コード例 #1
0
        /// <summary>
        /// Rename a collection (do not support transactions)
        /// </summary>
        public bool RenameCollection(string collection, string newName)
        {
            if (collection.IsNullOrWhiteSpace())
            {
                throw new ArgumentNullException(nameof(collection));
            }
            if (newName.IsNullOrWhiteSpace())
            {
                throw new ArgumentNullException(nameof(newName));
            }

            // rename collection is possible only in exclusive transaction for this
            if (_locker.IsInTransaction)
            {
                throw LiteException.AlreadyExistsTransaction();
            }

            // check for collection name
            if (collection.Equals(newName, StringComparison.OrdinalIgnoreCase))
            {
                throw LiteException.InvalidCollectionName(newName, "New name must be different from current name");
            }

            // checks if newName are compatible
            CollectionService.CheckName(newName, _header);

            // rename collection is possible only in exclusive transaction for this
            if (_locker.IsInTransaction)
            {
                throw LiteException.AlreadyExistsTransaction();
            }

            return(this.AutoTransaction(transaction =>
            {
                var currentSnapshot = transaction.CreateSnapshot(LockMode.Write, collection, false);
                var newSnapshot = transaction.CreateSnapshot(LockMode.Write, newName, false);

                if (currentSnapshot.CollectionPage == null)
                {
                    return false;
                }

                // checks if do not already exists this collection name
                if (_header.GetCollectionPageID(newName) != uint.MaxValue)
                {
                    throw LiteException.AlreadyExistsCollectionName(newName);
                }

                // rename collection and set page as dirty (there is no need to set IsDirty in HeaderPage)
                transaction.Pages.Commit += (h) =>
                {
                    h.RenameCollection(collection, newName);
                };

                return true;
            }));
        }