用户命令行方式连MYSQL数据库

package cc.openhome;

import java.sql.*;

public class ConnectionDemo {
    public static void main(String[] args) throws ClassNotFoundException, SQLException {
        Class.forName("com.mysql.jdbc.Driver");
        String jdbcUrl = "jdbc:mysql://1.2.3.4:3306/DemoDB";
        String user = "demo";
        String passwd = "demo_pass";
        Connection conn = DriverManager.getConnection(jdbcUrl, user, passwd);
        System.out.printf("Database has %s%n", conn.isClosed()? "closed": "opened");

    }
}
        

D:\learn>javac -cp . -d . ConnectionDemo.java

D:\learn>java  -cp .;mysql-connector-java-5.1.38-bin.jar    cc.openhome.ConnectionDemo