php - Prepared statement with and without "on duplicate key update" -


i trying remove on duplicate key update because have duplicates. statement work , inserts data not duplicates. please help.

$sql = "insert projectselect (id_proj, project, role, id_agent) values ( ?,?,?, ( select idagency agentsinfo email = ?)) on duplicate key update `id_agent` = values(`id_agent`), `project` = values(`project`), `role` = values(`role`) ";  if (($stmt = $con->prepare($sql)) === false) { trigger_error($con->error, e_user_error); }  $result2= mysqli_query($con, $idq);  $row_number = 1;  while ($row = mysqli_fetch_array($result2)) {  $id_proj= $row["id_proj"]; $project= $row["project"]; $role= $row["role"]; $id_proj++;  }   if ($stmt->bind_param("ssss", $id_proj, $postproj, $postrole, $_session["email"]) === false) { trigger_error($stmt->error, e_user_error);  }   if (($stmt->execute()) === false) { trigger_error($stmt->error, e_user_error); }

you have understand on duplicate key triggered when insertion of record conflicts existing ones, , conflict happen when table has "unique" fields -- fields value can exist once among records of table.

first thing have fix remove unique , primary keys , indexes table. once done, whole thing should work already.

you can remove on duplicate key... statement query once no longer relevant, keep code clean.


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