SPQuery + CAML, problems with 2000 items limit

Hi Guys!

I have a MOSS 2007 site that is used for Resource Reservation.

At this site there's a list for resources, reservations, and many others as needed. I also have all forms and Dataviews is needed to get a better usability.

So, to don't allow the same resource to be reserved at a conflicting schedule, I created the following Event Receiver to validate this condition:

                using (SPSite oSPSite = new SPSite(properties.WebUrl))
                {
                    SPWeb oSPWeb = oSPSite.OpenWeb();
                    SPList oSPList = oSPWeb.Lists["Reservations"];
                    SPQuery oSPquery = new SPQuery();

                    // Query used to compare input (Resource, StartTime, EndTime) data with list data.
                    oSPquery.Query = "<Where><Or><And><Eq><FieldRef Name='Resource' LookupId='TRUE' /><Value Type='Lookup'>" + properties.AfterProperties["Resource"] + "</Value></Eq><And><Leq><FieldRef Name='StartDateTime' /><Value IncludeTimeValue='TRUE' Type='DateTime'>" + properties.AfterProperties["StartDateTime"] + "</Value></Leq><Geq><FieldRef Name='EndDateTime' /><Value IncludeTimeValue='TRUE' Type='DateTime'>" + properties.AfterProperties["EndDateTime"] + "</Value></Geq></And></And><And><Eq><FieldRef Name='Resource' LookupId='TRUE' /><Value Type='Lookup'>" + properties.AfterProperties["Resource"] + "</Value></Eq><And><Lt><FieldRef Name='StartDateTime' /><Value IncludeTimeValue='TRUE' Type='DateTime'>" + properties.AfterProperties["EndDateTime"] + "</Value></Lt><Gt><FieldRef Name='EndDateTime' /><Value IncludeTimeValue='TRUE' Type='DateTime'>" + properties.AfterProperties["StartDateTime"] + "</Value></Gt></And></And></Or></Where>";
                    SPListItemCollection oListItemColl = oSPList.GetItems(oSPquery);
                    
                    // By this CAML filter, if there's a resource reserved at the same time range, it will be blocked!
                    if (oListItemColl.Count > 0)
                    {
                        properties.Cancel = true;
                        properties.ErrorMessage = "The selected resource was previously reserved by another user for the same date and time period. Please select another resource, or choose another date/ time.";
                    }
                }
            }

I take a look to some msdn documents like this one:

http://msdn.microsoft.com/en-us/library/microsoft.sharepoint.spquery.rowlimit.aspx

But when I implement a query recursion by ListItemCollectionPosition, it isn't working as I need.

(I tried to remove the CAML query and it was worked fine - querying all items).

By this way, I have the impression if I use the CAML query + recursion suggested above, it will only query the first 2000 items.

How's the better way to solve this problem?

Ps: beginner developer :D

Thanks!!

Tarcísio Gambin | MCP, MCTS, MCITP, ITILv3
www.tarcisiogambin.net