[Catalyst] How to show SQL in apache error_log?

[Cookie]

As we know,if we use export DBIC_TRACE=3D1 and then we run the
myapp_server.pl,we can see the sql from the stander output.
I want to show the sql in the apache error_log.I modify the httpd.conf file
like this:
setenv DBIC_TRACE 1
But it seems useless.How can solve this problem?
Thanks.
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