java-JDBC操作Mysql

package testJdbc;

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

public class test2 {

	
	public static void main(String[] args) throws SQLException, ClassNotFoundException {
		//1、加载驱动器
		String JDBCDriver = "com.mysql.jdbc.Driver";
		Class.forName(JDBCDriver);
		//2、连接数据库
		String url="jdbc:mysql://127.0.0.1:3306/school";  //链接数据的url
		String user="root"; //登录数据库的用户名
		String password="123456"; //用户的密码
		Connection conn = DriverManager.getConnection(url, user, password);
		Statement st = conn.createStatement();
		//一、查询sql
		String sql="select * from student";
	    ResultSet rs = st.executeQuery(sql);
	    
		System.out.println("SId"+" "+"Sname"+" "+"Sage"+" "+"Ssex");
		while (rs.next()) {
			System.out.println(rs.getString("SId")+" "+rs.getString("Sname")+" "+rs.getString("Sage")+" "+rs.getString("Ssex"));
		}
		
		
		/*//二、修改数据
		int update = st.executeUpdate("update student set Sname='xiaolizi' where SId=2");
		System.out.println("修改后成功的条数："+update);
		*/
		
		//三、删除
		//st.execute("delete from student where SId='2'");
		
		
		//四、添加数据
//		String sql1 = "insert into student(SId,Sname,Sage,Ssex) values('4','郑','3','2')";
//		st.execute(sql1);
		
		
		//关闭连接
		conn.close();
		st.close();
		rs.close();
	}
}