rewrite: Update data ORM.

Fix parsing bug in Update Query.
Fix parsing bug in Insert Query.

Add mapping interface to Model.
Implement OrderMixin, with ORDER and NULLS Enums.
Add `result` field to Query.

bot/data/queries.py

@@ -1,4 +1,6 @@
 from typing import Optional, TypeVar, Any, Callable, Generic, List, Union
+from enum import Enum
+from itertools import chain
 from psycopg import AsyncConnection, AsyncCursor
 from psycopg import sql
 from psycopg.rows import DictRow
@@ -23,7 +25,7 @@ class Query(Generic[QueryResult]):
     """
     ABC for an executable query statement.
     """
-    __slots__ = ('conn', 'cursor', '_adapter', 'connector')
+    __slots__ = ('conn', 'cursor', '_adapter', 'connector', 'result')
 
     _adapter: Callable[..., QueryResult]
 
@@ -37,6 +39,8 @@ class Query(Generic[QueryResult]):
         else:
             self._adapter = self._no_adapter
 
+        self.result: Optional[QueryResult] = None
+
     def bind(self, connector: Connector):
         self.connector = connector
         return self
@@ -74,7 +78,8 @@ class Query(Generic[QueryResult]):
         # )
         await cursor.execute(sql.Composed((query,)), values)
         data = await cursor.fetchall()
-        return self._adapter(*data)
+        self.result = self._adapter(*data)
+        return self.result
 
     async def execute(self, cursor=None) -> QueryResult:
         """
@@ -258,27 +263,50 @@ class LimitMixin(TableQuery[QueryResult]):
             return None
 
 
+class ORDER(Enum):
+    ASC = sql.SQL('ASC')
+    DESC = sql.SQL('DESC')
+
+
+class NULLS(Enum):
+    FIRST = sql.SQL('NULLS FIRST')
+    LAST = sql.SQL('NULLS LAST')
+
+
 class OrderMixin(TableQuery[QueryResult]):
     __slots__ = ()
 
     def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
 
-        self._order: Optional[sql.Composable] = None
+        self._order: list[Expression] = []
 
-    def order_by(self, expression, direction=None, nulls=None):
+    def order_by(self, expr: Union[Expression, str], direction: Optional[ORDER] = None, nulls: Optional[NULLS] = None):
         """
         Add a single sort expression to the query.
         This method stacks.
         """
-        # TODO: Accept a ColumnExpression, string, or sql Composable
-        # TODO: Enums for direction (ORDER.ASC or ORDER.DESC) and nulls (NULLS.FIRST, NULLS.LAST)
-        ...
+        if isinstance(expr, Expression):
+            string, values = expr.as_tuple()
+        else:
+            string = sql.Identifier(expr)
+            values = ()
+
+        parts = [string]
+        if direction is not None:
+            parts.append(direction.value)
+        if nulls is not None:
+            parts.append(nulls.value)
+
+        order_string = sql.SQL(' ').join(parts)
+        self._order.append(RawExpr(order_string, values))
+        return self
 
     @property
     def _order_section(self) -> Optional[Expression]:
         if self._order is not None:
-            return RawExpr(sql.SQL("ORDER BY {}").format(self._order), ())
+            expr = RawExpr.join(*self._order, joiner=sql.SQL(', '))
+            expr.expr = sql.SQL("ORDER BY {}").formt(expr.expr)
         else:
             return None
 
@@ -314,6 +342,7 @@ class Insert(ExtraMixin, TableQuery[QueryResult]):
 
         self._columns = columns
         self._values = values
+        return self
 
     def build(self):
         columns = sql.SQL(',').join(map(sql.Identifier, self._columns))
@@ -324,14 +353,14 @@ class Insert(ExtraMixin, TableQuery[QueryResult]):
 
         # TODO: Check efficiency of inserting multiple values like this
         # Also implement a Copy query
-        base = sql.Sql("INSERT INTO {table} {columns} VALUES {values_str}").format(
+        base = sql.SQL("INSERT INTO {table} ({columns}) VALUES {values_str}").format(
             table=sql.Identifier(self.table),
             columns=columns,
             values_str=values_str
         )
 
         sections = [
-            RawExpr(base),
+            RawExpr(base, tuple(chain(*self._values))),
             self._extra_section,
             RawExpr(sql.SQL('RETURNING *'))
         ]
@@ -440,7 +469,7 @@ class Update(LimitMixin, WhereMixin, ExtraMixin, TableQuery[QueryResult]):
             if isinstance(value, Expression):
                 value_tup = value.as_tuple()
             else:
-                value_tup = (sql.Placeholder(), value)
+                value_tup = (sql.Placeholder(), (value,))
 
             exprs.append(
                 RawExpr.join_tuples(