====== pears.PersonAvailableAtTime ======
<WRAP center round info>
Generated schema reference. Regenerate this page from the SQL unload; keep hand-maintained business notes in the narrative namespace.
</WRAP>

===== Original SQL =====
<code sql>
create function "pears"."PersonAvailableAtTime"( 
  /* Application Maintained Function / Procedure - DO NOT EDIT*/
  in "sPersonid" char(20),in "dShiftDate" date,in "tShiftFrom" time,in "tShiftTo" time,in "iCheckExplicitlyAvailable" smallint ) 
returns char(1)
begin
  declare "foundState" char(1);
  set "foundstate" = null; -- If we return null, we have found no explicit unavailability or availability
  -- First check for all day unavailability
  select first "state" into "foundstate" from "tempshift" where "state" not in( 'A','C' ) 
    and "personid" = "spersonid" and "shiftdate" = "dshiftdate" and("timefrom" is null or "timeto" is null);
  if "foundstate" is null then -- Look for non-concurrent employments
    select first 'W' into "foundstate" from "employment"
      where "isnull"("concurrent",0) = 0 and "personid" = "spersonid" and "startdate" <= "dshiftdate" and("leavedate" is null or "leavedate" >= "dshiftdate")
  end if;
  if "foundstate" is null then
    set "foundstate" = "personavailableforplaniterate"("spersonid","dshiftdate","tshiftfrom","tshiftto","icheckexplicitlyavailable",'')
  end if;
  return "foundstate"
end
</code>