Question

I need to add some records to a table, but only those that match a certain linked table.
There are three tables are as follows:

extension_prefs (extension_id, value, parameter)
extension (id, client_id)
client (id, parent_client_id)

These will link as follows:

extension_prefs.extension_id = extension.id AND extension.client_id = client.id

I need to insert 4 records into extension_prefs for every extension belonging to a client with a specific parent_client_id. I have no idea of the syntax to achieve this although I have the feeling its quite straightforward.

EDIT: Yes I messed this up, these records need to be UPDATED not INSERTED.

Thanks very much

George

Answer 1

You can call the following query for each of the preferences and it will be saved for all the necessary extensions.

Updated:
The following query inserts a new row for the preference or if it exists then updates the existing one.
This assumes that the extension_prefs table has a unique constraint on the extension_id and parameter columns.

INSERT INTO extension_prefs (extension_id, parameter, value)
  SELECT e.id, "key", "value"
   FROM extension e
   JOIN client c ON e.client_id = c.id
   WHERE c.parent_client_id = 123
ON DUPLICATE KEY
  UPDATE value = "value"