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    Stop duplicate entry into database

    11th March 2014

    MySql

    mysql codehaven category

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    <?php
    $newtag = mysql_real_escape_string($_POST['newtag']);
    $query = "SELECT tagname FROM tags WHERE tagname = '$newtag'";
    $result = mysql_query($query);
    if ( mysql_num_rows ( $result ) > 0 )
    {
        /* Username already exists */
        echo 'Tag already exists';
    }
    else
    {
    /* insert it */
      $query = "INSERT INTO tags (tagname) VALUES ('$newtag')";  
    mysql_query($query) or die(mysql_error());
    }
    ?>
     

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