Save 
Join IIUG
 for   
 

Informix News
18 Nov 13 - ZDNet - Top 20 mobile skills in demand... Read
09 Sep 13 - telecompaper - Shaspa and Tatung have shown a new smart home platform at Ifa in Berlin. Powered by the IBM Informix software... Read
06 Sep 13 - IBM data magazine - Mission Accomplished - Miami, Florida will be the backdrop for the 2014 IIUG Informix Conference... Read
01 Feb 13 - IBM Data Magazine - Are your database backups safe? Lester Knutsen (IBM Champion) writes about database back up safety using "archecker"... Read
14 Nov 12 - IBM - IBM's Big Data For Smart Grid Goes Live In Texas... Read
3 Oct 12 - The Financial - IBM and TransWorks Collaborate to Help Louisiana-Pacific Corporation Achieve Supply Chain Efficiency... Read
28 Aug 12 - techCLOUD9 - Splunk kicks up a SaaS Storm... Read
10 Aug 12 - businessCLOUD9 - Is this the other half of Cloud monitoring?... Read
3 Aug 12 - IBM data management - Supercharging the data warehouse while keeping costs down IBM Informix Warehouse Accelerator (IWA) delivers superior performance for in-memory analytics processing... Read
2 Aug 12 - channelbiz - Oninit Group launches Pay Per Pulse cloud-based service... Read
28 May 12 - Bloor - David Norfolk on the recent Informix benchmark "pretty impressive results"... Read
23 May 12 - DBTA - Informix Genero: A Way to Modernize Informix 4GL Applications... Read
9 Apr 12 - Mastering Data Management - Upping the Informix Ante: Advanced Data Tools... Read
22 Mar 12 - developerWorks - Optimizing Informix database access... Read
14 Mar 12 - BernieSpang.com - International Informix User Group set to meet in San Diego... Read
1 Mar 12 - IBM Data Management - IIUG Heads West for 2012 - Get ready for sun and sand in San Diego... Read
1 Mar 12 - IBM Data Management - Running Informix on Solid-State Drives.Speed Up Database Access... Read
26 Feb 12 - BernieSpan.com - Better results, lower cost for a broad set of new IBM clients and partners... Read
24 Feb 12 - developerWorks - Informix Warehouse Accelerator: Continuous Acceleration during Data Refresh... Read
6 Feb 12 - PRLOG - Informix port delivers unlimited database scalability for popular SaaS application ... Read
2 Feb 12 - developerWorks - Loading data with the IBM Informix TimeSeries Plug-in for Data Studio... Read
1 Feb 12 - developerWorks - 100 Tech Tips, #47: Log-in to Fix Central... Read
13 Jan 12 - MC Press online - Informix Dynamic Server Entices New Users with Free Production Edition ... Read
11 Jan 12 - Computerworld - Ecologic Analytics and Landis+Gyr -- Suitors Decide to Tie the Knot... Read
9 Jan 12 - planetIDS.com - DNS impact on Informix / Impacto do DNS no Informix... Read
8 Sep 11 - TMCnet.com - IBM Offers Database Solution to Enable Smart Meter Data Capture... Read
1 Aug 11 - IBM Data Management Magazine - IIUG user view: Happy 10th anniversary to IBM and Informix... Read
8 Jul 11 - Database Trends and Applications - Managing Time Series Data with Informix... Read
31 May 11 - Smart Grid - The meter data management pitfall utilities are overlooking... Read
27 May 11 - IBM Data Management Magazine - IIUG user view: Big data, big time ( Series data, warehouse acceleration, and 4GLs )... Read
16 May 11 - Business Wire - HiT Software Announces DBMoto for Enterprise Integration, Adds Informix. Log-based Change Data Capture... Read
21 Mar 11 - Yahoo! Finance - IBM and Cable&Wireless Worldwide Announce UK Smart Energy Cloud... Read
14 Mar 11 - MarketWatch - Fuzzy Logix and IBM Unveil In-Database Analytics for IBM Informix... Read
11 Mar 11 - InvestorPlace - It's Time to Give IBM Props: How many tech stocks are up 53% since the dot-com boom?... Read
9 Mar 11 - DBTA - Database Administration and the Goal of Diminishing Downtime... Read
2 Feb 11 - DBTAs - Informix 11.7 Flexible Grid Provides a Different Way of Looking at Database Servers... Read
27 Jan 11 - exactsolutions - Exact to Add Informix Support to Database Replay, SQL Monitoring Solutions... Read
25 Jan 11 - PR Newswire - Bank of China in the UK Works With IBM to Become a Smarter, Greener Bank... Read
12 Oct 10 - Database Trends and Applications - Informix 11.7: The Beginning of the Next Decade of IBM Informix... Read
20 Sep 10 - planetIDS.com - ITG analyst paper: Cost/Benefit case for IBM Informix as compared to Microsoft SQL Server... Read
20 Jul 10 - IBM Announcements - IBM Informix Choice Edition V11.50 helps deploy low-cost scalable and reliable solutions for Apple Macintosh and Microsoft Windows... Read
20 Jul 10 - IBM Announcements - Software withdrawal: Elite Support for Informix Ultimate-C Edition... Read
24 May 10 - eWeek Europe - IBM Supplies Database Tech For EU Smart Grid... Read
23 May 10 - SiliconIndia - IBM's smart metering system allows wise use of energy... Read
21 May 10 - CNET - IBM to help people monitor energy use... Read
20 May 10 - ebiz - IBM Teams With Hildebrand To Bring Smart Metering To Homes Across Britain... Read
19 May 10 - The New Blog Times - Misurare il consumo energetico: DEHEMS è pronto... Read
19 May 10 - ZDNet - IBM software in your home? Pact enables five-city smart meter pilot in Europe... Read
17 March 10 - ZDNet (blog) David Morgenstern - TCO: New research finds Macs in the enterprise easier, cheaper to manage than... Read
17 March 2010 - Virtualization Review - ...key components of Big Blue's platform to the commercial cloud such as its WebSphere suite of application ser vers and its DB2 and Informix databases... Read
10 February 2010 - The Wall Street Journal - International Business Machines is expanding an initiative to win over students and professors on its products. How do they lure the college crowd?... Read


End of Support Dates

IIUG on Facebook IIUG on Twitter

[ View Thread ] [ Post Response ] [ Return to Index ] [ Read Prev Msg ] [ Read Next Msg ]

IDS Forum

Re: creating users with upper lower case mixture

Posted By: Jonathan Leffler
Date: Sunday, 12 December 2010, at 6:14 p.m.

In Response To: creating users with upper lower case mixture (KARL OLIVER)

On Wed, Dec 8, 2010 at 12:55, KARL OLIVER <karl.oliver@maf.govt.nz> wrote:

> Struck a problem I have never met before.
> I created a connection for a user JBoss - yes they insisted mixture of
> upper/lower case.
> This was accepted ok however when looking at sysusers table it had been
> converted to all lower case. So to get informix to accept the upper case I
> had
> to enter the name in quotes as "JBoss" this then worked,
> Why is this ?what governs the conversion to lower case. Could we experience
> problems in the future with access by this user ?
> I have done the normal google search but cant find anything
>

Let me illustrate (because I don't agree with the other answers you've been
given):

This happens to be a logged database; the DELIMIDENT environment variable is
not set.

SQL[1178]: create table "xP[2]".table(s SERIAL PRIMARY KEY, v VARCHAR(255)
NOT NULL);
SQL[1179]: create table 'xP[2]'.decimal(i integer, d date);
SQL[1180]: insert into table values(10101, "what is this for");
SQL[1181]: insert into decimal values(1, '2001-01-01');
SQL[1182]: create table JL.UPPER_CASE(S SERIAL, V VARCHAR(255) NOT NULL);
SQL[1183]: info tables where tabid > 105;
xP[2]|decimal|T|107
xP[2]|table|T|106
jl|upper_case|T|108
SQL[1184]:

What this shows is that you can enclose an owner name in quotes - single or
double quotes - and that name is then used case-sensitively. When you quote
a name, it must be of the correct case. In the first two statements, the
table owner is the same 'xP[2]' character...only a DBA can create table on
behalf of other people, of course, so I'm running as a DBA in this
database. The third statement shows that in a 'normal' (meaning not MODE
ANSI) database, if you enter the name without quotes, it is case-insensitive
and the name is converted to lower-case before being stored in the system
catalog.

If I switch to a MODE ANSI database and re-execute the last create table
statement, I get:

SQL[1186]: connect to 'mode_ansi' wct;
SQL[1187]: create table JL.UPPER_CASE(S SERIAL, V VARCHAR(255) NOT NULL);
SQL[1188]: r 1184;
JL|upper_case|T|106

(I'm using SQLCMD, of course, and "wct" is an abbreviation for WITH
CONCURRENT TRANSACTIONS; I'm too lazy to type it all).

Here, you can see that the unquoted user name JL is stored in upper-case. I
could have typed jl instead of JL and it would still have been
case-converted. If the name is in quotes, it would be stored unchanged,
though.

Note that the table name is still stored in lower case - in MODE ANSI and
non-ANSI databases. Also, by virtue of special treatment, the user name
informix, unquoted, is left in lower case and not converted to upper case.
Note that column names are also case-converted to lower case.

Now, what about DELIMIDENT?

Well, with DELIMIDENT set, strings must be enclosed in single quotes;
anything inside double quotes is taken to be a 'delimited identifier', not a
string. (This is what the SQL standard requires.) And, with DELIMIDENT
set, you can have case-sensitive column names and table names.
Interestingly, though, the owner names can still be single quoted or double
quoted. Delimited identifiers are not case-converted.

This is in the logged database again:

+ create table "xP[2]".table(s SERIAL PRIMARY KEY, v VARCHAR(255) NOT NULL);
+ create table 'xP[2]'.decimal(i integer, d date);
+ insert into table values(10101, 'what is this for');
+ insert into decimal values(1, '2001-01-01');
+ create table "JL"."UPPER_CASE"(S SERIAL, V VARCHAR(255) NOT NULL);
+ info tables where tabid > 105;
+ SELECT Owner, TabName, TabType, TabID FROM "informix".SysTables T WHERE
TabID >= 100 AND TabType IN ('T', 'V', 'P', 'S') AND ( tabid > 105)
ORDER BY TabName, Owner
JL|UPPER_CASE|T|118
xP[2]|decimal|T|117
xP[2]|table|T|116

Note that I had to change the quotes around "what is this for" to single
quotes.

The upshot is that as long as you are consistent, you won't run into
trouble. If you are not consistent, mixed case names, or names with spaces
etc in them, can wreak havoc on the unprepared (such as DB-Export etc).

As an extreme example of a delimited identifier, you can create a table
owned by the user with the name consisting of 32 double quotes - specified
by an opening double quote, 32 pairs of double quotes, plus a closing double
quote. You can also create a table with the name consisting of 128 double
quotes - specified by an open double quote, 128 pairs of double quotes, and
a closing double quote. That requires a total of 324 bytes for the name,
plus 2 more (one for the dot and the other for the terminating null. Few
people allocate enough space to handle that name; the DB-Export and
DB-Import tools also dislike the names (but IDS itself works very happily
with the names).

--
Jonathan Leffler <jonathan.leffler@gmail.com> #include <disclaimer.h>
Guardian of DBD::Informix - v2008.0513 - http://dbi.perl.org
"Blessed are we who can laugh at ourselves, for we shall never cease to be
amused."

--00504502e485f9ec7b04973ec051

Messages In This Thread

[ View Thread ] [ Post Response ] [ Return to Index ] [ Read Prev Msg ] [ Read Next Msg ]

IDS Forum is maintained by Administrator with WebBBS 5.12.