handling of input rows that duplicate existing rows

According to MySQL manual (http://dev.mysql.com/doc/refman/5.0/en/load-data.html), you can control the process of replcing/ignoring of duplicated rows:

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The REPLACE and IGNORE keywords control handling of input rows that duplicate existing rows on unique key values:

* If you specify REPLACE, input rows replace existing rows. In other words, rows that have the same value for a primary key or unique index as an existing row. See Section 11.2.6, “REPLACE Syntax”.

* If you specify IGNORE, input rows that duplicate an existing row on a unique key value are skipped. If you do not specify either option, the behavior depends on whether the LOCAL keyword is specified. Without LOCAL, an error occurs when a duplicate key value is found, and the rest of the text file is ignored. With LOCAL, the default behavior is the same as if IGNORE is specified; this is because the server has no way to stop transmission of the file in the middle of the operation.
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To make this happen, find this code in the class file:

$sql = "LOAD DATA INFILE '".@mysql_escape_string($this->file_name).
"' INTO TABLE `".$this->table_name.

Add REPLACE or IGNORE keyword before INTO TABLE like this:

$sql = "LOAD DATA INFILE '".@mysql_escape_string($this->file_name).
"' REPLACE INTO TABLE `".$this->table_name.

Of course you should have unique keys on this table (or PRIMARY KEY).

P.S. I think I'll add such option to the next release of the class.