堆栈跟踪和golang错误。Unwrap（）

Question

I would like to build a stack trace that includes a low level db error with a second error which is human readable.

Is the new errors.Unwrap() function in golang 1.13 built for this purpose? Not sure I understand how to use it. Looking for an example on how to do this.

// model/book.go
package model

type Book struct {
    Id     uint32  `json:"id"     db:"id"`
    Title  string  `json:"title"  db:"title"`
    Author string  `json:"author" db:"author"`
    Price  float32 `json:"price"  db:"price"`
}

func (b *Book) Tablename() string {
    return "books"
}


// main.go
package main

func main() {
    bk := model.Book{
        Title:  "oliver twist",
        Author: "charles dickens",
        Price:  10.99,
    }

    err:= Create(&bk)
    if err !=nil {
        // how to use Unwrap?
    }

}
func Create(book *model.Book) error {
    insertSQL := "INSERT INTO ...."
    // code to insert
    if err != nil {
        return err
    }
    book.Id = uint32(lastID)
    return nil
}