Programming VIP

Timing analysis 26 Preliminary study on time series prediction Prophet package preface In the previous articles in this series, we introduced a variety of time series prediction techniques and models. We can see that the time series prediction technology is still very complex and the steps are cumbersome. Readers may remember that VAR model ...

MyBatis multi table operation Multi table query means that when the query returns the result, it cannot automatically match the number. We will manually seal a Map for it and manually Map the data manually. The following two tables are used as examples orders table: users table: example: one to one query. One order corresponds to one use ...

Link: https://pan.baidu.com/s/1HR3Q-cojnCidRy1xrdlOxg Extraction code: 7m56 --Sharing from Baidu online disk super member V3 Deploy other microservices The registry eureka service configuration specifies the production server address The service gateway configuration specifies the production server address For the configuration of the certifi ...

Multi file programming: in the process of writing code, it is impossible to put all the code into one file. Here, the code executed by the game, the declared function and the implementation of the function are written separately, which can improve the readability of the code, facilitate the modification of the code, reduce coupling, improve the ...

Database query optimization orm statement features: lazy query If it's just writing orm Statement. If the parameters queried by the statement are not used later, then orm It will be recognized automatically and will not be executed give an example: res = models.Book.objects.all() # Executing this statement alone, Django will not use the databa ...

The last article summarized Type annotation for TypeScript , let's talk about equally important functions and classes function The following declares a function type. The type alias is defined by type. void indicates that there is no return value type fnType = () => void; As a parameter A function can be passed as an argument to another fun ...

What is expression language (EL)? Expression language (EL) is a mechanism that simplifies storage in Java  Accessibility of data in Bean components and other objects (such as requests, sessions, applications, etc.). There are many operators in JSP that are used in EL, such as arithmetic operators and logical operators to execute expressions. I ...

#Using Redis to optimize login module Redis is used to optimize the functions with high access frequency that will affect efficiency Use Redis to store verification code [the transfer of external chain pictures fails, and the source station may have anti-theft chain mechanism. It is recommended to save the pictures and upload them d ...

top command usagetop command is often used to monitor the system status of linux. It is a common performance analysis tool, which can display the resource occupation of each process in the system in real time. How to use top top [-d number] | top [-bnp] Parameter interpretation: -d: Number represents the number of seconds and represents the int ...

Step 1: download the source code package from github And put opencv and opencv contrib in the same directory At the same time, create a new build folder in this directory mkdir build Step 2: install dependency #Installation tools sudo apt-get install cmake cmake-qt-gui git unzip #Installation dependency sudo apt-get install build-esse ...