Getting desired column from database

HI....
i have a table in my database with 5 columns.......
can someone tell me how can i retrieve desired column n show only that...
suppose i want only column 3 to be shown..
Edited by: RedDevils on Apr 9, 2008 12:01 AM

Take a look at the links:
http://www.w3schools.com/sql/default.asp
http://java.sun.com/docs/books/tutorial/jdbc/

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Hi,
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Hi,
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AND o.type = 'U'
INNER JOIN sys.systypes st
ON c.user_type_id = st.xusertype
INNER JOIN sys.schemas s
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INNER JOIN sys.indexes i
ON o.object_id = i.object_id
AND i.index_id = (SELECT MIN(index_id) FROM sys.indexes WHERE object_ID = o.object_id)
INNER JOIN sys.filegroups f
ON i.data_space_id = f.data_space_id
), rCTE AS (
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FROM allCols
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), allIndx AS (
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CASE WHEN is_included_column = 1 THEN '['+c.name+']'END As incCols,
') WITH ('+
CASE WHEN is_padded = 0 THEN 'PAD_INDEX = OFF,' ELSE 'PAD_INDEX = ON,' END+
CASE WHEN ignore_dup_key = 0 THEN 'IGNORE_DUP_KEY = OFF,' ELSE 'IGNORE_DUP_KEY = ON,' END+
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AND o.type = 'U'
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FROM allIndx o
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WHERE column_id = (SELECT MAX(column_id) FROM rCTE WHERE r.oName = oName)
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i have one doudt regarding in my web application Development
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[email protected]

hai
I think ur doubt will be...
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[email protected]
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Hi,
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TRUC               10                         1
TITI               20                         3
TUTU               20                         3
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TOTO               10                               1
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HTH,
Nicolas.
Message was edited by:
N. Gasparotto
In my queries, I replace yougest by oldest like requirements, sorry.

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It wonderful !
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NLS_LANGUAGE AMERICAN
NLS_TERRITORY AMERICA
NLS_CURRENCY $
NLS_ISO_CURRENCY AMERICA
NLS_NUMERIC_CHARACTERS .,
NLS_CALENDAR GREGORIAN
NLS_DATE_FORMAT DD-MON-RR
NLS_DATE_LANGUAGE AMERICAN
NLS_CHARACTERSET WE8ISO8859P15
NLS_SORT BINARY
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NLS_TIMESTAMP_FORMAT DD-MON-RR HH.MI.SSXFF AM
NLS_TIME_TZ_FORMAT HH.MI.SSXFF AM TZH:TZM
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Help please !
[email protected]

Charset in the machine you develop must be the same with the Charset in DB (WE8ISO8859P15). Or try request.setCharacterEncoding("ISO_8859_15"); on top of servlet.

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2.) To create a stored procedure containing the queries and call the stored procedure from my java program. Also, not that some of the queries needs to be created dynamically depending upon the parameteters supplied.
Out of these two approches which is optimum and why?
Also, following things to be noted.
1. At times I want to create where clause of the query dynamically depenending upon the parameters passed.
2. I want one single java file that will handle all database calls.
3. Paramters to the stored procedure can be passed using array descriptor.
4. Conneciton I am making using JNDI.
Please do provide me optimum way of out these two. You may also suggest some other approaches, if any.
Thanks,
Rajan
Edited by: RP on Jun 26, 2012 11:11 PM

RP wrote:
In case of queries stored in text files. I will require to replace some pre defined placeholder with actual parameters and then pass that modified query to db engine. Even I liked the second approach as it is more easily maintainable. There are a couple of issues. Shared SQL is one. Irrespective of the method used, the SQL cursor that is created needs to have bind variables. This ensures re-usability of the cursor. This reduces the risk of Shared Pool fragmentation. This lowers hard parsing and reduces CPU utilisation.
Another issue is flexibility. If the SQL cursors are created by stored procedures, this code resides on the server and abstracts the Java client from the complexities of SQL and SQL performance. The code can easily be updated and fine tuned to deliver faster/better SQL cursors, or modified to take new Oracle features, changes in data model, and so on, into consideration. This stored proc can be updated without having to touch or recompile a single byte of Java client code.
There's also the security issue. What is more secure? SQL encapsulated in stored procs in a secure database and server environment? Or SQL "encapsulated" in text files on the client?
The less code you have running on the client, the less code you have running in the wild that can be compromised without having to first compromise the server.
Only I was worried about any performace issue might happen using this approach. Performance is not a factor of who creates the SQL cursor.
Whether Java client creates a SQL cursor, or a PL/SQL stored proc creates a SQL cursor, or a .Net client creates a SQL cursor - that SQL cursor does not know what the client is. It does not care what the client is. The SQL cursor performs as well as it is capable of.. given the execution plan, data volumes, server resources and speed/performance of the server.
The client language and SQL cursor interface used by the client (there are several in PL/SQL), determines the performance of the client's interaction with the cursor (e.g. round trips to the database when interfacing with the cursor). The client language (and its client interface to the cursor) does not dictate the actual performance of that SQL cursor on the database (does not make joins faster, or I/O faster)
One more question, Will my java program close the cursor that I opened in Procedure?That you need to ask your Java code. Java code leaking ref cursors are unfortunately all too common. You need to make sure that your Java client interface to SQL cursors, closes the cursor handle when done.

Using get properties VI from database toolkit

Hello I'm using database toolkit to read and import data from a MySql database.
I want to read the last row that has been written in a table. I don't know how to do this but i think i can know the number of the last row written using the get properties block.
But using this VI i have to use execute query block.....and i get an error, i think that the sql query is not defined correctly.
I have posted a part of my VI where i use this blocks.
I have two questions: is this the way to read the last row that has been written in a table of a database??
The other question is why doesn't run this subVi and what is the correct way to define a SQL query (you have to put the table name, o some other thing)
Thank you very much
Larson
Attachments:
example.PNG ‏12 KB

I hate when this happens... if I press TAB + SPACE the message is sent to forum... :-s
Hi, Larson:
You can't read "the last row written" in a DataBase, as records are not sorted, by definition. You could have a field in a record that grows every time you insert in a table, like AutoNumeric, or DateTime and then you could know exactly wich record is the last one.
Once you know how to get "the last row written" you have to translate it to SQL. Provided you have an AutoNumeric field named "IdRow" in your table "TestTable", you could write:
SELECT * FROM TestTable WHERE IdRow = (MAX(t.IdRow) from TestTable t)
Now you should build a call to the DataBase.
First you need ExecuteQuery, as you did use, and SQL Query input should be the like "SELECT * FROM..."
Second you have to retrieve the data with, for example, "DB Tools Fetch Recordset Data", in DB Palette, next to Execute Query. The output will be a Variant 2D Array that you can convert to anything you want, like String 2D Array, for example using Variant palette functions
And third you have to close the recordset Reference with "DB Tools Free Object", the rightmost function in the same row as Execute Query.
And once you have done all, you can close de DataBase.
Hope it helps,
Aitortxo.

Getting desired column from database

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