Skip to main content

Drop It Like It's Not

I just ran the following script:

-- TABLES
FOR x IN (SELECT table_name FROM user_tables)
LOOP
  EXECUTE IMMEDIATE('DROP TABLE ' || x.table_name || ' CASCADE CONSTRAINTS');
END LOOP;

 -- SEQUENCES
FOR x IN (SELECT sequence_name FROM user_sequences)
LOOP
  EXECUTE IMMEDIATE ('DROP SEQUENCE ' || x.sequence_name);
END LOOP;

 -- VIEWS
FOR x IN (SELECT view_name FROM user_views)
LOOP
  EXECUTE IMMEDIATE ('DROP VIEW ' || x.view_name);
END LOOP;

Basically, drop all tables, views and sequences.  It worked great, cleaning out those objects in my schema without touching any packages, producers or functions.  The was just one problem:  I ran it in the wrong schema.

Maybe I didn't have enough coffee, or maybe I just wasn't paying attention, but I essentially wiped out a schema that I really would rather not have.  But I didn't even flinch, and here's why.

All tables & views were safely stored in my data model.  All sequences and triggers (and packages, procedures and functions) were safely stored in scripts.  And both the data model and associated scripts were safely checked in to version control.  So re-instantating this project was a mere inconvenience that took no more than the time it takes to drink a cup of coffee - something I clearly should have done more of earlier this morning.

Point here is simple: take the extra time to create a data model and a version control repository for your projects - and then make sure to use them!  I religiously check in code and then make sure that at least my TRUNK is backed up elsewhere.  Worst case for me, I'd lose a couple of hours or work, perhaps even less, which is far better than the alternative.

Comments

Noons said…
To this day I don't get it why there isn't an inbuilt utl_something to do a quick metadata only datapump of either a schema or the entire db into a standard directory - extremely useful for all kinds of reasons, one of which is this post.
Ah well, it must be now (all of a sudden) in the minds of the "experts"...
September 17, 2015 at 9:07 PM
Jeffrey Kemp said…
It amazes me how often I come across places who still don't have any repository for their schema definitions (let alone version control). Setting up a code repository with some form of automated version control is a mandatory step #1 in any project. "If it's not checked in, it doesn't exist."
September 17, 2015 at 10:36 PM
Scott said…
Agreed. I tell people, "I have all of the source code for X projects, right here on my laptop. If you spill that coffee on my laptop, no worries, as I can get it all back by the time you go out and get me a new coffee." Most are just completely baffled by that.
September 17, 2015 at 10:38 PM
Post a Comment

Popular posts from this blog

Custom Export to CSV

It's been a while since I've updated my blog. I've been quite busy lately, and just have not had the time that I used to. We're expecting our 1st child in just a few short weeks now, so most of my free time has been spent learning Lamaze breathing, making the weekly run to Babies R Us, and relocating my office from the larger room upstairs to the smaller one downstairs - which I do happen to like MUCH more than I had anticipated. I have everything I need within a short walk - a bathroom, beer fridge, and 52" HD TV. I only need to go upstairs to eat and sleep now, but alas, this will all change soon... Recently, I was asked if you could change the way Export to CSV in ApEx works. The short answer is, of course, no. But it's not too difficult to "roll your own" CSV export procedure. Why would you want to do this? Well, the customer's requirement was to manipulate some data when the Export link was clicked, and then export it to CSV in a forma...
76 comments
Read more

Manipulating Images with the... Database?

A recent thread on the OTN HTML DB Forum asked about how to determine the width & height of an image stored as a BLOB in an Oracle table. I mentioned in that thread that I have some code to manipulate an image stored in a BLOB column. This is particularly useful if you’re going to let users upload images, and you want to re-size them to display as a thumbnail. Thanks to Oracle interMedia , it is trivial to manipulate the width, height, and other attributes of images stored in an Oracle table. I’ve created a sample application here which demonstrates Oracle interMedia and HTML DB in action. Feel free to have a look. You can download this application from HTML DB Studio as well. Basically, this application allows you to upload images and perform an operation on the image as it is inserted into the PHOTO_CATALOG table. There are two places where some PL/SQL code is required: an After Submit process on page 2, and a procedure to display the images. Here is the PL/SQL for the After...
33 comments
Read more

Page 0 Branches

What? There's no way to put a Branch on Page 0 of an ApEx application! Or is there... Technically, no - page 0 does not support branches. But how many times do you wish it did? This scenario recently came up: I wanted to put a "Search" box on every page in my application, so no matter where a user is, they can search the site. Currently, it has 10 or so pages, but this will grow to closer to 50 by production. So, thought #1 was to put an text item on Page 0, call it search, and then ensure that each and every page had some sort of Branch to run the search. Not so fun, as this was a tedious task, even for just 10 pages. And each time a new page was added to the application - by myself or anyone else - the search branch would have to be added to the page. Clearly not a scalable solution. With a little bit of help from Raj from the ApEx team, I came up with this solution: Create Page 0, if you haven't already On page 0, create an item of type "Text Field (...
13 comments
Read more