|
Yeah it's easy 
To create a relationship between 2 datasets create a datarelation. Look in the Visual Studios help index for datasets, relationships
Thier example is as follows.
Dim CustomersOrders As New DataRelation("CustomersOrders", _
DsNorthwind1.Customers.Columns("CustomerID"), _
DsNorthwind1.Orders.Columns("CustomerID"))
DsNorthwind1.Relations.Add(CustomersOrders)
"People who never make mistakes, never do anything."
My blog
http://toddsnotsoamazinglife.blogspot.com/
|
|
|
|
|
I am using VC++ dot NET, and am trying to use GetRows to populate an array with the rows from one of the columns in a table. My adodb recordset contains the data. I know the recordset has
200 rows in one column, so I have:
float data[200]; <br />
data = p_myRecSetPtr->GetRows(-1);
and I get the error: "error C2440: '=' : cannot convert from '_variant_t' to 'float []'"
I tried casting the result but couldn't get it to work right.
Does anyone know how to solve this problem? or possibly what cast I need to use?
|
|
|
|
|
Yes, you need to do this:
_variant_t vt = p_myRecSetPtr->GetRows(-1);
You can't magically change what the function returns. It's probably a SAFEARRAY, which has a nice wrapper class, called CComSafeArray from memory.
Christian Graus - Microsoft MVP - C++
|
|
|
|
|
Hi
I have to create an MDB file and then create a table in it.
I have successfully been able to do this task in a simple web-application.
But when I do the same thing in a webservice it creates the MDB file but gives me an error while opening the connection to this file with no details just saying "Unspecified error".
I have checked for the ASP.NET permissions.
string connection = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source= ";
connection += "C:\\Projects\\Data\\Data.mdb";
string error = "";
OleDbConnection conn = new OleDbConnection();
try
{
conn.ConnectionString =connection;
conn.Open();
}
catch(Exception Ex)
{
error = Ex.Message;
}
|
|
|
|
|
Hi,
If you want to access an Access database from an ASPX page, you must add to your connection string "User Id=admin;Password=;" for a standard security access.
Of course, the ASP.NET user (under winxp) must have enough rigths on the .mdb file.
I hope this will help you,
Regards.
PS: for more details on connection strings, check http://www.connectionstrings.com/[^]
jmarzou
|
|
|
|
|
I want to update a table in database.
The datasource is a xml file , which read by dataset.
How to update the table ?
I use these code,
Dim cmd As New OleDbCommand
cmd.Connection = cn
cmd.CommandText = "select * from " + m_tablename
Dim da As New OleDbDataAdapter
da.SelectCommand = cmd
Dim ds As New DataSet
da.Fill(ds)
ds.Clear()
ds.ReadXml(m_xmlname)
da.Update(ds, m_tablename)
However, the database do not be updated.
Please help me.
Thanks!
|
|
|
|
|
Hi,
I am trying to create a job ,use Activex Script (VBScript) as language at first step of my job. But i can not make it work.If i write:
'--------
Dim value1
value1="something else"
'----------
it works but, if i write something complex it fails:
'-----------
Set fs=Server.CreateObject("Scripting.FileSystemObject")
Set f=fs.OpenTextFile("c:\\test.txt",1)
f.ReadAll
f.Close
Set f=Nothing
Set fs=Nothing
'-----------
Would someone give me some working code or tell me the probable mistake that i make?
Thanx in advance..
--junior coder--
|
|
|
|
|
Hi all thanks for reading. I am kinda new to stored procedures and need a bit of help. I am calling a stored procedure which I send 2 parameters, lets say @first_name and @column_name.
I am using a
SELECT * FROM members WHERE @column_name = @first_name
but when I run the procedure I get no results.
Is this valid? MS VS.net allows it and runs the procedure but I get no return?
if I alter the procedure to say
SELECT * FROM members WHERE first_name = @first_name
I get the desired results
Here is my stored preocedure
ALTER Procedure DBSearch (@first_name varchar(40), @column_name varchar(40))
as
select * from members where @column_name = @first_name;
RETURN
Thanks in advance for any help
BigJRags
|
|
|
|
|
Try this:
declare @sql varchar(500)
set @sql='SELECT * from members WHERE ' + @column_name + ' = ' + @first_name
exec(@sql)
<italic>Work hard, Work effectively.
|
|
|
|
|
That looks good to me but it's not working???
|
|
|
|
|
Why is it not working? Try
select @sql
and run the query manually.
<italic>Work hard, Work effectively.
|
|
|
|
|
I wish I knew, here is the Procedure and the Output, when I right click and select Run Stored Procedure, I use Jeremy as @param1 and first_name as @param2
I am stumped...Any clues?????????????????/
ALTER Procedure DBSearch (@param1 varchar(40), @param2 varchar(40))
as
declare @sql varchar(500)
set @sql='SELECT * from members WHERE ' + @param2 + ' = ' + @param1
exec (@sql)
RETURN
Running dbo."DBSearch" ( @param1 = Jeremy, @param2 = first_name ).
Invalid column name 'Jeremy'.
No rows affected.
(0 row(s) returned)
@RETURN_VALUE = 0
Finished running dbo."DBSearch".
|
|
|
|
|
Edberg was right, see below.
<italic>Work hard, Work effectively.
|
|
|
|
|
I think with that one you need to add apostrophe (') as the column expects character value.
Try replacing the set @sql with this:
set @sql='SELECT * from members WHERE ' + @column_name + ' = ''' + @first_name + ''''
|
|
|
|
|
That did the trick, thanks a million
|
|
|
|
|
You can't use a parameter for a field name...
Absolute faith corrupts as absolutely as absolute power
Eric Hoffer
The opposite of the religious fanatic is not the fanatical atheist but the gentle cynic who cares not whether there is a god or not.
Eric Hoffer
|
|
|
|
|
Hello all,
I am enhancing a DTS package developed by someone else. Main purpose of the DTS package is to import the data from the input excel sheets received from multiple customers.There are 7 data pump tasks to import from 7 customers' excel sheets. Each pump task is called in a loop in an ActiveX Script to be executed.
In ActiveX Script following logic is used to execute the pump task:
set stpraj = pkg.Steps("DTSStep_DTSDataPumpTask_2")
stpraj.ExecutionStatus = DTSStepExecStat_Waiting
I added a new data pump task to import the data from a new customer and I used the same logic as above:
set stpram = pkg.Steps("DTSStep_DTSDataPumpTask_8")
stpram.ExecutionStatus = DTSStepExecStat_Waiting
when I executed the package it gave execution errors. I replaced the code stpram.ExecutionStatus = DTSStepExecStat_Waiting
with
stpram.execute.
Now the package is executing properly and populating the data, but some of the things I did not understand are:
1. Why the package gave execution erroers when I used "stpram.ExecutionStatus = DTSStepExecStat_Waiting" ?
2. In the results after the execution of the package it showed the status for
"stpraj.ExecutionStatus = DTSStepExecStat_Waiting" as "COmplete" and for "stpram.execute" it showed "Running".
What is the difference between "stpraj.ExecutionStatus = DTSStepExecStat_Waiting" and "stpram.execute"? which one is preferable?.
Any information and suggestions on above doubts please!
Thanks in advance.
|
|
|
|
|
How do I bring up the ODBC Configuration dialog box and retrieve the paramters from VB . Net?
JRM
|
|
|
|
|
Hello Guys,
I am trying to connect to the remote SQL server on a machine named blrkec15710a. I want to do this using ODBC connection. But after writing my code i get the error
An unhandled exception of type 'System.TypeLoadException' occurred in System.Windows.Forms.dll
I am attaching my code below and making BOLD the line because of which the error creeps in. CODE IS AS FOLLOWS:-
_________________________________________________________________________
Imports Microsoft.data.odbc<br />
Imports System.Data<br />
Imports System.Data.SqlServerCe<br />
<br />
Public Class Form1<br />
Inherits System.Windows.Forms.Form<br />
Friend WithEvents txtDisplay As System.Windows.Forms.TextBox<br />
Friend WithEvents btnGET As System.Windows.Forms.Button<br />
Friend WithEvents MainMenu1 As System.Windows.Forms.MainMenu<br />
<br />
[+] #Region " Windows Form Designer generated code "<br />
<br />
<br />
Private Sub btnGET_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnGET.Click<br />
<br />
Try 'Driver={MsSQLSERVER};<br />
txtDisplay.Text = "Hello Zalak..."<br />
<br />
Dim strConnection As String = New String("DRIVER = {SQL Server};SERVER=blrkec15710A;UID=sa;PWD=SysAdmin;DATABASE=syncDS;")<br />
<br />
txtDisplay.Text = "after writing the connection string.."<br />
Dim SQL As String = New String("SELECT * FROM Orders")<br />
txtDisplay.Text = "after writing the SQL query"<br />
<br />
' Create connection object ---- PROBLEM IS HERE<br />
<br />
Dim conn As OdbcConnection = New OdbcConnection(strConnection) <br />
<br />
txtDisplay.Text = "create odbcConnection object.."<br />
<br />
Catch ex As Exception<br />
<br />
End Try<br />
<br />
End Sub<br />
End Class
_________________________________________________________________________
Now the error creeps in when i try to create an ODBCConnection object with the connection string as the parameter.
So most likely the error lies in the connection string.
My connection string:-
Dim strConnection As String = New String("DRIVER = {SQL Server};SERVER=blrkec15710A;UID=sa;PWD=SysAdmin;DATABASE=syncDS;")
here,
driver = SQL SERVER or should it be "'Microsoft SQL Server OBDC Driver Version 03.81.9042" that i see when i am trying to make the DSN and do TEST SOURCE that time i see this driver name in the summary.
server = blrkec15710a (my remote machine name where the SQL Server resides)
database = northwind or the name of the DSN made here "syncDS" which points to the Northwind database on server blrkec15710a
UID and PWD should they be in "" "" or as it is?
I need a solution to this immediately, whether the problem is with the connectionstring attributes or something else?
also where has the DSN to be made on the desktop where i am writing my application or the desktop where the SQL Server resides?
And when should the DRIVER attribute be blank, and if it blank then how does the connection string look like?
I will be really grateful to u people if i can get a response to this as soon as possible!!!
Thanks in advance,
Zalak dedhia
|
|
|
|
|
Create a DSN in the computer and use it as ODBC.
Al
|
|
|
|
|
I have the following problem when I output a select as XML. What happens, is that the query does not append line breaks to each record, so you are stuck with something that when you view in IE, it reports an error. This is because IE is just chopping the row to start it on the next line.
I will try explain it another way now. If there is a varchar(4000) buffer, what happens when the buffer is full, is that it adds that as a new row, then continues filling itself again. So what you end up with is records that get truncated by the viewing program (eg Internet Explorer)
|
|
|
|
|
hi
im using SqlDmo.dll to attach Database to MSDE and it gives me the following error msg
[microsoft][ODBC SQL Server Driver][SQL Server]The LSN(671:291:1)passed to log scan in database 'TelecontrollerPlus'is invalid
TelecontrollerPlus : is DB file name
and the code is
Dim SqlServ As New SQLDMO.SQLServer()
SqlServ.LoginSecure = True
SqlServ.Connect(SqlNAme)
OpenFileDialog1.ShowDialog()
Dim NAmes As String = OpenFileDialog1.FileName
If NAmes <> "" Then SqlServ.AttachDB("TelecontrollerPlus", "[" & NAmes & "]") : MsgBox("Attach DB is Done")
any one know aht is this error
thank u
|
|
|
|
|
from your database folder remove the .LDF (SQL server Database log file)
and then try to attach the database file to your server
At the end its all will be OK
|
|
|
|
|
HI all,
I have a table say table1 in which i have column1,column2,column3
I have a variable var1.
On the basis of value in var1 i wana fetch the data.
Like
if var1=1 then I wana select value from column1
if var1=2 then I wana select value from column2
can anyone please suggest the sqlserver2000 query for this.
thanks
|
|
|
|
|
General 
News 
Suggestion 
Question 
Bug 
Answer 
Joke 
Praise 
Rant 
Admin 
Submit an article or tip
