import java.sql.Connection;import java.sql.DriverManager;import java.sql.ResultSet;import java.sql.Statement;public class test {	public static void main(String[] args) {			System.out.println("aaa");		try {		String url = "jdbc:mysql://localhost:3306/demo1?"              + "user=root&password=root&useUnicode=true&characterEncoding=UTF8";			Class.forName("com.mysql.jdbc.Driver");					Connection con=	DriverManager.getConnection(url);//			创建查询			Statement st=con.createStatement();//			添加数据			String sqlAdd="insert into student(sname,spass) values(‘掌柜的‘,‘1236547‘)";			int add=st.executeUpdate(sqlAdd);			if(add!=0)			{				System.out.println("添加数据成功！");			}//			删除数据			String sqlDel="delete from student where sid=2";			int del=st.executeUpdate(sqlDel);			if(del!=0)			{				System.out.println("删除成功！");			}//		更新数据		String sqlUpdate="update student set sname=‘战鹰‘ where sname=‘wanghu‘";		int a=	st.executeUpdate(sqlUpdate);//		判断是否更新成功		if(a!=0)		{			System.out.println("修改成功");		}//		查询结果		String sqlSelect="select * from student";			ResultSet rs=	st.executeQuery(sqlSelect);			while(rs.next())			{				int id=rs.getInt("sid");				String name=rs.getString("sname");				String pass=rs.getString("spass");				System.out.println("id="+id+",  name="+name+", pass="+pass);			}		} catch (Exception e) {			e.printStackTrace();			System.out.println(e.getMessage());		}	}}