Programmer Think

Backup (mysqldump) Realize the following functions: 1. Back up the specified database 2. Delete the backup file before the specified number of days. 1 day is set by default Script example (mysql_bak.sh) # Database backup root directory BACKUP_DIR="/usr/local/mysqlbackups/tsmbak/" #Specify the host name of the host where mysql resides DB_HOST ...

String correlation functions and methods Correlation functions: len, str, eval 1. Str (data) - convert the specified data into a string (when converting, put quotation marks directly outside the printed value of the data) str(100) #'100' str(True) #'True' list1 = [10,20,30] str(list1) #'[10, 20, 30]' 2. Eval (string) - evaluates th ...

1, When defining variables, add "? After the data typeAdd "? After variable type Represents a nullable value type.For example: int a = null; The above code VS will prompt an error: null cannot be converted to "int" because it is a non nullable value type. However, if it is written in the following format, there will be no ...

Article background: due to network reasons, accessing Github is often unstable. We are going to deploy a set of Gogs service based on Docker in the company to regularly synchronize projects on Github. The company's network environment cannot directly use the original construction process in the gogs project. At the same time, in order to save t ...

"The ancients' knowledge is weak, but their Kung Fu can only be achieved when they are young and old." **The mobile terminal is compatible with the encyclopedia and specializes in treating all kinds of discomfort, * * have you ever been distressed by various incompatibilities of the browser, especially the psoriasis of IE? This arti ...

I study Android in combination with the source code, which is more intuitive and very clear to see the effect. I think it's very good. Today's learning source code is a HealthFood source code found online. Baidu search knows a lot of places to download This study needs to be combined with the previous articles, Layout learning (III) address: h ...

preface I suddenly want to crawl CSDN's columns and save them locally. In order to have less impact, I specially select the front page of CSDN for display.Comprehensive information Where was this test point found? Click the hot article in the figure below, and then jump to the specific article , and then click the column to enter Cut the c ...

Generally, the form page needs to fill in the mobile phone number. To verify whether the mobile phone number entered by the user is correct, we need to use the regular expression to match the mobile phone number segment. If it is in the operator number segment, the number is correct. Therefore, it is necessary to know the latest segment number ...

Article catalogue 1 Preface2 Introduction to development3 data set weibo.json Sina Weibo real-time hot search of the top 50 dataProvinceData. Details of epidemic situation in JSON provinces and cities 4 implementation technology 4.1 system architecture4.2 development environment4.3 epidemic map 4.3.1 choropleth maps4.3.2 bubble char ...

Define spring beans Bean definition in the corresponding code is the configuration meta information interface of beans defined in the Spring Framework, mainly including: Bean's class name, fully qualified name, concrete implementation classBean configuration meta information: scope, Auto Wiring, lifecycle callbackBean References: Collaborator ...