I couldn't able to get attribute values from woocommerce taxonomy. I have tried
select meta_value from wp_postmeta where meta_key = '_product_attributes' and post_id = '55';
It gives an array
a:1:{s:13:\"pa_size-value\";a:6:{s:4:\"name\";s:13:\"pa_size-value\";s:5:\"value\";s:0:\"\";s:8:\"position\";s:1:\"0\";s:10:\"is_visible\";i:1;s:12:\"is_variation\";i:1;s:11:\"is_taxonomy\";i:1;}}
With these array values having attribute value as null, i dono how to proceed. I creating a custom code, not with woocommerce functions.
Could you mention how to walk around with woocommerce taxonomy? and process flow to display attribute values?