JDBC快速入门

package cn.code.jdbc;

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

import org.junit.Test;

public class NumberOne {
    @Test
    public  void function(){
        //准备四大参数
        //1、驱动类
        String driverclassname = "com.mysql.jdbc.Driver";
        //2、用户名
        String username = "root";
        //3、密码
        String password = "123";
        //4、url
        String url =  "jdbc:mysql://localhost:3306/mydb1";
        try {
            //获取连接
            Connection con = DriverManager.getConnection(url, username, password);
            //获取statement，传输sql语句工具；
            Statement s = con.createStatement();
            //执行sql语句，获取结果集
            ResultSet r = s.executeQuery("Select * from stu");
            System.out.println(r);
        } catch (SQLException e) {
            throw new RuntimeException(e);
        }
    }
}

//针对初学者来说，首先就是准备四大参数，url、驱动类、用户名、密码，其次获取连接Connection，获取执行sql语句类 Statement，执行executeQuery(String sql);方法得到ResultSet;