JAVA 基础 JDBC（Java DataBase Connection）封装简单JDBC工具类

• 封装工具类
  

package demo1;

import java.sql.Connection;
import java.sql.DriverManager;

public class JDBCutilDemo {

	private static final String DRIVERNAME = "com.mysql.jdbc.Driver";
	private static final String URL = "jdbc:mysql://localhost:3306/day29";
	private static final String USERNAME = "root";
	private static final String PASSWORD = "Aa123456";
	
	static {
		//静态代码块中的代码在使用类的时候就会调用
		try {
			//注册驱动
			Class.forName(DRIVERNAME);
		} catch (ClassNotFoundException e) {
			System.out.println("注册驱动失败!");
		}
	}
	
	public static Connection getConn() throws Exception {
		/*
		 * 返回数据库链接
		 */
		Connection conn = DriverManager.getConnection(URL,USERNAME,PASSWORD);
		return conn;
	}
	
	
	
	
}
package demo1;

import