How Can I Efficiently Unmarshal CSV Data into Go Structs?

Unmarshal CSV Records into Go Structs

In Go, there's a common need to deserialize CSV records into custom structures. While the "encoding/csv" package provides basic CSV reading, it requires manual parsing and conversion into structs. Fortunately, there are alternative solutions that simplify this process.

One such solution is gocarina/gocsv, which follows the same approach as the "encoding/json" package for handling custom structs. It also allows for custom marshalling and unmarshalling for specific types.

Consider the example:

type Client struct {
    Id      string `csv:"client_id"`
    Name    string `csv:"client_name"`
    Age     string `csv:"client_age"`
}

func main() {
    in, err := os.Open("clients.csv")
    if err != nil {
        panic(err)
    }
    defer in.Close()

    clients := []*Client{}

    if err := gocsv.UnmarshalFile(in, &clients); err != nil {
        panic(err)
    }
    for _, client := range clients {
        fmt.Println("Hello, ", client.Name)
    }
}

Here, gocsv.UnmarshalFile directly populates the clients slice with deserialized Client structs. This simplifies the unmarshalling process, making it more intuitive and convenient than using standard "encoding/csv" methods.

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