Database

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17-Dec-04 2:13

You would use a self-referential join. In other words you join the table to itself.

Category
---------------------------------------
ID                int not null
Name              nvarchar(256) not null
ParentCategoryID  int null

The ParentCategoryID is a foreignkey that refers to the ID column in Category. If it is null then it is a root category, if it has a parent then it is a sub-category. You can go as deep as you want (2billion+ subcategories deep if you need it)

This design also does away with the category and sub-category tables and replaces it with just one. Unless you need extra/different things in category and subcategory I'd stick with my design above, if category and sub-category require a different set of columns then the design will have to be with two tables.

Does this help?

UNC required ???

Vector716-Dec-04 23:39

16-Dec-04 23:39

Have a problem with the Server.MapPath command.

This works on the local ServerA

Server.MapPath("\FSDIR\WORK\track.mdb");

If I want access it from ServerB, programm requires UNC path. This is UNC, isn't it ? He doesn't accept \\ServerB

Server.MapPath("\\ServerB\FSDIR\WORK\track.mdb");

Background :

I have a Connectionstring and need access to an external server. Is there another method to do this ? Has anybody an example for a connectionstring which handles external access ?

Re: UNC required ???

Colin Angus Mackay17-Dec-04 2:15

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17-Dec-04 2:15

This is the forum for ADO.NET. You should post in the ASP.NET[^] forum.

Re: UNC required ???

Jon Hulatt17-Dec-04 3:50

Jon Hulatt

17-Dec-04 3:50

It's almost certainly a permissions problem.

IIS runs as an anonymous user, which probably won't have access to your share.

Try enabled NTLM (Integrated Windows Authentication) on your webserver, and then logging into your web application like that. IIS will then use your credentials, and it'll probably work.

using System.Beer;

Re: UNC required ???

Colin Angus Mackay17-Dec-04 4:11

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17-Dec-04 4:11

Jon Hulatt wrote:
IIS runs as an anonymous user, which probably won't have access to your share.

IIS runs as a special user, not anonymous. The user name is different depending on the version of windows being used. In IIS you can set which user will be used when the end user is logged on as anonymous. This user can be configured as a domain user, by default it is a machine user.

MSDE Inquiry

Member 150205616-Dec-04 21:49

Member 1502056

16-Dec-04 21:49

Is Microsoft SQL Desktop Engine comes along with the distribution of VS.net 2002? I really do not know how to identify such. After installing VS.net 2002, I do not get any SQL shortcut or executable for me to access it. Or I have to download it from Microsoft's Site?

And another thing, in case I got MSDE or Microsoft SQL server express 2005, is it possible to package it with local based application using it as its database? Just MSAccess where you do not need to install access to a local computer for your program to run?

Thank you in advance for your helps.

I just have to know

Colin Angus Mackay17-Dec-04 2:20

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17-Dec-04 2:20

aarontlu wrote:
Is Microsoft SQL Desktop Engine comes along with the distribution of VS.net 2002? I really do not know how to identify such. After installing VS.net 2002, I do not get any SQL shortcut or executable for me to access it. Or I have to download it from Microsoft's Site?

I found a message in my Visual Studio install that reads: Visual Studio .NET 2003 does not include Microsoft SQL Server Desktop Engine (MSDE). To download MSDE, go to http://go.microsoft.com/fwlink/?linkid=13962[^]. So, yes you have to download it.

aarontlu wrote:
is it possible to package it with local based application using it as its database?

Yes. There should be some instructions that come with it. If not, there there are a few articles about it[^].

Does this help?

Member 150205617-Dec-04 13:29

Member 1502056

17-Dec-04 13:29

aarontlu wrote:
is it possible to package it with local based application using it as its database?
collin wrote:
Yes. There should be some instructions that come with it. If not, there there are a few articles about it[^].

Thank you very much, these things save me a lot of time. And I'm planning ahead for future project. About local use of the SQL Desktop Engine, I have 2 questions..

1. Is it the same if I use Sql Server express 2005?
2. Will it act like access where I do not need to install the Sql Server Express 2005 on the computer that I'm installing my program on?

Your help are fully appreciated Smile | :)

I just have to know

Colin Angus Mackay17-Dec-04 13:32

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17-Dec-04 13:32

For both your follow up questions I have no idea. I've not had much time to look into the new features of SQL Server 2005 or the licensing/deployment model that it will use.

Rob Graham24-Dec-04 6:08

Rob Graham

24-Dec-04 6:08

1. No. SQL server exress 2005 is a newer version of SQL server (Yukon - not yet released) than the MSDE distributed with VS. Net 2003 (SQL 2000). Most SQL 2000 functions should work the same on Yukon (It is backwards compatible), but there is no gaurantee at this point since it is not released.

2. No it will not work like Access, you will need to install the server if it is not already present, and attach or create your database to the server.

Why would anyone waste time arguing with an accountant about anything? Their sole function is to record what happenned, and any higher aspirations are mere delusions of grandeur. On the ladder of productive contributions they are the little rubber pads at the bottom that keep the thing from sliding out from under you. - Roger Wright

ListView Control

RogerDodge16-Dec-04 21:41

RogerDodge

16-Dec-04 21:41

I'm new to .NET and C# coming from VisualFox background.

I'm having a tough time with this control, namely determining which row has been selected.

I have four columns, three of which are visible, the fourth contains an id which becomes the parameter to a Stored Procedure which then populates a DataGrid.

e.g.

private void listView2_SelectedIndexChanged(object sender, System.EventArgs e)
{
cmdSelectZoneCosts.Parameters["@zoneid"].Value=this.listView2.SelectedItems[0].SubItems[3].Text;
dsZoneCosts.Clear();
daZoneCosts.Fill(dsZoneCosts, "ZoneCosts");
}

For some reason, the code is executed TWICE(?) the first time the .SelectItems.Count = 0 which crashes the line. If I "trap" for that i.e.

if (this.listView2.SelectedItems.Count !=0)
{
cmdSelectZoneCosts.Parameters["@zoneid"].Value=this.listView2.SelectedItems[0].SubItems[3].Text;
dsZoneCosts.Clear();
daZoneCosts.Fill(dsZoneCosts, "ZoneCosts");
}

It works this way, but why is it running the code twice ??

Can anyone point me in the right direction to a sample walkthrough of a simple form which will display records from a database, Add, Edit, Delete functions.

Roger

SQL Syntax Error

Suresh Prasad16-Dec-04 19:48

Suresh Prasad

16-Dec-04 19:48

Can any one help me with the following SQL statement. I am getting a syntax error. I am trying to update fields in a access database. Thanks

strSQL = "UPDATE tblSetup SET"
strSQL = strSQL & "tblSetup.Company_Name = '" & txtName & "',"
strSQL = strSQL & "WHERE tblSetup.Company_ID = '" & txtID & "'"

Re: SQL Syntax Error

Colin Angus Mackay17-Dec-04 2:24

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17-Dec-04 2:24

There are no spaces between SET and tblSetup. Also there is a spurious comma just before the WHERE. Finally, your SQL is highly susceptable to SQL Injection Attack. You may wish to read up on what SQL Injection attacks are, and how to prevent them.[^]

Does this help?

Re: SQL Syntax Error

Suresh Prasad17-Dec-04 4:06

Suresh Prasad

17-Dec-04 4:06

Thanks. I will try it out.

Datagrid update

Yulianto.16-Dec-04 16:15

Yulianto.

16-Dec-04 16:15

I`m new to ADO.NET, can we update a table from the datagrid? Thanks

<italic>Work hard and a bit of luck is the key to success.

You don`t need to be genius, to be rich.

Re: Datagrid update

Veera Raghavendra16-Dec-04 17:20

Veera Raghavendra

16-Dec-04 17:20

You can update the database from the datagrid it is possible in web.ui.datagrid.u must use the templates of datagrid properties Poke tongue | ;-P

e.veera raghavendra

Generating wrapper code for SQL Server Stored Procedure

Fraas16-Dec-04 15:32

Fraas

16-Dec-04 15:32

How Can I Generating wrapper code for SQL Server Stored Procedure ??

If You will Go To The Following link you will see an example for Generating wrapper code for Oracle Database .. And Also the author say there is built in tool for Generating wrapper code for SQL Server
http://www.codeproject.com/vb/net/OracleSPWrapper.asp
my question .. where is this tools ???

and thanks with my regarding

Fraas

"Artificial" Server" -beginner question

Anonymous16-Dec-04 13:49

Anonymous

16-Dec-04 13:49

I want to practice my SQL on Excel spreadsheets. When I have a project open in VS2003.NET and open the 'Server Explorer' window, it tells me (as it should) that there are no SQL Servers to connect to.
When I was learning SQL in school we would connect to the Oracle 9 Database on the Network. Now I want to continue practicing SQL/C#, but have no network/database or internet connectivity.
Is there a way I can add an add an "SQL Server" to this path when in fact the "Server" is located on the same laptop.
Please forgive my ignorance on the subject. I'm in no way pretending to know what I'm talking about but very much want to learn...

thanks for your time....

Server Object - Where to find the Dll ?

Vector715-Dec-04 22:37

15-Dec-04 22:37

Hello,

I want to use the command Server.MapPath and need the Server object. Where I can found it for reference ?

Heath Stewart15-Dec-04 23:17

Heath Stewart

15-Dec-04 23:17

The Server property is an intrinsic object accessible from within ASP.NET. You cannot simply use Server.MapPath (which is actually HttpServerUtility.MapPath) because 1) it's an instance method and you cannot instantiate the HttpServerUtility class yourself, and 2) it only works with a given virtual path because it needs to map a virtual path to a physical path. This is specific to both the virtual host and the virtual directory. Even on two different virtual hosts, a virtual directory will map differently to the same physical directory.

For future reference, if you have a question about what assembly a class (not object, which is an instance of a class) is defined in, you can view the bottom of the class documentation topic in the .NET Framework SDK that states what namespace and in what assembly the class (or any Type) is defined.

This posting is provided "AS IS" with no warranties, and confers no rights.

Software Design Engineer
Developer Division Sustained Engineering
Microsoft

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Vector716-Dec-04 1:45

16-Dec-04 1:45

Hello, thx for response. Yes I am working on an ASP.NET project and need the MapPath Method. But if I cannot instantiate it, i have no possibilities accessing it ?

Colin Angus Mackay16-Dec-04 2:34

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16-Dec-04 2:34

Vector7 wrote:
Yes I am working on an ASP.NET project and need the MapPath Method. But if I cannot instantiate it, i have no possibilities accessing it ?

Did you read what Heath said? You cannot instantiate it. It is created by the framework for you.

In your page class there is a property called Server[^] which exposes a pre-existing instance of the class which you can use.

Vector716-Dec-04 3:58

16-Dec-04 3:58

I have read it, but still not the correct hint.

This is what I've looked for :

HttpContext.Current.Server.MapPath Smile | :)

Because I didn't found the Server object, I thought I need an explicit IIS dll. But now I found this in the web by chance ( all other places show System.MapPath instead the right ASP.NET Version ).