DIFFERENCE BETWEEN THE STRONG AND THE SLIDERS OF THE WEEK IN ORACLE

Hi all

Can someone tell me please... What the Ref cursor.in, in which case we use the ref cursor .and what is difference between strong and week ref cursor.

Thanks in advance,
Sanjeev.

Hello

 What is Ref Cursor :
---------------------------------------------------------------------------------------

-->It is aslo a user defined type
-->ref cursor allows you to declare the  cursor variable those are independent of select statement
 i .e
   the cursor variable declared using ref cursor type is ready to accept any select statement dynamically at the time of opening

-->Ref cursor are of two types

  1) A Strong ref cursor(also called static structure type)
2)Weak ref cursor(also  called dynamic structure type )

1)Strong ref cursor:
-->When return type included then it is called strong or static structure type
-->static ref cursor support different  type of select statement but all of same strucure ,but not neccessary that the table should be same
2)Weak Ref  Cursor:

  this ref cursor allows us to any  type of select statement irrespective of data structure . i .e any table

Ref Cursor:

Syntax:
  type  is ref cursor [return ];
syntax for open statement:
  open  for select statement .......;

Example of strong cursor

 --------Strong cursor ----------------------

 declare

 type emprefcur is ref cursor return emp%rowtype;
 ec emprefcur;
 v_ec ec%rowtype;
begin
  open ec for select * from emp;
 loop
      fetch ec into v_ec;
      exit when ec%notfound;
     print(v_Ec.empno);
     print(v_ec.ename);
 end loop;
close ec;

 print('-------------------------------------------------------------------------'):
  open ec for select * from emp;
 loop
      fetch ec into v_ec;
      exit when ec%notfound;
     print(v_Ec.empno);
     print(v_ec.ename);
 end loop;
close ec;

 end;

Example of low slider
-------------

declare
------------------weak cursor --------------------------
type refcur is ref cursor;
 xc refcur;
v_Ec emp%rowtype;
v_dc dept%rowtype;
begin
  open xc for select * from emp;
loop
     fetch xc into v_ec;
 exit when xc%notfound;
  print(v_ec.ename);
  print(v_Ec.empno);
end loop;

close xc;

print('--------------------------------------');
open xc for select * from dept;
loop
     fetch xc into v_dc;
     exit  when xc%notfound;
  print(v_dc.deptno);
  print(v_dc.dname);
  print(v_dc.loc);

end loop;
close xc;

end;

Thank you
Prakash P

Published by: prakash on December 19, 2011 21:14

Tags: Database

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