Pymysql 安裝 pipinstallPyMySQL #-*-coding:utf-8-*- importpymysql conn=pymysql.connect(host="192.168.32.71",user="root",password="redhat",database="my_sq... ...
Pymysql
- 安裝
- pip install PyMySQL
- # -*- coding: utf-8 -*-
- import pymysql
- conn = pymysql.connect(host="192.168.32.71", user="root",password="redhat",database="my_sql",charset="utf8")
- cursor = conn.cursor(cursor=pymysql.cursors.DictCursor)
- sql = "select * from name"
- res = cursor.execute(sql)
- print(cursor.fetchall())
- # [{'name': 'peach', 'id': 1, 'age': 25}, {'name': 'taoiz', 'id': 2, 'age': 23}]
- cursor.close()
- conn.close()
資料庫連接池DBUtils
- 安裝
- pip install DBUtils -i https://pypi.douban.com/simple
- # 資料庫連接池
- # -*- coding: utf-8 -*-
- import pymysql
- from DBUtils.PooledDB import PooledDB
- POOL = PooledDB(
- creator=pymysql, # 使用鏈接資料庫的模塊
- maxconnections=6, # 連接池允許的最大連接數,0和None表示不限制連接數
- mincached=2, # 初始化時,鏈接池中至少創建的空閑的鏈接,0表示不創建
- maxcached=5, # 鏈接池中最多閑置的鏈接,0和None不限制
- maxshared=3, # 鏈接池中最多共用的鏈接數量,0和None表示全部共用。PS: 無用,因為pymysql和MySQLdb等模塊的 threadsafety都為1,所有值無論設置為多少,_maxcached永遠為0,所以永遠是所有鏈接都共用。
- blocking=True, # 連接池中如果沒有可用連接後,是否阻塞等待。True,等待;False,不等待然後報錯
- maxusage=None, # 一個鏈接最多被重覆使用的次數,None表示無限制
- setsession=[], # 開始會話前執行的命令列表。如:["set datestyle to ...", "set time zone ..."] 比如設置資料庫的開始時間 set firstday=3
- ping=0,
- # ping MySQL服務端,檢查是否服務可用。
- # 如:0 = None = never,
- # 1 = default = whenever it is requested,
- # 2 = when a cursor is created,
- # 4 = when a query is executed,
- # 7 = always
- host="192.168.32.71",
- port=3306,
- user="root",
- password="redhat",
- charset="utf8",
- db="my_sql"
- )
- # 使用
- conn = POOL.connection() # pymysql - conn
- cur = conn.cursor(cursor=pymysql.cursors.DictCursor)
- res = cur.execute("select * from name")
- print(cur.fetchall())
- # [{'name': 'peach', 'id': 1, 'age': 25}, {'name': 'taoiz', 'id': 2, 'age': 23}]
- # 關閉
- cur.close()
- conn.close()
自己封裝的sqlhelper
- from dbpool import POOL
- import pymysql
- def create_conn():
- conn = POOL.connection()
- cursor = conn.cursor(cursor=pymysql.cursors.DictCursor)
- return conn,cursor
- def close_conn(conn,cursor):
- cursor.close()
- conn.close()
- def insert(sql,args):
- conn,cursor = create_conn()
- res = cursor.execute(sql,args)
- conn.commit()
- close_conn(conn,cursor)
- return res
- def fetch_one(sql,args):
- conn,cursor = create_conn()
- cursor.execute(sql,args)
- res = cursor.fetchone()
- close_conn(conn,cursor)
- return res
- def fetch_all(sql,args):
- conn,cursor = create_conn()
- cursor.execute(sql,args)
- res = cursor.fetchall()
- close_conn(conn,cursor)
- return res
- # sql = "insert into users(name,age) VALUES (%s, %s)"
- # insert(sql,("mjj",9))
- sql = "select * from users where name=%s and age=%s"
- print(fetch_one(sql,("mjj",9)))