加载驱动

//        加载驱动
        Class.forName("com.mysql.cj.jdbc.Driver");

获取连接

//        获取连接
        String url = "jdbc:mysql://127.0.0.1:3306/book";
        String username = "root" ;
        String password = "root" ;
        Connection conn = DriverManager.getConnection(url,username,password);

创建会话

//      创建会话
        Statement sta = conn.createStatement();

发送SQL

//      发送SQL语句
        ResultSet res = sta.executeQuery("select * from t_book");

处理结果

//        处理结果
        while (res.next()){
            System.out.println(res.getInt("id") + "--" + res.getString("name") + "--" + res.getString("author") + "--" + res.getDouble("price"));
        }

关闭资源

//      关闭资源
        sta.close();
        conn.close();

测试

import java.sql.*;

public class Test01 {
    public static void main(String[] args) throws ClassNotFoundException, SQLException {
//        加载驱动
        Class.forName("com.mysql.cj.jdbc.Driver");
//        获取连接
        String url = "jdbc:mysql://127.0.0.1:3306/book";
        String username = "root" ;
        String password = "root" ;
        Connection conn = DriverManager.getConnection(url,username,password);
//      创建会话
        Statement sta = conn.createStatement();
//      发送SQL语句
        ResultSet res = sta.executeQuery("select * from t_book");
//        处理结果
        while (res.next()){
            System.out.println(res.getInt("id") + "--" + res.getString("name") + "--" + res.getString("author") + "--" + res.getDouble("price"));
        }

//      关闭资源
        sta.close();
        conn.close();
    }
}