Nested table of object type have only one record all the time

Hi all

I have a question regarding the storage of multiple records in a nested Table that is of type OBJECT.

The program below that I wrote for the test and during the test, I was able to store only the last record in the nested Table.

Please let me know what I did wrong here.

Step 1:
CREATE or REPLACE TYPE book_obj AS OBJECT (name varchar2 (25), author varchar2 (25), abstract varchar2 (4000));
/

Step 2:
CREATE or REPLACE TYPE book_table IS TABLE OF THE book_obj;
/

Step 3: CREATE TABLE book (name, varchar2 (25), varchar2 (25) author, varchar2 (4000)) abstract;
INSERT VALUES Accountants ('Harry Potter,' 'MK', 'It's magic');
INSERT the book VALUES ("Ramayana', 'VK', 'It is mythiology'");
COMMIT;

Step 4:
declare
bookset book_table;
ln_cnt pls_integer;
Start
bookset: = book_table (book_obj ('madhu', 'kongara', 'sudhan'));
dbms_output.put_line (' the number is ' | bookset.) (Count); -> I see COUNT = 1
bookset: = bookset_t(); -> Assignment to NULL.
dbms_output.put_line (' the number is ' | bookset.) (Count); -> I see County 0
for rec in (select * from book) loop-> now a loop twice.
dbms_output.put_line (' name > ' |) Rec.Name);
bookset: = bookset_t (book_t (rec.name, rec.author, rec.abstract));
end loop;
dbms_output.put_line (' the number is ' | bookset.) (Count); -> I can see COUNT = 1 (why?)
END;

I looped twice to fill two records in the TABLE IMBRIQUEE OF TYPE OBJECT. But when I see the Count I get only 1 and the data is also having the last record.

Can you get it someone please let me know how to fill out the table nested with all records. Tell me where I am wrong.

Very much appreciate your help here.

Thank you and best regards,
NKM

Maldini says:
dbms_output.put_line (' the number is ' | bookset.) (Count); -->, I can see COUNT = 1 (why?)

Because instead of add to bookset collectionto set (ergo replacement) it a collection containing recovered book. Use:

declare
    bookset book_table;
    ln_cnt pls_integer;
begin
    bookset := book_table(book_obj('madhu','kongara','sudhan'));
    dbms_output.put_line('The count is '||bookset.count); --> I can see COUNT =1
    bookset := book_table(); --> Assigning back to NULL.
    dbms_output.put_line('The count is '||bookset.count); --> I can see count as 0
    for rec in (select * from book) loop --> Now Looping two times.
      dbms_output.put_line(' name > '||rec.name);
      bookset.extend;
      bookset(bookset.count) := book_obj(rec.name, rec.author, rec.abstract);
    end loop;
    dbms_output.put_line('The count is '||bookset.count); --> I can see COUNT =1 (why)
end;
/
The count is 1
The count is 0
name > Harry Potter
name > Ramayana
The count is 2

PL/SQL procedure successfully completed.

SQL>

Or better use bulk collect:

declare
    bookset book_table;
    ln_cnt pls_integer;
begin
    bookset := book_table(book_obj('madhu','kongara','sudhan'));
    dbms_output.put_line('The count is '||bookset.count); --> I can see COUNT =1
    bookset := book_table(); --> Assigning back to NULL.
    dbms_output.put_line('The count is '||bookset.count); --> I can see count as 0
    select  book_obj(name,author,abstract)
      bulk collect
      into  bookset
      from  book;
    for i in 1..bookset.count loop --> Now Looping two times.
      dbms_output.put_line(' name > '||bookset(i).name);
    end loop;
    dbms_output.put_line('The count is '||bookset.count); --> I can see COUNT =1 (why)
end;
/
The count is 1
The count is 0
name > Harry Potter
name > Ramayana
The count is 2

PL/SQL procedure successfully completed.

SQL>

SY.

Tags: Database

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