self._connections=0#Establish an initial number of idle database connections:idle = [self.dedicated_connection()foriinrange(mincached)]whileidle: idle.pop().close()defsteady_connection(self):"""Get a steady, unpooled DB-API 2 connection."""returnconnect( self._creator, self._maxusage, s...
def release_connection(self, connection): pass def close_pool(self): pass 包括初始化、获取连接、释放连接、关闭连接四个方法。 第三步,实现连接池初始化 def __init__(self, pool_size, host, user, password, database, port, charset): self.lock = threading.Lock() self.queue = [] self.pool...
pool = PooledDB(pgdb,5, database='mydb')### 设置连接池后,可以从该池请求数据库连接:db = pool.connection()### 设置非零maxshared参数, 默认情况下连接可能会与其他线程共享。如果您想拥有专用连接db = pool.connection(shareable=False) ↓ db = pool.dedicated_connection()# 专用连接### 如果您不...
connection objects or a DB-API 2 compliant database module mincached: initial number of idle connections in the pool (0 means no connections are made at startup) maxcached: maximum number of idle connections in the pool (0 or None means unlimited pool size) maxshared: maximum number of sh...
importpymysqlfromDBUtils.PersistentDBimportPersistentDB# 创建数据库连接db_config={'host':'localhost','port':3306,'user':'root','password':'123456','database':'test','charset':'utf8mb4'}db_pool=PersistentDB(pymysql,**db_config)# 从连接池中获取连接conn=db_pool.connection()# 创建游标对象...
SimpleConnectionPool( 1, 10, f"dbname={database} user={user} password={password} host={host} port={port}" ) class ConnectionFromPool: def __init__(self, connection_pool): self.connection_pool = connection_pool self.conn = None def __enter__(self): self.conn = self.connection_pool...
def get_connection(self): pass def release_connection(self, connection): pass def close_pool(self): pass 包括初始化、获取连接、释放连接、关闭连接四个方法。 第三步,实现连接池初始化 def __init__(self, pool_size, host, user, password, database, port, charset): ...
db_connection = pool.connect(database="mydatabase") 代码语言:txt 复制 *注意:您可以根据需要将数据库连接作为一个属性存储在其他类中以便多次重用,然后关闭连接。 从池中提取连接并使用它执行操作。在执行完毕后,将连接返回到池中,以供其他操作使用。 代码语言:python 代码运行次数:0 复制Cloud Studio ...
engine=create_engine('sqlite:///my_database.db',pool_size=10) 使用方法也比较简单 : 代码语言:javascript 代码运行次数:0 运行 AI代码解释 from sqlalchemyimportcreate_engine,text engine=create_engine('sqlite:///my_database.db',pool_size=10)defconcurrent_access():withengine.connect()asconn:result...
connection = pymysql.connect( host='localhost', port=3306, user='username', password='password', database='database_name' D. 执行数据库操作 连接成功后,我们可以执行各种数据库操作,如查询数据、插入数据、更新数据和删除数据等。 查询数据