s', |
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'time': '%s', |
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'timestamp': '%s', |
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'tinyint': '%s', |
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'varbinary': '%s', |
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'varchar': '%s', |
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'xml': '%s'} |
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if data_type in lookup: |
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return '%s' |
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raise Exception('Unexpected data type {0}'.format(data_type)) |
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# ------------------------------------------------------------------------------------------------------------------ |
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@staticmethod |
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def _get_re_type(data_type: str) -> str: |
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lob = '%s' |
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templates = {'bigint': '%s', |
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'binary': '%s', |
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'bit': '%s', |
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'char': '%s', |
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'date': '%s', |
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'datetime': '%s', |
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'datetime2': '%s', |
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'datetimeoffset': '%s', |
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'decimal': '%s', |
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'float': '%s', |
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'image': lob, |
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'geography': lob, |
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'geometry': lob, |
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'int': '%s', |
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'money': '%s', |
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'nchar': '%s', |
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'ntext': lob, |
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'numeric': '%s', |
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'nvarchar': '%s', |
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'real': '%s', |
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'smalldatetime': '%s', |
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'smallint': '%s', |
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'smallmoney': '%s', |
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'text': lob, |
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'time': '%s', |
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'tinyint': '%s', |
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'varbinary': '%s', |
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'varchar': '%s', |
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'xml': lob} |
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if data_type in templates: |
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return templates[data_type] |
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raise Exception('Unexpected data type {0}'.format(data_type)) |
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# ---------------------------------------------------------------------------------------------------------------------- |
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DatabaseStratum /
py-stratum-mssql
