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$query_insert=”UPDATE table_name set field1=’”.$_POST['data1'].”‘, field2=’”.$_POST['data2'].”‘ WHERE id=’”.$_POST['id'].”‘”;
$result_insert=mysql_query($query_insert) or die (mysql_error());

$database=mysql_connect(”localhost”, “”, “”) or die(mysql_error());
mysql_select_db(”") or die (mysql_error());

$query=”INSERT INTO tablename (field1,field2)VALUES(’”.$data1.”‘,’”.$data.”‘)” or die (mysql_error());
$result = mysql_query ($query, $database);