Error: Identifier not found "tiReadCommitted" lazarus / 16-Databases ---------------------------------------------------------------------- Nju · 2019-10-21 13:35 Hey, I'm little bit confused. I would change the TransactIsolationLevel of a ZEOS-Connection (lib-version: 7.2.0.0 from the repository) per code like this: Code: Pascal  [Select][+][-]window.onload = function(){var x1 = document.getElementById("main_content_section"); if (x1) { var x = document.getElementsByClassName("geshi");for (var i = 0; i myConnection.TransactIsolationLevel := tiReadCommitted; When I press "compile" now I get the error-message above in the title of this thread. I know in this case a unit is missing in the "uses"-list, but which one I need? Best regards ---------------------------------------------------------------------- Thaddy · 2019-10-21 14:01 Add ZDbcIntfs to the uses clause.