MaxScale 24.08 Beta Comment Filter
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Comment Filter
Overview
With the comment filter it is possible to define comments that are injected before the actual statements. These comments appear as sql comments when they are received by the server.
[MyComment] type=filter module=comment inject="Comment to be injected" [MyService] type=service router=readwritesplit servers=server1 user=myuser password=mypasswd filters=MyComment
Filter Parameters
The Comment filter requires one mandatory parameter to be defined.
inject
A parameter that contains the comment injected before the statements. There is also defined variable $IP that can be used to comment the IP address of the client in the injected comment. Variables must be written in all caps.
Examples
Example 1 - Inject IP address of the connected client into statements
as comment.
The following configuration adds the IP address of the client to the comment.
[IPComment] type=filter module=comment inject="IP=$IP" [MyService] type=service router=readwritesplit servers=server1 user=myuser password=mypasswd filters=IPComment
In this example when MaxScale receives statement like:
SELECT user FROM people;
It would look like
/* IP=::ffff:127.0.0.1 */SELECT user FROM people;
when received by server.
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