[Workaround] doctor xorm.Count nil on sqlite error (#11741)

* make it similar to v1.12&master

* workaround from xorm bug

* CI.restart()

cmd/doctor.go

 }
 
 func runDoctorCheckDBConsistency(ctx *cli.Context) ([]string, error) {
+	var results []string
+
 	// make sure DB version is uptodate
 	if err := models.NewEngine(context.Background(), migrations.EnsureUpToDate); err != nil {
 		return nil, fmt.Errorf("model version on the database does not match the current Gitea version. Model consistency will not be checked until the database is upgraded")
 	}
-	_, committer, err := models.TxDBContext()
-	if err != nil {
-		return nil, err
-	}
-	sess := committer.(models.Engine)
-	defer committer.Close()
-	var results []string
 
 	//find tracked times without existing issues/pulls
-	count, err := sess.Table("tracked_time").
-		Join("LEFT", "issue", "tracked_time.issue_id=issue.id").
-		Where("issue.id is NULL").
-		Count("id")
+	count, err := models.CountOrphanedObjects("tracked_time", "issue", "tracked_time.issue_id=issue.id")
 	if err != nil {
 		return nil, err
 	}
 	if count > 0 {
 		if ctx.Bool("fix") {
-			if _, err = sess.In("id", builder.Select("tracked_time.id").
-				From("tracked_time").
-				Join("LEFT", "issue", "tracked_time.issue_id=issue.id").
-				Where(builder.IsNull{"issue.id"})).
-				Delete(models.TrackedTime{}); err != nil {
+			if err = models.DeleteOrphanedObjects("tracked_time", "issue", "tracked_time.issue_id=issue.id"); err != nil {
 				return nil, err
 			}
 			results = append(results, fmt.Sprintf("%d tracked times without existing issue deleted", count))
 		}
 	}
 
-	if ctx.Bool("fix") {
-		return results, committer.Commit()
-	}
 	return results, nil
 }

models/consistency.go

 	"testing"
 
 	"github.com/stretchr/testify/assert"
+	"xorm.io/builder"
 )
 
 // consistencyCheckable a type that can be tested for database consistency
 	repo := AssertExistsAndLoadBean(t, &Repository{ID: action.RepoID}).(*Repository)
 	assert.Equal(t, repo.IsPrivate, action.IsPrivate, "action: %+v", action)
 }
+
+// CountOrphanedObjects count subjects with have no existing refobject anymore
+func CountOrphanedObjects(subject, refobject, joinCond string) (int64, error) {
+	var ids []int64
+
+	return int64(len(ids)), x.Table("`"+subject+"`").
+		Join("LEFT", refobject, joinCond).
+		Where(builder.IsNull{"`" + refobject + "`.id"}).
+		Select("id").Find(&ids)
+}
+
+// DeleteOrphanedObjects delete subjects with have no existing refobject anymore
+func DeleteOrphanedObjects(subject, refobject, joinCond string) error {
+	_, err := x.In("id", builder.Select("`"+subject+"`.id").
+		From("`"+subject+"`").
+		Join("LEFT", "`"+refobject+"`", joinCond).
+		Where(builder.IsNull{"`" + refobject + "`.id"})).
+		Delete("`" + subject + "`")
+	return err
+}