HTML Template Email Queue Tables

T_TEMPLATE_QUEUE and T_TEMPLATE_QUEUE_PARAMETER are likely to appear in the next version of the Table Structures document, but until they do, here are some tips:

Known Values of T_TEMPLATE_QUEUE.status:

• 0: Pending
• 1: Sent successfully
• -1: Failed with error

Practical takeaway: if you want to use T_TEMPLATE_QUEUE as state, by querying it to exclude orders that have already received a certain template, make sure your exclusion filters on status <> -1 instead of status = 1.

If you are queuing emails by inserting directly to these tables, AND YOU NEED TEMPLATE PARAMETERS, you have a couple of coding considerations:

• T_TEMPLATE_QUEUE_PARAMETER is foreign-keyed on the identity column of T_TEMPLATE_QUEUE
• rows in both of these tables are required for your template to send successfully, so you can't allow the TPS to pick up a T_TEMPLATE_QUEUE row before you've added the matching parameter rows.

The correct coding conventions to accommodate these requirements are to insert to both tables in an explicit transaction, and to use an INSERT-OUTPUT clause to get the generated identity IDs. Here is an example:

BEGIN TRANSACTION;

CREATE TABLE #inserted (

  id int,

  reference_no int,

);

INSERT dbo.T_TEMPLATE_QUEUE

      (template_no, email_profile_no, request_userid, request_usergroup, email_address, reference_no)

  OUTPUT INSERTED.id, INSERTED.reference_no INTO #inserted

SELECT template_no, email_profile_no, request_userid, request_usergroup, email_address, reference_no

  FROM #inserting;

WITH inserted_keyed AS (

  SELECT

      template_queue_id = id,

      reference_no,

      order_sli_key = ROW_NUMBER() OVER (PARTITION BY reference_no ORDER BY id)

    FROM #inserted

), inserting AS (

  SELECT

      k.template_queue_id,

     [name] = 'sli_no',

     [value] = CONVERT(varchar, i.sli_no)

    FROM inserted_keyed k

      JOIN #inserting i

        ON k.reference_no = i.reference_no

          AND k.order_sli_key = i.order_sli_key

)

INSERT dbo.T_TEMPLATE_QUEUE_PARAMETERS

      (template_queue_id, [name], [value])

SELECT template_queue_id, [name], [value]

  FROM inserting;

COMMIT TRANSACTION;