We have currently stored EAN codes of products in meta data field which was used by another plugin. I need to copy all this data from our variable products to the new barcode field. How to do it? It is impossible to do it manually
We plan to add support for exporting/importing barcodes from any meta key to ATUM barcode by using our ATUM Export PRO add-on. But, for now, if you don't want to do this manually, a script could be created with SQL to do the conversion.
Do you know which is the name of the meta key you are currently using for your barcodes?
If the barcode is not stored in meta data it will be probably very difficult to use the field to populate product feeds. Am I right?
This would depend on the plugin or system you are using to generate your feeds, of course. And whether that system is able to read only data from meta keys or is able to read data from custom tables too. If not able, you can find another or find a developer to improve it to allow exporting ATUM barcodes to your feeds.
In the end, being a meta key or a column within a custom table is very similar. Just stored in separate tables. But custom tables are more performant for sites with a huge postmeta table.