Programmer Help

Preface: Recently, I have organized some previous study notes. In the past, it was stored locally, and this time it was transferred to the network for standby. "   MariaDB The brother version of MySQL database was developed by MySQL developers to prevent the source from being closed after MySQL was acquired. Compatible with mysql Soft ...

I took the time to do Sharding jdbc in the past two days. In view of the fact that this part is also used in the current project (not by me), as a slag man who is obsessed with technology, how can he ignore its existence and have to do it by himself? Start up ~ Project building 1. Create a new spring boot project and add dependency <depe ...

I. demand: Use poi to read the national economy industry classification table (excel table made by the National Bureau of Statistics), and insert the data into the established MySQL table. II. Framework: springboot + MyBatisPlus III. test: Use the most basic method to get excel records one by one and p ...

Think.js configuration database Method Preparation Extend model capabilities The Think.js framework does not provide the function of model by default. It needs to load the corresponding extension to support. The corresponding module is think model. Modify the extended configuration file src/config/extend.js, and add the following configurati ...

A dictionary is an unordered collection of data. Usually, the order of output is inconsistent with that of definition 1. Dictionary creation s = {} Create an empty collection d = dict() 2. Initialization of dictionary d = dict(a=1,b=2) d = { 'http':80 'https':443 } 3. Nesting of dictionaries (two-le ...

Get ready First, we go to the maven repository to find the dependency of BoneCP: Add to pom.xml My kafka version is 0.10 spark version is 2.4.2 because it's experimental, so I don't pack it in linux and run it directly on IDEA. Start-up First, I set up a new table Kafka? Test? TBL in the G6 database ...

I. what is Java reflection It is running. It dynamically gets all the information of this class. 1. Function of reflex mechanism - 1, decompile:. Class -- >. Java - 2. Access the properties, methods and construction methods of java objects through reflection mechanism; 2. Application scenario of reflection mechanism Jdbc load driver----- Spr ...

Using annotations to complete IOC and DI   1. Create configuration class SpringConfig.java package com.day02Jdbc.config; import org.springframework.context.annotation.ComponentScan; import org.springframework.context.annotation.Configuration; import org.springframework.context.annotation.Import ...

Today, I made an ajax login and print list with json lightweight data transmission, and I also encountered some problems. First of all, the front and back end problems are cross domain problems. I only used the request permission problem without using other methods. The request header of the servlet ...

Preface Technical point: restful wechat development, payment, subscription and publication, rpc.I don't know when I'm going to stop. Go ahead. 1. Subscription push Message queuing has been implemented in high concurrency detection series. In the same way as publish and subscribe, the real-time function needs cli online service, otherwise it nee ...