BetterMembership.Extensions.DatabaseExtensions.AddColumnToTable C# (CSharp) 메소드

        public static bool AddColumnToTable(
            this IDatabase db, 
            string userTableName, 
            string userEmailColumn, 
            SqlDbType dataType, 
            int maxEmailLength, 
            bool allowNull, 
            bool isUnique)
        {
            var buffer =
                new StringBuilder(@"ALTER TABLE [").Append(userTableName)
                                                   .Append("] ADD [")
                                                   .Append(userEmailColumn)
                                                   .Append("] ")
                                                   .Append(Convert.ToString(dataType))
                                                   .Append("(")
                                                   .Append(maxEmailLength)
                                                   .Append(")");

            if (allowNull)
            {
                buffer.Append(" NOT");
            }

            buffer.Append(" NULL");

            if (isUnique)
            {
                buffer.Append(" UNIQUE");
            }

            try
            {
                db.Execute(buffer.ToString());
                return true;
            }
            catch (Exception)
            {
                return false;
            }
        }