安装
pip install dbutils -i https://pypi.douban.com/simple
# 数据库连接池
# -*- coding: utf-8 -*-
import pymysql
from dbutils.pooleddb import pooleddb
pool = pooleddb(
creator=pymysql, # 使用链接数据库的模块
maxconnections=6, # 连接池允许的最大连接数,0和none表示不限制连接数
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
maxcached=5, # 链接池中最多闲置的链接,0和none不限制
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。
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
maxusage=none, # 一个链接最多被重复使用的次数,none表示无限制
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
ping=0,
# ping mysql服务端,检查是否服务可用。
# 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}]
# 关闭
cur.close()
conn.close()
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)))
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