1 files changed, 16 insertions, 4 deletions
diff --git a/lib/query.ml b/lib/query.ml
index 70285fc..179deb6 100644
--- a/lib/query.ml
+++ b/lib/query.ml
@@ -145,15 +145,27 @@ let sqlite_pragmas = [
 (* Example of how to execute raw SQL with Caqti *)
 let init_connection conn =
   let module C = (val conn : Rapper_helper.CONNECTION) in
-  (* Create a request: unit input -> unit output using Caqti infix operators *)
-  let pragma_req sql = 
+  (* For PRAGMA commands, we don't know the return type, so use a custom approach *)
+  (* Some return strings, some return ints, some return nothing *)
+  let exec_pragma sql =
     let open Caqti_request.Infix in
     let open Caqti_type in
-    (unit ->. unit) sql 
+    (* Try to execute as a simple exec first (for pragmas that return nothing) *)
+    match C.exec ((unit ->. unit) sql) () with
+    | Ok () -> Ok ()
+    | Error _ ->
+      (* If that fails, try as a query that returns a string *)
+      match C.find_opt ((unit ->? string) sql) () with
+      | Ok _ -> Ok ()
+      | Error _ ->
+        (* If that also fails, try as a query that returns an int *)
+        match C.find_opt ((unit ->? int) sql) () with
+        | Ok _ -> Ok ()
+        | Error e -> Error e
   in
   (* Execute each pragma *)
   List.fold_left (fun acc sql ->
     match acc with
     | Error e -> Error e
-    | Ok () -> C.exec (pragma_req sql) ()
+    | Ok () -> exec_pragma sql
   ) (Ok ()) sqlite_pragmas