eclipse中代码连接到mysql数据库

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class Test {
 
  public static void main(String[] args) throws Exception{
    new Test().add();
  }
  
  
  public static void add() throws Exception{
   String url="jdbc:mysql://127.0.0.1:3306/demo";
    String user="root";
    String password="123";
    
     //加载驱动类
     Class.forName("com.mysql.jdbc.Driver");
     //建立连接
     Connection  coon=DriverManager.getConnection(url, user, password);
     System.out.println(coon);
     //准备sql
     //String sql="INSERT INTO STUDENT(SID,SNAME) VALUES (3,'5')";
     //String sql2="UPDATE STUDENT SET SID=0 WHERE SID=2";
     String sql3="delete from student where sid=0";
     String sql4="select * from student";
     
     //创建执行对象
     Statement s=coon.createStatement();
     //s.executeUpdate(sql);
     //s.executeUpdate(sql2);
     //执行语句
     s.executeUpdate(sql3);//增删改
     ResultSet rs=s.executeQuery(sql4);
     rs.next();//指针控制判断是否有下一行记录,如果有两个next则是第二条记录，有几个就是第几条
     System.out.println(rs.getInt(1));
     System.out.println(rs.getString(2));//rs.getString(2)返回该行的第二个字录，该记录为string类型
     coon.close();
  }
}