PHP我的管理员没有忽略用于导入CSV文件的重复行选项[重复]

I have a CSV file that I successfully imported into a database table.

Over time I will update this CSV file with new data so I was wondering if I import the same file which will contain rows that has already been inserted into the table, is there a way to avoid duplicates being added again?.

When researching I came across an option called "Ignore duplicate rows" however this is not present for me within the import options.

I am using the PHP my admin that is packaged inside XAMPP.

which is •Version information: 4.2.7.1, latest stable version: 4.2.8

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add unique key to your database column which you think should be unique

here is the code i have done for uploading csv files which will stop inserting found values maybe it will help you.

using On Duplicate Key Update

<?php
$conn=mysql_connect("localhost","root","");
$db=mysql_select_db("dbname");


 $csv_file="/path/to/file";
 $savefile="filename.csv";
 $handle = fopen($csv_file, "r");

$i=0;
while (($data = fgetcsv($handle, 1000, ",")) !== FALSE) { //2nd param is for memory limit use it if u know what u are doing
    if($i>0){

        $import="INSERT into table_name(col0,col1,col2,col3)values('".addslashes($data[0])."','".addslashes($data[1])."','".addslashes($data[2])."','".addslashes($data[3])."')ON DUPLICATE KEY UPDATE col2= '".addslashes($data[1])."'";
        mysql_query($import) or die(mysql_error());
    }
    $i=1;
}   
?>   

cheers