feat: types

Author: CorvusYe

lib/dart_gdbc.dart

@@ -1,5 +1,7 @@
 library dart_gdbc;
 
+import 'dart:convert';
+
 part 'src/exeception/gdbc_exception.dart';
 part 'src/exeception/connect_exception.dart';
 part 'src/exeception/query_exception.dart';
@@ -14,6 +16,7 @@ part 'src/statement.dart';
 part 'src/result_set.dart';
 part 'src/result_set_meta_data.dart';
 part 'src/parameter_meta_data.dart';
+part 'src/value_meta_data.dart';
 
 part 'src/prepared_statement.dart';
 

lib/src/driver_manager.dart

@@ -16,8 +16,12 @@ class DriverManager {
     String? username,
     String? password,
   }) async {
-    var driver =
-        _drivers.values.firstWhere((element) => element.acceptsURL(url));
+    Driver? driver;
+    try {
+      driver = _drivers.values.firstWhere((element) => element.acceptsURL(url));
+    } catch (e) {
+      throw ArgumentError('No suitable driver found for $url');
+    }
     properties ??= {};
     if (username != null) {
       properties[usrKey] ??= username;

lib/src/exeception/gdbc_exception.dart

@@ -13,7 +13,7 @@ class GdbcException implements Error {
   @override
   String toString() {
     var buffer = StringBuffer();
-    buffer.write('GdbcException');
+    buffer.write(runtimeType);
     if (message != null) {
       buffer.write(': $message');
     }

lib/src/result_set.dart

@@ -2,4 +2,15 @@ part of dart_gdbc;
 
 abstract class ResultSet {
   bool success = false;
+
+  List<ValueMetaData> get metas;
+
+  List<List<dynamic>> get rows;
+
+  List<String?> get columns => metas.map((e) => e.name).toList();
+
+  @override
+  String toString() {
+    return '$runtimeType{\n\tsuccess: $success,\n\tmetas: ${metas.map((e) => e.toJson()).toList()},\n\tcolumns: $columns,\n\trows: ${jsonEncode(rows)}\n}';
+  }
 }

lib/src/types.dart

@@ -2,26 +2,38 @@ part of dart_gdbc;
 
 enum GdbTypes {
   // types in graph database
-  axisLine,
-  axisPoint,
-  axisPolygon,
+  line,
+  point,
+  polygon,
   node,
+  tag,
+  prop,
   path,
   relationship,
+  step,
 
   // basic types in dart
-  bytes,
+  bool,
+  byte,
+  short,
   int,
+  long,
+  float,
   double,
+
+  bytes,
   string,
-  bool,
+
   date,
   time,
   dateTime,
   duration,
+
   list,
   map,
   set,
   none,
+
   unknown,
+  dataSet,
 }

lib/src/value_meta_data.dart

@@ -0,0 +1,30 @@
+part of dart_gdbc;
+
+class ValueMetaData {
+  late GdbTypes? type;
+  String? name;
+  final List<ValueMetaData> submetas = [];
+
+  addSubmeta(ValueMetaData submeta) {
+    var idx =
+        submetas.lastIndexWhere((element) => element.name == submeta.name);
+    if (idx == -1) {
+      submetas.add(submeta);
+      return submetas.length - 1;
+    }
+    return idx;
+  }
+
+  @override
+  String toString() {
+    return '$runtimeType{type: $type, name: $name, submetas: $submetas}';
+  }
+
+  Map<String, dynamic> toJson() {
+    return {
+      "'type'": type?.index,
+      "'name'": "'$name'",
+      "'submetas'": submetas.map((e) => e.toJson()).toList(),
+    };
+  }
+}