Approach of using Bulk Collect

Question

Hi Experts,
how to use bulk collect for uncertain number of columns of select statement.
Master table structure:
Create table tabmst
(id number,
cls_input varchar2(2000),
price number);
insert into tabmst(1,'select product, price from product',500);
insert into tabmst(2,'select product, price,purchase_dt from product',100);
insert into tabmst(3,'select * from product',1000);
Currently I want to store Select statement of cls_input column in a local variable like
dyn_qry:= cls_input; by using a cursor.
Now my question is how to use Bulk Collect by using "Execute Immediate" in Bulk collect variable as there is not certainity of the number of columns from "Select Statment". Please suggest.
Sample code:
I created TYPE variable for Bulk Collect also support blk_var;
Declare
dyn_qry varchar2(3000);
cursor c1 is select * from tabmst;
begin
for i in c1 loop
dyn_qry:= cls_input;
Execute immediate dyn_qry into blk_var;
End Loop;
End;
Now I want to store values of Each "Select statements columns" which is executing by dynamic SQL. but it is uncertain that how many columns with return from dynamic SQL.
Please suggest the approach on the same. Thanks in advance.

Answer 1

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I don't think you can use bulk collect with EXECUTE IMMEDIATE. They do two different things. EXECUTE IMMEDIATE allows the execlution of dynamic SQL. BULK COLLECT provides optimization of SELECT statements when loading the contents into collections. I am not aware of any support for BULK COLLECT with EXECUTE IMMEDIATE.
You may be able to do this a different way. If you must use dynamic SQL (I suggest you don't unless it is absolutely necessary. Dynamic SQL is hard to write, hard to debug, hard to maintain, and hard to tune) use a reference cursor instead. You can use the BULK COLLECT with the standard fetch.