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package main
import (
"database/sql"
"database/sql/driver"
"encoding/json"
"errors"
"log"
"os"
_ "golite"
)
type Tag struct {
Name string `json:"name"`
Place string `json:"place"`
}
func (t *Tag) Scan(value interface{}) error {
return json.Unmarshal([]byte(value.(string)), t)
}
func (t *Tag) Value() (driver.Value, error) {
b, err := json.Marshal(t)
return string(b), err
}
func main() {
os.Remove("json.db")
defer os.Remove("json.db")
db, err := sql.Open("sqlite3", "json.db")
if err != nil {
log.Fatal(err)
}
defer db.Close()
_, err = db.Exec(`create table myjsontable (tag jsonb)`)
if err != nil {
log.Fatal(err)
}
stmt, err := db.Prepare("insert into myjsontable(tag) values(?)")
if err != nil {
log.Fatal(err)
}
defer stmt.Close()
_, err = stmt.Exec(`{"name": "name1", "place": "right-here"}`)
if err != nil {
log.Fatal(err)
}
_, err = stmt.Exec(`{"name": "michael", "place": "usa"}`)
if err != nil {
log.Fatal(err)
}
var place string
err = db.QueryRow("select tag->>'place' from myjsontable where tag->>'name' = 'name1'").Scan(&place)
if err != nil {
log.Fatal(err)
}
if place != "right-here" {
log.Fatal(errors.New("expected right-here, got: " + place))
}
var tag Tag
err = db.QueryRow("select tag from myjsontable where tag->>'name' = 'name1'").Scan(&tag)
if err != nil {
log.Fatal(err)
}
if tag.Name != "name1" {
log.Fatal(errors.New("expected name1, got: " + tag.Name))
}
if tag.Place != "right-here" {
log.Fatal(errors.New("expected right-here, got: " + tag.Place))
}
tag.Place = "日本"
_, err = db.Exec(`update myjsontable set tag = ? where tag->>'name' == 'name1'`, &tag)
if err != nil {
log.Fatal(err)
}
err = db.QueryRow("select tag->>'place' from myjsontable where tag->>'name' = 'name1'").Scan(&place)
if err != nil {
log.Fatal(err)
}
if place != "日本" {
log.Fatal(errors.New("expected 日本, got: " + place))
}
}
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