Programmer Group

brief introduction Gorm is one of the more ORM s used in the development of the Go language.It has a full range of functions: crud Association (contains one, contains many, belongs to, many-to-many, contains many) callback functions are available before and after CallBacks (create, save, update, delete, query find) Preload affair composite pri ...

Compared with the previous section, go language access to MySql database can be better written, today we will talk about connection pooling. At the same time, it also demonstrates the processing of go language when the table field content is NULL. First, we build a new database, cofoxdb and data table user. Added Administrator Switch tab S ...

Note: Mindoc is an online interface document editing system, Baidu will know it in a moment.GitHub address: https://github.com/lifei6671/mindoc Native machine: ubuntu16.04 + dockerCE2017.12 + mysql5.7 + git2.7.4 Since mirroring with dockerfile requires jumping to the Goldang.org website, you know it.I built it using a foreign VPS 1 git clone co ...

In golang, the function of inheritance and override is realized by combination. Perhaps most of us usually use the writing of anonymous struct in struct. Have you ever seen the writing of anonymous interface in struct? Interface is an interface that is directly an anonymous segment in struct and is written in the standard library sort package a ...

In the second half of 2018, the block chain industry is gradually fading away from the impetuosity and rationality at the beginning of its development. On the surface, it seems that the demand and status of relevant talents are declining. But in fact, it is the gradual decline of the initial bubble that gives people more attention to the real t ...

I have always felt the shortcomings of the blog, but recently I found it difficult to find a blog I wrote before when it grew up. As a back-end developer, the owner felt he had enough clothes and clothes to eat, so he had the full-text search function of the blog, Elasticsearch, and thanks to a server sponsored by Phigo. Selection of Full Text ...

concept The first thing Socket does is translate it into a hole or socket. Two programs on the network exchange data through a two-way communication connection, one end of which is called a socket.The essence of Socket is programming interface, which is an IPC interface. (IPC: Inter-process communication) Unlike other IPC methods, it allows mul ...

1. Introduction of TF-IDF algorithm TF-IDF (term frequency-inverse document frequency) is a commonly used weighting technology for information retrieval and text mining. TF-IDF is a statistical method used to assess the importance of a word to a document set or one of the documents in a corpus. The importance of words increases with the numbe ...

brief introduction The go standard library bufio.Scanner is literally a scanner and scanner. The data soldier cache is continuously read from a reader, and an injection function is provided to customize the partitioner. Four predefined segmentation methods are also provided in the library. ScanLines: Separated by newline characters ('n') Sca ...

It is very important to implement distributed optimistic locking. If the lock is out of order suddenly, the lock needs to be released automatically. So it takes a lifetime to lock it in an etcd.Overdue demonstration: package main import ( "context" "fmt" "go.etcd.io/etcd/clientv3" "time" ) func main() { var ( conf ...