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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 MySqlWrapper(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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""" |
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has_lob = 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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'decimal': False, |
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'double': False, |
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'enum': False, |
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'float': False, |
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'int': False, |
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'mediumint': False, |
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'set': False, |
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'smallint': False, |
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'time': False, |
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'timestamp': False, |
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'tinyint': False, |
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'varbinary': False, |
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'varchar': False, |
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'year': False, |
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'blob': True, |
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'longblob': True, |
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'longtext': True, |
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'mediumblob': True, |
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'mediumtext': True, |
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'text': True, |
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'tinyblob': True, |
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'tinytext': 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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def _generate_command(self, routine: Dict[str, Any]) -> str: |
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""" |
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Generates SQL statement for calling a stored routine. |
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:param routine: Metadata of the stored routine. |
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""" |
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parameters = '' |
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placeholders = '' |
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execute = 'call' |
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if routine['designation'] == 'function': |
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execute = 'select' |
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i = 0 |
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l = 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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i += 1 |
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if not re_type == '?': |
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l += 1 |
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if l == 0: |
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line = '"{0!s} {1!s}()"'.format(execute, routine['routine_name']) |
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elif l >= 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 data_type: The parameter type. |
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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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'blob': '%s', |
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'char': '%s', |
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'date': '%s', |
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'datetime': '%s', |
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'decimal': '%s', |
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'double': '%s', |
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'enum': '%s', |
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'float': '%s', |
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'int': '%s', |
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'longblob': '%s', |
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'longtext': '%s', |
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'mediumblob': '%s', |
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'mediumint': '%s', |
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'mediumtext': '%s', |
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'set': '%s', |
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'smallint': '%s', |
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'text': '%s', |
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'time': '%s', |
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'timestamp': '%s', |
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'tinyblob': '%s', |
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'tinyint': '%s', |
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'tinytext': '%s', |
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'varbinary': '%s', |
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'varchar': '%s', |
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'year': '%s'} |
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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-mysql
