src/com/util/DBO.java

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package com.util;

import java.sql.*;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;

import javax.activation.DataSource;
import java.sql.*;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import javax.naming.Context;
import javax.naming.InitialContext;

public class DBO {

	private Connection conn;
	private Statement stmt;
  	private DataSource ds;
	
	public DBO()
	{
	}

	/**
		打开数据库
	*/
	public void open() 
	{
		try 
		{
			Class.forName("com.mysql.jdbc.Driver"); 
			conn=DriverManager.getConnection("jdbc:mysql://localhost/jj","root","root");
			//Class.forName("com.microsoft.jdbc.sqlserver.SQLServerDriver");           
			//conn = DriverManager.getConnection("jdbc:microsoft:sqlserver://localhost:1433;databasename=xswz","sa","123");
			stmt=conn.createStatement();
			System.out.println("打开数据库连接");
		} 
		catch (Exception ex) 
		{
		System.err.println("打开数据库时出错: " + ex.getMessage());
		}
	}

	/**
		关闭数据库，将连接返还给连接池
	*/
	public void close() 
	{
		try 
		{
		
				
		//	connMgr.freeConnection("java", conn);
			conn.close();
			System.out.println ("释放连接");
		} 
		catch (SQLException ex)