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# flake8: builtins=reveal_type
from __future__ import annotations
from dataclasses import dataclass
from typing import Any, Callable, Dict, Optional, Sequence, Tuple, Union
from psycopg import Connection, Cursor, ServerCursor, connect, rows
from psycopg import AsyncConnection, AsyncCursor, AsyncServerCursor
def int_row_factory(
cursor: Union[Cursor[Any], AsyncCursor[Any]]
) -> Callable[[Sequence[int]], int]:
return lambda values: values[0] if values else 42
@dataclass
class Person:
name: str
address: str
@classmethod
def row_factory(
cls, cursor: Union[Cursor[Any], AsyncCursor[Any]]
) -> Callable[[Sequence[str]], Person]:
def mkrow(values: Sequence[str]) -> Person:
name, address = values
return cls(name, address)
return mkrow
def kwargsf(*, foo: int, bar: int, baz: int) -> int:
return 42
def argsf(foo: int, bar: int, baz: int) -> float:
return 42.0
def check_row_factory_cursor() -> None:
"""Type-check connection.cursor(..., row_factory=<MyRowFactory>) case."""
conn = connect()
cur1: Cursor[Any]
cur1 = conn.cursor()
r1: Optional[Any]
r1 = cur1.fetchone()
r1 is not None
cur2: Cursor[int]
r2: Optional[int]
with conn.cursor(row_factory=int_row_factory) as cur2:
cur2.execute("select 1")
r2 = cur2.fetchone()
r2 and r2 > 0
cur3: ServerCursor[Person]
persons: Sequence[Person]
with conn.cursor(name="s", row_factory=Person.row_factory) as cur3:
cur3.execute("select * from persons where name like 'al%'")
persons = cur3.fetchall()
persons[0].address
async def async_check_row_factory_cursor() -> None:
"""Type-check connection.cursor(..., row_factory=<MyRowFactory>) case."""
conn = await AsyncConnection.connect()
cur1: AsyncCursor[Any]
cur1 = conn.cursor()
r1: Optional[Any]
r1 = await cur1.fetchone()
r1 is not None
cur2: AsyncCursor[int]
r2: Optional[int]
async with conn.cursor(row_factory=int_row_factory) as cur2:
await cur2.execute("select 1")
r2 = await cur2.fetchone()
r2 and r2 > 0
cur3: AsyncServerCursor[Person]
persons: Sequence[Person]
async with conn.cursor(name="s", row_factory=Person.row_factory) as cur3:
await cur3.execute("select * from persons where name like 'al%'")
persons = await cur3.fetchall()
persons[0].address
def check_row_factory_connection() -> None:
"""Type-check connect(..., row_factory=<MyRowFactory>) or
Connection.row_factory cases.
"""
conn1: Connection[int]
cur1: Cursor[int]
r1: Optional[int]
conn1 = connect(row_factory=int_row_factory)
cur1 = conn1.execute("select 1")
r1 = cur1.fetchone()
r1 != 0
with conn1.cursor() as cur1:
cur1.execute("select 2")
conn2: Connection[Person]
cur2: Cursor[Person]
r2: Optional[Person]
conn2 = connect(row_factory=Person.row_factory)
cur2 = conn2.execute("select * from persons")
r2 = cur2.fetchone()
r2 and r2.name
with conn2.cursor() as cur2:
cur2.execute("select 2")
cur3: Cursor[Tuple[Any, ...]]
r3: Optional[Tuple[Any, ...]]
conn3 = connect()
cur3 = conn3.execute("select 3")
with conn3.cursor() as cur3:
cur3.execute("select 42")
r3 = cur3.fetchone()
r3 and len(r3)
async def async_check_row_factory_connection() -> None:
"""Type-check connect(..., row_factory=<MyRowFactory>) or
Connection.row_factory cases.
"""
conn1: AsyncConnection[int]
cur1: AsyncCursor[int]
r1: Optional[int]
conn1 = await AsyncConnection.connect(row_factory=int_row_factory)
cur1 = await conn1.execute("select 1")
r1 = await cur1.fetchone()
r1 != 0
async with conn1.cursor() as cur1:
await cur1.execute("select 2")
conn2: AsyncConnection[Person]
cur2: AsyncCursor[Person]
r2: Optional[Person]
conn2 = await AsyncConnection.connect(row_factory=Person.row_factory)
cur2 = await conn2.execute("select * from persons")
r2 = await cur2.fetchone()
r2 and r2.name
async with conn2.cursor() as cur2:
await cur2.execute("select 2")
cur3: AsyncCursor[Tuple[Any, ...]]
r3: Optional[Tuple[Any, ...]]
conn3 = await AsyncConnection.connect()
cur3 = await conn3.execute("select 3")
async with conn3.cursor() as cur3:
await cur3.execute("select 42")
r3 = await cur3.fetchone()
r3 and len(r3)
def check_row_factories() -> None:
conn1 = connect(row_factory=rows.tuple_row)
v1: Tuple[Any, ...] = conn1.execute("").fetchall()[0]
conn2 = connect(row_factory=rows.dict_row)
v2: Dict[str, Any] = conn2.execute("").fetchall()[0]
conn3 = connect(row_factory=rows.class_row(Person))
v3: Person = conn3.execute("").fetchall()[0]
conn4 = connect(row_factory=rows.args_row(argsf))
v4: float = conn4.execute("").fetchall()[0]
conn5 = connect(row_factory=rows.kwargs_row(kwargsf))
v5: int = conn5.execute("").fetchall()[0]
v1, v2, v3, v4, v5
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