简单的数据库连接示例

public class SimpleDBDemo {

    public static void main(String[] args) {

        try {
            // 加载数据库驱动  com.mysql.cj.jdbc.Driver
            String strDriver = "com.mysql.cj.jdbc.Driver";
            // 获取mysql连接地址
            String strURL = "jdbc:mysql://localhost:3306/mytest?&useSSL=false&serverTimezone=UTC";
            // 用户名称
            String username = "root";
            // 用户密码
            String password = "123456";

            Class.forName(strDriver);
            System.out.println("SQLServerDriver success");

            // 获取一个数据的连接，连接MySql数据库
            Connection con = DriverManager.getConnection(strURL, username, password);
            System.out.println("Connection success");

            // 创建statement类对象，用来执行SQL语句！
            Statement stm = con.createStatement();

            // 要执行的SQL语句
            String strSql = "select * from student";

            // ResultSet类，用来存放获取的结果集！
            ResultSet rs = stm.executeQuery(strSql);

            while(rs.next()){

                String s1 = rs.getString(1);
                String s2 = rs.getString(2);
                double d3 = rs.getDouble(3);
                System.out.println(s1+"t"+s2+"tt"+d3);
            }

            rs.close();
            stm.close();
            con.close();

        } catch (ClassNotFoundException | SQLException e) {
            e.printStackTrace();
        }
    }
}