Add store split for Get Dashboard version method (#49138)

* Add store split for Get Dashboard version method

* Implement dashboard version service

* Fix api tests

* Remove GetDashboarVersion from sqlstore

* Add fakes for Get dashboard version

* Fix sqlstore test

* Add Get Dashboard store test

* Add dashver service test

* Remove useless comments

pkg/services/dashboardversion/dashverimpl/store.go

@@ -0,0 +1,40 @@
+package dashverimpl
+
+import (
+	"context"
+
+	"github.com/grafana/grafana/pkg/models"
+	dashver "github.com/grafana/grafana/pkg/services/dashboardversion"
+	"github.com/grafana/grafana/pkg/services/sqlstore"
+	"github.com/grafana/grafana/pkg/services/sqlstore/db"
+)
+
+type store interface {
+	Get(ctx context.Context, query *dashver.GetDashboardVersionQuery) (*dashver.DashboardVersion, error)
+}
+
+type sqlStore struct {
+	db db.DB
+}
+
+func (s *sqlStore) Get(ctx context.Context, query *dashver.GetDashboardVersionQuery) (*dashver.DashboardVersion, error) {
+	var version dashver.DashboardVersion
+	err := s.db.WithDbSession(ctx, func(sess *sqlstore.DBSession) error {
+		has, err := sess.Where("dashboard_version.dashboard_id=? AND dashboard_version.version=? AND dashboard.org_id=?", query.DashboardID, query.Version, query.OrgID).
+			Join("LEFT", "dashboard", `dashboard.id = dashboard_version.dashboard_id`).
+			Get(&version)
+
+		if err != nil {
+			return err
+		}
+
+		if !has {
+			return models.ErrDashboardVersionNotFound
+		}
+		return nil
+	})
+	if err != nil {
+		return nil, err
+	}
+	return &version, nil
+}