1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
|
# flake8: builtins=reveal_type
from __future__ import annotations
from typing import Any
from dataclasses import dataclass
from collections.abc import Callable, Sequence
from psycopg import AsyncConnection, AsyncCursor, AsyncServerCursor, Connection, Cursor
from psycopg import ServerCursor, connect, rows
def int_row_factory(
cursor: 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: 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: Any | None
r1 = cur1.fetchone()
r1 is not None
cur2: Cursor[int]
r2: int | None
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: Any | None
r1 = await cur1.fetchone()
r1 is not None
cur2: AsyncCursor[int]
r2: int | None
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: int | None
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: Person | None
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: tuple[Any, ...] | None
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: int | None
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: Person | None
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: tuple[Any, ...] | None
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
|
