Question

i am trying to insert the new data if and only if, this data doesnot exist in the database, if it exists, just break the insert operation and take the next item and try to check and insertg again, i want something like this:

insert into db if field_id doesnot exist, if exist, dont touch anything, neither update nor anything

ON DUPLICATE KEY UPDATE is not what i want and INSERT IGNORE seems to be mysterious to me now

this is my attempt:

$check = "SELECT anzeige_id FROM table WHERE anzeige_id = '$whatIhaveInMyHand'";
$checked=mysql_query($check);
if(mysql_num_rows($checked)==0){
$sql = "INSERT INTO table (`firmen_id`,`anzeige_id`,`anzeige_txt`) VALUES ('$firma_id','$anzeigen_id','$anzeige_txt')";
$sql_inserted = mysql_query($sql);
if($sql_inserted){
   echo "inserted into db <br/>";
}else{
  echo "anzeige_id already exists ".$anzeigen_id."<br/>";
}

what is good for my plan?

Answer 1

Set a UNIQUE constraint on the field you are using to identify the data set if it is not already PRIMARY KEY and use INSERT IGNORE. That will result in new data set being inserted and old data sets failing to insert silently.