Database

Colin Angus Mackay16-Jul-06 23:05

16-Jul-06 23:05

dobrzan wrote:
How can I add relationship from "document" table to SQL server login?

What sort of relationship? You can, of couse, use commands like:

GRANT SELECT ON Document TO AuthorUserName

See also: GRANT[^] DENY[^] and REVOKE[^]

If this is not what you want you will have to explain what you want to do with this "relationship"

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dobrzan17-Jul-06 4:09

dobrzan

17-Jul-06 4:09

What I need is to extend the basic login/account.
There is a number of accounts/logins that have access to database.
Each user (which is a login/account) can do some things depending on other data collected in database.
Example:
There is a "customer" table in database. Each "customer" can order "product". There is relationship between customer and product - lets say it's done by "order" table.
Now when customer connect to database (using his SQL Server login) I want to have a view that shows what "product" "customer" ordered. So there must be a some kind of way to link SQL Server login with entries from "customer" table.
It's quiet simple thing, when I log to codeproject I can track my posts. I can do that without SQL Server, but I want to create secure app - based on SQL Server Login authentication.

Colin Angus Mackay17-Jul-06 5:22

17-Jul-06 5:22

Since all this will be done through an application* you let the business logic in the application (or in stored procedures) filter the data returned to the user of the application.

dobrzan wrote:
but I want to create secure app - based on SQL Server Login authentication.

Current advice is not to use SQL Server Authentication unless you are connecting it to systems that are not windows based. You should be using trusted connections with Windows Authentication. What you are suggesting is less likely to secure your system because your users will have some direct access to your SQL Server (even if they don't know it). This access can be used by an attacker to compromise your system. All an attacker needs is an account to your application and you automatically give them an account to the datbase.

If you have a web application, it will probably try to connect to SQL Server using the ASPNET account if you let it use a trusted connection. Let it do that. Create your own user tables to handle the users of your application. Do not use the sysusers table in SQL Server, it is not designed for that purpose.

you are not going to give your customers direct logins to your SQL Server as that would be nuts - Imagine if Code Project added a login in its SQL Server for each of its 3million+ members - it also screws with connection pooling making it very inefficient

dobrzan17-Jul-06 20:47

dobrzan

17-Jul-06 20:47

So you suggest that I should use one login or windows based auth. to give users access to database (SQL Server) and distinguish each user by my own login logic in my app or web page.
Am I right?
Is this what others do?

Anyway thanks for help.

Colin Angus Mackay17-Jul-06 22:18

How to convert diagrams to SqlServer 2005?

17-Jul-06 22:18

dobrzan wrote:
So you suggest that I should use one login or windows based auth. to give users access to database (SQL Server) and distinguish each user by my own login logic in my app or web page.

Yes.

dobrzan wrote:
Is this what others do?

Of course.

Reza Raad16-Jul-06 21:46

Reza Raad

16-Jul-06 21:46

Hi i opened one of my sqlserver 2000 databases with sqlserver 2005 without any problem,
but i can't see my database diagrams,and i can't create new diagram there.

please help me.
thanks is in forward.

Re: How to convert diagrams to SqlServer 2005?

Colin Angus Mackay16-Jul-06 23:01

Re: How to convert diagrams to SqlServer 2005?

16-Jul-06 23:01

This is not supported. The SQL Server 2005 tools cannot show, modify or create diagrams in a SQL Server 2000 database.

Reza Raad17-Jul-06 0:03

Reza Raad

17-Jul-06 0:03

thanks for your attention and your reply Smile | :)

but if i create and modify tables form 2005 and create and modify diagram from 2000.does any problem occure or not problem?

thanks again.

Human knowlege belongs to the world

Why can't use 2 DataReader with same connection

Heinz_16-Jul-06 21:41

Re: Why can't use 2 DataReader with same connection

16-Jul-06 21:41

That's it, Why can't i use 2 DataReader with same connection? How can i do multiple queries from the same connection.

Thanks.

Colin Angus Mackay16-Jul-06 23:00

Re: Why can't use 2 DataReader with same connection

16-Jul-06 23:00

Heinz_ wrote:
How can i do multiple queries from the same connection

Just open a second identical connection to run the second command.

Heinz_17-Jul-06 9:26

Re: Why can't use 2 DataReader with same connection

17-Jul-06 9:26

Hi, i just did it but that second connection is what i have been trying to avoid. I remember that with ADODB in VB6 i was able to do multiple command and reads from the same connection.

Thanx, it works this way anyway.

Colin Angus Mackay17-Jul-06 9:32

17-Jul-06 9:32

Heinz_ wrote:
i just did it but that second connection is what i have been trying to avoid.

Why?

Heinz_ wrote:
I remember that with ADODB in VB6 i was able to do multiple command and reads from the same connection.

ADO.NET is not ADODB.

To clarify

Ennis Ray Lynch, Jr.17-Jul-06 9:37

Ennis Ray Lynch, Jr.

17-Jul-06 9:37

If you have a connection you can execute multiple commands on it. Also, keep in mind, that idenctical connection strings will use the connection pool.

A man said to the universe:
"Sir I exist!"
"However," replied the Universe, "The fact has not created in me A sense of obligation."

-- Stephen Crane

Re: To clarify

Colin Angus Mackay17-Jul-06 11:01

Re: To clarify [modified]

17-Jul-06 11:01

Ennis Ray Lynch, Jr. wrote:
If you have a connection you can execute multiple commands on it

But not at the same time, which is what the OP wanted to do.

Ennis Ray Lynch, Jr. wrote:
Also, keep in mind, that idenctical connection strings will use the connection pool.

Absolutely!

Heinz_18-Jul-06 8:25

18-Jul-06 8:25

Understood.

I was trying to use only one connection to gain performance but now i replaced the second connection with a subquery in a command of the original connection, check this tasty and parameter rich query:

"select SUM(t1.total - COALESCE(t2sum,0)) from ventas as t1 left join (select venta, SUM(cantidad_pagada) as t2sum from pagos_ventas where fecha_pago='" + CDC.Global.SetDBdate(hoy) + "' and metodo_pago<>1 and metodo_pago<>7 group by venta) as t2 on t2.venta=t1.id where t1.nula=0 and t1.pagada=0 and t1.fecha='" + CDC.Global.SetDBdate(hoy) + "'"

Bye.

-- modified at 15:29 Tuesday 18th July, 2006

Re: To clarify

Colin Angus Mackay18-Jul-06 12:31

18-Jul-06 12:31

I don't see any parameters in your query - What I do see is lots of SQL Injection that is ripe for attack.

A parameter is something like this:

SELECT * FROM Table WHERE something = @Parameter

@Parameter is the parameter.

You might like to read about SQL Injection Attacks, what they are, what damage they can do, and most importantly, how to prevent them: http://www.codeproject.com/cs/database/SqlInjectionAttacks.asp[^]

Re: To clarify

Heinz_18-Jul-06 13:59

Re: Why can't use 2 DataReader with same connection

18-Jul-06 13:59

Hi, i used the wrong word but you know what i mean, thanks for the link.

sampathkumarg19-Jul-06 8:34

sampathkumarg

19-Jul-06 8:34

Multiple Active Result Sets (MARS). Probable you need ADO.Net 2.0.

Save Changes

slSoftware16-Jul-06 21:25

slSoftware

16-Jul-06 21:25

Hi everyone!

I need to display the save changes message box in my windows form if user try to close the form without saving data.so can anyone help me to do this pls/ Smile | :)

Re: Save Changes

Colin Angus Mackay16-Jul-06 22:58