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I am just started with c# and do it as a hoby. So I have no idea what a full stack trace is.
Thanks
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Okay, I didn't notice that it was an unhandled exception. The first thing you need to do is wrap that section of code in a try-catch block so you can catch the exception! When an exception is "unhandled", that means that it's bubbled up to the top, causing your program to crash. You will do something like this:
try {
throw new ApplicationException("I'm a little teapot");
} catch (Exception e) {
Console.WriteLine(e.StackTrace);
}
You should read up on exception handling right away-- you're already past the "Hello, world!" stage, and into database applications, where you really need to be able to clean up your resources in case of a problem. Good luck.
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this is what I get
at System.Data.OleDb.OleDbConnection.ProcessResults(Int32 hr)
at System.Data.OleDb.OleDbConnection.InitializeProvider()
at System.Data.OleDb.OleDbConnection.Open()
at System.Data.Common.DbDataAdapter.QuietOpen(IDbConnection connection, ConnectionState& originalState)
at System.Data.Common.DbDataAdapter.Fill(Object data, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior)
at System.Data.Common.DbDataAdapter.Fill(DataSet dataSet, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior)
at System.Data.Common.DbDataAdapter.Fill(DataSet dataSet, String srcTable)
at WindowsApplication5.Form1..ctor() in c:\documents and settings\roman\my documents\visual studio projects\windowsapplication5\form1.cs:line 77
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Try creating an ODBC data source, and then use the data source name in your connection string.
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Hi, EveryBody,
I want to display pictures stored in a database. First I use the following code(VB6) to save the picture to the database:
Dim cnn As ADODB.Connection
Dim rst As ADODB.Recordset
Dim stream As New ADODB.stream
Set cnn = New Connection
cnn.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=H:\test.mdb;"
cnn.CursorLocation = adUseClient
cnn.Open
Set rst = New Recordset
rst.ActiveConnection = cnn
rst.Open "t1", cnn, adOpenKeyset, adLockOptimistic
rst.AddNew
rst!p_name = "dd"
stream.Type = adTypeBinary
stream.Open
stream.LoadFromFile "H:\pp.jpg"
rst!pic = stream.Read
Set stream = Nothing
rst.Update
cnn.Close
------------------------------
and then I use the following code(ASP) to display the image:
<%
Dim cnn
Dim rs
' Clear existing HTTP header info
Response.Expires = 0
Response.Buffer = TRUE
Response.Clear
' Set the HTTP header to an image type.
Response.ContentType = "image/JPEG"
cnnPubs=getdbconn() ' the function return the db connection
set rs=server.CreateObject("adodb.recordset")
rs.Open "SELECT FROM t1where id=1",cnn
Response.BinaryWrite rst("pic")
Response.End
%>
and I use to show the image.
the first(vb) code works well.
but I alway can not display the image, I just got a image like red X.
please help me to solve the problem.
Thanks a lot!!!
Best!
Alan
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MS Access stores an OLE header before the image data.
remove that header before sending the Response.
the size of the header is about 19 bytes (as i reacall)
search MSDN , KB for info about this:
Retrieving Bitmap from Access and Displaying In Web Page.
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I'm trying to build a cross-tab query that is dynamic in mssql 2000. Since it does use the transform syntax I am stuck at doh
The columnheader will always change. So it's more of a dynamic columnheader. Depending on the Day of the week. There could be 5 or 3 or 10 teacher who have classes to teacher at different time of the day.
The Teacher's names will be the columnheader
Teaher's names across the top
The time is in the left column down
and student name
____ Teacher_Name Teacher_Name Teacher_Name Teacher_Name
Time Student_Name Student_Name Student_Name Student_Name
Time Student_Name Student_Name Student_Name Student_Name
Time Student_Name Student_Name Student_Name Student_Name
C2 and R2 = Student_Name
C3 and R2 = Student_Name
C2 and R3 = Student_Name
C1 and R3 = Student_Name and so on
The only way i can build a cross-tab query is in crystal report.
Any help would be gladly appreciated
I want to display the data in a listview or datagrid.
I'm lossing hair here and i have a bit left.
I'll look like homer in now time with 3 strings of hair. 
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I initially created a cursor to create the a SQL statements as follows. Example:
SELECT tp.PropertyTestID, tp.PropertyTestGroupID, tp.PropertyTestName,
SUM(CASE WHEN S.SampleID = 122 THEN ResultDecimal ELSE NULL END) AS [N/A122 05/02/2004],
SUM(CASE WHEN S.SampleID = 109 THEN ResultDecimal ELSE NULL END) AS [N/A109 03/31/2004],
SUM(CASE WHEN S.SampleID = 108 THEN ResultDecimal ELSE NULL END) AS [N/A108 03/30/2004],
SUM(CASE WHEN S.SampleID = 107 THEN ResultDecimal ELSE NULL END) AS [N/A107 03/17/2004],
SUM(CASE WHEN S.SampleID = 106 THEN ResultDecimal ELSE NULL END) AS [N/A106 03/01/2004],
SUM(CASE WHEN S.SampleID = 105 THEN ResultDecimal ELSE NULL END) AS [N/A105 01/05/2004],
SUM(CASE WHEN S.SampleID = 104 THEN ResultDecimal ELSE NULL END) AS [N/A104 11/17/2003]
FROM tblSamplesPropertyTest tp,
tblSamplesSample s,
tblSamplesSampleResult sr,
tblSamplesCustomerProductReportPropertyTest prpt,
tblSamplesProductPropertyTest ppt
WHERE tp.PropertyTestID = ppt.PropertyTestID
AND ppt.PropertyTestID = prpt.PropertyTestID
AND sr.CustomerProductReportPropertyTestID = prpt.CustomerProductReportPropertyTestID
AND s.SampleID =* sr.SampleID
AND s.SampleID in (122,109,108,107,106,105,104)
AND tp.ResultTypeID = 1
AND (tp.Deleted = 0 or tp.Deleted Is Null)
GROUP BY tp.PropertyTestID, tp.PropertyTestGroupID, tp.PropertyTestNameAfter creating the statement I executed exec(@SQL) in the procedure.
However, I found this site that was quite helpful. Once I figured out what the crosstab stored procedure was doing in the article. Now any new crosstab/pivot tables are created using this method.
http://www.sqlteam.com/item.asp?itemID=2955
The easiest route, but not the best, may be to create an ODBC link to SQL server. Create an access database that links the necessary tables for the reports. Then simply create the reports in Access.
Good Luck,
Michael
I firmly believe that any man's finest hour, the greatest fulfillment of all that he holds dear, is that moment when he has worked his heart out in a good cause and lies exhausted on the field of battle - victorious.
Vince Lombardi (1913-1970)
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Thanks I'll give it a try and see how it goes.
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We have a UDF (defined below that we are rtying to call from a column in the databse table. We are using the formua field in SQL enterprise manager to enter the call to the UDF.
Both columns are defined as datetime as well as the column we are trying to get the UDF to work in.
I have tried to use the following:
database.dbo.RuntimeSort(database.dbo.table.columnname, database.dbo.table.columnname)
RuntimeSort(columnname,columnname)
database.dbo.RuntimeSort(columnname, columnname)
RuntimeSort(database.dbo.table.columnname, database.dbo.table.columnname)
UDF:
CREATE FUNCTION dbo.RuntimeSort (@DateProduction datetime, @TimeStart datetime)
RETURNS datetime
BEGIN
DECLARE @Date datetime
DECLARE @DateReturn datetime
SET @Date = dateadd(day, 1, @DateProduction)
SET @DateReturn = datepart(mm, @Date) + '/' + datepart(dd, @Date) + '/' + datepart(yyyy, @Date) + ' ' + datepart(hour, @TimeStart) + ':' + datepart(minute, @TimeStart) + ':' + datepart(second, @TimeStart)
RETURN @DateReturn
END
I am at a loss here  and any help would be appreciated.
Regards
Eric C. Tomlinson
No comment, Mr. Senator<pre>
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If that function is a direct cut-and-paste from Enterprise manager, there's a bug in it:
"Server: Msg 245, Level 16, State 1, Procedure RuntimeSort, Line 10
Syntax error converting the varchar value '/' to a column of data type int."
**Edit**
I see the problem. You have DATEPART() + '/'
DATEPART returns an int, which you are NOT casting to a varchar. So, when you try to add '/' to an int, it tries to auto-cast the slash into an int, and the function bombs.
To answer your original question, however, the proper method of defining the formula is dbo.RuntimeSort(date1, date2). You MUST provide the object owner, as well as the object name, and ALL parameters. UDF's on SQL Server 2000 don't support default parameter values like stored procs do.
Grim (aka Toby) MCDBA, MCSD, MCP+SB
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In this question I have Form1, myDataAccess class, Customer class.
In Form1 I have ListBox1 and a ButtonFill. Can you show me how do I get the details of customer(Firstname and Lastname) to fill in the ListBox1 by click on the ButtonFill. The 2 classes are coded below. The code in Customer class has some error. I am appreciate if you give me an example code. Thanks
'--------myDataAccess class---------------
Imports System.Data.SqlClient
Public Class myDataAccess
Public Function GetDataSet() As DataSet
Dim connection As SqlConnection
Dim command As New SqlCommand
If command.Connection Is Nothing Then
connection = New SqlConnection("workstation id=WHITE;packet size=4096;integrated security=SSPI;data source=WHITE;persist security info=False;initial catalog=ABC")
connection.Open()
command.Connection = connection
End If
Dim dataset As New DataSet
Dim adapter As New SqlDataAdapter(command)
adapter.Fill(dataset)
adapter.Dispose()
If Not connection Is Nothing Then
connection.Close()
End If
Return dataset
End Function
End Class
-----------------------------------
Imports System.Data.SqlClient
Public Class CustomerClass
Inherits myDataAccess
Public Function GetCustomerByname(ByVal Firstname As String, ByVal Lastname As String) As DataSet
Dim myQuery As String = "select * from CustomerTable"
GetDataSet()
Dim dataset As New DataSet
Dim adapter As New SqlDataAdapter
adapter.SelectCommand = New SqlCommand(myQuery)
adapter.Fill(dataset, "CustomerTable")
Return dataset
End Function
End Class
-----------------------------------
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Hi,
i m getting problem in a query ,
==> Order_Recieved_Detail
ordID | ordQuantity | ordCost | productID | orID
=================================================
1_____|___10________|_2500____|____1______|___1
2_____|___10________|_3000____|____2______|___1
3_____|__ 10 _______|_3000____|____3______|___1
4_____|___10 _______|_2500____|____1______|___2
5_____|___10 _______|_3000____|____2______|___2
now i m getting problem in calculation of getting sum of ordQuantity of productID 1 of orID 1 and 2 to get 20
i want to get the following result
ordQuantity | productID
==========================
___20_______|____1______
___20_______|____2______
__ 10 ______|____3______
the query which i am using just sum all the itmes in the orderquantity column and not giving the sum of productID 1 and 2
waiting for any one to help me out....
"Winner's don't do different things , they do things differently "
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Try this:
SELECT SUM(ordQuantity) AS ordQuantity, productID
FROM Order_Received_Detail --(is your table name Order_Recieved_Detail or Order_Received_Detail?)
GROUP BY productID
if you need them to be only for orID 1 and 2 then put the following line before the GROUP BY
WHERE orID IN (1,2)
Hope it helps!
Edbert P.
Sydney, Australia.
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Hi Ebbert:
it works .... thanks..
its really nice to have people like you how always help out people like me which are new comers in this computer field ....
thanks again Edbert P.
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right now i am getting data thru SQLDataReader,and binding it to a data grid.Here i am hve 2 problems
1> how do i change the name of the headers of columns
2> how do i add a check box column. And then get the id from the checked column(s)
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1. Right click on the grid and choose Property Builder from the menu then choose columns.
2. Again from the Property Builder dialog choose columns. Then create a template column for the checkbox column. Close out the dialog and right click on the grid select edit template.
Also, stay away from the dataReader if possible. Try DataAdapter.Fill(DataSet) instead.
Michael
I firmly believe that any man's finest hour, the greatest fulfillment of all that he holds dear, is that moment when he has worked his heart out in a good cause and lies exhausted on the field of battle - victorious.
Vince Lombardi (1913-1970)
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thank you for the reply but the problem is:
well right now i am retriving data from several tables of the data base and with several rows of results so have to use sqlDataReader
thi have made a template column but from where to set it as a check box and how to access the particular row to get the info of the whole row (like registration ID's of the checked columns)
Zainab
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The DataAdapter.Fill(DataSet) will fill multiple resultset back to the client without holding a connection. When using a datareader, the connection cannot be pooled or used by any other user until the datareader.close() method is executed.
You can set the value in grid's ItemDataBound event or you the DataBinder.Eval in the html.
e.g.
value='<%# DataBinder.Eval(Container, "DataItem.CheckBoxColumn") %>'
Michael
I firmly believe that any man's finest hour, the greatest fulfillment of all that he holds dear, is that moment when he has worked his heart out in a good cause and lies exhausted on the field of battle - victorious.
Vince Lombardi (1913-1970)
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Hello,
My application is required to monitor a database in MS SQL. Can I use C#/ADO.NET to develop the application that is to detect a new record entered or updated in MS SQL?
I appreciate your helps.
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Vu Truong wrote:
My application is required to monitor a database in MS SQL. Can I use C#/ADO.NET to develop the application that is to detect a new record entered or updated in MS SQL?
Off the top of my head (I've never tried this, so YMMV), you could add a trigger to the database which on the relevant changes which calls into an extended stored procedure (or, if all you're doing is say, logging changes to a table back into another table for audit purposes, just use the trigger itself to update the log table)
An extended stored procedure is an exported function from a DLL (C-style), so you'll probably need to expose your C# code in a manner that SQL Server can understand, or write a C++ wrapper that can interop with your code.
Ian Darling
"If we've learned anything from history, it's that those who feed trolls are condemned to repetitive conversations. Or something like that." - Eric Lippert
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Ian Darling wrote:
Off the top of my head (I've never tried this, so YMMV), you could add a trigger to the database which on the relevant changes which calls into an extended stored procedure
I recently did just that.
I wrote several XP's to send messages to a specified server and port.
Of course there is an issue of protocol for the message format.
In general to write an XP you need the following :
1. Make sure you use the right srv header :
i.e. place
C:\PROGRAM FILES\MICROSOFT SQL SERVER\80\TOOLS\DEVTOOLS\INCLUDE
before
C:\Program Files\Microsoft Visual Studio\VC98\INCLUDE
in the list of include directories.
#include <srv.h>
2. Make sure you link with the OpenDS library :
#pragma comment(lib, "opends60") // MSSQL srv_*() functions
3. Make sure all your XP's are compiled as C not C++.
i.e. wrap with
#ifdef __cplusplus
extern "C" {
#endif
...
#ifdef __cplusplus
}
#endif if functions are in a cpp file.
4. Provide a __GetXpVersion() function in your library :
__declspec(dllexport) ULONG __GetXpVersion( void )
{
return(ODS_VERSION);
}
I ended up writing two sets of functions :
CMKMSSQL_API SRVRETCODE xp_cmkInitSvcMsg ( SRV_PROC *SP );
CMKMSSQL_API SRVRETCODE xp_cmkTermSvcMsg ( SRV_PROC *SP );
CMKMSSQL_API SRVRETCODE xp_cmkSendSvcMsg ( SRV_PROC *SP );
CMKMSSQL_API SRVRETCODE xp_cmkBroadcastSvcMsg ( SRV_PROC *SP );
and
CMKMSSQL_API SRVRETCODE xp_cmkInitGisMsg ( SRV_PROC *SP );
CMKMSSQL_API SRVRETCODE xp_cmkTermGisMsg ( SRV_PROC *SP );
CMKMSSQL_API SRVRETCODE xp_cmkSendGisMsg ( SRV_PROC *SP );
CMKMSSQL_API SRVRETCODE xp_cmkBroadcastGisMsg ( SRV_PROC *SP );
The *SvcMsg ones just send raw data to the specified server:port.
The *GisMsg ones send protocol formated messages to one of my GIS servers.
xp_cmkInit*Msg is called to create a connection to a specified server:port
Usage : EXEC xp_cmkInitSvcMsg <@server> <@port> [@handle OUTPUT]
The output handle is a long and is used to by the Term/Send functions.
xp_cmkTerm*Msg is called to close a connection.
Usage : EXEC xp_cmkTermSvcMsg <@handle>
xp_cmkSend*Msg sends a blob of data using the connection associated with the specified handle.
Usage : EXEC xp_cmkSendSvcMsg <@handle> <@msg>
Because the message is sent using
sock->Send( (byte*)srv_paramdata(SP, 2), srv_paramlen(SP, 2) );
The message can be any data type.
xp_cmkBroadcast*Msg sends a message to all connections.
Usage : EXEC xp_cmkBroadcastSvcMsg <@msg>
This is the one i call in the triggers.
...cmk
Save the whales - collect the whole set
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what is wrong with this code.
string commandString = "SELECT * FROM Company WHERE (Country = 'Brazil')";
System.Data.OleDb.OleDbDataAdapter DataAdpter9 = new System.Data.OleDb.OleDbDataAdapter(commandString, oleDbConnection1);
DataAdpter9.Fill(dataSet4);
dataGrid1.DataSource = dataSet4.Tables["Company"].DefaultView;
It gives me this error using try/catch:
"Object reference not set to an instance of an object"
DataSet and mispelled DataAdapter are all declared in the form_load.
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You probably forgot to declare the dataset4 as new dataset before trying to fill it.
Edbert P.
Sydney, Australia.
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