How to use the dbutils.Branch.fromId function in DBUtils

progress.write("  reachable contains missing commits")
        except KeyboardInterrupt: sys.exit(1)
        except:
            progress.write("WARNING[%s]: %s missing!" % (repository.name, branch_name))

            if branch_type == "normal":
                cursor.execute("SELECT id FROM branches WHERE base=%s", (branch_id,))

                sub_branches = cursor.fetchall()
                if sub_branches:
                    progress.write("  branch has sub-branches")

                    base_branch = dbutils.Branch.fromId(db, branch_base_id)

                    for (sub_branch_id,) in sub_branches:
                        sub_branch = dbutils.Branch.fromId(db, sub_branch_id)
                        sub_branch.rebase(db, base_branch)
                        progress.write("    rebased sub-branch %s" % sub_branch.name)

                try:
                    if force:
                        cursor.execute("DELETE FROM branches WHERE id=%s", (branch_id,))
                        db.commit()
                    progress.write("  deleted from database")
                except KeyboardInterrupt: sys.exit(1)
                except:
                    progress.write("  failed to delete from database")
                    db.rollback()
            else:
                try: review_id = getReview(branch_id)
                except KeyboardInterrupt: sys.exit(1)
                except:

if profiler: profiler.check("Branch.fromId: basic")

            repository = gitutils.Repository.fromId(db, repository_id)

            if profiler: profiler.check("Branch.fromId: repository")

            if load_commits:
                try: head_commit = gitutils.Commit.fromId(db, repository, head_commit_id)
                except: head_commit = None

                if profiler: profiler.check("Branch.fromId: head")
            else:
                head_commit = None

            if load_commits:
                base_branch = Branch.fromId(db, base_branch_id) if base_branch_id is not None else None

                if profiler: profiler.check("Branch.fromId: base")

                tail_commit = gitutils.Commit.fromId(db, repository, tail_commit_id) if tail_commit_id is not None else None

                if profiler: profiler.check("Branch.fromId: tail")
            else:
                base_branch = None
                tail_commit = None

            branch = Branch(branch_id, repository, branch_name, head_commit, base_branch, tail_commit, type, review_id)

            if has_review and load_review:
                branch.review = Review.fromBranch(db, branch)

                if profiler: profiler.check("Branch.fromId: review")