# cat sql_helper.py
import pymysqlimport threadingfrom DBUtils.PooledDB import PooledDB, SharedDBConnectionPOOL = PooledDB( creator=pymysql, # 使用链接数据库的模块 maxconnections=20, # 连接池允许的大连接数,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,表示不创建 maxcached=5, # 链接池中多闲置的链接,和None不限制 #maxshared=3, # 链接池中多共享的链接数量,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,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, 1 = default = whenever it is requested, 2 = when a cursor is created, 4 = when a query is executed, 7 = always host='192.168.11.38', port=3306, user='root', passwd='apNXgF6RDitFtDQx', db='m2day03db', charset='utf8')
def connect(): # 创建连接 # conn = pymysql.connect(host='192.168.11.38', port=3306, user='root', passwd='apNXgF6RDitFtDQx', db='m2day03db') conn = POOL.connection() # 创建游标 cursor = conn.cursor(pymysql.cursors.DictCursor)
return conn,cursor
def close(conn,cursor): # 关闭游标 cursor.close() # 关闭连接 conn.close()
def fetch_one(sql,args): conn,cursor = connect() # 执行SQL,并返回收影响行数 effect_row = cursor.execute(sql,args) result = cursor.fetchone() close(conn,cursor)
return result
def fetch_all(sql,args): conn, cursor = connect()
# 执行SQL,并返回收影响行数 cursor.execute(sql,args) result = cursor.fetchall()
close(conn, cursor) return result
def insert(sql,args): """ 创建数据 :param sql: 含有占位符的SQL :return: """ conn, cursor = connect()
# 执行SQL,并返回收影响行数 effect_row = cursor.execute(sql,args) conn.commit()
close(conn, cursor)
def delete(sql,args): """ 创建数据 :param sql: 含有占位符的SQL :return: """ conn, cursor = connect()
# 执行SQL,并返回收影响行数 effect_row = cursor.execute(sql,args)
conn.commit()
close(conn, cursor)
return effect_row
def update(sql,args): conn, cursor = connect()
# 执行SQL,并返回收影响行数 effect_row = cursor.execute(sql, args)
conn.commit()
close(conn, cursor)
return effect_row