From b3eb6eaf1a197ff155faf333871da032c77ba855 Mon Sep 17 00:00:00 2001
From: Mariusz Felisiak <felisiak.mariusz@gmail.com>
Date: Tue, 23 May 2017 15:09:35 +0200
Subject: [PATCH] Refs #27859 -- Added DatabaseWrapper.display_name.

Thanks Tim Graham for the review.
---
 django/db/backends/base/base.py       | 1 +
 django/db/backends/mysql/base.py      | 1 +
 django/db/backends/oracle/base.py     | 1 +
 django/db/backends/postgresql/base.py | 1 +
 django/db/backends/sqlite3/base.py    | 1 +
 docs/releases/2.0.txt                 | 4 ++++
 tests/backends/tests.py               | 4 ++++
 7 files changed, 13 insertions(+)

diff --git a/django/db/backends/base/base.py b/django/db/backends/base/base.py
index 5baff6a34a..660542c095 100644
--- a/django/db/backends/base/base.py
+++ b/django/db/backends/base/base.py
@@ -31,6 +31,7 @@ class BaseDatabaseWrapper:
     data_type_check_constraints = {}
     ops = None
     vendor = 'unknown'
+    display_name = 'unknown'
     SchemaEditorClass = None
     # Classes instantiated in __init__().
     client_class = None
diff --git a/django/db/backends/mysql/base.py b/django/db/backends/mysql/base.py
index 08632a0ec5..f32dee09a8 100644
--- a/django/db/backends/mysql/base.py
+++ b/django/db/backends/mysql/base.py
@@ -103,6 +103,7 @@ class CursorWrapper:
 
 class DatabaseWrapper(BaseDatabaseWrapper):
     vendor = 'mysql'
+    display_name = 'MySQL'
     # This dictionary maps Field objects to their associated MySQL column
     # types, as strings. Column-type strings can contain format strings; they'll
     # be interpolated against the values of Field.__dict__ before being output.
diff --git a/django/db/backends/oracle/base.py b/django/db/backends/oracle/base.py
index 65aac70b9e..fb49fc5ffb 100644
--- a/django/db/backends/oracle/base.py
+++ b/django/db/backends/oracle/base.py
@@ -72,6 +72,7 @@ class _UninitializedOperatorsDescriptor:
 
 class DatabaseWrapper(BaseDatabaseWrapper):
     vendor = 'oracle'
+    display_name = 'Oracle'
     # This dictionary maps Field objects to their associated Oracle column
     # types, as strings. Column-type strings can contain format strings; they'll
     # be interpolated against the values of Field.__dict__ before being output.
diff --git a/django/db/backends/postgresql/base.py b/django/db/backends/postgresql/base.py
index dd20656c3b..15adb0282e 100644
--- a/django/db/backends/postgresql/base.py
+++ b/django/db/backends/postgresql/base.py
@@ -59,6 +59,7 @@ psycopg2.extensions.register_type(INETARRAY)
 
 class DatabaseWrapper(BaseDatabaseWrapper):
     vendor = 'postgresql'
+    display_name = 'PostgreSQL'
     # This dictionary maps Field objects to their associated PostgreSQL column
     # types, as strings. Column-type strings can contain format strings; they'll
     # be interpolated against the values of Field.__dict__ before being output.
diff --git a/django/db/backends/sqlite3/base.py b/django/db/backends/sqlite3/base.py
index 7806402055..5892de92f8 100644
--- a/django/db/backends/sqlite3/base.py
+++ b/django/db/backends/sqlite3/base.py
@@ -45,6 +45,7 @@ Database.register_adapter(decimal.Decimal, backend_utils.rev_typecast_decimal)
 
 class DatabaseWrapper(BaseDatabaseWrapper):
     vendor = 'sqlite'
+    display_name = 'SQLite'
     # SQLite doesn't actually support most of these types, but it "does the right
     # thing" given more verbose field definitions, so leave them as is so that
     # schema inspection is more useful.
diff --git a/docs/releases/2.0.txt b/docs/releases/2.0.txt
index 0411e8fb2d..186f64319d 100644
--- a/docs/releases/2.0.txt
+++ b/docs/releases/2.0.txt
@@ -258,6 +258,10 @@ Database backend API
   ``datetime_extract_sql()`` methods now return only the SQL to perform the
   operation instead of SQL and a list of parameters.
 
+* Third-party database backends should add a ``DatabaseWrapper.display_name``
+  attribute with the name of the database that your backend works with. Django
+  may use it in various messages, such as in system checks.
+
 Dropped support for Oracle 11.2
 -------------------------------
 
diff --git a/tests/backends/tests.py b/tests/backends/tests.py
index 7853d02a24..7ea11b846f 100644
--- a/tests/backends/tests.py
+++ b/tests/backends/tests.py
@@ -55,6 +55,10 @@ class DatabaseWrapperTests(SimpleTestCase):
             instance_attr_value = getattr(conn, instance_attr_name)
             self.assertIsInstance(instance_attr_value, class_attr_value)
 
+    def test_initialization_display_name(self):
+        self.assertEqual(BaseDatabaseWrapper.display_name, 'unknown')
+        self.assertNotEqual(connection.display_name, 'unknown')
+
 
 class DummyBackendTest(SimpleTestCase):