DBUtils - Python数据库连接池

时间:2021-11-02 02:35:47

flask没有ORM操作这一功能,

但是想要操作数据库怎么办呢,

使用第三方包DBUtils

查询需要SQL原生语句!

DBUtils

第一步还是要下载

使用pycharm直接搜索DBUtils
from DBUtils.PooledDB import PooledDB
import pymysql class MySQLhelper(object):
def __init__(self, host, port, dbuser, password, database):
self.pool = PooledDB(
creator=pymysql, # 使用链接数据库的模块
maxconnections=, # 连接池允许的最大连接数,0和None表示不限制连接数
mincached=, # 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=, # 链接池中最多闲置的链接,0和None不限制
maxshared=,
# 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 ..."]
ping=,
# ping MySQL服务端,检查是否服务可用。# 如: = None = never, = default = whenever it is requested, = when a cursor is created, = when a query is executed, = always
host=host,
port=int(port),
user=dbuser,
password=password,
database=database,
charset='utf8'
) def create_conn_cursor(self):
conn = self.pool.connection()
cursor = conn.cursor(pymysql.cursors.DictCursor)
return conn, cursor def fetch_all(self, sql, args):
conn, cursor = self.create_conn_cursor()
cursor.execute(sql, args)
result = cursor.fetchall()
cursor.close()
conn.close()
return result def insert_one(self, sql, args):
conn, cursor = self.create_conn_cursor()
res = cursor.execute(sql, args)
conn.commit()
conn.close()
return res def update(self, sql, args):
conn, cursor = self.create_conn_cursor()
res = cursor.execute(sql, args)
conn.commit()
print(res)
conn.close()
return res sqlhelper = MySQLhelper("127.0.0.1", , "root", "", "db7") # res = sqlhelper.fetch_all("select * from userinfo where id=%s",(,))
# print(res) # res = sqlhelper.insert_one("insert into userinfo VALUES (%s,%s,%s)",(,"jinwangba",""))
# print(res) # sqlhelper.update("update user SET name=%s WHERE id=%s",("yinwangba",))