failure.go

package main

import (
        "context"
        "encoding/json"
        "fmt"
        "log"

        "github.com/jmoiron/sqlx"
        _ "github.com/lib/pq"
)

const uri = "postgres://user:pass@localhost:5434/dev?sslmode=disable"

const query = `
select cast (:quote as text)
`

type Embedded struct {
        Quote string
}

func main() {
        var x = struct {
                Embedded
                Quote string `db:"quote"`
        }{
                Embedded: Embedded{Quote: "original"},
                Quote:    "override",
        }

        v, _ := json.Marshal(x)
        log.Println(string(v))

        dbx, err := sqlx.Open("postgres", uri)
        if err != nil {
                panic(err)
        }

        stmt, err := dbx.PrepareNamed(query)
        if err != nil {
                panic(err)
        }

        var res string
        err = stmt.GetContext(context.Background(), &res, x)
        if err != nil {
                log.Println(err)
        }
        fmt.Println(res)
}

gistfile1.txt

09:18:02 $ go run test.go
2017/07/10 09:18:03 {"Quote":"override"}
original