Zwei Werte prüfen vor dem insert in der DB

 public function add_newfee($sf_nid, $sf_sid, $sf_name, $sf_fee_eur, $sf_fee_cent, $sf_sem, $sf_semy, $sf_sp, $sf_uni, $sf_comment){
			
			
			if (!$sf_nid || !$sf_sid  || !$sf_name  || !$sf_fee_eur || !$sf_fee_cent || !$sf_sem || !$sf_semy || !$sf_sp || !$sf_uni) {
				echo '<div class="error">';  
    			echo 'Daten fehlen';  
				echo '<br>';  
				die(mysql_error());
				echo '</div>';  
				}
			
			require ('db_connect.php');			  
			$tbl_name="infrastructure.studyfees"; // Table name  
			
			// Connect to server and select databse.
			mysql_connect("$host", "$username", "$password")or die("cannot connect");  
			mysql_select_db("$db_name")or die("cannot select DB");  
			mysql_query("set names 'utf8'");  
			
			
		    $sf_checkID ="SELECT sf_nid,sf_name,sf_sem FROM $tbl_name WHERE sf_nid = '%$sf_nid%' AND sf_sem = '%$sf_sem%' ";  

				 echo mysql_error();
				 echo"<br><br>";  
				
				$result = mysql_query($sf_checkID);
				if (mysql_num_rows($result) > 0) {
				
				
				// $sf_nid_s = $row['0']; 
			    // $sf_sem_s = $row['2']; 
						
						echo '<div class="error">';  
						echo "es wurden Studiengebühren für";  
						echo "/ة ";  
						echo '<br>';  
						echo $result['sf_name'];  
						echo '<br>';  
						echo "schon bezahlt";  
						echo '</div>';  

						
						}
						
				else {
				
				$sf_insert="INSERT INTO $tbl_name(sf_nid,sf_sid,sf_name,sf_fee_eur,sf_fee_cent,sf_sem,sf_semy,sf_sp,sf_uni,sf_comment)  
				VALUES('$sf_nid','$sf_sid','$sf_name','$sf_fee_eur','$sf_fee_cent','$sf_sem','$sf_semy','$sf_sp','$sf_uni','$sf_comment')";  
					$write = mysql_query($sf_insert);
					if(!$write) //checking here if record is inserted
							{
		                echo '<div class="error">';  
						echo "daten wurde nicht gespeichert ";  
						echo '</div>';  
						
						echo '<div class="error">';		  
						die('Error:'. mysql_error());  
						echo '</div>';  
							}
						
						else
						{
						
						$sf_check_OK = mysql_query("SELECT sf_name,sf_fee_eur,sf_fee_cent FROM studyfees group by sf_name DESC LIMIT 1");  
						$row = mysql_fetch_assoc($sf_check_OK);
					 	echo '<div class="succes">';  
						print('es wurden  daten erfolgreich gespeichert');  
						echo '</div>';  
						echo '<div class="succes">';  
						print $row["sf_fee_eur"];  
						print ',';  
						print $row["sf_fee_cent"];  
						echo '</div>';  
						echo '<div class="succes">';  
						print('für: ');  
						print $row["sf_name"];  
						echo '</div>';  
						
						mysql_free_result($sf_check_OK);
						}
					   
					 }
					}