RETURNING RECORD INTO

This is an idea for an enhancement to the PL/SQL syntax.

If I have the following declaration:

DECLARE
  in_record mytable%ROWTYPE;
  out_record mytable%ROWTYPE;
BEGIN

I can do this:

  INSERT INTO mytable VALUES in_record;

I can also do this:

  UPDATE mytable SET ROW = in_record WHERE ...;

I can do this, as long as I list each and every column, in the right order:

  INSERT INTO mytable VALUES in_record
  RETURNING cola, colb, colc INTO out_record;

But I (more...)

Current_Schema and the Data Dictionary

Being a huge fan of Logger, the PL/SQL logging utility, I really wanted this be to included in the project that I'm currently working on. So I downloaded it (link at the bottom of this blog) and included it in our deployment scripts. Done.... at least I thought so, but of course this wasn't the case.

The regular install script for Logger looks something like the following (parts removed and table names are changed):


set (more...)

PL/SQL vs SQL

plsql_logoThere is a ‘rule’, I think it was created by Tom Kyte, stating: If you can do it in SQL, do it in SQL. I came across some code the other day that makes perfect sense to do then you are running an Oracle 10g (or earlier) instance. I rewrote the code to use only the EMP and DEPT tables to protect the suspects and maybe innocent.

The function defined is something like this:

Deterministic functions, result_cache and operators

In previous posts about caching mechanism of determinstic functions I wrote that cached results are kept only between fetch calls, but there is one exception from this rule: if all function parameters are literals, cached result will not be flushed every fetch call.
Little example with difference:

SQL> create or replace function f_deterministic(p varchar2)
  2     return varchar2
  3     deterministic
  4  as
  5  begin
  6     dbms_output.put_line(p);
  7     return p;
  8  end;
  9  /
SQL> set  (more...)

wpg_docload.download_file : mime type not recognized by client

For a project we are currently working on, we needed to generate, and send a Word 2010 document to the client. The document was generated by a great PL/SQL document generation tool called Doxxy, and was send to the client using the wpg_docload package. This is a standard Oracle pl/sql package that can be used to download files, BLOBs and BFILEs.

Before the download, we set the Content-type in the http header as follows :

owa_util. (more...)

When v$sesstat statistics are updated

Craig Shallahamer wrote excellent article “When is v$sesstat really updated?”.
And my today post just a little addition and correction about the difference of updating ‘Db time’ and ‘CPU used by this session’ statistics.

Test #1

In this test I want to show that the statistics will be updated after every fetch call.
I have set arraysize=2, so sql*plus will fetch by 2 rows:
(full script)

-- Result will be fetched by  (more...)

Oracle PL/SQL Programming, 6th Edition

PL/SQL is procedural language, that's very useful when you work with Oracle Database.  As DBA, you might have to write PL/SQL to do some tasks. Developer on Oracle Database must know about PL/SQL.
This post I mention a book title - Oracle PL/SQL Programming by Steven Feuerstein (@stevefeuerstein), Bill Pribyl. This book is a new edition that covers PL/SQL on Oracle Database 12c. Readers can use examples in a book for practice and get (more...)

Oracle PL/SQL Programming 6th edition by Steven Feuerstein

opp6_catI have reviewed the latest edition of Oracle PL/SQL Programming. This is not a book, at least for me, that I would read front to back. I use it mostly as a reference, but the great thing about this book is that you can also use this book to learn programming PL/SQL from scratch.

The book is nicely ordered into different parts, like Program structure and how to use SQL in PL/SQL (which by the (more...)

PL/SQL, UTL_HTTP and Digest Authentication

For the first time in what seems like ages, I've actually put together a piece of code worth sharing. It's not that I haven't been working, but just that it has all been very 'in-house' specific.

However I had a recent requirement to use a web service that makes use of Digest Authentication. If you have look at the UTL_HTTP SET_AUTHENTICATION subprogram, it only addresses Basic authentication (and, apparently, Amazon S3 which looks intriguing).

In (more...)

Single SQL vs SQL+PL/SQL

Everyone knows Tom Kyte’s mantra:

You should do it in a single SQL statement if at all possible.

But we all know that “Every rule has an exception
There are many different cases when pl/sql with sql can be more efficient than only sql, and i dont want to catalog them. I just want to show a couple examples of such exceptions:

1. Running totals by several dimensions

Simple example from forum:

 (more...)

Typical

After a presentation by Lucas Jellema I decided to try something with types in Oracletable_EMP. One of the issues posed in this presentation was that the type cannot include self-reference. Neither direct nor indirect.

A table like the emp table cannot be expressed as an object type. The table has a column mgr which is a reference to another employee.

So I tried something like this:

type_EMP_T

Watch out with function result cache based on data dictionary views

Result cache is a powerful tool to gain performance in PL/SQL.
There are many examples on the internet that proves this, e.g. these articles on All things Oracle:
- Result Cache(1)
- Result Cache(2)

But I’m not going to talk about performance.
This article is some kind of warning.

First I’ll show you how result cache works on a normal view.
I’ll create a table, a view on this table and a function that (more...)

KScope14

ODTUG_Kscope14

This year, from June 22 - June 26, the best convention in the world, ODTUG’s KScope14 will be held in Seattle, Washington. I am already looking forward to meeting some ‘old’ friends again, creating new friends and seeing some of the best content by presenters from all over the world.

Some of the presentations I am looking forward to:

In the Developer’s Toolkit track:

Readable Code for Modify_Snapshot_Settings

It annoyed me slightly that when I googled modify_snapshot_settings just now and all of the examples used huge numbers for the retention with (at best) a brief comment saying what the number meant. Here is a better example with slightly more readable code. Hope a few people down the road (more...)

Yet another one on ‘Oracle Type inheritance and advanced type casting’

Triggered by a comment on an older article I wrote a little article yesterday on determining the instance of an object. As far as known by me at least and seemingly by Google there is no java instanceOf counterpart in Oracle Pl/Sql. In SQL Where clauses you can use the (more...)

Another one on "Oracle Type inheritance and advanced type casting"

Already four and a half year ago I wrote an article on Oracle Type inheritance and type casting.  See here. But although Object types are supported by Oracle since Oracle 8, it seems to me that there is still little familiarity on the subject.
I'm not really a Pl/Sql (more...)

Invisible Not Null Column

Yesterday I attended John King (@royaltwit) session on Oracle 12c for developers. He gave an overview of all the goodies that are available to us as developers. The whole plugging and unplugging of database, though very cool and exiting, is most likely not very relevant to most developers.
When he (more...)

APEX Tree based on Pipelined Table Function

Representing hierarchical data in an APEX Tree is fairly straight forward, the wizard to create a tree region assists you with that. But when you need to show data from multiple tables, you will need to provide your own query. In a previous blogpost I have written how to achieve (more...)

Oracle Database 12c PRAGMA UDF and WITH clause enhancements

Here are two interesting enhancements in Oracle database 12c PL/SQL. PL/SQL subprogram defined using WITH clause of a subquery – Oracle database 12c allows PL/SQL declaration section in the WITH clause. One can define PL/SQL function or procedure into a WITH clause. Functions declared in the PL/SQL declaration section can (more...)

New York Oracle User Group Fall Conference Materials

Thank you all who attended my sessions at NYOUG Fall Conference this morning. I appreciate spending you most precious commodity - your time - with me. I sincerely hope you found both the presentations enlightening as well as entertaining.

Please see the details of the sessions below along with the (more...)