Passing Params & Formulas to SQL Command & Strd Proc in CR 11.5 & 2008 - 1

Question

I am working with CR 11.5 and heavily use SQL Command rewrites and Stored Procedures (SPs)with the usual limitation that only single parameter values can be passed into SPs, and Parameters must be created within the SQL Command editor (and cannot be referenced to those generated in Field Explorer, or can they?)
I understand from BE/CR's sales material for CR 2008 that multiple values can now be used under these conditions.  As I recall, Multivalue Parameters are actually arrays that can be made into comma delimited strings.
Local StringVar StringExpression;
Local NumberVar ArrayCount := Count({?Code});
Local NumberVar i;
if ArrayCount = 0
   then StringExpression := ""
else
   StringExpression := {?Code}[1];
   i := 2; 
While i <= ArrayCount Do
    StringExpression := StringExpression + ", " + {?Code}<i>;
    i := i + 1;
See part 2 for continuation....

Answer 1

Here is my use case (since most of my reports are against very large databases, running "tuned" SQL Commands is essential).
SELECT
  PERSON.PatientName,
  PROBLEM.Code,
  PROBLEM.Description
  LASTLABS.HDID,
  RPTOBS.ObsDate,
  RPTOBS.ObsValue
FROM
  ((PERSON INNER JOIN
    PROBLEM ON
        PERSON.PId = PROBLEM.PId) LEFT OUTER JOIN
     LASTLABS ON
     (PERSON.PId = LASTLABS.PId AND
      LASTLABS.HDID IN (28, 53, 67, 102) LEFT OUTER JOIN      -- Paramaterize
    RPTOBS ON
     (LASTLABS.HDID = C.HDID AND
      LASTLABS.MaxObsDate = RPTOBS.ObsDate AND
      LASTLABS.PId = RPTOBS.PId AND
      RPTOBS.Change IN (2, 5, 7))                             -- Paramaterize
WHERE
    (PROBLEM.Code LIKE '249%' OR                              -- Paramaterize
     PROBLEM.Code LIKE '250%' OR                              -- Paramaterize
     PROBLEM.Code IN ('V77.1', 'V80')                         -- Paramaterize
What I am looking for is a Parameterized form as follows....
SELECT
  PERSON.PatientName,
  PROBLEM.Code,
  PROBLEM.Description
  PROBLEM.Qualifier,
  LASTLABS.HDID,
  RPTOBS.ObsDate,
  RPTOBS.ObsValue
FROM
  ((PERSON INNER JOIN
    PROBLEM ON
        PERSON.PId = PROBLEM.PId) LEFT OUTER JOIN
    LASTLABS ON
     (PERSON.PId = LASTLABS.PId AND
      LASTLABS.HDID ({?HDID_In_Param}) LEFT OUTER JOIN          -- Paramaterize
    RPTOBS ON
     (LASTLABS.HDID = RPTOBS.HDID AND
      LASTLABS.MaxObsDate = RPTOBS.ObsDate AND
      LASTLABS.PID = RPTOBS.PID AND
      RPTOBS.Change ({?Change_In_Param}))                       -- Paramaterize
WHERE
    (PROBLEM.Code {?Code_Like_Param} OR                         -- Paramaterize
     PROBLEM.Code {?Code_In_Param})                             -- Paramaterize
Is this possible? Has it been thought of yet. Has passing in well-constructed @formulas been considered?