RowDescription (#15)

* init

* upd

Author: danylo-safonov-solid

example/lib/main.dart

@@ -19,6 +19,12 @@ Future<Response> fetch(Request _) async {
   return Response(
     [
       result.command == CommandType.select,
+      '''
+rowDescription =
+  columnCount = ${result.rowDescription?.columnCount}
+  columns =
+${result.rowDescription?.columns.map((e) => '    name = ${e.name}').join('\n')}
+      ''',
       result.query.resultType,
       ...result.rows.map(rowToPrettyString),
     ].join('\n\n'),

lib/src/column.dart

@@ -0,0 +1,68 @@
+import 'dart:js_interop';
+import 'dart:js_util';
+
+/// [[email protected]/Column](https://deno.land/x/[email protected]/query/decode.ts?s=Column).
+@JS()
+class Column {
+  /// [[email protected]/Column](https://deno.land/x/[email protected]/query/decode.ts?s=Column).
+  external String get name;
+
+  /// [[email protected]/Column](https://deno.land/x/[email protected]/query/decode.ts?s=Column).
+  external int get tableOid;
+
+  /// [[email protected]/Column](https://deno.land/x/[email protected]/query/decode.ts?s=Column).
+  external int get index;
+
+  /// [[email protected]/Column](https://deno.land/x/[email protected]/query/decode.ts?s=Column).
+  external int get typeOid;
+
+  /// [[email protected]/Column](https://deno.land/x/[email protected]/query/decode.ts?s=Column).
+  external int get columnLength;
+
+  /// [[email protected]/Column](https://deno.land/x/[email protected]/query/decode.ts?s=Column).
+  external int get typeModifier;
+
+  /// [[email protected]/Column](https://deno.land/x/[email protected]/query/decode.ts?s=Column#ctor_0).
+  factory Column({
+    required String name,
+    required int tableOid,
+    required int index,
+    required int typeOid,
+    required int columnLength,
+    required int typeModifier,
+    required ColumnFormat format,
+  }) =>
+      callConstructor('Column', [
+        name,
+        tableOid,
+        index,
+        typeOid,
+        columnLength,
+        typeModifier,
+        format.id,
+      ]);
+}
+
+/// [[email protected]/Column](https://deno.land/x/[email protected]/query/decode.ts?s=Column).
+extension ColumnProps on Column {
+  /// [[email protected]/Column](https://deno.land/x/[email protected]/query/decode.ts?s=Column).
+  ColumnFormat get format => ColumnFormat.values
+      .firstWhere((e) => e.id == getProperty(this, 'format'));
+}
+
+/// enum Format {
+///   TEXT = 0,
+///   BINARY = 1,
+/// }
+enum ColumnFormat {
+  /// text.
+  text(0),
+
+  /// binary.
+  binary(1);
+
+  /// Used for interop.
+  final int id;
+
+  const ColumnFormat(this.id);
+}

lib/src/query_result.dart

@@ -3,12 +3,16 @@ import 'dart:js_util';
 
 import 'package:deno_postgres_interop/src/command_type.dart';
 import 'package:deno_postgres_interop/src/query.dart';
+import 'package:deno_postgres_interop/src/row_description.dart';
 
 /// [[email protected]/QueryResult](https://deno.land/x/[email protected]/query/query.ts?s=QueryResult).
 @JS()
 class QueryResult {
   /// [[email protected]/QueryResult/constructor](https://deno.land/x/[email protected]/query/query.ts?s=QueryResult#ctor_0).
   external Query get query;
+
+  /// [[email protected]/QueryResult/rowDescription](https://deno.land/x/[email protected]/query/query.ts?s=QueryResult#accessor_rowDescription).
+  external RowDescription? get rowDescription;
 }
 
 /// [[email protected]/QueryResult](https://deno.land/x/[email protected]/query/query.ts?s=QueryResult).

lib/src/row_description.dart

@@ -0,0 +1,16 @@
+import 'dart:js_interop';
+
+import 'package:deno_postgres_interop/src/column.dart';
+
+/// [[email protected]/RowDescription](https://deno.land/x/[email protected]/query/query.ts?s=RowDescription).
+@JS()
+class RowDescription {
+  /// https://deno.land/x/[email protected]/query/query.ts?s=RowDescription#ctor_0
+  external int get columnCount;
+
+  /// https://deno.land/x/[email protected]/query/query.ts?s=RowDescription#ctor_0
+  external List<Column> get columns;
+
+  /// https://deno.land/x/[email protected]/query/query.ts?s=RowDescription#ctor_0
+  external factory RowDescription(int columnCount, List<Column> columns);
+}