Himu\’s Attempt at Blogging

Tidbits from my thoughts

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Written by mhimu

June 1, 2009 at 12:37 pm

Posted in Uncategorized

SQL – Dynamic Date Range, Number Range in Oracle, SQL Server, and DB2/400

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Often, we need to make coverage reports that span over a period of time and where all points in the period do not contain data.

Assume a shop has 50 outlets and we want to find the number of sales in each branch over the past ten days. Business is bad in some areas and so some outlets had no sale at all. A query like the following will give only those outlets that had sales but not a list of all outlets:

SELECT outletid, saledate, count(*)
FROM sales
GROUP BY outletid, saledate
ORDER BY outletid, saledate

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Written by mhimu

May 7, 2009 at 11:03 am

ODI – Incremental Update and Surrogate Key using Database Sequence

with 16 comments

I am writing this because it had me lose my sanity for some time. If,

  • You’re using Oracle Data Integrator
  • You’ve defined a dimension table with a surrogate key even if it is not a SCD type 2 (recommended by Kimball)
  • The surrogate key is maintained through a database sequence (Oracle sequence in my case)
  • Your IKM in Incremental Update
  • You’re frustrated about how to control updates to a dimension having a sequenced surrogate key

Then read on for the solution that worked for me. The solution is pretty standard – you only need to know what you’re doing and setting the right options.

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Written by mhimu

May 4, 2009 at 4:35 pm

ODI – How to Reverse Flat Files

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The most important thing to remember before using flat files as datastores in ODI is that the Designer looks for them in the client PC where it runs. I haven’t tried using a UNC (\\computer\share\…) but that should work.

ODI comes pre-configured with a folder for dealing with flat files – in the Topology Manger, you’ll find the FILE_GENERIC data server set up to serve files from the ODI_HOME/oracledi/demo/file directory. But if you want your own file data server then follow these steps:

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Written by mhimu

May 1, 2009 at 3:15 pm

Active Directory Authentication using Java/JNDI

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I’ve successfully performed AD authentication using JNDI from Java. It is almost a copy of the code found in Mauricio Rojas Blog. Thanks Mauricio!

The ADAuthenticator class tries to connect to the AD using the given credentials and retuns a Map containing some information of the user if authentication succeeds. It can be instantiated to authenticate to a default AD or a specific AD in the constructor.

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Written by mhimu

March 18, 2009 at 1:20 pm

Posted in Java

Tagged with ,

iSeries, Oracle Reports 10g and ODBC-JDBC

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I’ve been pulling my hair on this issue:

A complex sql with subqueries and a union written and executed OK in iSeriese Navigator for V5R4. Then I copied and pasted the same SQL in the query definition window of Oracle Reports Builder JDBC query dialog. The connection to iSeries is through the JDBC-ODBC bridge driver. I put :P_xxx parameters in the query.

Guess what? I got an error ‘Variable P_xxx not defined or not usable’.

Earlier, I tested using a simple query with a parameter and it worked fine. After a lot of head-scratching and trial-and-error, finally I got the solution:

Place a blank/space (‘ ‘) around the parameter(s) even if it is at the end of a line (not query)!

The parser seems to stumble upon detecting tokens without spaces.

Written by mhimu

February 3, 2009 at 12:02 pm

Posted in Uncategorized

Storing Membership Data in ASP.NET 2.0 Web Application’s SQL Server Database

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This is a summary of the MSDN article How To: Use Forms Authentication with SQL Server in ASP.NET 2.0.

ASP.NET 2.0 allows storing web-site users and profiles in a database and maintain access control based on that information. The concept is referred to as ‘Forms Authentication’. The database can be SQL Server or Active Directory. Here, you will see how to store them in SQL Server.
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Written by mhimu

July 17, 2008 at 3:03 pm

Posted in dotNet