CODEWITHSUNDEEP
sqloracle-databasestored-procedures
PANKAJ 786
PANKAJ 786

Reputation: 129

Paging and sorting using a stored procedure in oracle

I have created a stored procedure for paging. Now I am looking for column sorting.

My working paging stored procedure:

PROCEDURE paging (PageSize     IN     INT,
                  PageIndex    IN     INT,
                  SortColumn   IN     VARCHAR,
                  PageData        OUT Page) AS
    FirstIndex   INT;
    LastIndex    INT;
    SortCol      VARCHAR;
BEGIN
    LastIndex := PageSize * (PageIndex + 1);
    FirstIndex := LastIndex - PageSize + 1;
    SortCol := SortColumn;

    OPEN PageData FOR
        SELECT *
          FROM (SELECT a.*, ROWNUM AS rnum
                  FROM (  SELECT *
                            FROM table_name
                        ORDER BY SortCol) a
                 WHERE ROWNUM <= LastIndex)
         WHERE rnum >= FirstIndex;
END paging;
/

Upvotes: 5

Views: 7330

Answers (2)

Jitender Kumar
Jitender Kumar

Reputation: 2587

This SP alone doing all the three things in Oracle, Paging, Sorting and Filtering of records.

create or replace procedure GetResults 
(
 p_userId In Number,
 p_dueDateFrom In Date,
 p_dueDateTo in Date,
 p_durationMax in Number,
 p_durationMin in Number,
 p_sortColumn In Varchar2,
 p_sortOrder In Varchar2,
 p_pageSize In Number,
 p_pageIndex in number,
 cv_1 OUT SYS_REFCURSOR
)
as 
v_FirstIndex   NUMBER;
v_LastIndex    NUMBER;
begin
-- Paging
  v_LastIndex := p_pageSize * (p_pageIndex + 1);
  v_FirstIndex := v_LastIndex - p_pageSize + 1;

 OPEN cv_1 FOR 

  SELECT * FROM (SELECT a.*, ROWNUM AS rnum
              FROM (Select * From Newjob nj Where nj.userId = p_userId  
               -- Filtering
             And ((p_dueDateFrom IS NULL AND p_dueDateTo Is NULL) OR 
                  (nj.Due_Date >= p_dueDateFrom and nj.Due_Date <= p_dueDateTo)
                 )
             And ((p_durationMax IS NULL AND p_durationMin Is NULL) OR 
                  (nj.Duration >= p_durationMax and nj.Duration <= p_durationMin)
                 )   
             -- Sorting     
            order by   
            Case when p_sortOrder = 'Ascending' And p_sortColumn = 'DUE_DATE' then  nj.Due_Date End,
            Case When p_sortOrder = 'Ascending' And p_sortColumn = 'DURATION' then nj.DURATION end,     
            Case when p_sortOrder = 'Descending' And p_sortColumn = 'DUE_DATE' then  nj.Due_Date End desc,
            Case When p_sortOrder = 'Descending' And p_sortColumn = 'DURATION' then nj.DURATION end desc)a
   WHERE ROWNUM <= v_LastIndex)    
   WHERE rnum >= v_FirstIndex;
end;

Upvotes: 3

Rachcha
Rachcha

Reputation: 8816

I would suggest you make use of a wonderful feature called Dynamic SQL (Oracle Docs).

I have also modified your SQL query and used ROW_NUMBER() instead of rownum. It is a more robust method of ordering and numbering the output rows than the latter.

I have also removed a few variables that I don't think were needed from your PL/SQL:

PROCEDURE paging (PageSize     IN     INT,
                  PageIndex    IN     INT,
                  SortColumn   IN     VARCHAR2, -- Assuming this always contains
                                                -- the ordering column name
                  PageData        OUT Page) AS
    FirstIndex   INT;
    LastIndex    INT;
    v_sql        VARCHAR2(4000);
BEGIN
    LastIndex := PageSize * (PageIndex + 1);
    FirstIndex := LastIndex - PageSize + 1;

    v_sql :=  'SELECT *'
            ||'  FROM (SELECT a.*,'
            ||'              ROW_NUMBER() '
            ||'                OVER (ORDER BY ' || SortColumn || ') AS rnum'
            ||'          FROM table_name a)'
            ||' WHERE rnum BETWEEN FirstIndex AND LastIndex';

    OPEN PageData FOR v_sql;

END paging;
/

Upvotes: 4

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