Hi @russell-jerseypost,

Allow User Variables allows you to utilize your user-defined variables in queries. When set to True, user variables (prefixed by an @) can be used in SQL queries. The default behavior is to treat identifiers prefixed with @ as command parameters.

If we take MySQL Workbench, for example, this is my current table:

I can use user-defined variables to select only the first record, like so:

The same logic applies to our MySQL driver. When the Allow User Variables is set to False, you will get this error (or a similar one):

When the Allow User Variables is set to True, we mimic the MySQL Workbench behavior:

Kindly refer to this documentation to learn more about User-Defined Variables: https://dev.mysql.com/doc/refman/8.0/en/user-variables.html

Thanks.

Is there a way to set user variables from xpath data or message headers?

Basically I'm looking to build a dynamic SELECT query.

So I have managed to do this with a combination of a Script connector which creates an XML message with start and end datetimes, and then using a MySQL Lookup Connector which uses XPATH variables in the Custom SQL WHERE clause.

<arc:set attr="output.filename" value="xmltriggerfile_eguid()].xml" />
<arc:set attr="output.filepath" value="=filepath]" />
<arc:set attr="output.data"><?xml version="1.0" encoding="UTF-8"?>
  <Schedule>
   <startDateTime>t_|now()|dateadd('day',-1, 'yyyy-MM-dd 00:00:00')]</startDateTime>
   <endDateTime>t_|now()|dateadd('day',-1, 'yyyy-MM-dd 23:59:59')]</endDateTime>
  <Results></Results>
</Schedule>      
</arc:set>

<arc:push item="output" />