Errors

example/lib/main.dart

@@ -9,34 +9,50 @@ Future<Response> fetch(Request _) async {
 
   final client = Client(dbUrl);
   await client.connect();
-  final result = await client.transaction(
-    'transaction',
-    transaction,
-    TransactionOptions(isolationLevel: IsolationLevel.serializable),
-  );
-  await client.end();
+  try {
+    final result = await client.transaction(
+      'transaction',
+      transaction,
+      TransactionOptions(isolationLevel: IsolationLevel.serializable),
+    );
+    await client.end();
 
-  return Response(
-    [
-      result.command == CommandType.select,
-      'warnings = ${result.warnings}',
-      '''
+    return Response(
+      [
+        result.command == CommandType.select,
+        'warnings = ${result.warnings}',
+        '''
 rowDescription =
   columnCount = ${result.rowDescription?.columnCount}
   columns =
 ${result.rowDescription?.columns.map((e) => '    name = ${e.name}').join('\n')}
       ''',
-      result.query.resultType,
-      ...result.rows.map(rowToPrettyString),
-    ].join('\n\n'),
-  );
+        result.query.resultType,
+        ...result.rows.map(rowToPrettyString),
+      ].join('\n\n'),
+    );
+  } on TransactionError catch (e) {
+    await client.end();
+
+    return Response('''
+${e.name}
+${e.cause}
+  ${e.cause.name}
+  ${e.cause.cause}
+  ${e.cause.message}
+  ${e.cause.fields}
+${e.message}
+$e
+''');
+  }
 }
 
 Future<QueryObjectResult<dynamic>> transaction(Transaction transaction) async {
   await transaction.queryObject(
     'UPDATE public."User" '
     r'SET username=$1 '
-    "WHERE last_name='user'",
+    "WHERE last_name='user'"
+    'AND y = z',
     ["'user${transaction.hashCode}'"],
   );
   await Future.delayed(const Duration(seconds: 10));

lib/deno_postgres_interop.dart

@@ -9,6 +9,10 @@ export 'src/command_type.dart';
 export 'src/connection.dart';
 export 'src/connection_options.dart';
 export 'src/encoded_arg.dart';
+export 'src/errors/connection_error.dart';
+export 'src/errors/connection_params_error.dart';
+export 'src/errors/postgres_error.dart';
+export 'src/errors/transaction_error.dart';
 export 'src/isolation_level.dart';
 export 'src/notice.dart';
 export 'src/partial/partial_connection_options.dart';

lib/src/errors/connection_error.dart

@@ -0,0 +1,7 @@
+import 'dart:js_interop';
+
+import 'package:deno_postgres_interop/src/errors/js_error.dart';
+
+/// [deno-postgres@v0.17.0/ConnectionError](https://deno.land/x/postgres@v0.17.0/client/error.ts?s=ConnectionError).
+@JS('Error')
+class ConnectionError extends JSError {}

lib/src/errors/connection_params_error.dart

@@ -0,0 +1,7 @@
+import 'dart:js_interop';
+
+import 'package:deno_postgres_interop/src/errors/js_error.dart';
+
+/// [deno-postgres@v0.17.0/ConnectionParamsError](https://deno.land/x/postgres@v0.17.0/client/error.ts?s=ConnectionParamsError).
+@JS('Error')
+class ConnectionParamsError extends JSError {}

lib/src/errors/js_error.dart

@@ -0,0 +1,14 @@
+import 'dart:js_interop';
+
+/// [js/Error](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Error).
+@JS('Error')
+class JSError {
+  /// [js/Error/name](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Error/name).
+  external String get name;
+
+  /// [js/Error/cause](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Error/cause).
+  external Error? get cause;
+
+  /// [js/Error/message](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Error/message).
+  external String get message;
+}

lib/src/errors/postgres_error.dart

@@ -0,0 +1,11 @@
+import 'dart:js_interop';
+
+import 'package:deno_postgres_interop/src/errors/js_error.dart';
+import 'package:deno_postgres_interop/src/notice.dart';
+
+/// [deno-postgres@v0.17.0/PostgresError](https://deno.land/x/postgres@v0.17.0/client/error.ts?s=TransactionError).
+@JS()
+class PostgresError extends JSError {
+  /// [deno-postgres@v0.17.0/PostgresError](https://deno.land/x/postgres@v0.17.0/client/error.ts?s=PostgresError#prop_fields).
+  external Notice get fields;
+}

lib/src/errors/transaction_error.dart

@@ -0,0 +1,17 @@
+import 'dart:js_interop';
+
+import 'package:deno_postgres_interop/src/errors/postgres_error.dart';
+
+/// [deno-postgres@v0.17.0/TransactionError](https://deno.land/x/postgres@v0.17.0/client/error.ts?s=TransactionError).
+@JS()
+class TransactionError {
+  /// [js/Error/cause](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Error/cause).
+  /// [deno-postgres@v0.17.0/TransactionError/constructor](https://deno.land/x/postgres@v0.17.0/client/error.ts?s=TransactionError#ctor_0).
+  external PostgresError get cause;
+
+  /// [js/Error/message](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Error/message).
+  external String get message;
+
+  /// [js/Error/name](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Error/name).
+  external String get name;
+}

pubspec.yaml

@@ -1,5 +1,7 @@
 name: deno_postgres_interop
-description: An interop for deno-postgres.
+description:
+  An interop for js package deno-postgres - PostgreSQL
+  driver that can be used in deno-deploy (supabase edge functions).
 version: 0.0.1
 repository: https://github.com/solid-software/deno_postgres_interop