使用DBCP建立的连接池。（直接使用在应用程序用）

lovajava_ye — Tue, 28 Aug 2007 01:47:00 GMT

由于在JAVA自动获得新闻，没有建立web的环境，将建立的服务器放置在一台服务器上，数据库放在另一台服务器上，结果造成使用JDBC速度缓慢，因此修改成连接池：

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;

import org.apache.commons.dbcp.ConnectionFactory;
import org.apache.commons.dbcp.DriverManagerConnectionFactory;
import org.apache.commons.dbcp.PoolableConnectionFactory;
import org.apache.commons.dbcp.PoolingDriver;
import org.apache.commons.pool.ObjectPool;
import org.apache.commons.pool.impl.GenericObjectPool;
import org.apache.log4j.Logger;

/**
* @author Administrator
*
*/
public class DBConnectionFactory {
/**
* Logger for this class
*/
private static final Logger logger = Logger
.getLogger(DBConnectionFactory.class);

private static ObjectPool connectionPool=null;
private static String sqlJdbc = "";
    private static String sqlUser = "";
    private static String sqlPwd = "";
    @SuppressWarnings("unchecked")
private static Class driverClass=null;

    public static void proDBConnectionFactory(){
    if(sqlJdbc.equals("")){
      sqlJdbc = "jdbc:jtds:sqlserver://27.0.0.1:1433/finance;tds=8.0;lastupdatecount=true";
    }
    if(sqlUser.equals("")){
      sqlUser = "sa";
    }
    if(sqlPwd.equals("")){
      sqlPwd = "11111";
    }
    initDataSource();
    }
     public synchronized static void initDataSource(){
    if(driverClass == null){
       try {
    driverClass = Class.forName("net.sourceforge.jtds.jdbc.Driver");
   } catch (ClassNotFoundException e) {
    logger.error("在注册驱动名称的时间发生错误："+e.getMessage(),e);
   }
    }
    if(connectionPool == null){
       setupDriver(sqlJdbc);
       //printDriverStats();
    }else{
       System.out.print("连接池已经存在");
    }
    try {
            // printDriverStats();
         } catch (Exception e) {
             e.printStackTrace();
         }
     }

     public static Connection getConn(){
    proDBConnectionFactory();
    Connection conn = null;
    try {
             conn = DriverManager.getConnection("jdbc:apache:commons:dbcp:FinanceDBPool");
         } catch(SQLException e) {
             e.printStackTrace();
         }
         return conn;

     }

     public static void printDriverStats() throws Exception {
         PoolingDriver driver = (PoolingDriver) DriverManager.getDriver("jdbc:apache:commons:dbcp:");
         ObjectPool connectionPool = driver.getConnectionPool("FinanceDBPool");
         System.out.println("活动的连接: " + connectionPool.getNumActive());
         System.out.println("空闲的连接: " + connectionPool.getNumIdle());
     }

     public static void setupDriver(String connectURI){
    try {
   connectionPool = new GenericObjectPool(null);
    ConnectionFactory connectionFactory = new DriverManagerConnectionFactory(connectURI,sqlUser,sqlPwd);
    @SuppressWarnings("unused")
   PoolableConnectionFactory poolableConnectionFactory = new PoolableConnectionFactory(connectionFactory,connectionPool,null,null,false,true);
    Class.forName("org.apache.commons.dbcp.PoolingDriver");
    PoolingDriver driver = (PoolingDriver) DriverManager.getDriver("jdbc:apache:commons:dbcp:");
    //driver.registerPool("FinanceDBPool",connectionPool);
    driver.registerPool("FinanceDBPool",connectionPool);

  } catch (ClassNotFoundException e) {
   logger.error("注册连接池的时间发生错误:"+e.getMessage(),e);
  } catch (SQLException e) {
   logger.error("注册连接池的时间发生错误:"+e.getMessage(),e);
  }
     }

lovajava_ye 2007-08-28 09:47 发表评论

这段时间开始研究hibernate，开始了解最新的hibernate技术（问题一）Hibernate的No CurrentSessionContext configured 解决方案

lovajava_ye — Thu, 10 May 2007 05:19:00 GMT

今天按照满江红翻译的hibernate文档来做第一个简单的程序，却出现No CurrentSessionContext configured 问题。在google上搜索，却发现是
是由于没有配置：current_session_context_class
在hibernate的配置文件中增加thread
原因：当你使用 Hibernate session factory的getCurrentSession() 函数时候，你可能见到过"No CurrentSessionContext configured!"

出现这个问题，是因为你没有正确配置 Hibernate internal session context management .

lovajava_ye 2007-05-10 13:19 发表评论

BlogJava-叶明的javablog-随笔分类-hibernate

使用DBCP建立的连接池。（直接使用在应用程序用）

这段时间开始研究hibernate，开始了解最新的hibernate技术（问题一）Hibernate的No CurrentSessionContext configured 解决方案