以CSV格式导出所选行并导回相同的CSV文件以更新PHP / MySQL中的选定行

Question

I have a mysql table with following columns:

filterid    productid   value   groupid

I want to export the rows of this table (Only selected rows) to a CSV file. I know how to do the exporting part.

For example, if I have exported the rows based on product ID, let say exported rows are:

4   13307   USA|Quebec|Rest of Canada   750
9   15963   USA|Quebec|Rest of Canada   1
9   13618   USA|Quebec|Rest of Canada   1
9   16210   USA|Quebec|Rest of Canada   1
9   16666   USA|Quebec|Rest of Canada   1

Out of total 100 rows.

Now, I have exported this content into a CSV file and want to import it back to my mysql table where it should update only rows matching with the product id's which are in my exported CSV file without disturbing rest of the table content.

Is it possible to do that?

After googling, what I found is that I can import a CSV to a table using this code

LOAD DATA LOCAL INFILE 'filename.csv' INTO TABLE my_table FIELDS
TERMINATED BY ',' 
ENCLOSED BY '' 
LINES TERMINATED BY '\n'

Please suggest a way to achieve this.

I can provide you with more sample code if you need.

Thank You!

Answer 1

I think he was asking the question because he didn't know how to use INFILE with a WHERE clause:

Now, I have exported this content into a CSV file and want to import it back to my mysql table where it should update only rows matching with the product id's which are in my exported CSV file without disturbing rest of the table content.

If you want to use a script to do what you mentioned, you can try the following:

// set up your database connection
$fp = fopen('your_csv_file.csv','r') or die("**! can't open file\n\n");

// loop through your lines
while($csv_line = fgetcsv($fp,1024)) {

    $filterid = $csv_line[0];
    $productid = $csv_line[1];
    $value = $csv_line[2];
    $groupid = $csv_line[3];

    $update =  "UPDATE your_table(filterid, productid, value, groupid) ";
    $update .= "VALUES('$filterid', '$productid'; '$value'; '$goupid') WHERE productid='$productid'";

    // run $update on your database
}

fclose($fp) or die("**! can't close file\n\n");

It should at least point you in the right direction..