Fix for test failure against sqlean

sqlite_utils/db.py

@@ -713,10 +713,14 @@ class Database:
         args: tuple = (params,) if params is not None else ()
         if keyword == "PRAGMA":
             # Some PRAGMA statements refuse to run inside a transaction, so
-            # execute these without the savepoint guard used below. PRAGMAs
+            # execute these without the savepoint guard used below. Some
-            # never open an implicit transaction, so there is nothing to
+            # adapters open an implicit transaction before comment-prefixed
-            # undo if this one turns out not to return rows
+            # PRAGMAs, so temporarily use driver autocommit when it is safe.
-            cursor = self.conn.execute(sql, *args)
+            if self.conn.in_transaction:
+                cursor = self.conn.execute(sql, *args)
+            else:
+                with self.ensure_autocommit_off():
+                    cursor = self.conn.execute(sql, *args)
             if cursor.description is None:
                 raise ValueError(message)
             keys = [d[0] for d in cursor.description]

tests/test_query.py

@@ -114,6 +114,15 @@ def test_query_comment_prefixed_pragma(tmpdir):
     db.close()
 
 
+def test_query_comment_prefixed_pragma_inside_transaction(fresh_db):
+    fresh_db.begin()
+    assert list(fresh_db.query("-- check version\npragma user_version")) == [
+        {"user_version": 0}
+    ]
+    assert fresh_db.conn.in_transaction
+    fresh_db.rollback()
+
+
 @pytest.mark.parametrize(
     "sql,expected",
     [