83 lines
No EOL
2.5 KiB
Python
83 lines
No EOL
2.5 KiB
Python
from pypika import MySQLQuery, Order, PostgreSQLQuery, terms
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from pypika.queries import Schema, Table
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from frappe.utils import get_table_name
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from pypika.terms import Function
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class Base:
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terms = terms
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desc = Order.desc
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Schema = Schema
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Table = Table
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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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class MariaDB(Base, MySQLQuery):
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Field = terms.Field
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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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@classmethod
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def into(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().into(table, *args, **kwargs)
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@classmethod
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def update(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().update(table, *args, **kwargs)
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class Postgres(Base, PostgreSQLQuery):
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field_translation = {"table_name": "relname", "table_rows": "n_tup_ins"}
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schema_translation = {"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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@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[table._table_name]
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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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@classmethod
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def into(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().into(table, *args, **kwargs)
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@classmethod
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def update(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().update(table, *args, **kwargs) |