This article outlines the database structure for the MMv4 product_field_data database table. This table contains the data associated with any custom product fields that have been created.

For example, if a custom product field has been created to record the product's custom engraving, then this table will include an entry recording the text each customer has selected.

• id
  Primary Key of the table.
  int(10) | unsigned | auto increment | primary key | indexed
• container_id
  Reference to the product_field.id that this node is associated with.
  int(10) | unsigned | indexed
• content
  This is the actual value that is selected or input by the user when the form field was submitted.
  text
  
• object_id
  Reference to the object (in this case, the order_item.id) that this record is associated with.
  int(10) | unsigned | indexed