Python异步操作MySQL示例

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。