header_fields contains the values of most header fields in most messages, except address fields.
We'll use this example to explain the other fields:
From: email@example.com Subject: Historische Ölmühle Eberstedt To: firstname.lastname@example.org Date: 1 Apr 2007 12:13:13 +0200
In this header, the From and To fields are stored in address_fields and the Date and Subject fields in header_fields. (There is also a copy of Date in date_fields — this duplication enhances performance.)
The part column records to which MIME part this header field belongs. It's empty for the main header (the one seen above) and nonempty when a multipart message has headers on each part.
The position column is used to sort the entire message header. Subject has position 2 and Date 4.
The field column refers to
There is a field_names row for
Subject and one for
The value column contains the UTF-8 value of the header field. It is
Historische Ölmühle Eberstedt in the example
above, ie. not encoded using RFC 2047 or
create table header_fields ( -- Grant: select, insert id serial primary key, message integer not null, part text not null, position integer not null, field integer not null references field_names(id), value text, unique (message, part, position, field), foreign key (message, part) references part_numbers(message, part) on delete cascade );
The header_fields table was introduced in version 0.93.
In case of questions, please write to email@example.com.
Last modified: 2010-11-19