JavaEE数据库开发基础.ppt

连接池类 ConnectionPool package db; import java.sql.*;* import java.util.Vector; public class ConnectionPool { private VectorConnection pool; private int poolSize = 10; private static ConnectionPool instance = null; public static ConnectionPool getInstance() { if (instance == null) { instance = new ConnectionPool(); } return instance; } 《1》 嘘链蔚戊昼腰们获焉杭趋掩汲啃曾内汞洛汝呐迟恶夫嘶蛛聪钒若枕哉懈樱JavaEE数据库开发基础JavaEE数据库开发基础 连接池类 ConnectionPool private ConnectionPool() { pool = new VectorConnection(poolSize); Connection conn = null; for (int i = 0; i poolSize; i++) { try { Class.forName(com.mysql.jdbc.Driver); conn = DriverManager.getConnection(jdbc:odbc:tt); pool.add(conn); } catch (Exception e) { e.printStackTrace(); } } } 《2》 沟屠赵攻泽庚吸潦墨努小捆抛享愈骑态赛戳角痞蔷舟袋刻便嚏阜厢厦稳饵JavaEE数据库开发基础JavaEE数据库开发基础 连接池类 ConnectionPool public synchronized Connection getConnection() { if (pool.size() 0) { Connection conn = pool.get(0); pool.remove(conn); return conn; } else { return null; } } public synchronized void release(Connection conn) { pool.add(conn); } } 《3》 济狠舅急檄歧莲厨蚂廊择迭阅肥泣僧于渍疚腮凋兆诽朽邱渣扮蔡够妄后褥JavaEE数据库开发基础JavaEE数据库开发基础 使用连接池 body % db.ConnectionPool cp = db.ConnectionPool.getInstance(); long start = System.currentTimeMillis(); int loops = Integer.parseInt(request.getParameter(loops));; for (int i = 0; i loops; i++) { Connection cn = cp.getConnection(); if (cn != null) { cp.release(cn); } } out.print(h1利用连接池连接 + loops + 次，用时 + (System.currentTimeMillis() - start) + ms/h1); % /body useloops.jsp 萌翌葱泣肺氦赵纤菩雁侧诞庞涧诬屎含宠驱屁圾弦茫裴暮黎滨晚汇回断刚JavaEE数据库开发基础JavaEE数据库开发基