APEX do not allow to change the lines of the columns that are the primary key?
I have pictures:http://img508.imageshack.us/my.php?image=21269582oe8.jpg
Book (id_book - 'Primary key', title, year); book_author (id_author id_book - 'Primary key', - 'Primary key'); author (id_author - "Primary key", name)
I created a new page-> Form-> form of 'author' table because I want to add new authors, modification and deletion. During the creation of this page, I have chosen column 'id_author' as '1 primary key column' and everything is OK (I can't edit the 'id_author' column - this column is autoincrement and I can change the 'name' column).
BUT I also created a new page-> Form-> table for table "book_author" because I like to write numbers like id_book and id_author, change and remove them (so add relations between tables: book, book_author and author). During the creation of this page, I have chosen column 'id_book' as '1 primary key column' and 'id_author' as 'column primary key 2'. And on the Web site, I can't edit these fields. And I can not add also new line because I see in each new line: (null).
http://img444.imageshack.us/my.php?image=11324615yk9.jpg
APEX do not allow to change the lines of the columns that are the primary key? It's stupid... What can I do?
Edited by: user10731158 2008-12-20 11:40
Column unique and not meaningful if you ever want to update. In the case of your example, you need to add an ID column in the intersection of book_author table. Honestly, I was so blown away (and pleasantly surprised) by the absence of rebuttal and the "thx" I advanced and set up an example of how I would define the book_author table:
create table book_author
(id varchar2(32),
book_id varchar2(32),
author_id varchar2(32),
modified_on date,
modified_by varchar2(255),
constraint book_author_pk primary key (id),
constraint book_auth_book_fk foreign key (book_id) references books(id),
constraint book_auth_author_fk foreign key (author_id) references authors(id)
)
/
create unique index book_author_uq on book_author (book_id,author_id)
/
create or replace trigger biu_book_author before insert or update on book_author
for each row
begin
if inserting then
:new.id := sys_guid();
end if;
modified_on := sysdate;
modified_by := nvl(v('APP_USER'),user);
end;
/
Good luck
Tyler
Tags: Database
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From a post by Rehman F.
Here are the steps to change the ownership and permissions of files and folders:
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