115 lines
3.5 KiB
Python
115 lines
3.5 KiB
Python
import types
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import typing
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from pypika import MySQLQuery, Order, PostgreSQLQuery, SQLLiteQuery, terms
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from pypika.dialects import MySQLQueryBuilder, PostgreSQLQueryBuilder, SQLLiteQueryBuilder
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from pypika.queries import QueryBuilder, Schema, Table
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from pypika.terms import Function
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from frappe.query_builder.terms import ParameterizedValueWrapper, SQLiteParameterizedValueWrapper
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from frappe.utils import get_table_name
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class Base:
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terms = terms
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desc = Order.desc
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asc = Order.asc
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Schema = Schema
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Table = Table
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# Added dynamic type hints for engine attribute
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# which is to be assigned later.
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if typing.TYPE_CHECKING:
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from frappe.database.query import Engine
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engine: Engine
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@staticmethod
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def functions(name: str, *args, **kwargs) -> Function:
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return Function(name, *args, **kwargs)
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@staticmethod
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def DocType(table_name: str, *args, **kwargs) -> Table:
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table_name = get_table_name(table_name)
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return Table(table_name, *args, **kwargs)
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@classmethod
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def into(cls, table, *args, **kwargs) -> QueryBuilder:
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if isinstance(table, str):
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table = cls.DocType(table)
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return super().into(table, *args, **kwargs)
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@classmethod
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def update(cls, table, *args, **kwargs) -> QueryBuilder:
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if isinstance(table, str):
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table = cls.DocType(table)
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return super().update(table, *args, **kwargs)
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class MariaDB(Base, MySQLQuery):
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Field = terms.Field
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_BuilderClasss = MySQLQueryBuilder
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@classmethod
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def _builder(cls, *args, **kwargs) -> "MySQLQueryBuilder":
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return super()._builder(*args, wrapper_cls=ParameterizedValueWrapper, **kwargs)
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@classmethod
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def from_(cls, table, *args, **kwargs):
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if isinstance(table, str):
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table = cls.DocType(table)
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return super().from_(table, *args, **kwargs)
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class Postgres(Base, PostgreSQLQuery):
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field_translation = types.MappingProxyType({"table_name": "relname", "table_rows": "n_tup_ins"})
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schema_translation = types.MappingProxyType({"tables": "pg_stat_all_tables"})
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# TODO: Find a better way to do this
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# These are interdependent query changes that need fixing. These
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# translations happen in the same query. But there is no check to see if
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# the Fields are changed only when a particular `information_schema` schema
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# is used. Replacing them is not straightforward because the "from_"
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# function can not see the arguments passed to the "select" function as
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# they are two different objects. The quick fix used here is to replace the
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# Field names in the "Field" function.
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_BuilderClasss = PostgreSQLQueryBuilder
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@classmethod
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def _builder(cls, *args, **kwargs) -> "PostgreSQLQueryBuilder":
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return super()._builder(*args, wrapper_cls=ParameterizedValueWrapper, **kwargs)
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@classmethod
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def Field(cls, field_name, *args, **kwargs):
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if field_name in cls.field_translation:
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field_name = cls.field_translation[field_name]
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return terms.Field(field_name, *args, **kwargs)
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@classmethod
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def from_(cls, table, *args, **kwargs):
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if isinstance(table, Table):
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if table._schema:
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if table._schema._name == "information_schema":
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table = cls.schema_translation.get(table._table_name) or table
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elif isinstance(table, str):
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table = cls.DocType(table)
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return super().from_(table, *args, **kwargs)
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class SQLite(Base, SQLLiteQuery):
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Field = terms.Field
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_BuilderClasss = SQLLiteQueryBuilder
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@classmethod
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def _builder(cls, *args, **kwargs) -> "SQLLiteQueryBuilder":
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return super()._builder(*args, wrapper_cls=SQLiteParameterizedValueWrapper, **kwargs)
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@classmethod
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def from_(cls, table, *args, **kwargs):
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if isinstance(table, str):
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table = cls.DocType(table)
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return super().from_(table, *args, **kwargs)
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