Solved

Cannot work after page it

Posted on 2009-05-18
2
205 Views
Last Modified: 2012-05-07
I have a sql statement, it can work properly as below SQL1.

I need to page it though a page function PAGE. The PAGE works properly for all the other sqls.

But the new page SQL2 select no results.

Any suggestion?

SQL1:
select ack, Date, [Time], Region, Station, Panel, Phase, VoltageLevel, [Value],  Comments
 from
gensum left join comment ON gensum.commentkey=comment.comment_id where ((Date>'2008-05-18' or (Date='2008-05-18' and Time>'00:00:00')) and (Date<'2009-05-18' or (Date='2009-05-18' and Time<'18:36:06')))

SQL2
returnpage 'select ack, Date, [Time], Region, Station, Panel, Phase, VoltageLevel,
[Value],
Comments
 from
gensum left join comment ON gensum.commentkey=comment.comment_id where ((Date>''2008-05-18'' or (Date=''2008-05-18'' and Time>''00:00:00'')) and (Date<''2009-05-18'' or (Date=''2009-05-18'' and Time<''18:36:06'')))', 'Date asc, Time asc, gensumid asc', 1, 26
PAGE function:
set ANSI_NULLS ON
set QUOTED_IDENTIFIER ON
GO
ALTER PROCEDURE [dbo].[ReturnPage](@Select varchar(8000), @OrderBy varchar(8000), 
                            @StartRow int, @EndRow int)
AS
BEGIN
declare @ColList varchar(8000);
declare @Where varchar(8000);
declare @i int;  
declare @i2 int;
declare @tmp varchar(8000);
declare @dec varchar(8000);
declare @f varchar(1000);
declare @d varchar(1000);
declare @Symbol char(20);
declare @SQL varchar(8000);
declare @Sort varchar(8000);
 
set @Sort = @OrderBy + ', '
set @dec = ''
set @Where  = ''
set @SQL = ''
set @i = charindex(',' , @Sort)
 
while @i != 0
 begin
  set @tmp = left(@Sort,@i-1)
  set @i2 = charindex(' ', @tmp)
  set @f = ltrim(rtrim(left(@tmp,@i2-1)))
  set @d = ltrim(rtrim(substring(@tmp,@i2+1,100)))
  set @Sort = rtrim(ltrim(substring(@Sort,@i+1,100)))
  set @i = charindex(',', @Sort)
  set @symbol = case when @d = 'ASC' then '>' else '<' end + 
                case when @i=0 then '=' else '' end
 
  set @dec = @dec + 'declare @' + @f + ' sql_variant; '
  set @ColList = isnull(replace(replace(@colList,'>','='),'<','=') + ' and ','') +
                 @f + @Symbol + ' @' + @f
  set @Where = @Where + ' OR (' + @ColList + ') '
  set @SQL = @SQL + ', @' + @f + '= ' + @f
 end
 
set @SQL = @dec + ' ' +
           'SET ROWCOUNT ' + convert(varchar(10), @StartRow) + '; ' +
           'SELECT ' + substring(@SQL,3,7000) + ' from (' + @Select + ') a ORDER BY ' +
           @OrderBy + '; ' + 'SET ROWCOUNT ' + 
           convert(varchar(10), 1 + @EndRow - @StartRow) + '; ' +
           'select * from (' + @Select + ') a WHERE ' + 
           substring(@Where,4,7000) + ' ORDER BY ' + @OrderBy + '; SET ROWCOUNT 0;'
 
exec(@SQL)
END

Open in new window

0
Comment
Question by:turbot_yu
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
2 Comments
 
LVL 32

Accepted Solution

by:
bhess1 earned 500 total points
ID: 24497536
You may be better off with a function using the SQL 2005 ROW_NUMBER() functionality.  Consider your original query to your paging function:

returnpage 'select ack, Date, [Time], Region, Station, Panel, Phase, VoltageLevel,
[Value],
Comments
 from
gensum left join comment ON gensum.commentkey=comment.comment_id where ((Date>''2008-05-18'' or (Date=''2008-05-18'' and Time>''00:00:00'')) and (Date<''2009-05-18'' or (Date=''2009-05-18'' and Time<''18:36:06'')))', 'Date asc, Time asc, gensumid asc', 1, 26

This could be subsumed as a stored procedure, using ROW_NUMBER(), and be easily executed - example:

CREATE PROCEDURE ReturnPage
    @Fields varchar(2000),
    @FromWhere varchar(4000),
    @Order varchar(1024),
    @Page int,
    @RowsPerPage int
AS
    DECLARE @sql varchar(8000)
    SET @sql = 'WITH rs AS (SELECT ' + @Fields + ', ROW_NUMBER() OVER (ORDER BY ' + @Order + ') AS wkrnx ' + @FromWhere + ') SELECT ' + @Fields + ' FROM rs WHERE wkrnx BETWEEN ' + Cast((Page - 1) * @RowsPerPage + 1 as varchar(10)) + ' AND ' + Cast(Page * RowsPerPage as Varchar(10))'

EXEC (@sql)

EXEC ReturnPage, 'ack, Date, [Time], Region, Station, Panel, Phase, VoltageLevel, [Value],  Comments', 'FROM gensum
LEFT JOIN comment
      ON gensum.commentkey=comment.comment_id
WHERE (Date>'2008-05-18' or (
            Date='2008-05-18'
            and Time>='00:00:00'            -- What handles time 0 exactly?  Use gt or eq here
            )
      ) and (Date<'2009-05-18' or (
            Date='2009-05-18'
            and Time<'18:36:06'
            )
      )', 'Date asc, Time asc, gensumid asc', 1, 26

Granted, you must break up the source query a bit more, but the execution should be quicker, and the understandability of the code is increased quite a bit.
0
 
LVL 32

Assisted Solution

by:bhess1
bhess1 earned 500 total points
ID: 24497548
I wish I could edit comments.  Sigh

The section of SQL through EXEC (@sql) is the stored procedure.  The SQL below that is an invocation of that stored procedure.
0

Featured Post

Free eBook: Backup on AWS

Everything you need to know about backup and disaster recovery with AWS, for FREE!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Table create permissions on SQL Server 2005 9 45
SQL DATE Past due to current wek 4 22
What is GIS method of Geometry data type? 6 36
relocating SQL 2000 18 38
When writing XML code a very difficult part is when we like to remove all the elements or attributes from the XML that have no data. I would like to share a set of recursive MSSQL stored procedures that I have made to remove those elements from …
This article explains how to reset the password of the sa account on a Microsoft SQL Server.  The steps in this article work in SQL 2005, 2008, 2008 R2, 2012, 2014 and 2016.
How to Install VMware Tools in Red Hat Enterprise Linux 6.4 (RHEL 6.4) Step-by-Step Tutorial

751 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question