Advertisements I’m trying to insert some data into a Database with Go. Due to the nature of the data (large export from another tool), I hit sometimes some of my models constraints. With the following Go code _, err := db.Exec(query, params…) if err != nil { log.Print(err) } I simply get an output like… Read More How can I get error details for a SQL Insert done in Go?

Advertisements I create a new type to add custom methods specific for my app’s needs type Content html.Node I know I can derivate a html.Node from a content var of type Content doing this node := html.Node(content) But, having a var of type html.Node, how can I convert to a Content ? I discovered that… Read More How can I convert a type to a new one based on it?

Advertisements When using goroutine, I want to avoid blocking caused by program timeout. (e.g. file reading) Can you give me some sample code. Thanks a lot! >Solution : If I understand you correctly, here are the code you want: go func() { for { select { case num := <-ch: //If there is data, it… Read More How Golang implements the timeout mechanism

Advertisements Everything is working except that I would like to retry only on Timeout errors, but I dont know how to compare with the specific Client.Timeout error that is generated. The missing part is in comment here: if errors.Is(err, colly.Client.Timeout)…: package main import ( "crypto/tls" "fmt" "github.com/gocolly/colly" "net/http" "os" "strings" ) func main() { crawl()… Read More Colly Go package: how to check if the error is a Timeout error?

Advertisements for i := 0; i < 5; i++ { fmt.Println("i is", i) for j := 0; j < 3; j++ { if j == 2 { break } fmt.Println("j is ", j) } } I want this code to break the program if the i was equal to 2. how can I signal that… Read More how to break the outer loop within the inner loop

Advertisements I’m willing to create C++ STL in Go. Is there a way to create custom structs that implement bracket syntax for index accessing? Assume this is my array type: type Array[T any] struct { values []T } Is there any way I can add bracket syntax indexation instead of Array.At() or any other? I… Read More Bracket syntax for custom struct types in Go

Advertisements I am pretty new to Go and I am trying to find the best way to set up my db communication. Essentially I remember from my previous workplaces that in PHP you can create a class that represents a SQL table and when you need to insert data into your db you would create… Read More Go structs that represent SQL tables

Advertisements I was reading through the Tour of Go and tried to write a small program to check my understanding of channels and select. I was expecting the code snippet below to count down: "5, 4, 3, 2, 1, Blastoff!" However, the program just hangs after "1". Can someone explain what I’m doing wrong? package… Read More Using channels for a countdown in Go

Advertisements I need to format a Date.Time object which is a UTC string into the following format “dd/mm/yyyy HH:MM:SS”. I need to loop through an array of transactions and alter the StatusDateTime for each transaction in the array. I’ve tried the below while playing around with the format, but it does not alter the date… Read More Date format in Golang

Advertisements For Go 1.16, ioutil.ReadAll / ioutil.ReadFile / ioutil.ReadDir are deprecated. any new pakcages to use ? >Solution : ioutil.ReadAll -> io.ReadAll ioutil.ReadFile -> os.ReadFile ioutil.ReadDir -> os.ReadDir // others ioutil.NopCloser -> io.NopCloser ioutil.ReadDir -> os.ReadDir ioutil.TempDir -> os.MkdirTemp ioutil.TempFile -> os.CreateTemp ioutil.WriteFile -> os.WriteFile