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