[MM-43500] Fix MattermostAppID null values with NOT NULL constraint (#20028)

db/migrations/mysql/000082_upgrade_oauth_mattermost_app_id.down.sql

@@ -0,0 +1,14 @@
+SET @preparedStatement = (SELECT IF(
+    (
+        SELECT COUNT(*) FROM INFORMATION_SCHEMA.COLUMNS
+        WHERE table_name = 'OAuthApps'
+        AND table_schema = DATABASE()
+        AND column_name = 'MattermostAppID'
+    ) > 0,
+    'ALTER TABLE OAuthApps MODIFY MattermostAppID varchar(32);',
+    'SELECT 1'
+));
+
+PREPARE alterIfExists FROM @preparedStatement;
+EXECUTE alterIfExists;
+DEALLOCATE PREPARE alterIfExists;

db/migrations/mysql/000082_upgrade_oauth_mattermost_app_id.up.sql

@@ -0,0 +1,29 @@
+SET @preparedStatement = (SELECT IF(
+    (
+        SELECT COUNT(*) FROM INFORMATION_SCHEMA.COLUMNS
+        WHERE table_name = 'OAuthApps'
+        AND table_schema = DATABASE()
+        AND column_name = 'MattermostAppID'
+    ) > 0,
+    'UPDATE OAuthApps SET MattermostAppID = "" WHERE MattermostAppID IS NULL;',
+    'SELECT 1'
+));
+
+PREPARE alterIfExists FROM @preparedStatement;
+EXECUTE alterIfExists;
+DEALLOCATE PREPARE alterIfExists;
+
+SET @preparedStatement = (SELECT IF(
+    (
+        SELECT COUNT(*) FROM INFORMATION_SCHEMA.COLUMNS
+        WHERE table_name = 'OAuthApps'
+        AND table_schema = DATABASE()
+        AND column_name = 'MattermostAppID'
+    ) > 0,
+    'ALTER TABLE OAuthApps MODIFY MattermostAppID varchar(32) NOT NULL DEFAULT "";',
+    'SELECT 1'
+));
+
+PREPARE alterIfExists FROM @preparedStatement;
+EXECUTE alterIfExists;
+DEALLOCATE PREPARE alterIfExists;

db/migrations/postgres/000082_upgrade_oauth_mattermost_app_id.down.sql

@@ -0,0 +1,13 @@
+DO $$
+DECLARE
+    column_exist boolean := false;
+BEGIN
+SELECT count(*) != 0 INTO column_exist
+    FROM information_schema.columns
+    WHERE table_name = 'oauthapps'
+    AND column_name = 'mattermostappid';
+IF column_exist THEN
+    ALTER TABLE OAuthApps ALTER COLUMN MattermostAppID DROP NOT NULL;
+    ALTER TABLE OAuthApps ALTER COLUMN MattermostAppID DROP DEFAULT;
+END IF;
+END $$;

db/migrations/postgres/000082_upgrade_oauth_mattermost_app_id.up.sql

@@ -0,0 +1,14 @@
+DO $$
+DECLARE
+    column_exist boolean := false;
+BEGIN
+SELECT count(*) != 0 INTO column_exist
+    FROM information_schema.columns
+    WHERE table_name = 'oauthapps'
+    AND column_name = 'mattermostappid';
+IF column_exist THEN
+    UPDATE OAuthApps SET MattermostAppID = '' WHERE MattermostAppID IS NULL;
+    ALTER TABLE OAuthApps ALTER COLUMN MattermostAppID SET DEFAULT '';
+    ALTER TABLE OAuthApps ALTER COLUMN MattermostAppID SET NOT NULL;
+END IF;
+END $$;