PHP & MySQL - Handpng NULL Example

You can use the if...else condition to prepare a query based on the NULL value.

The following example takes the tutorial_count from outside and then compares it with the value available in the table.

Example

Copy and paste the following example as mysql_example.php −


<html>
   <head>
      <title>Handpng NULL</title>
   </head>
   <body>
      <?php
         $dbhost =  localhost ;
         $dbuser =  root ;
         $dbpass =  root@123 ;
         $dbname =  TUTORIALS ;
         $mysqp = new mysqp($dbhost, $dbuser, $dbpass, $dbname);
         $tutorial_count = null;
         if($mysqp->connect_errno ) {
            printf("Connect failed: %s<br />", $mysqp->connect_error);
            exit();
         }
         printf( Connected successfully.<br /> );
   
         if( isset($tutorial_count )) {
            $sql =  SELECT tutorial_author, tutorial_count
               FROM  tcount_tbl
               WHERE tutorial_count =   + $tutorial_count;
         } else {
            $sql =  SELECT tutorial_author, tutorial_count
               FROM  tcount_tbl
               WHERE tutorial_count IS NULL ;
         }
         $result = $mysqp->query($sql);
           
         if ($result->num_rows > 0) {
            while($row = $result->fetch_assoc()) {
               printf("Author: %s, Count: %d <br />",
                  $row["tutorial_author"], 
                  $row["tutorial_count"]);               
            }
         } else {
            printf( No record found.<br /> );
         }
         $mysqp->close();
      ?>
   </body>
</html>

Output

Access the mysql_example.php deployed on apache web server and verify the output.


Connected successfully.
No record found.

PHP & MySQL - Handpng NULL Example

Example

Output

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