147 lines
5.0 KiB
Python
147 lines
5.0 KiB
Python
from sqlalchemy import or_, and_, desc, asc
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from sqlalchemy.sql.elements import BooleanClauseList, BinaryExpression, UnaryExpression
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from .AbstractEngine import AbstractEngineClass
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from ..utils.Models import FilterItem, FilterScope
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class MsSqlEngine(AbstractEngineClass):
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def set_joins(self):
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pass
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filters = {}
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rows = []
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sort = None
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async def exe(self):
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_f = self.set_filters()
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if not self.custom_entities:
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query = self.query_class.query(self.model)
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else:
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query = self.query_class.query(*self.custom_entities)
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if self.joins:
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for j in self.joins:
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if isinstance(j, list):
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query = query.join(*j)
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else:
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query = query.join(j)
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if self.options:
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query = query.options(*self.options)
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tmp = query.filter(_f).order_by(self.set_sort())
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self.rows = tmp.limit(self.input.get_limit()).offset(self.input.skip()).all()
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return self.rows, tmp.count(), tmp
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def query_generator(self):
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if not self.input.has_filter():
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return None
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filters = self.input.filters()
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query = self.generate_scope_filter(filters, general=True)
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return query
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def set_sort(self):
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if self.input.o.field:
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self.sort = asc(getattr(self.model, self.input.o.field)) if self.input.o.direction == 'asc' else desc(
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getattr(self.model, self.input.o.field))
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return self.sort
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elif isinstance(self.default_sort_by, UnaryExpression):
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return self.default_sort_by
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else:
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return True
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def set_filters(self):
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filters = []
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query = self.query_generator()
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if isinstance(query, BooleanClauseList) or isinstance(query, BinaryExpression):
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filters.append(query)
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if self.input.has_text_search():
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items = []
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_search_cols = self.input.get_search_cols() if (
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self.input.get_search_cols() and len(self.input.get_search_cols())) else self.search_cols
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if _search_cols:
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for col in _search_cols:
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has_join = len(col.split('.')) > 1
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if has_join:
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pass
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else:
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items.append(
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getattr(self.model, col).ilike("%{search}%".format(search=self.input.get_text_search())))
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filters.append(or_(*items))
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if self.input.extra_filter:
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for f in self.input.extra_filter:
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filters.append(f)
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if not filters:
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return True
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self.filters = and_(*filters)
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return self.filters
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@staticmethod
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def get_expression_filter(col=None, op: str = '', val: str = '') -> dict:
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_op = MsSqlEngine.get_operator(op)
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return getattr(col, op)(val)
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@staticmethod
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def get_operator(op: str):
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ops = {
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"eq": "__eq__",
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"n_eq": "__ne__",
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"gt": "__gt__",
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"gte": "__ge__",
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"lte": "__lte__",
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"lt": "__lt__",
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"like": "ilike",
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"n_like": "notlike",
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"in": "in_",
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"n_in": "not_in",
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"bet": "between",
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"n_bet": "not_between",
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"sw": "startswith",
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"ew": "endswith",
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'n_ew': 'not_endswith',
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'n_sw': 'not_startswith',
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'exi': 'exi',
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"n_exi": "n_exi",
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}
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return ops[op] if op in ops else '__eq__'
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@staticmethod
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def get_and_or(op):
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return or_ if op == 'or' else and_
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def count(self):
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pass
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def filter_item_generator(self, item: FilterItem):
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has_join = len(item.col.split('.')) > 1
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if has_join:
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pass
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else:
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return getattr(getattr(self.model, item.col), self.get_operator(item.op))(item.val)
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def generate_scope_filter(self, filters: list, general=False):
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if len(filters) == 1:
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_o = filters[0]
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if isinstance(_o, FilterItem):
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return self.filter_item_generator(filters[0])
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elif isinstance(_o, FilterScope):
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return self.generate_scope_filter(_o.items)
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else:
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return _o
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else:
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_a = filters.pop(0)
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_a = (self.filter_item_generator(_a) if isinstance(_a,
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FilterItem) else _a) if not general else (
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self.generate_scope_filter(_a.items) if isinstance(_a, FilterScope) else _a)
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_b = filters.pop(0)
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_op = MsSqlEngine.get_and_or(_b.cr if not general else _b.op)
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_b = (self.filter_item_generator(_b) if isinstance(_b,
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FilterItem) else _b) if not general else (
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self.generate_scope_filter(_b.items) if isinstance(_b, FilterScope) else _b)
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filters = [_op(_a, _b)] + filters
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return self.generate_scope_filter(filters, general)
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