numParameters should be optional for jdbc queries

<search>
<searchType>searchSubject</searchType>
<param>
<param-name>numParameters</param-name>
<param-value>1</param-value>
</param>
<param>
<param-name>sql</param-name>
<param-value>select * from Subject where (subjectId=?)</param-value>
</param>
</search>

There is very little chance the the number of question marks does not equal the numParameters. This param is common to get messed up, so it should be optional, and default to the number of question marks.

Chris