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preventing duplicates


manhattes
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I am reading an RSS feed and sometimes I pull in duplicates of data.


$citable= "INSERT INTO TableName (Company, Form, Date, Link) 
VALUES ('" . $FnumI ."',' " . $Form ."','" . $msqldate ."','" . $Flink ."')
ON DUPLICATE KEY UPDATE
Company='" . $FnumI ."', Form='" . $Form ."', Date='" . $msqldate ."', Link='" . $Flink ."'";	

Is there a way I can only record the data if Link does not exist?

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Do a query for 'link' before you try the insert?

 

PS - you can simplify your current syntax with this:

$citable = "insert into TableName (Company, Form ,Date, Link)

values('$fnumI', '$form', '$msqldate', '$Flink');

 

Plus - I believe that 'Date' is a reserved word. Try re-naming that column to make your future use of this table less problematic.

 

Also - you should be sanitizing these inputs. Try using a prepared query instead of this method.

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What do you mean do a query for link? How can I do the query for an incoming link before its in the table?

 

Do a query for 'link' before you try the insert?

PS - you can simplify your current syntax with this:
$citable = "insert into TableName (Company, Form ,Date, Link)
values('$fnumI', '$form', '$msqldate', '$Flink');

Plus - I believe that 'Date' is a reserved word. Try re-naming that column to make your future use of this table less problematic.

Also - you should be sanitizing these inputs. Try using a prepared query instead of this method.

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