public override IList <DatabaseColumn> IdentityColumns(string tableName)
        {
            var dt = _schemaReader.IdentityColumns(tableName);

            return(SchemaConstraintConverter.ConvertIdentity(dt));
        }
        public IList <DatabaseTable> Load(CancellationToken ct)
        {
            if (ct.IsCancellationRequested)
            {
                return(EmptyList());
            }
            RaiseReadingProgress(SchemaObjectType.Tables);

            //get full datatables for all tables, to minimize database calls
            var tabs = _schemaReader.Tables();

            //we either use the converters directly (DataTable to our db model)
            //or loaders, which wrap the schema loader calls and converters
            //loaders hide the switch between calling for all tables, or a specific table
            if (ct.IsCancellationRequested)
            {
                return(EmptyList());
            }
            RaiseReadingProgress(SchemaObjectType.Columns);
            var columnLoader = new ColumnLoader(_schemaReader);

            if (ct.IsCancellationRequested)
            {
                return(EmptyList());
            }
            RaiseReadingProgress(SchemaObjectType.Constraints);
            var constraintLoader = new SchemaConstraintLoader(_schemaReader);
            var indexLoader      = new IndexLoader(_schemaReader);

            var ids       = _schemaReader.IdentityColumns(null);
            var computeds = _schemaReader.ComputedColumns(null);

            if (ct.IsCancellationRequested)
            {
                return(EmptyList());
            }
            RaiseReadingProgress(SchemaObjectType.Descriptions);
            var tableDescriptions  = new TableDescriptionConverter(_schemaReader.TableDescription(null));
            var columnDescriptions = new ColumnDescriptionConverter(_schemaReader.ColumnDescription(null));

            DataTable triggers         = _schemaReader.Triggers(null);
            var       triggerConverter = new TriggerConverter(triggers);

            if (ct.IsCancellationRequested)
            {
                return(EmptyList());
            }
            ReaderEventArgs.RaiseEvent(ReaderProgress, this, ProgressType.Processing, SchemaObjectType.Tables);
            var tables      = SchemaConverter.Tables(tabs);
            var tableFilter = _exclusions.TableFilter;

            if (tableFilter != null)
            {
                tables.RemoveAll(t => tableFilter.Exclude(t.Name));
            }
            tables.Sort(delegate(DatabaseTable t1, DatabaseTable t2)
            {
                //doesn't account for mixed schemas
                return(string.Compare(t1.Name, t2.Name, StringComparison.OrdinalIgnoreCase));
            });

            int tablesCount = tables.Count;

            for (var i = 0; i < tablesCount; i++)
            {
                var table      = tables[i];
                var tableName  = table.Name;
                var schemaName = table.SchemaOwner;

                if (ct.IsCancellationRequested)
                {
                    return(tables);
                }
                ReaderEventArgs.RaiseEvent(ReaderProgress, this, ProgressType.Processing, SchemaObjectType.Tables, tableName, i, tablesCount);
                table.Description = tableDescriptions.FindDescription(table.SchemaOwner, tableName);

                var databaseColumns = columnLoader.Load(tableName, schemaName);
                table.Columns.AddRange(databaseColumns);

                columnDescriptions.AddDescriptions(table);

                var pkConstraints = constraintLoader.Load(tableName, schemaName, ConstraintType.PrimaryKey);
                PrimaryKeyLogic.AddPrimaryKey(table, pkConstraints);

                var fks = constraintLoader.Load(tableName, schemaName, ConstraintType.ForeignKey);
                table.AddConstraints(fks);

                table.AddConstraints(constraintLoader.Load(tableName, schemaName, ConstraintType.UniqueKey));
                table.AddConstraints(constraintLoader.Load(tableName, schemaName, ConstraintType.Check));
                table.AddConstraints(constraintLoader.Load(tableName, schemaName, ConstraintType.Default));

                indexLoader.AddIndexes(table);

                SchemaConstraintConverter.AddIdentity(ids, table);
                SchemaConstraintConverter.AddComputed(computeds, table);

                table.Triggers.Clear();
                table.Triggers.AddRange(triggerConverter.Triggers(tableName));
                _schemaReader.PostProcessing(table);
            }
            return(tables);
        }