Database

Problem in using Stream object's write method

16-Feb-04 2:34

Hi,

Is this C#? If so, you need a concatination operator (+) between each pair of strings that you want to concatination:

SqlString = "SELECT Start1, End1, Start2, End2, Start3, End3, Start4, " +
"End4, Start5, End5, Start6, End6, Start7, End7, Start8, End8, " +

Bill

Free C# training

Anonymous15-Feb-04 15:14

Anonymous

15-Feb-04 15:14

http://www.dotnetspider.com/technology/ Rose | [Rose]

Re: Free C# training

John Kuhn16-Feb-04 11:49

John Kuhn

16-Feb-04 11:49

How about not posting the same advertisement in every single forum?

Hey, how about no advertising at all?

Member 48497613-Feb-04 21:15

Member 484976

13-Feb-04 21:15

I want to write some long encryted text during my code in .doc file. I have used Stream Object and use write() method of stream object which take object of type variant as input. MY code throws exception 0x800A0BB9 when it execute write() method. Below is my code. I have spend around 1.5 days in this. Pls help me how to solve this.
If i read text from some other using Read() method of Stream object and use output of Read() method (i.e. output of Read() is Variant object) then it work find and write() is not throwing exception.

CString outileName = "myenc.doc";
ADODB::_StreamPtr outputStream = NULL;
hr = outputStream.CreateInstance(__uuidof(ADODB::Stream));
outputStream->Charset = "ascii" ;//"iso-8859-1";
outputStream->Type = ADODB::adTypeBinary;
outputStream->Open(vtEmpty, ADODB::adModeUnknown, ADODB::adOpenStreamUnspecified,bstrEmpty, bstrEmpty);

outputStream->Position = 0;

VARIANT myVt;
VariantInit(&myVt);
myVt.vt = VT_BSTR;
myVt.bstrVal = SysAllocString(L"testing");

outputStream->SaveToFile(outileName.AllocSysString(), ADODB::adSaveCreateOverWrite);

outputStream->Write(&myVt);

ODBC and TCP/IP

Kwai Cheng Kane13-Feb-04 10:25

Kwai Cheng Kane

13-Feb-04 10:25

I am using the ODBC classes in ADO.NET. I just found that some connections being made by a database maintenance program I am writing are connecting to the wrong server because they are using named pipes rather than connecting through TCP/IP using the DSN I have set up on my system.

Is there a way to FORCE the connection to always use the TCP/IP connection and never use the named pipes??? Using named pipes for this particular program can be dangerous because the program is a database management program, and it is designed connect to the desired database exclusively using the DSN. If it uses a named pipe to connect, then it could perform maintenance on the wrong database with disasterous results!!!

Listing tables and views?

Bill Dean13-Feb-04 8:08

13-Feb-04 8:08

Hi all,

I have an OleDbConnection object and I would like to be able to get a list of all the tables and views available through it.

Do I need to know anything about the underlying database architecture to do this? For example, if it were mssql, I would know to query sysobjects. But if I do not know where the underlying database stores the data am I SOL?

I suspect the answer is "no" because I can get a list of tables and views when I add this data connection to my server explorer in VS.NET but I haven't a clue how the do it in code.

Thanks in advance,
Bill

-Dr_X-13-Feb-04 14:27

-Dr_X-

13-Feb-04 14:27

The easiest way is to use the following query.

Select name, type from Sysobjects
where	type = 'U' 
or type = 'V'

The other way is to use ADOX. However, I have not used it in .Net only in the old VB world.

Michael

Bill Dean13-Feb-04 15:08

13-Feb-04 15:08

Michael,

Thanks for the response! I did not realize it was that easy.

Bill

-Dr_X-13-Feb-04 15:36

-Dr_X-

13-Feb-04 15:36

I would recommend doing this from a stored procedure.
Really don't want users messing around with sysobjects unless there very knowlegeable.

Michael

Bill Dean13-Feb-04 15:43

compare time part of datetime field

13-Feb-04 15:43

If I had sql server on the back-end...I would. But we are trying to get at data in Informix...which as far as I know doesn't support sprocs.

Like I said before, I really a complete novice with this particular back-end so I was looking for a way to do this that generalized to all ado.net.

Your suggestion works great btw, even with the Informix back-end. Thanks again.

Bill

asd175313-Feb-04 7:15

asd1753

13-Feb-04 7:15

hi how can i compare time part of datetime field, for exaple :
time of datetimefield between '12:24:36' and '18:50:25'
thank you Rose | [Rose]

precentage of loading data in Dataset

Saeed Tabrizi13-Feb-04 5:43

Saeed Tabrizi

13-Feb-04 5:43

Please Tell to me how can i make a progress bar control for showing the loaded data ine dataset or all data in any winforms.
cause this work is easy in the ado classic .
but i cant find any method or event or object for this problem .

so thanks
Saeed Sa_tabrizi@yahoo.com Smile | :)

"Select top" command

dlhson212-Feb-04 19:21

dlhson2

12-Feb-04 19:21

I cannot create a stored procedure like that:

CREATE PROCEDURE sp_GetLatestNews<br />
@nCount int<br />
AS<br />
	Select top @nCount * from NEWS <br />
GO

But I CAN do like that:

CREATE PROCEDURE sp_GetLatestNews<br />
@nCount int<br />
AS<br />
	Select top 5 * from NEWS <br />
GO

How can I throw a parameter to "Select TOP" command Confused | :confused:

=======================
Nothing is perfect

Motyka12-Feb-04 20:52

Motyka

12-Feb-04 20:52

CREATE PROCEDURE sp_GetLatestNews
@nCount int
AS
SET ROWCOUNT @nCount
Select * from NEWS
SET ROWCOUNT 0
GO

basementman13-Feb-04 5:58

basementman

13-Feb-04 5:58

CREATE PROCEDURE sp_GetLatestNews
@nCount int
AS
declare @cCount varchar(10)
select @cCount = Convert(varchar(10),@nCount)
exec ('select top ' + @cCount + ' * from NEWS')
GO

onwards and upwards...

Bruce Duncan13-Feb-04 6:49

Bruce Duncan

13-Feb-04 6:49

As the other two replies mentioned, you can use the SET ROWCOUNT statement or construct and execute a sql statement dynamically.

But I read the other day the Yukon will allow expressions to be used as an argument to the TOP statement.

This is from http://msdn.microsoft.com/msdnmag/issues/04/02/TSQLinYukon/default.aspx[^]

"The T-SQL TOP option in Yukon has two significant enhancements. You can now specify as an argument to TOP an expression that can contain variables or even a self-contained query. You can also use the TOP option with modifying DML (INSERT, UPDATE, DELETE).

To specify an expression, you must enclose it in parentheses. The expression should be of the BIGINT datatype when not using the PERCENT option, and a float value in the range 0 through 100 when using the PERCENT option. The following code shows how to use an expression with a variable to return the requested number of earliest orders from the SalesOrderHeader in the AdventureWorks database:"

USE AdventureWorks

DECLARE @n AS BIGINT
SET @n = 5

SELECT TOP (@n) *
FROM SalesOrderHeader AS SOH
ORDER BY OrderDate, SalesOrderID

Searching the web without Google is like straining sewage with your teeth.
Userfriendly, 2003/06/07

dlhson213-Feb-04 17:01

dlhson2

13-Feb-04 17:01

I wondered that what is faster in executing?

CREATE PROCEDURE sp_GetLatestNews <br />
@nCount int <br />
AS <br />
SET ROWCOUNT @nCount <br />
Select * from NEWS <br />
SET ROWCOUNT 0 <br />
GO

CREATE PROCEDURE sp_GetLatestNews <br />
@nCount int <br />
AS <br />
declare @cCount varchar(10) <br />
select @cCount = Convert(varchar(10),@nCount) <br />
exec ('select top ' + @cCount + ' * from NEWS') <br />
GO

And what is T-SQL ? Help me !

=======================
Nothing is perfect