Fixed #25196 -- Normalized database representations in test database messages.

Left over Oracle mostly as-is since it's more complicated.

django/db/backends/base/creation.py

@@ -39,15 +39,14 @@ class BaseDatabaseCreation(object):
         test_database_name = self._get_test_db_name()
 
         if verbosity >= 1:
-            test_db_repr = ''
             action = 'Creating'
-            if verbosity >= 2:
-                test_db_repr = " ('%s')" % test_database_name
             if keepdb:
                 action = "Using existing"
 
-            print("%s test database for alias '%s'%s..." % (
-                action, self.connection.alias, test_db_repr))
+            print("%s test database for alias %s..." % (
+                action,
+                self._get_database_display_str(verbosity, test_database_name),
+            ))
 
         # We could skip this call if keepdb is True, but we instead
         # give it the keepdb param. This is to handle the case
@@ -132,6 +131,15 @@ class BaseDatabaseCreation(object):
         for obj in serializers.deserialize("json", data, using=self.connection.alias):
             obj.save()
 
+    def _get_database_display_str(self, verbosity, database_name):
+        """
+        Return display string for a database for use in various actions.
+        """
+        return "'%s'%s" % (
+            self.connection.alias,
+            (" ('%s')" % database_name) if verbosity >= 2 else '',
+        )
+
     def _get_test_db_name(self):
         """
         Internal implementation - returns the name of the test DB that will be
@@ -173,8 +181,9 @@ class BaseDatabaseCreation(object):
                 if autoclobber or confirm == 'yes':
                     try:
                         if verbosity >= 1:
-                            print("Destroying old test database '%s'..."
-                                  % self.connection.alias)
+                            print("Destroying old test database for alias %s..." % (
+                                self._get_database_display_str(verbosity, test_database_name),
+                            ))
                         cursor.execute(
                             "DROP DATABASE %s" % qn(test_database_name))
                         cursor.execute(
@@ -197,13 +206,13 @@ class BaseDatabaseCreation(object):
         source_database_name = self.connection.settings_dict['NAME']
 
         if verbosity >= 1:
-            test_db_repr = ''
             action = 'Cloning test database'
-            if verbosity >= 2:
-                test_db_repr = " ('%s')" % source_database_name
             if keepdb:
                 action = 'Using existing clone'
-            print("%s for alias '%s'%s..." % (action, self.connection.alias, test_db_repr))
+            print("%s for alias %s..." % (
+                action,
+                self._get_database_display_str(verbosity, source_database_name),
+            ))
 
         # We could skip this call if keepdb is True, but we instead
         # give it the keepdb param. See create_test_db for details.
@@ -241,14 +250,13 @@ class BaseDatabaseCreation(object):
             test_database_name = self.get_test_db_clone_settings(number)['NAME']
 
         if verbosity >= 1:
-            test_db_repr = ''
             action = 'Destroying'
-            if verbosity >= 2:
-                test_db_repr = " ('%s')" % test_database_name
             if keepdb:
                 action = 'Preserving'
-            print("%s test database for alias '%s'%s..." % (
-                action, self.connection.alias, test_db_repr))
+            print("%s test database for alias %s..." % (
+                action,
+                self._get_database_display_str(verbosity, test_database_name),
+            ))
 
         # if we want to preserve the database
         # skip the actual destroying piece.

django/db/backends/mysql/creation.py

@@ -30,7 +30,9 @@ class DatabaseCreation(BaseDatabaseCreation):
                     return
                 try:
                     if verbosity >= 1:
-                        print("Destroying old test database '%s'..." % self.connection.alias)
+                        print("Destroying old test database for alias %s..." % (
+                            self._get_database_display_str(target_database_name, verbosity),
+                        ))
                     cursor.execute("DROP DATABASE %s" % qn(target_database_name))
                     cursor.execute("CREATE DATABASE %s" % qn(target_database_name))
                 except Exception as e:

django/db/backends/oracle/creation.py

@@ -48,7 +48,7 @@ class DatabaseCreation(BaseDatabaseCreation):
                         "Type 'yes' to delete it, or 'no' to cancel: " % parameters['user'])
                 if autoclobber or confirm == 'yes':
                     if verbosity >= 1:
-                        print("Destroying old test database '%s'..." % self.connection.alias)
+                        print("Destroying old test database for alias '%s'..." % self.connection.alias)
                     try:
                         self._execute_test_db_destruction(cursor, parameters, verbosity)
                     except DatabaseError as e:
@@ -149,7 +149,7 @@ class DatabaseCreation(BaseDatabaseCreation):
                     sys.exit(2)
                 try:
                     if verbosity >= 1:
-                        print("Destroying old test database '%s'..." % self.connection.alias)
+                        print("Destroying old test database for alias '%s'..." % self.connection.alias)
                     self._execute_test_db_destruction(cursor, parameters, verbosity)
                 except Exception as e:
                     sys.stderr.write("Got an error destroying the test database: %s\n" % e)

django/db/backends/postgresql/creation.py

@@ -32,7 +32,9 @@ class DatabaseCreation(BaseDatabaseCreation):
                     return
                 try:
                     if verbosity >= 1:
-                        print("Destroying old test database '%s'..." % self.connection.alias)
+                        print("Destroying old test database for alias %s..." % (
+                            self._get_database_display_str(target_database_name, verbosity),
+                        ))
                     cursor.execute("DROP DATABASE %s" % qn(target_database_name))
                     cursor.execute("CREATE DATABASE %s WITH TEMPLATE %s" % (
                         qn(target_database_name), qn(source_database_name)))

django/db/backends/sqlite3/creation.py

@@ -30,7 +30,9 @@ class DatabaseCreation(BaseDatabaseCreation):
         if not self.connection.is_in_memory_db(test_database_name):
             # Erase the old test database
             if verbosity >= 1:
-                print("Destroying old test database '%s'..." % self.connection.alias)
+                print("Destroying old test database for alias %s..." % (
+                    self._get_database_display_str(verbosity, test_database_name),
+                ))
             if os.access(test_database_name, os.F_OK):
                 if not autoclobber:
                     confirm = input(
@@ -69,7 +71,9 @@ class DatabaseCreation(BaseDatabaseCreation):
                 if keepdb:
                     return
                 if verbosity >= 1:
-                    print("Destroying old test database '%s'..." % target_database_name)
+                    print("Destroying old test database for alias %s..." % (
+                        self._get_database_display_str(verbosity, target_database_name),
+                    ))
                 try:
                     os.remove(target_database_name)
                 except Exception as e: