Get all products from english version - WooCommerce & WPML - php

Question

I'm developing a web application that works with WordPress database. In my website,(which works with WooCommerce and WPML) I have products in two languages - english (1st), serbian(2nd). I wrote an SQL code that get the products from database, with their regular and sale prices and etc., but I want to get ONLY products where lang = en (the products from english version). The problem is I don't know how to get them.
Simple SQL:
$sql = 'SELECT * from `wp_posts` WHERE post_type = product';
This is the method that SELECT from database:
// SELECT
public function select (
$table_1 = ' wp_posts ',
$table_2 = ' wp_postmeta ',
$rows = ' t1.id, t1.post_title, guid, post_type ',
$where = ' t1.post_status = "publish" AND t1.post_type = "product" OR t1.post_type = "product_variation" ',
$groupby = ' t1.ID, t1.post_title '
) {
// Connect to database and set charset
$this->connect();
$this->conn->set_charset('utf8');
// Published products
$sql = "SELECT $rows,
max(case when meta_key = '_regular_price' then t2.meta_value end) AS price,
max(case when meta_key = '_sale_price' then t2.meta_value end) AS sale,
max(case when meta_key = 'attribute_colors' then t2.meta_value end) AS colors,
max(case when meta_key = 'attribute_number' then t2.meta_value end)
FROM $table_1 AS t1
INNER JOIN $table_2 AS t2 ON ( t1.ID = t2.post_id )
WHERE $where
GROUP BY $groupby";
$result = mysqli_query($this->conn, $sql);
$published_products_count = mysqli_num_rows($result);
// Trashed products
$trashed_sql = "SELECT post_status FROM `wp_posts`
WHERE post_status = 'trash'";
$trashed_result = mysqli_query($this->conn, $trashed_sql);
$trashed_products_count = mysqli_num_rows($trashed_result);
// If results -> show them
if ($result) {
printf( "\t\t" . "<p>There are <strong>%d published</strong> products and <strong>%d trashed</strong>.</p>", $published_products_count, $trashed_products_count);
$table = '
<table class="pure-table pure-table-bordered">
<thead>
<tr>
<th>Row. №</th>
<th>ID</th>
<th>Product</th>
<th>Regular price</th>
<th>Sale price</th>
<th>Type</th>
<th>Edit</th>
</tr>
</thead>';
$row_number = 1;
while ($row = $result->fetch_assoc()) {
$table .= '
<tr>
<td>' . $row_number++ . '</td>
<td>' . $row["id"] . '</td>
<td>' . $row["post_title"] . '</td>
<td class="price">' . $row["price"] . '</td>
<td class="sale">' . $row["sale"] . '</td>
<td>' . $row["post_type"] . '</td>
<td>Edit</td>
</tr>';
}
$table .= '
</table>';
echo $table;
}
// If no results
else {
echo 'There isn't any products';
}
}
I hope somebody help me!
Thanks in advance! :)
P.S. The application is not based on WordPress!

Answer 1

WPML plugin creates several new tables to manage multilang, not affecting the standard WP posts tables. Specifically, it creates the wp_icl_translations table, where it stores relations between posts and languages.
You need to add two new JOIN statements to your query:
JOIN wp_icl_translations t ON wp_posts.ID = t.element_id AND t.element_type = 'post_product' JOIN wp_icl_languages l ON t.language_code=l.code AND l.active=1
Then, you can add a new condition to your WHERE statement like this:
AND t.language_code='en'
Hope this helps.
Regards.