 data, <i>e.g.</i>:
<pre>
  SQLNamedQuery get-user-salt SELECT "salt FROM user_salts WHERE user_name = '%{0}'"
  SQLPasswordUserSalt sql:/get-user-salt
</pre>

<p>
When using salted passwords, some systems will <i>prepend</i> the salt as a
prefix to the data, and others will <i>append</i> the salt as a suffix.  The
optional second parameter to <code>SQLPasswordUserSalt</code> controls how
this module will use the salt:
<pre>
  SQLPasswordUserSalt name Prepend
  SQLPasswordUserSalt sql:/get-user-salt Prepend