大家好,我是考100分的小小码 ,祝大家学习进步,加薪顺利呀。今天说一说数据连接_数据连接电脑,希望您对编程的造诣更进一步.
Pymysql
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安装
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pip install PyMySQL
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# -*- coding: utf-8 -*-
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import pymysql
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conn = pymysql.connect(host=“192.168.32.71”, user=“root”,password=“redhat”,database=“my_sql”,charset=“utf8”)
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cursor = conn.cursor(cursor=pymysql.cursors.DictCursor)
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sql = “select * from name”
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res = cursor.execute(sql)
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print(cursor.fetchall())
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# [{“name”: “peach”, “id”: 1, “age”: 25}, {“name”: “taoiz”, “id”: 2, “age”: 23}]
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cursor.close()
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conn.close()
数据库连接池DBUtils
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安装
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pip install DBUtils -i https://pypi.douban.com/simple
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# 数据库连接池
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# -*- coding: utf-8 -*-
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import pymysql
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from DBUtils.PooledDB import PooledDB
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POOL = PooledDB(
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creator=pymysql, # 使用链接数据库的模块
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maxconnections=6, # 连接池允许的最大连接数,0和None表示不限制连接数
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mincached=2, # 初始化时,链接池中至少创建的空闲的链接,0表示不创建
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maxcached=5, # 链接池中最多闲置的链接,0和None不限制
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maxshared=3, # 链接池中最多共享的链接数量,0和None表示全部共享。PS: 无用,因为pymysql和MySQLdb等模块的 threadsafety都为1,所有值无论设置为多少,_maxcached永远为0,所以永远是所有链接都共享。
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blocking=True, # 连接池中如果没有可用连接后,是否阻塞等待。True,等待;False,不等待然后报错
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maxusage=None, # 一个链接最多被重复使用的次数,None表示无限制
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setsession=[], # 开始会话前执行的命令列表。如:[“set datestyle to …”, “set time zone …”] 比如设置数据库的开始时间 set firstday=3
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ping=0,
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# ping MySQL服务端,检查是否服务可用。
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# 如:0 = None = never,
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# 1 = default = whenever it is requested,
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# 2 = when a cursor is created,
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# 4 = when a query is executed,
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# 7 = always
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host=“192.168.32.71”,
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port=3306,
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user=“root”,
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password=“redhat”,
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charset=“utf8”,
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db=“my_sql”
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)
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# 使用
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conn = POOL.connection() # pymysql – conn
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cur = conn.cursor(cursor=pymysql.cursors.DictCursor)
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res = cur.execute(“select * from name”)
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print(cur.fetchall())
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# [{“name”: “peach”, “id”: 1, “age”: 25}, {“name”: “taoiz”, “id”: 2, “age”: 23}]
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# 关闭
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cur.close()
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conn.close()
自己封装的sqlhelper
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from dbpool import POOL
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import pymysql
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def create_conn():
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conn = POOL.connection()
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cursor = conn.cursor(cursor=pymysql.cursors.DictCursor)
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return conn,cursor
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def close_conn(conn,cursor):
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cursor.close()
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conn.close()
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def insert(sql,args):
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conn,cursor = create_conn()
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res = cursor.execute(sql,args)
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conn.commit()
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close_conn(conn,cursor)
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return res
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def fetch_one(sql,args):
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conn,cursor = create_conn()
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cursor.execute(sql,args)
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res = cursor.fetchone()
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close_conn(conn,cursor)
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return res
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def fetch_all(sql,args):
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conn,cursor = create_conn()
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cursor.execute(sql,args)
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res = cursor.fetchall()
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close_conn(conn,cursor)
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return res
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# sql = “insert into users(name,age) VALUES (%s, %s)”
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# insert(sql,(“mjj”,9))
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sql = “select * from users where name=%s and age=%s”
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print(fetch_one(sql,(“mjj”,9)))
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