1、創建數據庫連接對象

Connection connection=DriverManager.getConnection("jdbc:mysql://localhost:3306/database","root","12345");

2、創建Statement對象

Statement statement=connection.createStatement();

3、執行sql語句,返回ResultSet對象

ResultSet result=statement.executeQuery("select * from user");

4、關閉數據庫連接

connection.close();