Mysql查询并查找是否存在值

Question

I got this code to compare and find differences between 2 CSV files (with 1 column each and 1 EAN code per line) with array_diff in both direction:

<?php 
mysql_connect('LOCALHOST', 'db', 'passwd') or die(mysql_error()); 
mysql_select_db("db") or die(mysql_error()); 

$update_table = "ps_product"; 

$file1 = file('1.csv');
$file2 = file('2.csv');


$diff  =  array_diff($file1, $file2);
$diff2  = array_diff($file2, $file1);


$diffjoined = array_merge($diff, $diff2);

?>

Now I have to know if in the merged array, there are corresponding values inside the db and then set quantity to 0:

    If "a value inside array ($diffjoined) was found in DB"
  foreach "ean code found in DB"

mysql_query ("UPDATE $update_table SET quantity='0' WHERE ean13 IN ($diffjoined) ");

Answer 1

I'm assuming that your $diffjoined is a list of ean13's from your code.

Your SQL query is close

$eans = "'".implode("','", $diffjoined)."'";
$q = "UPDATE $update_table SET quantity='0' WHERE ean13 IN ($eans)";
mysql_query($q);