Python异步操作MySQL示例【使用aiomysql】
本文实例讲述了Python异步操作MySQL。分享给大家供大家参考，具体如下：
安装aiomysql
依赖
- Python3.4+
- asyncio
- PyMySQL
安装
pip install aiomysql
应用
基本的异步连接connection
import asyncio
from aiomysql import create_pool
loop = asyncio.get_event_loop()
async def go():
async with create_pool(host='127.0.0.1', port=3306,
user='root', password='',
db='mysql', loop=loop) as pool:
async with pool.get() as conn:
async with conn.cursor() as cur:
await cur.execute("SELECT 42;")
value = await cur.fetchone()
print(value)
loop.run_until_complete(go())
异步的连接池 pool
import asyncio
import aiomysql
async def test_example(loop):
pool = await aiomysql.create_pool(host='127.0.0.1', port=3306,
user='root', password='',
db='mysql', loop=loop)
async with pool.acquire() as conn:
async with conn.cursor() as cur:
await cur.execute("SELECT 42;")
print(cur.description)
(r,) = await cur.fetchone()
assert r == 42
pool.close()
await pool.wait_closed()
loop = asyncio.get_event_loop()
loop.run_until_complete(test_example(loop))
对象关系映射SQLAlchemy - Object Relationship Mapping
可以随意定义表结构，轻松调用查询、插入等操作方法。
import asyncio
import sqlalchemy as sa
from aiomysql.sa import create_engine
metadata = sa.MetaData()
tbl = sa.Table('tbl', metadata,
sa.Column('id', sa.Integer, primary_key=True),
sa.Column('val', sa.String(255)))
async def go(loop):
engine = await create_engine(user='root', db='test_pymysql',
host='127.0.0.1', password='', loop=loop)
async with engine.acquire() as conn:
await conn.execute(tbl.insert().values(val='abc'))
await conn.execute(tbl.insert().values(val='xyz'))
async for row in conn.execute(tbl.select()):
print(row.id, row.val)
engine.close()
await engine.wait_closed()
loop = asyncio.get_event_loop()
loop.run_until_complete(go(loop))
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希望本文所述对大家Python程序设计有所帮助。
