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main.go
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main.go
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package main
import (
"context"
"database/sql"
"fmt"
"github.com/uptrace/bun"
"github.com/uptrace/bun/dialect/sqlitedialect"
"github.com/uptrace/bun/driver/sqliteshim"
"github.com/uptrace/bun/extra/bundebug"
)
type Profile struct {
ID int64
Lang string
}
// User has one profile.
type User struct {
ID int64
Name string
ProfileID int64
Profile *Profile `bun:"rel:belongs-to"`
}
func main() {
ctx := context.Background()
sqldb, err := sql.Open(sqliteshim.ShimName, "file::memory:?cache=shared")
if err != nil {
panic(err)
}
db := bun.NewDB(sqldb, sqlitedialect.New())
defer db.Close()
db.AddQueryHook(bundebug.NewQueryHook(bundebug.WithVerbose()))
if err := createSchema(ctx, db); err != nil {
panic(err)
}
var users []User
if err := db.NewSelect().
Model(&users).
Column("user.*").
Relation("Profile").
Scan(ctx); err != nil {
panic(err)
}
fmt.Println(len(users), "results")
fmt.Println(users[0].ID, users[0].Name, users[0].Profile)
fmt.Println(users[1].ID, users[1].Name, users[1].Profile)
// Output: 2 results
// 1 user 1 &{1 en}
// 2 user 2 &{2 ru}
}
func createSchema(ctx context.Context, db *bun.DB) error {
models := []interface{}{
(*User)(nil),
(*Profile)(nil),
}
for _, model := range models {
if _, err := db.NewCreateTable().Model(model).Exec(ctx); err != nil {
return err
}
}
profiles := []*Profile{
{ID: 1, Lang: "en"},
{ID: 2, Lang: "ru"},
}
if _, err := db.NewInsert().Model(&profiles).Exec(ctx); err != nil {
return err
}
users := []*User{
{ID: 1, Name: "user 1", ProfileID: 1},
{ID: 2, Name: "user 2", ProfileID: 2},
}
if _, err := db.NewInsert().Model(&users).Exec(ctx); err != nil {
return err
}
return nil
}