Oracle stored procedure-Paging

Create or replace package body "p_page" is
Procedure per_quickpage
(
Tbname in varchar2, -- table name
Fieldstr in varchar2, -- field set
Rowfilter in varchar2, -- filter Condition
Sortstr in varchar2, -- sorting set
Pagesize in number, -- page size
Pageindex in number, -- page number
Totalcount out number, -- total number of records
Cur_returncur out t_cursor
)
Is
V_sourcetb1 varchar2 (32000); -- Dynamic table name 1
V_sourcetb2 varchar2 (32000); -- Dynamic table name 2
V_sourcetb3 varchar2 (32000); -- Dynamic table name 3
V_sourcetb4 varchar2 (32000); -- Dynamic table name 4
V_totalcount varchar2 (50); -- total number of records
V_ SQL varchar2 (32000); -- dynamic SQL
Maxrownum number;
Minrownum number;
Begin
If (pageindex = 0) then
Minrownum: = 0;
Else
Minrownum: = (PageIndex-1) * pagesize;
End if;

Maxrownum: = minrownum + pagesize;
V_sourcetb1: = '(select' | fieldstr | 'from' | tbname | ') sourcetb1 ';
V_sourcetb2: = '(select * from' | v_sourcetb1 | 'where' | rowfilter | ''| sortstr | ') sourcetb2 ';
V_sourcetb3: = '(select rownum as rowindex, sourcetb2. * from' | v_sourcetb2 |') sourcetb3 ';
V_sourcetb4: = '(select * from' | v_sourcetb1 | 'where' | rowfilter | ') sourcetb4 ';
V_ SQL: = 'select count (*) as totalcount from '| v_sourcetb4;
Execute immediate v_ SQL into v_totalcount;
Totalcount: = v_totalcount;
V_ SQL: = 'select * from' | v_sourcetb3 | 'where rowindex> '| minrownum |' and rowindex <= '| maxrownum;
Open cur_returncur for v_ SQL;
End per_quickpage;
End p_page;

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Create or replace package p_page is
Type t_cursor is ref cursor;
Procedure per_quickpage
(
Tbname in varchar2, -- table name
Fieldstr in varchar2, -- field set
Rowfilter in varchar2, -- filter Condition
Sortstr in varchar2, -- sorting set
Pagesize in number, -- page size
Pageindex in number, -- page number
Totalcount out number, -- total number of records
Cur_returncur out t_cursor
);
End p_page;