(SQL Server) Fetch Full Email Given Email Header

When email headers are fetched using UIDs (not sequence numbers), then the resultant email object (containing only the header) will include auto-generated ckx-imap-* header fields to record information about the uid, attachments, etc. The IMAP UID of the email will be available in the "ckx-imap-uid" header. There will also be a "ckx-imap-isUid" header field having the value "YES" or "NO". If the email header was downloaded by UID, then "ckx-imap-isUID" will contain the value "YES" and the value of the "ckx-imap-uid" header field is the IMAP UID. If the "ckx-imap-isUID" header has a value of "NO", then the "ckx-imap-uid" header field represents the sequence number. (Sequence numbers of emails on the server can change over time, depending on whether emails are deleted. UIDs must be used to ensure that the correct full email is downloaded.)

The Chilkat Email object provides a GetImapUid method to return the UID from the ckx-imap-uid header. This can then be used to download the full email using the FetchSingle method. Assuming the UID is known, download a single email by UID from an IMAP mail server.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

-- Important: See this note about string length limitations for strings returned by sp_OAMethod calls.
--
CREATE PROCEDURE ChilkatSample
AS
BEGIN
    DECLARE @hr int
    DECLARE @iTmp0 int
    -- Important: Do not use nvarchar(max).  See the warning about using nvarchar(max).
    DECLARE @sTmp0 nvarchar(4000)
    -- This example requires the Chilkat API to have been previously unlocked.
    -- See Global Unlock Sample for sample code.

    DECLARE @imap int
    -- Use "Chilkat_9_5_0.Imap" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.Imap', @imap OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    -- Connect to an IMAP server.
    -- Use TLS
    EXEC sp_OASetProperty @imap, 'Ssl', 1
    EXEC sp_OASetProperty @imap, 'Port', 993
    DECLARE @success int
    EXEC sp_OAMethod @imap, 'Connect', @success OUT, 'imap.someMailServer.com'
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @imap, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @imap
        RETURN
      END

    -- Login
    EXEC sp_OAMethod @imap, 'Login', @success OUT, '***', '***'
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @imap, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @imap
        RETURN
      END

    -- Select an IMAP mailbox
    EXEC sp_OAMethod @imap, 'SelectMailbox', @success OUT, 'Inbox'
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @imap, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @imap
        RETURN
      END

    DECLARE @emailHeader int

    DECLARE @emailFull int

    DECLARE @uid int
    SELECT @uid = 2014
    DECLARE @isUid int
    SELECT @isUid = 1

    -- Fetch only the email header
    EXEC sp_OAMethod @imap, 'FetchSingleHeader', @emailHeader OUT, @uid, @isUid
    EXEC sp_OAGetProperty @imap, 'LastMethodSuccess', @iTmp0 OUT
    IF @iTmp0 = 1
      BEGIN

        -- Now fetch the full email
        DECLARE @uidFromCkxHeader int
        EXEC sp_OAMethod @emailHeader, 'GetImapUid', @uidFromCkxHeader OUT
        IF @uidFromCkxHeader < 0
          BEGIN
            -- Failed. 
            EXEC @hr = sp_OADestroy @emailHeader


            PRINT 'No ckx-imap-uid header was found.'
            EXEC @hr = sp_OADestroy @imap
            RETURN
          END
        EXEC sp_OAMethod @imap, 'FetchSingle', @emailFull OUT, @uidFromCkxHeader, 1
        EXEC sp_OAGetProperty @imap, 'LastMethodSuccess', @iTmp0 OUT
        IF @iTmp0 = 1
          BEGIN

            -- OK, we have the full email, do whatever we want...

            EXEC @hr = sp_OADestroy @emailFull

          END

        EXEC @hr = sp_OADestroy @emailHeader

      END

    -- Disconnect from the IMAP server.
    EXEC sp_OAMethod @imap, 'Disconnect', @success OUT

    EXEC @hr = sp_OADestroy @imap


END
GO