operation.java~6~

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package dsp.database;

/**
 * <p>Title: DSP实验室</p>
 * <p>Description: DSP教学网
 *                 数据库的相关操作：如连接、查询、添加、删除、修改、分页显示
 * </p>
 * <p>Copyright: Copyright (c) 2004</p>
 * <p>Company: </p>
 * @author 李艳生
 * @version 1.0
 */

import java.sql.*;
import java.io.*;
import java.util.*;

public class Operation {
    //数据库驱动程序
	private String strDriver = "";
	//数据库连接字符串
	private String strURL = "";
	//数据库用户名
	private String username = "";
	//数据库密码
	private String password = "";

	private Connection conn = null;
	private Statement stmt = null;
	ResultSet rs = null;

	/** 读到数据库配置信息
		 */
	private void loadProp(){
		InputStream is = getClass().getResourceAsStream("/setup.txt");
		Properties props = new Properties();

		try{
			props.load(is);
		}catch(Exception e){
			System.err.println("不能读取配置文件. 请确保setup.txt在classes指定的路径中");
		}

		Enumeration propNames = props.propertyNames();
		while (propNames.hasMoreElements()) {
			String name = (String) propNames.nextElement();
			if (name.endsWith(".driver")) {
				String poolName = name.substring(0, name.lastIndexOf("."));
				strDriver = props.getProperty(poolName + ".driver");
				strURL = props.getProperty(poolName + ".url");
				username = props.getProperty(poolName + ".user");
				password = props.getProperty(poolName + ".password");
			}
		}
	}

	/** 在创建Operation对象时连接数据库
	 */
	public Operation() {
		//读到数据库配置信息
		loadProp();

		try{
			Class.forName(strDriver);
		}catch(java.lang.ClassNotFoundException e) {
			System.err.println("数据库连接错误：" + e.getMessage());
		}

		try{
			conn=DriverManager.getConnection(strURL,username,password);
		}catch(SQLException ex) {
			System.err.println("数据库连接错误：" + ex.getMessage());
		}

	}
}