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Implements Session Parameters.





A SessionParam is a parameter that can modify MDX and SQL queries. The
parameters are held in a SessionParamPool. There is one pool per HttpSession.

SessionParam may be created in several ways:

  by some application logic. For example at login-time there may be some parameters
      that restrict the data a user is allowed to see
  by clicking on a member in the JPivot table
  by clicking on a hyperlink {@link net.sf.wcfart.wcf.param.ParamLinkTag} 


Parameters may be used in sql queries. Example for JSTL's sql tag:
<wcf:paramPool/>

<sql:query var="result" dataSource="${myDataSource}">
  SELECT ...
  FROM CUSTOMERS T1, ...
  WHERE <wcf:paramSql param="CUSTOMERID" qname="T1.CUSTOMER_PK"/>
</sql:query>


See unit tests and paramtest.jsp for more examples.