From adb99eccd1c407bc38dd83115e886d8b05eb8d47 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Istv=C3=A1n=20So=C3=B3s?= <isoos@users.noreply.github.com>
Date: Sat, 23 Dec 2023 01:12:09 +0100
Subject: [PATCH] Support char[acter] type. (#274)

---
 CHANGELOG.md                     |  4 ++++
 lib/src/types.dart               |  3 +++
 lib/src/types/binary_codec.dart  |  2 ++
 lib/src/types/text_codec.dart    |  1 +
 lib/src/types/type_registry.dart |  5 +++++
 pubspec.yaml                     |  3 ++-
 test/encoding_test.dart          | 10 ++++++++++
 7 files changed, 27 insertions(+), 1 deletion(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index ebde1872..85acb931 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Changelog
 
+## 3.0.5
+
+- Support for type `char`/`character`/`bpchar`.
+
 ## 3.0.4
 
 - Fix: SSL connection problem handler.
diff --git a/lib/src/types.dart b/lib/src/types.dart
index c9f23190..f23d391a 100644
--- a/lib/src/types.dart
+++ b/lib/src/types.dart
@@ -147,6 +147,9 @@ abstract class Type<T extends Object> {
   /// Used to represent value without any type representation.
   static const unspecified = UnspecifiedType();
 
+  /// Must be a [String]
+  static const char = GenericType<String>(TypeOid.char);
+
   /// Must be a [String].
   static const text = GenericType<String>(TypeOid.text);
 
diff --git a/lib/src/types/binary_codec.dart b/lib/src/types/binary_codec.dart
index a0f3fb98..2dacff52 100644
--- a/lib/src/types/binary_codec.dart
+++ b/lib/src/types/binary_codec.dart
@@ -92,6 +92,7 @@ class PostgresBinaryEncoder {
           throw FormatException(
               'Invalid type for parameter value. Expected: int Got: ${input.runtimeType}');
         }
+      case TypeOid.char:
       case TypeOid.name:
       case TypeOid.text:
       case TypeOid.varChar:
@@ -518,6 +519,7 @@ class PostgresBinaryDecoder {
         ByteData.view(input.buffer, input.offsetInBytes, input.lengthInBytes);
 
     switch (typeOid) {
+      case TypeOid.char:
       case TypeOid.name:
       case TypeOid.text:
       case TypeOid.varChar:
diff --git a/lib/src/types/text_codec.dart b/lib/src/types/text_codec.dart
index 4bdc3c59..cea0a470 100644
--- a/lib/src/types/text_codec.dart
+++ b/lib/src/types/text_codec.dart
@@ -228,6 +228,7 @@ class PostgresTextDecoder {
   Object? convert(DecodeInput di) {
     // ignore: unnecessary_cast
     switch (_typeOid) {
+      case TypeOid.char:
       case TypeOid.name:
       case TypeOid.text:
       case TypeOid.varChar:
diff --git a/lib/src/types/type_registry.dart b/lib/src/types/type_registry.dart
index fc409289..f888923f 100644
--- a/lib/src/types/type_registry.dart
+++ b/lib/src/types/type_registry.dart
@@ -20,6 +20,7 @@ class TypeOid {
   static const boolean = 16;
   static const booleanArray = 1000;
   static const byteArray = 17;
+  static const char = 1042;
   static const date = 1082;
   static const double = 701;
   static const doubleArray = 1022;
@@ -47,6 +48,7 @@ class TypeOid {
 
 final _builtInTypes = <Type>{
   Type.unspecified,
+  Type.char,
   Type.name,
   Type.text,
   Type.varChar,
@@ -81,6 +83,9 @@ final _builtInTypeNames = <String, Type>{
   'bigint': Type.bigInteger,
   'boolean': Type.boolean,
   'bytea': Type.byteArray,
+  'bpchar': Type.char,
+  'char': Type.char,
+  'character': Type.char,
   'date': Type.date,
   'double precision': Type.double,
   'float4': Type.real,
diff --git a/pubspec.yaml b/pubspec.yaml
index dcd536ca..f13354d8 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,9 +1,10 @@
 name: postgres
 description: PostgreSQL database driver. Supports statement reuse and binary protocol and connection pooling.
-version: 3.0.4
+version: 3.0.5
 homepage: https://github.com/isoos/postgresql-dart
 topics:
   - sql
+  - db
   - database
   - postgres
 
diff --git a/test/encoding_test.dart b/test/encoding_test.dart
index 800318fd..8c7c21a4 100644
--- a/test/encoding_test.dart
+++ b/test/encoding_test.dart
@@ -305,6 +305,16 @@ void main() {
       }
     });
 
+    test('char', () async {
+      await expectReversible(
+        'char',
+        [null, 'a'],
+        negative: 0,
+        expectedDartType: 'String',
+      );
+    });
+
+
     test('varchar', () async {
       await expectReversible(
         'varchar',