pool= PooledDB(pymysql, 5, **db_config)#5为连接池里的最少连接数conn= pool.connection()#以后每次需要数据库连接就是用connection()函数获取连接就好了cur =conn.cursor() SQL="select * from rbac_menu;"#执行sql语句res =cur.execute(SQL)#查询所有符合条件的数据ret =cur.fetchall()print(ret) c...
public class ConnectionPoolUtils { private ConnectionPoolUtils(){};//私有静态方法 private static ConnectionPool poolInstance = null; public static ConnectionPool GetPoolInstance(){ if(poolInstance == null) { poolInstance = new ConnectionPool( "com.mysql.jdbc.Driver", "jdbc:mysql://localhost:3306...
ConnectionPool::~ConnectionPool() { while(!m_connectionQ.empty()) { MysqlConn *conn = m_connectionQ.front(); m_connectionQ.pop(); delete conn; } } //对外接口,获取线程池 ConnectionPool* ConnectionPool::getConnectPool() { static ConnectionPool pool; return &pool; } //获取线程池中的连...
importjava.sql.Connection;importjava.sql.DriverManager;importjava.sql.SQLException;publicclassConnectionPoolExample{publicstaticvoidmain(String[]args){Stringurl="jdbc:mysql://localhost:3306/mydatabase";Stringusername="root";Stringpassword="password";try{Connectionconnection=DriverManager.getConnection(url,userna...
importmysql.connectorfrommysql.connectorimportErrorfromqueueimportQueueclassMySQLConnectionPool:def__init__(self,pool_size,**db_config):self.pool_size=pool_size self.pool=Queue(maxsize=pool_size)self.db_config=db_config self.initialize_pool()definitialize_pool(self):for_inrange(self.pool_size):c...
// log_info("new db connection: %s, conn_cnt: %d\n", m_pool_name.c_str(), m_db_cur_conn_cnt); } } } CDBConn *pConn = m_free_list.front(); // 获取连接 m_free_list.pop_front(); // STL 吐出连接,从空闲队列删除
使用poolConnection关闭的MySQL连接是指在使用连接池管理MySQL连接时,通过调用poolConnection方法来关闭连接。连接池是一种用于提高数据库连接性能和资源利用率的技术,它通过预先创建一定数量的数据库连接并将其保存在连接池中,当应用程序需要访问数据库时,可以从连接池中获取一个空闲的连接,使用完毕后再将连接放回连接池...
连接池(Connection Pool):这是C3P0的核心,包含一组预先创建的数据库连接。应用程序从连接池中获取连接,使用完后归还给连接池 连接测试器(Connection Tester):用于定期检测连接池中的连接是否有效,无效的连接会被移除并建立新的连接 配置管理器(Configuration Manager):提供了一系列参数用于配置数据源和连接池,如最大/...
If your driver supports JDBC4 we strongly recommend not setting this property. This is for "legacy" drivers that do not support the JDBC4 Connection.isValid() API. This is the query that will be executed just before a connection is gi...