Python異步操作MySQL示例【使用aiomysql】

更新時間：2019年05月16日 08:36:49 作者：Moxiao__墨簫

這篇文章主要介紹了Python異步操作MySQL,結(jié)合實例形式分析了Python安裝及使用aiomysql針對mysql數(shù)據(jù)庫異步操作相關(guān)實現(xiàn)技巧,需要的朋友可以參考下

本文實例講述了Python異步操作MySQL。分享給大家供大家參考，具體如下：

安裝aiomysql

依賴

Python3.4+
asyncio
PyMySQL

安裝

pip install aiomysql

應(yīng)用

基本的異步連接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())

異步的連接池 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))

對象關(guān)系映射SQLAlchemy - Object Relationship Mapping

可以隨意定義表結(jié)構(gòu)，輕松調(diào)用查詢、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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希望本文所述對大家Python程序設(shè)計有所幫助。

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