resin+oracle

最新推荐文章于 2021-09-30 15:56:39 发布

ZHENJIANWEI

最新推荐文章于 2021-09-30 15:56:39 发布

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CC 4.0 BY-SA版权

文章标签： exception import string null properties oracle

本文链接：https://blog.youkuaiyun.com/ZHENJIANWEI/article/details/1630799

本文介绍了一个Java数据库连接池(DBPool)的实现方法，通过使用JNDI查找数据源，支持从配置文件读取数据源信息，实现了获取和释放数据库连接的功能。

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package com.zhen.database;
import com.zhen.util.*;

import java.io.InputStream;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Properties;

import javax.naming.InitialContext;
import javax.sql.DataSource;

public class DBPool{

private static DBPool instance=null;
private Connection con=null;

private DataSource ds=null;

public DBPool()throws Exception
{
  //从属性文件中读取数据源名称
  InputStream in = getClass().getClassLoader().getResourceAsStream(
  "dataSource.properties");

        Properties prop = new Properties();
        prop.load(in);

        String name = prop.getProperty("DataSourceName");

        InitialContext ctx = new InitialContext();

ds = (DataSource) ctx.lookup("java:comp/env/"+name);
//InitialContext ctx=new InitialContext();

        //ds=(DataSource)ctx.lookup("java:comp/env/jdbc/ds");
}

public synchronized static DBPool getInstance()
{
  try
  {
   if(instance==null)
   {
    instance=new DBPool();
   }
    return instance;
  }
  catch(Exception e)
  {
   e.printStackTrace();
   return null;
  }
}

    public Connection getConnection(String name,Connection conn)throws SQLException
{
  con=ds.getConnection();
  return con;
}

public void freeConnection(String name,Connection con) {
   try
   {
    if(con!=null)
    {
     con.close();
    }
   }
   catch(SQLException e)
   {
    e.printStackTrace();
   }

}

public Connection getConnection()throws Exception
{
  con=ds.getConnection();
  return con;
  /*try
  {
   String Driver="com.mysql.jdbc.Driver";
   String url="jdbc:mysql://localhost/uc";
   Class.forName(Driver);
   Connection con=DriverManager.getConnection(url,"root","root");
   return con;
  }
  catch(Exception e)
  {
   e.printStackTrace();
   return null;
  }*/
  /*try
  {
   String serverName="localhost";

   String driver="oracle.jdbc.driver.OracleDriver";

   String sConnStr="jdbc:oracle:thin:@"+serverName+":1521:oracle";

   Class.forName(driver);

   Connection con=DriverManager.getConnection(sConnStr,"scott","tiger");

   return con;
  }
  catch(SQLException e)
  {
   e.printStackTrace();
   throw e;
  }*/

}

public void CloseConenction(Connection con)
{
  try
  {
   if(con!=null)
   {
    con.close();
   }
  }
  catch(SQLException e)
  {
   e.printStackTrace();
  }
}

public void CloseAllConnection()
{
  try
  {
   if(con!=null)
   {
    con.close();
   }
  }
  catch(Exception e)
  {
   System.out.println(e.getMessage());
  }
}

}