Relation multiple table using in C# - Database Discussion Boards

Hi

To learn entity frame work

Do I need to learn linq?

thank you

that could be quite handy

In Word you can only store 2 bytes. That is why I use Writer.

Hello All,

If I use a try-catch block in my stored proc, and in the catch block write error to table, do I need to use BEGIN TRANSACTION - COMMIT TRANSACTION to get the try-catch block to work?

I am using -
BEGIN TRY
write my code here
END TRY

BEGIN CATCH
write my code here
END CATCH

But should be - to write errors to a log table.
BEGIN TRY
BEGIN TRANSACTION
write code here
COMMIT TRANSACTION
END TRY
BEGIN CATCH
write code here
END CATCH

no you do not have to(but it is a safer option)..Have a look at the following snippet..-

CSS

USE AdventureWorks2008R2;
GO

-- Variable to store ErrorLogID value of the row
-- inserted in the ErrorLog table by uspLogError
DECLARE @ErrorLogID INT;

BEGIN TRY
    BEGIN TRANSACTION;

    -- A FOREIGN KEY constraint exists on this table. This
    -- statement will generate a constraint violation error.
    DELETE FROM Production.Product
        WHERE ProductID = 980;

    -- If the delete operation succeeds, commit the transaction.
    COMMIT TRANSACTION;
END TRY
BEGIN CATCH
    -- Call procedure to print error information.
    EXECUTE dbo.uspPrintError;

    -- Roll back any active or uncommittable transactions before
    -- inserting information in the ErrorLog.
    IF XACT_STATE() <> 0
    BEGIN
        ROLLBACK TRANSACTION;
    END

    EXECUTE dbo.uspLogError @ErrorLogID = @ErrorLogID OUTPUT;
END CATCH;

-- Retrieve logged error information.
SELECT * FROM dbo.ErrorLog WHERE ErrorLogID = @ErrorLogID;
GO

Can someone answer these following questions:-

What is FaultException (WCF related)?

When does it occur; as in, is it a problem related to service configurations or is it an error in program logic?

http://msdn.microsoft.com/en-us/library/system.servicemodel.faultexception.aspx[^]

Bastard Programmer from Hell Suspicious | :suss:

If you can't read my code, try converting it here[^]
They hate us for our freedom![^]

The thing is I went there before I came here. I want some meaty explanation(from practical experience) rather than the cut and dried documentation provided by Microsoft.

PS:Seeing those huge tables and lists at the start of the page itself was a huge turnoff. Hmmm | :|

Hi All ... in my form app. i have textboxs related databindings yonet_ogrt and I have 2 datagridview yonet_prg
and yonet_nbt.. so I want to all together navigate but textboxs and datagridview related yonet_prg is working but
datagridview related yonet_nbt not working... this is my trouble...
My code like this...

public void vt_iliski()
{
try
{
string sorgu_ogretmen = "select * from ogretmen";
string sorgu_program = "select * from program";
string sorgu_nobet = "select * from nobet";

ds_gnd = new DataSet();
DataTable tablo = new DataTable();
adpt_ogrt = new SqlCeDataAdapter(sorgu_ogretmen, baglan());
adpt_prg = new SqlCeDataAdapter(sorgu_program, baglan());
adpt_nbt = new SqlCeDataAdapter(sorgu_nobet, baglan());

adpt_ogrt.Fill(ds_gnd, "ogretmen");
adpt_prg.Fill(ds_gnd, "program");
adpt_nbt.Fill(ds_gnd, "nobet");

/* ********** relation -1 ****************** */

DataColumn ogrt_kolon = ds_gnd.Tables["ogretmen"].Columns["ogrt_ID"];
DataColumn prg_kolon = ds_gnd.Tables["program"].Columns["ogrt_ID"];

iliski1 = new DataRelation("Ogretmen_To_Program", ogrt_kolon, prg_kolon);

ForeignKeyConstraint kisitla = new ForeignKeyConstraint(ogrt_kolon, prg_kolon);

kisitla.UpdateRule = Rule.Cascade;
kisitla.DeleteRule = Rule.Cascade;
kisitla.AcceptRejectRule = AcceptRejectRule.Cascade;

ds_gnd.Tables["program"].Constraints.Add(kisitla);
ds_gnd.EnforceConstraints = true;

ds_gnd.Relations.Add(iliski1);

yonet_ogrt = new BindingSource(ds_gnd, ds_gnd.Tables["ogretmen"].ToString());
yonet_prg = new BindingSource(yonet_ogrt, "Ogretmen_To_Program");

/* ********** relation-2 ****************** */
DataColumn prg_kolon_nobet = ds_gnd.Tables["program"].Columns["prg_ID"];
DataColumn nobet_kolon = ds_gnd.Tables["nobet"].Columns["prg_ID"];

iliski2 = new DataRelation("Program_To_nobet",prg_kolon_nobet , nobet_kolon );

ForeignKeyConstraint kisitla2 = new ForeignKeyConstraint(prg_kolon_nobet, nobet_kolon);

kisitla2.UpdateRule = Rule.Cascade;
kisitla2.DeleteRule = Rule.Cascade;
kisitla2.AcceptRejectRule = AcceptRejectRule.Cascade;

ds_gnd.Tables["nobet"].Constraints.Add(kisitla2);
ds_gnd.EnforceConstraints = true;

ds_gnd.Relations.Add(iliski2);

yonet_prg = new BindingSource(ds_gnd, ds_gnd.Tables["Program"] .ToString());

yonet_nbt = new BindingSource(yonet_prg , "Program_To_nobet");

}
catch (Exception hata)
{
MessageBox.Show("Okul Günlük Nöbet Defteri iliskilendirme Hatasi olustu : " + hata.Message + " " + hata.StackTrace );

}

finally
{
baglanti.Dispose();
adpt_ogrt.Dispose();
adpt_prg.Dispose();
adpt_nbt.Dispose();

}

I think the mistake lies in your DataAdapter.Fill() function. As far as I know only overload for Fill() that accepts 2 arguments is

Fill(DataTable, IDataReader)

Have a look at this page for further clarification:
http://msdn.microsoft.com/en-us/library/system.data.common.dataadapter.fill.aspx[^]
Otherwise the rest of the code looks fine.

The following subquery returns 1024 records with a single count column. I am trying to return multiple columns with 1024 records. When I make changes to return multiple columns I get 17,000 records instead of 1024 records. I have very litle experience with subqueries. Does anyone have any suggestions?

SELECT IFNULL(COUNT(DISTINCT A.computerid),0) AS 'Machine Count',
A.hotfixID AS 'Last Contact'
FROM (SELECT HF.computerid, HF.hotfixID
FROM hotfixdata HFD

INNER JOIN hotfix HF
ON HF.hotfixid = HFD.hotfixid
AND HFD.ignore <> 1
LEFT OUTER JOIN Computers AS C
ON C.ComputerID=HF.ComputerID

WHERE INSTR(C.os,"microsoft")>0
AND HF.installed <> 1
AND HF.Approved = 1
GROUP BY HF.hotfixID, HF.ComputerID) A;

Yup[^]

Bastard Programmer from Hell Suspicious | :suss:

If you can't read my code, try converting it here[^]
They hate us for our freedom![^]

I have a class and the data in it has to be stored in the database. I have done this by extracting every single property and sending each of them as input parameters to a stored procedure in the database. But the thing is that the class has too many properties. Is there any way to accomplish this in a single go(lesser amount of code)? OH and I am using C# and Sql Server!

Presumably it throws an exception and posting that exception as part of your post is helpful.

Presuming that the exception is telling you the statement is too big...

If your SQL statement is too long then SQL/C# will have a problem with it. The solution is to reduce the size. (Might note that that could indicate a database design issue as well.)

Using the database import tools (sqlldr?) might help with the problem but might not. If not or you don't want to use it then solutions.
1. Do two calls.
2. Pass in a blob and parse it to create dynamic sql.

If it was me I would presume that there is a design issue.

As has been mentioned, if the table has too many field then there is probably a design problem.

Communication with the database is donkey work, most developers use or write a code generator for this. I have not hand coded DAL for many years.

Never underestimate the power of human stupidity
RAH

The thing is I am still new. Is it not good that we do more of the grunt work at the starting stages itself? And DAL coding is quite hectic. Sometimes I really feel why do we need it anyway. Thank you for eye opener atleast.

First, I am an absolute "database-beginner" Smile | :)

Here is my szenario in my daily business-live:

I have a lot (~30) different datatables which I combine to produce usefull-information.

The main topics are:
a)
My datatables are stored in xml-files. The xml-files are actually generated by reading out information from other tools in my business

b)
For the "production of usefull information" (this is reporting) I use my own proprietary C#-Programs, where I perform "the logic". Means: Filtering, Joining, Combining,.....

c)
The final result is written into Excel-Sheets. The end-users use these excel-files for their needs

Here is my question:

Especially, step b, with my proprietary C#-Programs needs a lot of time for maintenance/updates/.... due to heavily changing environment. It is time-consuming to maintain it.

How do "professional database-engineers" handle such a task?. What is their approach? Which tools are they using?

modified 9-Nov-12 7:14am.

Search a topic like "Business Intelligence" and you will get an idea of what others are doing.

At a high level, you have a central database which collects data from different systems, then you have reporting tools which either you or your user community can write their own reports. Also, sometimes you can have these reports run on a scheduled basis and have their output delivered to whoever needs it.

The cost of implementing such a system can be quite high.

You might want to implement some pieces of this.

For example:
1) Build a tool which will load your data extracts (xml files) into a central database.
2) Create views or stored procedures which "normalize" your data
3) Use a reporting tool to generate the reports you need or show your users how they can connect to the central database via Excel to get their own data. (See topics like Microsoft Query)

Empower the user to access the data and you will spend less time on maintenance.

Good luck.
Thumbs Up | :thumbsup:

Frygreen wrote:
My datatables are stored in xml-files. The xml-files are actually generated by reading out information from other tools in my business

This is just wrong - extracting data from other tools is valid, moving them to xml files is probably the worst platform to work from.

Get hold of sql server, use Express if cost is an issue (has a size limit of 4gb). Your current xml files can be loaded into tables in a sql sever database.

I would seriously think about getting someone to normalise and organise your data for you it is a non trivial job. Although if you have already done this with xml you may be able to handle it.

Use SQL Server Reporting Services SSRS to produce your canned reports (no analysis or drill down) and look into ~~Integration~~ Analysis Services for data analysis beyond the static reporting requirement.

I may sound SQL Server centric b/c I am, it is by far the best tool for departmental database processing. Don't piss about with Access or Excel go straight for the professional tools.

Never underestimate the power of human stupidity
RAH

Thank you for your first replys. I got some ideas.

But, of course, more replys are welcome Smile | :)

we are using sql server 2008 in desktop application but client machine my database show i want database not show and secure my database please tell me what can i do.

thanks

badal

You can't "hide" your database, you need to apply authentication and authorisation to your database. This will limit what the user can see and do.

Never underestimate the power of human stupidity
RAH

Best as I can tell from your question you are asking for something that is impossible.

SQL Server normally installs as an application. Thus it is ALWAYS visible on the client machine.

Now you could re-architect your application to use the embedded version of SQL Server (I think.) Then it would appear that only your application existed. I suspect this would require a bit of work. There are limitations to that approach.

Note as well that this has nothing to do with security. Security means something completely different.

Hi My sql expired and remove it completely from my hard drive.
Sql Server 2008 r2 how Registry files deleted. Where do I find these files.

My Windows 7.

Thank you. Poke tongue | ;-P

C:\users\Myusername\ntuser.dat and c:\Windows\System32\config\

<edit>You probably shouldn't remove these files.</edit>

People say nothing is impossible, but I do nothing every day.

Goto registry search for: 10.50.1600.1 by select F3.