myconnection.java

accp s1毕业项目 考试管理系统

package com.exam.db.dao;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.util.Properties;




public class MyConnection {
	private static String driverClass;
	private static String conUrl;
	private static String user;
	private static String password;
	private static boolean isLoad = false;
	
	@SuppressWarnings("unchecked")
	private static void load(Class myclass){
		Properties pp = new Properties();
		File file = new File("dbconnection.properties");
		try {
			pp.load(new FileInputStream(file));
			driverClass = pp.getProperty("driverClass");
			conUrl = pp.getProperty("conUrl");
			user = pp.getProperty("user");
			password = pp.getProperty("password");
			
			Class.forName(driverClass);
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {	
			e.printStackTrace();
		} catch (ClassNotFoundException e) {
			e.printStackTrace();
		}
		isLoad = true;
	}
	
	@SuppressWarnings("unchecked")
	public static Connection getConnection(Class myclass){
		if(!isLoad){
			load(myclass);
		}
		Connection con = null;
		if("sun.jdbc.odbc.JdbcOdbcDriver".equals(driverClass)){
			try {
				con = DriverManager.getConnection(conUrl);
			} catch (SQLException e) {
				e.printStackTrace();
			}
		}else{
			try {
				con = DriverManager.getConnection(conUrl,user,password);
			} catch (SQLException e) {
				e.printStackTrace();
			}
		}
		return con;
	}
	
}