用RecordSet实现分页by Daniel Adrian

Paging through a recordset

by Daniel Adrian

 

Skill level: Beginner

 

First posted: Monday, October 09, 2000

 

 

 

 

 

 Paging through a recordset



When I want to develop an application with a lot of records to show, I make pages so I can easily navigate

through the database and make the page look good and load quickly.



This can be done very easily. Shall we start?



Take a look at these next lines of code:



If Request.QueryString("Page") = "" Then

        Page = 1

    Else

        Page = Request.QueryString("Page")

    End If



    recordsToShow = 20

   n = 0

 





These lines of code are saying if the value of Request.QueryString("Page") is without any value then page

=1 else page gets the page the user requested. Recordstoshow is the number of lines in each page.

N is number of records printed.



Now lets put it into action:

objrs.PageSize = recordsToShow

 





(objrs is ADODB.Recordset Object)

 





In pagesize we are telling the record set that every page will have 20 records because recordstoshow is 20.



Now let’s pull out some records:



Do until objrs.EOF

if n = recordsToShow then

 exit do

 end if

write what that you want here

n=n+1

loop

 





Now we are writing date for the database and every time that we are repeating the loop we check if we done

it 20 times some when it’s 20 we will stop the loop.



Now let’s write the navigation:



if Page <> 1 then

 Response.Write ""

 end if

Response.Write "<< Back "



   if Page <> 1 then

   Response.Write ""

   end if



'-------------------------

  For intCount = 1 to objRs.PageCount

   

   If intCount = 1 then

      Response.Write " | "

   End If

   

   If cint(intCount) = cint(Page) then

      Response.Write "" & intCount & "| "

   Else

 Response.Write "" & intCount & " | "

   End If

   

Next

'-------------------------

 if cint(page) = cint(objRs.PageCount) then

 Response.Write ""

 end if

 Response.Write " Next >> "

 if cint(Page) = cint(objRs.PageCount) then

 Response.Write ""

 end if

 





First we are checking if the current page is not 1 so it’s more then one so we can go back.



After this we need to write all of the pages in the record set.

Now we need to check if we can do next.



That is all! Yes it’s that easy!