import pymysql
import threading
from DBUtils.PooledDB import PooledDB
"""
storage = {
1111:{'stack':[]}
}
"""
class SqlHelper(object):
def __init__(self):
self.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链接,0表示不创建
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
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='127.0.0.1',
port=3306,
user='root',
password='222',
database='cmdb',
charset='utf8'
)
self.local = threading.local()
def open(self):
conn = self.pool.connection()
cursor = conn.cursor()
return conn, cursor
def close(self, cursor, conn):
cursor.close()
conn.close()
def fetchall(self, sql, *args):
""" 获取所有数据 """
conn, cursor = self.open()
cursor.execute(sql, args)
result = cursor.fetchall()
self.close(conn, cursor)
return result
def fetchone(self, sql, *args):
""" 获取所有数据 """
conn, cursor = self.open()
cursor.execute(sql, args)
result = cursor.fetchone()
self.close(conn, cursor)
return result
def __enter__(self):
conn,cursor = self.open()
rv = getattr(self.local,'stack',None)
if not rv:
self.local.stack = [(conn,cursor),]
else:
rv.append((conn,cursor))
self.local.stack = rv
return cursor
def __exit__(self, exc_type, exc_val, exc_tb):
rv = getattr(self.local,'stack',None)
if not rv:
# del self.local.stack
return
conn,cursor = self.local.stack.pop()
cursor.close()
conn.close()
db = SqlHelper()
Database connection pool sqlhelper
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Origin www.cnblogs.com/ciquankun/p/12033265.html
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