fix(oceanbase): support manual transaction control in oracle mode

apps/desktop/src/lib/database/databaseFeatureSupport.ts

@@ -257,7 +257,12 @@ export function usesPostgresLikeStructureCopy(dbType?: DatabaseType): boolean {
   return !!dbType && PG_LIKE_STRUCTURE_TYPES.has(dbType);
 }
 
-const TRANSACTION_SUPPORTED_TYPES: readonly string[] = ["postgres", "mysql", "oracle", "jdbc"];
+const TRANSACTION_SUPPORTED_TYPES: readonly string[] = ["postgres", "mysql", "oracle", "jdbc", "oceanbase-oracle"];
+
+/** Oracle-family databases that use the sticky manual-transaction UX. OceanBase
+ * Oracle mode runs the same transaction model as Oracle, so it shares the
+ * commit/rollback dirty-state behavior rather than the generic transaction path. */
+const ORACLE_STICKY_TRANSACTION_TYPES: ReadonlySet<string> = new Set(["oracle", "oceanbase-oracle"]);
 
 /**
  * Returns true if the given database type supports explicit transaction control
@@ -311,6 +316,14 @@ export function rejectsAliasReferenceInHaving(dbType?: string): boolean {
   return !!dbType && HAVING_ALIAS_REJECTED_DATABASE_TYPES.has(dbType);
 }
 
+/**
+ * Returns true if the database type uses Oracle's sticky manual-transaction state
+ * (commit/rollback hidden until an unproven statement dirties the session).
+ */
+export function usesOracleStickyTransactionState(dbType?: string): boolean {
+  return !!dbType && ORACLE_STICKY_TRANSACTION_TYPES.has(dbType);
+}
+
 /**
  * Default auto-commit mode when opening a query tab for the given database type.
  * Query tabs default to auto-commit; users can explicitly switch to manual transactions.