JAVA_JBDC（基础数据库连接）

import java.sql.*;

public class JDBC {


    public static void main(String[] args) throws ClassNotFoundException, SQLException {
        //1.注册驱动
        Class.forName("com.mysql.cj.jdbc.Driver");

        //2.获取连接
        String url="jdbc:mysql://localhost:3306/db_school";
        String  uername="root";
        String password="123456";
        Connection connection = DriverManager.getConnection(url,uername,password);

        //3.定义sql语句
        String sql = "SELECT * FROM sc";

        //4.获取执行sql的对象Statement
        Statement statement = connection.createStatement();

        //5.执行sql
        ResultSet count=statement.executeQuery(sql);
        //受影响的行数

        //6.处理结果
        System.out.println(count);

        //7.释放资源
        statement.close();
        connection.close();

    }
}