I hate to dig up something from 2012, but I have come across a similar issue where I can use an explanation. The signature of the Query function in the sql package is:
func (db *DB <https://golang.org/pkg/database/sql/#DB>) Query(query string <https://golang.org/pkg/builtin/#string>, args ...interface{}) (*Rows <https://golang.org/pkg/database/sql/#Rows>, error <https://golang.org/pkg/builtin/#error>) so, one would assume that passing something like this for args would work (Active is bool and Role is a string: var cond = []interface{}{exchData.Active, exchData.Role} but it does not, it results in this error: sql: converting argument $1 type: unsupported type []interface {}, a slice of interface I suspect there is a good explanation for this that I do not get. On Friday, September 7, 2012 at 4:45:07 PM UTC-4, Paddy Foran wrote: > > Consider the following: > > In package fmt: func Println(a …interface{}) > > One would think the following code would work: > > func main() { > testslice := []string { "this", "is", "a", "test" } > fmt.Println(testslice…) > } > > One would subsequently be met with "cannot use testslice (type []string) > as type []interface {} in function argument" ( > http://play.golang.org/p/H3349TDJnS) > > On the other hand, if one were to try: > > func print(words …string) { > for _, word := range words { > fmt.Printf("%s", word) > } > } > > func main() { > testslice := []string { "this", "is", "a", "test" } > print(testslice…) > } > > Everything works as expected (http://play.golang.org/p/1ZnIwge19V). Can > anyone explain why the empty interface in variadic parameters prevents me > from using argument expansion? > > God, I hope I used the right names for all these things. > -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/golang-nuts/1cc28db0-98c6-49cd-bd3e-7752ef2b5328%40googlegroups.com.
