Programmer Group

I. Development of Dao layer 1. Develop dao interface public interface ProductCategoryDao { /** * Query the commodity category of the shop through the shop id * @param shopId * @return List<ProductCategory> */ List<ProductCategory> queryProductCategoryList(long shopId); } 2. Develop dao implementation class ...

background We are responsible for a business platform. Once we found that the loading of the settings page was particularly slow, which was just outrageous It is impossible for users to wait for 36s, so we are going to start the optimization journey. Throw a stone to clear the road Since it is the response of the website, we can use Chrome as ...

Asynchronous download of national flag picture and country name data import aiohttp import asyncio import os import time import sys POP20_CC = ('CN IN US ID BR PK NG BD RU JP MX PH VN ET EG DE IR CD FR').split() BASE_URL = 'http://flupy.org/data/flags' DEST_DIR = 'downloads/' class FetchError(Exception): #Used to catch exceptions def __i ...

zabbix Sends WeChat Alerts with Pictures 2.1 Realization Ideas 2.2 Preparing the environment The script uses python scripts, running in python 2.7.5 Dependent libraries are installed in advance: requests 2.3 ×××tid，secret This section allows you to see a detailed description of the previous article without a diagram 2.4 Script Implementati ...

(I) storage strategy <1> database You can add skin fields to the database user table for access. If the user table is not convenient for adding fields, you can add an intermediate table to store user and skin information.< 2 > read write configuration Users and skin information can be stored by reading an ...

First, introduce the basic knowledge used formdata Definition on MDN: the FormData interface provides a way to construct key value pairs that represent form data. After that, the data can be sent out using the XMLHttpRequest.send() method.In short, it is the parameter used to construct http request (it can carry file data). Common methods:FormD ...

Catalog 1. Skip execution of test cases 1.1. @pytest.mark.skip decorator 1.2. pytest.skip method 1.3. @pytest.mark.skipif decorator 1.4. pytest.importorskip method 1.5. Skip test class 1.6. Skip test module 1.7. Skip specified file or directory 1.8. summary ...

The first is a two-tier network, using the numpy version and the python version In fact, if you compare carefully, the difference is not big. The amount of code is similar. Because there is no automatic gradient calculation using pytorch. numpy version # -*- coding: utf-8 -*- import numpy as np # N is batch size; ...

Understanding SPA Modern front-end projects are mostly single page Web applications (SPA), in which the path is an important part.SPA is the abbreviation of single page web application, which is translated into single page web application. In short, SPA is a WEB project with only one HTML page. Once the page is loaded, SPA will not reload or ...

SQL MODE is a system variable in MySQL, which can be composed of multiple modes. Each MODE controls a behavior, such as whether to allow the divisor to be 0, and whether to allow the value of '0000-00-00' in the date. Why should we pay attention to SQL mode? First, look at three simple demos (MySQL 5.6). 1. mysql> create table t1(c1 da ...