/// <summary>
        /// The mapping from a database record to data transfer object.
        /// </summary>
        /// <param name="reader">
        /// An instance of the SQL reader.
        /// </param>
        /// <returns>
        /// A deserialized instance of <see cref="CDP4Common.DTO.MultiRelationshipRule"/>.
        /// </returns>
        public virtual CDP4Common.DTO.MultiRelationshipRule MapToDto(NpgsqlDataReader reader)
        {
            string tempModifiedOn;
            string tempName;
            string tempShortName;
            string tempIsDeprecated;
            string tempMinRelated;
            string tempMaxRelated;

            var valueDict      = (Dictionary <string, string>)reader["ValueTypeSet"];
            var iid            = Guid.Parse(reader["Iid"].ToString());
            var revisionNumber = int.Parse(valueDict["RevisionNumber"]);

            var dto = new CDP4Common.DTO.MultiRelationshipRule(iid, revisionNumber);

            dto.ExcludedPerson.AddRange(Array.ConvertAll((string[])reader["ExcludedPerson"], Guid.Parse));
            dto.ExcludedDomain.AddRange(Array.ConvertAll((string[])reader["ExcludedDomain"], Guid.Parse));
            dto.Alias.AddRange(Array.ConvertAll((string[])reader["Alias"], Guid.Parse));
            dto.Definition.AddRange(Array.ConvertAll((string[])reader["Definition"], Guid.Parse));
            dto.HyperLink.AddRange(Array.ConvertAll((string[])reader["HyperLink"], Guid.Parse));
            dto.RelationshipCategory = Guid.Parse(reader["RelationshipCategory"].ToString());
            dto.RelatedCategory.AddRange(Array.ConvertAll((string[])reader["RelatedCategory"], Guid.Parse));

            if (valueDict.TryGetValue("ModifiedOn", out tempModifiedOn))
            {
                dto.ModifiedOn = Utils.ParseUtcDate(tempModifiedOn);
            }

            if (valueDict.TryGetValue("Name", out tempName))
            {
                dto.Name = tempName.UnEscape();
            }

            if (valueDict.TryGetValue("ShortName", out tempShortName))
            {
                dto.ShortName = tempShortName.UnEscape();
            }

            if (valueDict.TryGetValue("IsDeprecated", out tempIsDeprecated))
            {
                dto.IsDeprecated = bool.Parse(tempIsDeprecated);
            }

            if (valueDict.TryGetValue("MinRelated", out tempMinRelated))
            {
                dto.MinRelated = int.Parse(tempMinRelated);
            }

            if (valueDict.TryGetValue("MaxRelated", out tempMaxRelated))
            {
                dto.MaxRelated = int.Parse(tempMaxRelated);
            }

            return(dto);
        }
        /// <summary>
        /// Insert a new database record from the supplied data transfer object.
        /// </summary>
        /// <param name="transaction">
        /// The current <see cref="NpgsqlTransaction"/> to the database.
        /// </param>
        /// <param name="partition">
        /// The database partition (schema) where the requested resource will be stored.
        /// </param>
        /// <param name="multiRelationshipRule">
        /// The multiRelationshipRule DTO that is to be persisted.
        /// </param>
        /// <param name="container">
        /// The container of the DTO to be persisted.
        /// </param>
        /// <returns>
        /// True if the concept was successfully persisted.
        /// </returns>
        public virtual bool Write(NpgsqlTransaction transaction, string partition, CDP4Common.DTO.MultiRelationshipRule multiRelationshipRule, CDP4Common.DTO.Thing container = null)
        {
            bool isHandled;
            var  valueTypeDictionaryAdditions = new Dictionary <string, string>();
            var  beforeWrite = this.BeforeWrite(transaction, partition, multiRelationshipRule, container, out isHandled, valueTypeDictionaryAdditions);

            if (!isHandled)
            {
                beforeWrite = beforeWrite && base.Write(transaction, partition, multiRelationshipRule, container);

                var valueTypeDictionaryContents = new Dictionary <string, string>
                {
                    { "MaxRelated", !this.IsDerived(multiRelationshipRule, "MaxRelated") ? multiRelationshipRule.MaxRelated.ToString() : string.Empty },
                    { "MinRelated", !this.IsDerived(multiRelationshipRule, "MinRelated") ? multiRelationshipRule.MinRelated.ToString() : string.Empty },
                }.Concat(valueTypeDictionaryAdditions).ToDictionary(kvp => kvp.Key, kvp => kvp.Value);

                using (var command = new NpgsqlCommand())
                {
                    var sqlBuilder = new System.Text.StringBuilder();

                    sqlBuilder.AppendFormat("INSERT INTO \"{0}\".\"MultiRelationshipRule\"", partition);
                    sqlBuilder.AppendFormat(" (\"Iid\", \"ValueTypeDictionary\", \"RelationshipCategory\")");
                    sqlBuilder.AppendFormat(" VALUES (:iid, :valueTypeDictionary, :relationshipCategory);");

                    command.Parameters.Add("iid", NpgsqlDbType.Uuid).Value = multiRelationshipRule.Iid;
                    command.Parameters.Add("valueTypeDictionary", NpgsqlDbType.Hstore).Value = valueTypeDictionaryContents;
                    command.Parameters.Add("relationshipCategory", NpgsqlDbType.Uuid).Value  = !this.IsDerived(multiRelationshipRule, "RelationshipCategory") ? multiRelationshipRule.RelationshipCategory : Utils.NullableValue(null);

                    command.CommandText = sqlBuilder.ToString();
                    command.Connection  = transaction.Connection;
                    command.Transaction = transaction;

                    this.ExecuteAndLogCommand(command);
                }
                multiRelationshipRule.RelatedCategory.ForEach(x => this.AddRelatedCategory(transaction, partition, multiRelationshipRule.Iid, x));
            }

            return(this.AfterWrite(beforeWrite, transaction, partition, multiRelationshipRule, container));
        }