mirror of
https://github.com/PiBrewing/craftbeerpi4.git
synced 2024-11-23 15:38:14 +01:00
100 lines
3 KiB
Python
100 lines
3 KiB
Python
|
# Copyright 2018 John Reese
|
||
|
|
# Licensed under the MIT license
|
||
|
|
|
||
|
|
import sqlite3
|
||
|
|
from typing import TYPE_CHECKING, Any, AsyncIterator, Iterable, Optional, Tuple
|
||
|
|
|
||
|
|
if TYPE_CHECKING:
|
||
|
|
from .core import Connection
|
||
|
|
|
||
|
|
|
||
|
|
class Cursor:
|
||
|
|
def __init__(self, conn: "Connection", cursor: sqlite3.Cursor) -> None:
|
||
|
|
self.iter_chunk_size = conn._iter_chunk_size
|
||
|
|
self._conn = conn
|
||
|
|
self._cursor = cursor
|
||
|
|
|
||
|
|
def __aiter__(self) -> AsyncIterator[sqlite3.Row]:
|
||
|
|
"""The cursor proxy is also an async iterator."""
|
||
|
|
return self._fetch_chunked()
|
||
|
|
|
||
|
|
async def _fetch_chunked(self):
|
||
|
|
while True:
|
||
|
|
rows = await self.fetchmany(self.iter_chunk_size)
|
||
|
|
if not rows:
|
||
|
|
return
|
||
|
|
for row in rows:
|
||
|
|
yield row
|
||
|
|
|
||
|
|
async def _execute(self, fn, *args, **kwargs):
|
||
|
|
"""Execute the given function on the shared connection's thread."""
|
||
|
|
return await self._conn._execute(fn, *args, **kwargs)
|
||
|
|
|
||
|
|
async def execute(self, sql: str, parameters: Iterable[Any] = None) -> "Cursor":
|
||
|
|
"""Execute the given query."""
|
||
|
|
if parameters is None:
|
||
|
|
parameters = []
|
||
|
|
await self._execute(self._cursor.execute, sql, parameters)
|
||
|
|
return self
|
||
|
|
|
||
|
|
async def executemany(
|
||
|
|
self, sql: str, parameters: Iterable[Iterable[Any]]
|
||
|
|
) -> "Cursor":
|
||
|
|
"""Execute the given multiquery."""
|
||
|
|
await self._execute(self._cursor.executemany, sql, parameters)
|
||
|
|
return self
|
||
|
|
|
||
|
|
async def executescript(self, sql_script: str) -> "Cursor":
|
||
|
|
"""Execute a user script."""
|
||
|
|
await self._execute(self._cursor.executescript, sql_script)
|
||
|
|
return self
|
||
|
|
|
||
|
|
async def fetchone(self) -> Optional[sqlite3.Row]:
|
||
|
|
"""Fetch a single row."""
|
||
|
|
return await self._execute(self._cursor.fetchone)
|
||
|
|
|
||
|
|
async def fetchmany(self, size: int = None) -> Iterable[sqlite3.Row]:
|
||
|
|
"""Fetch up to `cursor.arraysize` number of rows."""
|
||
|
|
args: Tuple[int, ...] = ()
|
||
|
|
if size is not None:
|
||
|
|
args = (size,)
|
||
|
|
return await self._execute(self._cursor.fetchmany, *args)
|
||
|
|
|
||
|
|
async def fetchall(self) -> Iterable[sqlite3.Row]:
|
||
|
|
"""Fetch all remaining rows."""
|
||
|
|
return await self._execute(self._cursor.fetchall)
|
||
|
|
|
||
|
|
async def close(self) -> None:
|
||
|
|
"""Close the cursor."""
|
||
|
|
await self._execute(self._cursor.close)
|
||
|
|
|
||
|
|
@property
|
||
|
|
def rowcount(self) -> int:
|
||
|
|
return self._cursor.rowcount
|
||
|
|
|
||
|
|
@property
|
||
|
|
def lastrowid(self) -> int:
|
||
|
|
return self._cursor.lastrowid
|
||
|
|
|
||
|
|
@property
|
||
|
|
def arraysize(self) -> int:
|
||
|
|
return self._cursor.arraysize
|
||
|
|
|
||
|
|
@arraysize.setter
|
||
|
|
def arraysize(self, value: int) -> None:
|
||
|
|
self._cursor.arraysize = value
|
||
|
|
|
||
|
|
@property
|
||
|
|
def description(self) -> Tuple[Tuple]:
|
||
|
|
return self._cursor.description
|
||
|
|
|
||
|
|
@property
|
||
|
|
def connection(self) -> sqlite3.Connection:
|
||
|
|
return self._cursor.connection
|
||
|
|
|
||
|
|
async def __aenter__(self):
|
||
|
|
return self
|
||
|
|
|
||
|
|
async def __aexit__(self, exc_type, exc_val, exc_tb):
|
||
|
|
await self.close()
|