Update database not working

I try:

xhr.onload = function(e) {
          var uInt8Array = new Uint8Array(this.response);
          var db = new SQL.Database(uInt8Array);
          var contents = db.exec("SELECT * FROM drugs WHERE id="+idDrug+"");

          var viewed = parseInt(contents[0]['values'][0][6])+1;
          
          var stmt = db.prepare("update drugs set viewed=? where id=?");
          stmt.bind([viewed, idDrug]);
}

But row not update, please help me.

No repository file or test is named. Start by reproducing the JavaScript snippet through the SQL.Database entry point, then inspect how prepare(), bind(), and update execution are documented or exercised; done means confirming why the row remains unchanged and verifying that the update persists.