studentms/DBHelper.java

package com.WR.StudentMS.dao.mysql;

import java.io.IOException;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.Properties;

public class DBHelper {
	static String url;
	static Properties info = new Properties();
	static {
		InputStream input = DBHelper.class.getClassLoader().getResourceAsStream("config.properties");
		try {
			info.load(input);
			url = info.getProperty("url");
			String driverClassName = info.getProperty("driver");
			Class.forName(driverClassName);
			System.out.println("驱动加载成功");
		}catch(ClassNotFoundException e) {
			System.out.println("驱动加载失败");
		}catch(IOException e) {
			System.out.println("属性文件加载失败");
		}
	}
	public static Connection getConnection() throws SQLException {
		Connection conn = DriverManager.getConnection(url,info);
		return conn;
	}
	public static void close(ResultSet rs,PreparedStatement pstmt,Connection conn ) throws SQLException {

		if (rs != null) {
			try {
				rs.close();
			} catch (SQLException e) {
				e.printStackTrace();			
			}
		}
		if (pstmt != null) {
			try {
				pstmt.close();
			} catch (SQLException e) {
				e.printStackTrace();		
			}
		}
		if (conn != null) {
			try {
				conn.close();
			} catch (SQLException e) {
				e.printStackTrace();		
			}
		}
	}

}