I have a user object that is stored in the session for each user but what if an administrator updates a certain user and I want to reflect the update to the user if they are logged in?
One possible way of solving this is:
Each time the user goes to a page, check the user table and compare the timestamp. That would mean if 30 users refresh the page..the db would hit 30 times lol. I don't think that would scale very well.
Any ideas on how to solve this?
Hi everybody,I need to understand how concurrency excatly
work in asp.net. For example, I'm confused what happens if two users at
the same time try to access the same record in a table or even the same
variable. Do ASP.NET handle this , I mean by locking one user and
letting the other to have access OR it's up to the programmer to write
some code to lock shared resources such as database , objects and
variables?If it's up to the programmer to do this task, I appreciate if you can show me an example that clarifies that.Thank you
Following on from a thread I started about "concurrency" (real-time-ishsystem), I thought I would play about to see if I could easily adapt my datamodel to take account of potential multi-user write conflicts. So, I wouldappreciate you checking my logic/reasoning to see if this kind of thingwill work. Below I have a stored procedure that will simply delete a givenrecord from a given table. I have appended a "_Written" counter to thecolumns of the table. Every time the record is written, the counter isincremented. Clients store the current _Written count in their objects andpass this in to any write procedure executed.The procedure explicitly checks the _Written count within the transaction tosee if it agress with the written count passed in by the client. If it doesnot, the client throws an error. Note I am explicitly checking the_Written count precisely so I can determine exactly why this operation mightfail, rather than checking @@ROWCOUNT after an update.Thanks.RobinCREATE PROCEDURE dbo.proc_DS_Remove_DataSet@_In_ID INTEGER,@_In_Written INTEGERASDECLARE @Error INTEGERDECLARE @WRITTEN INTEGERBEGIN TRANSACTIONSET @Error = @@ERRORIF @Error = 0BEGINSELECT @WRITTEN = _Written FROM MyTable WHERE ID = @_In_IDSET @Error = @@ERRORIF @WRITTEN <> @_In_WrittenBEGINRAISERROR ('10', 16, 1)SET @Error = @@ERRORENDENDIF @Error = 0BEGINDELETE FROM MyTable WHERE ID = @_In_IDSET @Error = @@ERRORENDIF @Error = 0COMMIT TRANSACTIONELSEROLLBACK TRANSACTIONRETURN @Error
View 5 Replies View RelatedDo single commands (or stored procedures) execute concurrently, or they are executed one by one. How do you perform a lock during the execution of a command (or stored procedure).
View 3 Replies View RelatedHi There,This is related to a ms access database but since I use the SqlDataSource control I thought I should post here.I have a project that I was working on with this ms access db and using sql controls, everything was working just finesince one day I started getting "Object reference not set to an instance of an object" messages when I try to designa query or retrieve a schema, nothing works at design time anymore but at runtime everything is perfect, its a lotof work for me now to create columns,schemas and everything manually, I've tried reinstalling visualstudio, ado componentsbut nothing seems to fix it, did this ever happen to any of you guys?any tip is really appreciated thanks a lot
View 2 Replies View RelatedDoes any one has any clue for this error ? I did went through a lot of articles on this error but none helped . I am working in Visual studie 2005 and trying to upload image in sql database through a simple form. Here is the code
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
using System.Web.Configuration;
using System.IO;
public partial class Binary_frmUpload : System.Web.UI.Page
{protected void Page_Load(object sender, EventArgs e)
{
}protected void btnUpload_Click(object sender, EventArgs e)
{if (FileUpload.HasFile == false)
{
// No file uploaded!lblUploadDetails.Text = "Please first select a file to upload...";
}
else
{string str1 = FileUpload.PostedFile.FileName;
string str2 = FileUpload.PostedFile.ContentType; string connectionString = WebConfigurationManager.ConnectionStrings["GSGA"].ConnectionString;
//Initialize SQL Server Connection SqlConnection con = new SqlConnection(connectionString);
//Set insert query string qry = "insert into Officers (Picture,PictureType ,PicttureTitle) values(@ImageData, @PictureType, @PictureTitle)";
//Initialize SqlCommand object for insert. SqlCommand cmd = new SqlCommand(qry, con);
//We are passing Original Image Path and Image byte data as sql parameters. cmd.Parameters.Add(new SqlParameter("@PictureTitle", str1));
cmd.Parameters.Add(new SqlParameter("@PictureType", str2));Stream imgStream = FileUpload.PostedFile.InputStream;
int imgLen = FileUpload.PostedFile.ContentLength;byte[] ImageBytes = new byte[imgLen]; cmd.Parameters.Add(new SqlParameter("@ImageData", ImageBytes));
//Open connection and execute insert query.
con.Open();
cmd.ExecuteNonQuery();
con.Close(); //Close form and return to list or images.
}
}
}
Object reference not set to an instance of an object.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.Source Error:
Line 32:
Line 33: string str2 = FileUpload.PostedFile.ContentType;
Line 34: string connectionString = WebConfigurationManager.ConnectionStrings["GSGA"].ConnectionString;
Line 35:
Line 36: //Initialize SQL Server Connection Source File: c:UsersManojDocumentsVisual Studio 2005WebSitesGSGABinaryfrmUpload.aspx.cs Line: 34
Stack Trace:
[NullReferenceException: Object reference not set to an instance of an object.]
Binary_frmUpload.btnUpload_Click(Object sender, EventArgs e) in c:UsersManojDocumentsVisual Studio 2005WebSitesGSGABinaryfrmUpload.aspx.cs:34
System.Web.UI.WebControls.Button.OnClick(EventArgs e) +105
System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +107
System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +7
System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +11
System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +33
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +5102
Hello All
Not sure if this is the right forum to post this question to, so if it's not, please accept my apologies.
I'm working in SQL Server 2005 with a database that was migrated to 2005 from SQL Server 2000. I have to alter a trigger on a table for some functionality changes, and when I modify the trigger and then access it through the application the database is working with, I receive this error:
There was a error in the [stored procedure name] procedure. Error Number: -2147217900 Error Description: [Microsoft][ODBC SQL Server Driver][SQL Server]The definition of object '[trigger name]' has changed since it was compiled.
[stored procedure name] and [trigger name] are where the actual names appear in the message.
I've tried running sp_recompile on the trigger, stored procedure, and table that are associated with this, and nothing works. I have dropped the trigger, which allows the save process to complete (but doesn't perform the required functionality, of course), and then re-created the trigger, but the error message still comes up. The compatibility level for the database is SQL Server 2000 (80) (as it was migrated from SQL Server 2000 as I mentioned above).
Has anyone seen this, and if so, how can I fix it?
Thanks in advance for your help!
Jay
Help! I have posted this before and I had hoped that the VS2005 SP1 would help my problem. It didn't. My code is shown below. I have dropped a sqlconnection, sqldataadapter and a strongly-typed dataset from the toolbox onto the component designer for my page and written my code. It compiles without any errors but at runtine I receive the system error "Object reference not set to an instance of an object." The error occurs at the first line where the sqldataadapter is mentioned. I have shufflled the code and the error still occurs at first mention of the dataadapter. I have set parameters to a simple string such as "myemail." It hasn't helped. I have used the "Dim" statement as "Dim DaAuthorLogin as System.Data.SqlClient.SqlDataadapter and Dim DaAuthorLogin as New ......) at the start of the private sub generated by the event requiring the data. Nothing helps. Here is my simple code to select data from a sqlserver 2000 database. Why do I continue to get this error?
Partial Class AuthorLogin
Inherits System.Web.UI.Page
Protected WithEvents AuthorInformation As System.Web.UI.Page
#Region " Web Form Designer Generated Code "
'This call is required by the Web Form Designer.
<System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
Me.SqlSelectCommand1 = New System.Data.SqlClient.SqlCommand
Me.DaAuthorLogin = New System.Data.SqlClient.SqlDataAdapter
Me.MDData = New System.Data.SqlClient.SqlConnection
Me.DsAuthorLogin = New MedicalDecisions.DsAuthorLogin
CType(Me.DsAuthorLogin, System.ComponentModel.ISupportInitialize).BeginInit()
'
'SqlSelectCommand1
'
Me.SqlSelectCommand1.CommandText = "SELECT AuthorAlias, AuthorEmail, AuthorPassword, LastName, PreferredName" & Global.Microsoft.VisualBasic.ChrW(13) & Global.Microsoft.VisualBasic.ChrW(10) & "FRO" & _
"M T_Author" & Global.Microsoft.VisualBasic.ChrW(13) & Global.Microsoft.VisualBasic.ChrW(10) & "WHERE (AuthorEmail = @AuthorEmail) AND (AuthorPassword =" & _
" @AuthorPassword)"
Me.SqlSelectCommand1.Connection = Me.MDData
Me.SqlSelectCommand1.Parameters.AddRange(New System.Data.SqlClient.SqlParameter() {New System.Data.SqlClient.SqlParameter("@AuthorEmail", System.Data.SqlDbType.NVarChar, 50, "AuthorEmail"), New System.Data.SqlClient.SqlParameter("@AuthorPassword", System.Data.SqlDbType.NVarChar, 50, "AuthorPassword")})
'
'DaAuthorLogin
'
Me.DaAuthorLogin.SelectCommand = Me.SqlSelectCommand1
Me.DaAuthorLogin.TableMappings.AddRange(New System.Data.Common.DataTableMapping() {New System.Data.Common.DataTableMapping("Table", "T_Author", New System.Data.Common.DataColumnMapping() {New System.Data.Common.DataColumnMapping("AuthorAlias", "AuthorAlias"), New System.Data.Common.DataColumnMapping("AuthorEmail", "AuthorEmail"), New System.Data.Common.DataColumnMapping("AuthorPassword", "AuthorPassword"), New System.Data.Common.DataColumnMapping("LastName", "LastName"), New System.Data.Common.DataColumnMapping("PreferredName", "PreferredName")})})
'
'MDData
'
Me.MDData.ConnectionString = "Data Source=CIS1022DAVID;Initial Catalog=CGData;Integrated Security=True;Pooling" & _
"=False"
Me.MDData.FireInfoMessageEventOnUserErrors = False
'
'DsAuthorLogin
'
Me.DsAuthorLogin.DataSetName = "DsAuthorLogin"
Me.DsAuthorLogin.SchemaSerializationMode = System.Data.SchemaSerializationMode.IncludeSchema
CType(Me.DsAuthorLogin, System.ComponentModel.ISupportInitialize).EndInit()
End Sub
Friend WithEvents SqlSelectCommand1 As System.Data.SqlClient.SqlCommand
Friend WithEvents MDData As System.Data.SqlClient.SqlConnection
Friend WithEvents DaAuthorLogin As System.Data.SqlClient.SqlDataAdapter
Friend WithEvents DsAuthorLogin As MedicalDecisions.DsAuthorLogin
'NOTE: The following placeholder declaration is required by the Web Form Designer.
'Do not delete or move it.
Private designerPlaceholderDeclaration As System.Object
Private Sub Page_Init(ByVal sender As System.Object, ByVal e As System.EventArgs)
'CODEGEN: This method call is required by the Web Form Designer
'Do not modify it using the code editor.
InitializeComponent()
End Sub
#End Region
Private Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs)
'no code here
End Sub
Private Sub AuthorLoginRegister_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles AuthorLoginRegister.Click
'for new author registration
Response.Redirect("AuthorInformation.aspx")
End Sub
Private Sub AuthorLoginBack_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles AuthorLoginBack.Click
'to navigate back
Response.Redirect("MainPaths.aspx")
End Sub
Protected Sub AuthorLoginPassword_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles AuthorLoginPassword.TextChanged
'pass the parameters to the dataadapter and return dataset
DaAuthorLogin.SelectCommand.Parameters("@AuthorEmail").Value = AuthorLoginEmail.Text
DaAuthorLogin.SelectCommand.Parameters("@AuthorPassword").Value = AuthorLoginPassword.Text
MDData.Open()
DaAuthorLogin.Fill(DsAuthorLogin, "T_Author")
MDData.Close()
'set session objects
If DsAuthorLogin.T_Author.Rows.Count > 0 Then
Session("AuthorAlias") = DsAuthorLogin.T_Author(0).AuthorAlias
Session("LastName") = DsAuthorLogin.T_Author(0).LastName
Session("PreferredName") = DsAuthorLogin.T_Author(0).PreferredName
Response.Redirect("AuthorPaths.aspx")
Else : AuthorLoginNotValid.Visible = True
AuthorLoginEmail.Text = ""
AuthorLoginPassword.Text = ""
End If
End Sub
End Class
Thanks in advance,
David
Anyone know what this error means and how to get rid of it?
Public Sub Main()
Dim myMessage As Net.Mail.MailMessage
Dim mySmtpClient As Net.Mail.SmtpClient
myMessage.To(20) = New Net.Mail.MailAddress(me@hotmail.com)
myMessage.From = New Net.Mail.MailAddress(someone@microsoft.com)
myMessage.Subject = "as;dlfjsdf"
myMessage.Priority = Net.Mail.MailPriority.High
mySmtpClient = New Net.Mail.SmtpClient("microsoft.com")
mySmtpClient.Send(myMessage)
Dts.TaskResult = Dts.Results.Success
End Sub
Thanks,
Hi,
I am trying to develop a custom algorithm. I have implemented and tested training methods, however I fail at prediction phase. When I try to run a prediction query against a model created with my algorithm I get:
Executing the query ...
Obtained object of type: Microsoft.AnalysisServices.AdomdClient.AdomdDataReader
COM error: COM error: DMPluginWrapper; Object reference not set to an instance of an object..
Execution complete
I know this is not very descriptive, but I have seen that algorith doesn't even executes my Predict(..) function (I can test this by logging to a text file)
So the problem is this, when I run prediction query DMPluginWrapper gives exception -I think- even before calling my custom method.
As I said it is not a very descriptive message but I hope I have hit a general issue.
Thanks...
I am trying to send some data back to our as/400 from SQL server. Before I do so I need to delete entries from the table. I have an odbc connection set up and have used it sucessfully in a datareader compoenent but but when I try to use it for a delete SQL task it give me the followign error. what am I doing wrong? I even tried hardcoding in the system name/library name.
Here is my delete sql script
DELETE FROM DSSCNTL Where Companycode = 10
TITLE: SQL Task
------------------------------
Object reference not set to an instance of an object.
------------------------------
BUTTONS:
OK
------------------------------
When I try and run Report Builder Reports i get this error message "Object reference not set to an instance of an object. "
I can run reports locally but not from Report manager
here is the stack trace info
Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.
Source Error:
An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.
Stack Trace:
[NullReferenceException: Object reference not set to an instance of an object.]
Microsoft.Reporting.WebForms.WebRequestHelper.GetExceptionForMoreInformationNode(XmlNode moreInfo, XmlNamespaceManager namespaces) +18
Microsoft.Reporting.WebForms.WebRequestHelper.ExceptionFromWebResponse(Exception e) +358
Microsoft.Reporting.WebForms.ServerReport.ServerUrlRequest(Boolean isAbortable, String url, Stream outputStream, String& mimeType, String& fileNameExtension) +482
Microsoft.Reporting.WebForms.ServerReport.InternalRender(Boolean isAbortable, String format, String deviceInfo, NameValueCollection urlAccessParameters, Stream reportStream, String& mimeType, String& fileNameExtension) +958
Microsoft.Reporting.WebForms.ServerReportControlSource.RenderReport(String format, String deviceInfo, NameValueCollection additionalParams, String& mimeType, String& fileExtension) +84
Microsoft.Reporting.WebForms.ExportOperation.PerformOperation(NameValueCollection urlQuery, HttpResponse response) +143
Microsoft.Reporting.WebForms.HttpHandler.ProcessRequest(HttpContext context) +75
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +154
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +64
Version Information: Microsoft .NET Framework Version:2.0.50727.42; ASP.NET Version:2.0.50727.210
Getting the following error-message:
OS: Windows Server 2008 R2 Standard
64bit
Office 2010
Power Pivot Tables are fed by Power Query queries.
Hi Everyone,
Please help me on this issue. I'm a new SSIS User.
I've installed Sql Server 2005 Developer Edition
When I create a new SSIS Project in Business Intelligence Development Studio,
I get the following message:
"Microsoft Visual Studio is unable to load this document: Object reference is not set to an instance of an object".
Error loading 'package.dtsx'bject reference is not set to an instance of an object
When I try to debug the package, I get the below message:
parameter Component(System.Design) is null.
I've uninstalled and installed SS 2005 several times, yet the problem persists.
Please help.
This is the package.dtsx
<?xml version="1.0"?><DTS:Executable xmlnsTS="www.microsoft.com/SqlServer/Dts" DTS:ExecutableType="MSDTS.Package.1"><DTSroperty DTS:Name="PackageFormatVersion">2</DTSroperty><DTSroperty DTS:Name="VersionComments"></DTSroperty><DTSroperty DTS:Name="CreatorName">USkothand1</DTSroperty><DTSroperty DTS:Name="CreatorComputerName">US6051KOTHAND1</DTSroperty><DTSroperty DTS:Name="CreationDate" DTSataType="7">4/8/2008 10:53:39 AM</DTSroperty><DTSroperty DTS:Name="PackageType">5</DTSroperty><DTSroperty DTS:Name="ProtectionLevel">1</DTSroperty><DTSroperty DTS:Name="MaxConcurrentExecutables">-1</DTSroperty><DTSroperty DTS:Name="PackagePriorityClass">0</DTSroperty><DTSroperty DTS:Name="VersionMajor">1</DTSroperty><DTSroperty DTS:Name="VersionMinor">0</DTSroperty><DTSroperty DTS:Name="VersionBuild">0</DTSroperty><DTSroperty DTS:Name="VersionGUID">{FBD98635-EDDE-4F58-9D53-356E8CB653FB}</DTSroperty><DTSroperty DTS:Name="EnableConfig">0</DTSroperty><DTSroperty DTS:Name="CheckpointFileName"></DTSroperty><DTSroperty DTS:Name="SaveCheckpoints">0</DTSroperty><DTSroperty DTS:Name="CheckpointUsage">0</DTSroperty><DTSroperty DTS:Name="SuppressConfigurationWarnings">0</DTSroperty><DTSroperty DTS:Name="ForceExecValue">0</DTSroperty><DTSroperty DTS:Name="ExecValue" DTSataType="3">0</DTSroperty><DTSroperty DTS:Name="ForceExecutionResult">-1</DTSroperty><DTSroperty DTS:Name="Disabled">0</DTSroperty><DTSroperty DTS:Name="FailPackageOnFailure">0</DTSroperty><DTSroperty DTS:Name="FailParentOnFailure">0</DTSroperty><DTSroperty DTS:Name="MaxErrorCount">1</DTSroperty><DTSroperty DTS:Name="ISOLevel">1048576</DTSroperty><DTSroperty DTS:Name="LocaleID">1033</DTSroperty><DTSroperty DTS:Name="TransactionOption">1</DTSroperty><DTSroperty DTS:Name="DelayValidation">0</DTSroperty>
<DTS:LoggingOptions><DTSroperty DTS:Name="LoggingMode">0</DTSroperty><DTSroperty DTS:Name="FilterKind">1</DTSroperty><DTSroperty DTS:Name="EventFilter" DTSataType="8"></DTSroperty></DTS:LoggingOptions><DTSroperty DTS:Name="ObjectName">Package</DTSroperty><DTSroperty DTS:Name="DTSID">{191D188C-EA6E-46D6-A46A-8C9F3C21C321}</DTSroperty><DTSroperty DTS:Name="Description"></DTSroperty><DTSroperty DTS:Name="CreationName">MSDTS.Package.1</DTSroperty><DTSroperty DTS:Name="DisableEventHandlers">0</DTSroperty></DTS:Executable>
Thanks
Best Regards
Hi All,
i have a table in MS Access with CandidateId and Image column. Image column is in OLE object format. i need to move this to SQL server 2005 with CandidateId column with integer and candidate Image column to Image datatype.
its very udgent, i need any tool to move this to SQL server 2005 or i need a code to move this table from MS Access to SQL server 2005 in C#.
please do the needfull ASAP. waiting for your reply
with regards
Just installed VS 2005 & SQLServer 2005 clients on my workstation. When trying to create a new Integration Services Project and start work in the designer receive the MICROSOFT VISUAL STUDIO 'Object reference not set to an instance of an object.' dialog box with message "Creating project 'Integration Services project1'...project creation failed."
Previously I had SQLServer 2000 client with the little VS tool that came with it installed. Uninstalled these prior to installing the 2005 tools (VS and SQLServer).
I'm not finding any information on corrective action for this error.
Any one have this problem and found the solution?
Thanks,
CLC
Each time I press submit to insert data into the database I receive the following message. I use the same code on another page and it works fine. Here is the error:
Object reference not set to an instance of an object.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.
Source Error:
Line 125: MyCommand.Parameters("@Balance").Value = txtBalance.Text
Line 126:
Line 127: MyCommand.Connection.Open()
Line 128:
Line 129: Try
Source File: c:inetpubwwwrootCreditRepairCreditor_Default.aspx.vb Line: 127
Stack Trace:
[NullReferenceException: Object reference not set to an instance of an object.]
CreditRepair.CreditRepair.Vb.Creditor_Default.btnSaveAdd_Click(Object sender, EventArgs e) in c:inetpubwwwrootCreditRepairCreditor_Default.aspx.vb:127
System.Web.UI.WebControls.Button.OnClick(EventArgs e)
System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument)
System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument)
System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData)
System.Web.UI.Page.ProcessRequestMain()
Private Sub btnSave_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnSave.Click
If (Page.IsValid) Then
Dim DS As DataSet
Dim MyCommand As SqlCommand
Dim AddAccount As String = "insert into AccountDetails (Account_ID, Report_ID, Balance) values (@Account_ID, @Report_ID, @Balance)"
MyCommand = New SqlCommand(AddAccount, MyConnection)
MyCommand.Parameters.Add(New SqlParameter("@Account_ID", SqlDbType.Char, 50))
MyCommand.Parameters("@Account_ID").Value = txtAccount_ID.Text
MyCommand.Parameters.Add(New SqlParameter("@Report_ID", SqlDbType.Char, 50))
MyCommand.Parameters("@Report_ID").Value = txtReport_ID.Text
MyCommand.Parameters.Add(New SqlParameter("@Balance", SqlDbType.Char, 50))
MyCommand.Parameters("@Balance").Value = txtBalance.Text
MyCommand.Connection.Open()
MyCommand.ExecuteNonQuery()
Response.Redirect("Customer_Details.aspx?SS='CustHeadGrid.Columns[0].Item.lblSS.Text)")
MyCommand.Connection.Close()
End If
I am trying to execute this code feom Script task while excuting its giving me error that "Object reference not set to an instance of an object." The assemblies Iam referening in this code are there in GAC. Any idea abt this.
Thanks,
Public Sub Main()
Dim remoteUri As String
Dim fireAgain As Boolean
Dim uriVarName As String
Dim fileVarName As String
Dim httpConnection As Microsoft.SqlServer.Dts.Runtime.HttpClientConnection
Dim emptyBytes(0) As Byte
Dim SessionID As String
Dim CusAuth As CustomAuth
Try
' Determine the correct variables to read for URI and filename
uriVarName = "vsReportUri"
fileVarName = "vsReportDownloadFilename"
' create SessionID for use with HD Custom authentication
CusAuth = New CustomAuth(ASCIIEncoding.ASCII.GetBytes(Dts.Variables("in_vsBatchKey").Value.ToString()))
Dts.Variables(uriVarName).Value = Dts.Variables(uriVarName).Value.ToString() + "&" + _
"BeginDate=" + Dts.Variables("in_vsBeginDate").Value.ToString() + "&" + _
"EndDate=" + Dts.Variables("in_vsEndDate").Value.ToString()
Dim request As HttpWebRequest = CType(WebRequest.Create(Dts.Variables(uriVarName).Value.ToString()), HttpWebRequest)
'Set credentials based on the credentials found in the variables
request.Credentials = New NetworkCredential(Dts.Variables("in_vsReportUsername").Value.ToString(), _
Dts.Variables("in_vsReportPassword").Value.ToString(), _
Dts.Variables("in_vsReportDomain").Value.ToString())
'Place the custom authentication session ID in a cookie called BatchSession
request.CookieContainer.Add(New Cookie("BatchSession", CusAuth.GenerateSession("EmailAlertingSSIS"), "/", Dts.Variables("in_vsReportDomain").Value.ToString()))
' Set some reasonable limits on resources used by this request
request.MaximumAutomaticRedirections = 4
request.MaximumResponseHeadersLength = 4
' Prepare to download, write messages indicating download start
Dts.Events.FireInformation(0, String.Empty, String.Format("Downloading '{0}' from '{1}'", _
Dts.Variables(fileVarName).Value.ToString(), Dts.Variables(uriVarName).Value.ToString()), String.Empty, 0, fireAgain)
Dts.Log(String.Format("Downloading '{0}' from '{1}'", Dts.Variables(fileVarName).Value.ToString(), Dts.Variables(uriVarName).Value.ToString()), 0, emptyBytes)
' Download data
Dim response As HttpWebResponse = CType(request.GetResponse(), HttpWebResponse)
' Get the stream associated with the response.
Dim receiveStream As Stream = response.GetResponseStream()
' Pipes the stream to a higher level stream reader with the required encoding format.
Dim readStream As New StreamReader(receiveStream, Encoding.UTF8)
Dim fileStream As New StreamWriter(Dts.Variables(fileVarName).Value.ToString())
fileStream.Write(readStream.ReadToEnd())
fileStream.Flush()
fileStream.Close()
readStream.Close()
fileStream.Dispose()
readStream.Dispose()
'Download the file and report success
Dts.TaskResult = Dts.Results.Success
Catch ex As Exception
' post the error message we got back.
Dts.Events.FireError(0, String.Empty, ex.Message, String.Empty, 0)
Dts.TaskResult = Dts.Results.Failure
End Try
End Sub
Hi all,
I'm getting this problem 'Object reference not set to an instance of an object.' whenever I try to review a report and I checked the log file and this is what it had
w3wp!ui!1!11/14/2006-10:54:20:: Unhandled exception: System.NullReferenceException: Object reference not set to an instance of an object.
at Microsoft.Reporting.WebForms.WebRequestHelper.GetExceptionForMoreInformationNode(XmlNode moreInfo, XmlNamespaceManager namespaces)
at Microsoft.Reporting.WebForms.WebRequestHelper.ExceptionFromWebResponse(Exception e)
at Microsoft.Reporting.WebForms.ServerReport.ServerUrlRequest(Boolean isAbortable, String url, Stream outputStream, String& mimeType, String& fileNameExtension)
at Microsoft.Reporting.WebForms.ServerReport.GetStyleSheet(String styleSheetName)
at Microsoft.Reporting.WebForms.ReportServerStyleSheetOperation.PerformOperation(NameValueCollection urlQuery, HttpResponse response)
at Microsoft.Reporting.WebForms.HttpHandler.ProcessRequest(HttpContext context)
at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)
Some previous forums stated checking the webconfig file but the web config file look okay. Is there another way to fix this.
Much Thanks,
Carl
Hello -
For the life of me I cannot figure out why i'm getting the "Object Refence Not Set To an Instance of An Object" error after I try and create a Report Services project in Business Intelligence Studio. I've followed all of the steps in similar posts such as checking the ReportServer/web.config file but everything checks out.
Does anyone have any other ideas as to how I can get rid of this annoying error and start creating some reports?
Thanks!!!
Hello,
I've ran into trouble while creating a rather simple transformation script component (one input, one output). The only thing it has to do is test the values coming from it's input rows and set the values of the output rows according to some rules; something like:
Code Block
Public Overrides Sub InputBrowser_ProcessInputRow(ByVal Row As InputBrowserBuffer)
If Row.UserAgent.Contains("MSIE") Then 'test input
Row.BrowserName = "Internet Explorer" 'set output
End If
End Sub
This raises an "Object reference not set to an instance of an object." exception. Commenting out the input (Row.UserAgent) solves the exception, but I actually do need to test the contents of the input row (and by leaving only the output manipulation, the script won't reach it's end, the components remain yellow). What can I do about this?
Thanks in advance!
I have a table where I count how many emails of a given type are sent out each day. This incrementing is wrapped in a sproc that either inserts a new row, or updates the existing row. The column that counts the value is named Count of type INT.
Below is the sproc, seems like a straightforward thing. However, I'm seeing email counts higher than they should be when there's a high number of concurrent executions of the sproc. I'm pretty sure it's not a problem in the calling code, so I'm wondering about the UPDATE statement, since it updates a column based on the value of the column. I would think this should work since it's wrapped in a SERIALIZABLE transaction, anybody have further insight?
SQL Server 2005 by the way.
Sean
CREATE PROCEDURE [dbo].[IncrementEmailCounter]( @siteId SMALLINT, @messageType VARCHAR(20), @day SMALLDATETIME) ASBEGIN SET NOCOUNT ON;
SET TRANSACTION ISOLATION LEVEL SERIALIZABLE BEGIN TRANSACTION
IF (SELECT COUNT(*) FROM EmailCount WHERE SiteId = @siteId AND MessageType = @messageType AND [Day] = @day) = 0 INSERT INTO EmailCount (SiteId, MessageType, [Day], [Count]) VALUES (@siteId, @messageType, @day, 1) ELSE UPDATE EmailCount SET [Count] = [Count] + 1 WHERE SiteId = @siteId AND MessageType = @messageType AND [Day] = @day
COMMIT TRANSACTION SET TRANSACTION ISOLATION LEVEL READ COMMITTEDEND
I'm wondering whether the following code would work if users are RAPIDLY registering (assumption) WITH the same username.public bool UsernamExists(string username)
{
string sql = "SELECT true FROM [users] WEHRE username = @username;";
return Convert.ToBoolean(comm.ExecuteScalar());
}
public bool Signup(User user)
{
bool usernameExists = UsernameExists(user.Username);
if( usernameExists ) return false;
//update or insert sql for user etc blah blah
} If two users try to signup AT THE VERY SAME TIME (DOWN TO THE NANOSECOND), would this technique work? Do I have to wrap it in a transaction, stored procedure?? Thanks.
Hi,I'm trying to implement Optimistic Concurrency in asp 2 but so far it has caused me nothing but problems.First, when doing an UPDATE I tried to use the primary key & a timestamp field which I had in SQL Express.. VS 2005 generated the stored procedures fine however when it came to the actual updating I think there was a problem with the conversion of the timestamp field when it was being stored in a text box (in a FormView control). So.. as a result that failed. And also I checked sooo many places online and haven't been able to find any examples of code where a timestamp was used with success in asp2.Next, I got ride of the timestamp type (in SQL Express database) and used a datetime and then.. I just implemented Optimistic Concurrency by passing in ALL the values (ie all the original values) like is proposed http://www.asp.net/learn/dataaccess/tutorial21vb.aspx?tabid=63 . This... works however I really do not want to have to pass in ALL these values (ie original and new).Ideally I would like to be able to use the primary key & the datetime field to handle the Optimistic Concurrency checks where only the original values of both those fields are passed back into the stored procedure. Now.. I tried this as well, but I kept getting an error that suggests that (for some reason) the FormView or DataSource is passing ALL the values (original & new) into the dataset as opposed to only the original primary key & datetime fields & the new set of values.Can ANYONE offer any help? I really would like not to have to pass in all these values.Thanks in advance!
View 6 Replies View RelatedHi! I'm building a web application with ASP.NET, and using MS SQL 2000 for my database server.
How should I do to guarantee the integrity of the data in spite of the concurrent access? Meaning... how can I make sure that more than 1 user can update 1 table at the same time, while no error will occur? Do I need to add some codes at my aspx file? Or do I need to do something to my database? Or do I not have to worry about it?
Thank you.
Can anyone help with concurrency issues. Small network and only one person at a time can log into the database.
It was originally written in MS Access and converted to SQL 7.0 with a VB front end.
Thanks,
Rick
We have two processors on which sql server was installed.
SMP Concurrency opion is -1. and process priority is 0.
The computer is dedicated to Sql server.
with the same setup, has any body faces any problem....?
some times suddenly system hangs... sql sever takes 99% cpu usage ...
Shall I run the SQL Executive, SQL Performance Monitor with this setup...?
will it afect the system...?
[ this kind of setup - those you experienced.. ]
please reply immediately....
thanks
Wincy
Hello,
SQL Server6.5 is installed on a dual processor computer. So can I make use of dual processors by setting SMP concurrency to -1 or 2.
I tried setting these values but failed to do so. Server is running at setting 1 always, irrespective of configured value.
Any suggestion???
Srini
Is there any way to get the sample below working so that both "threads" are guaranteed to get unique and incrementing values?
I'm suspecting the answer is no. You can use transactions on completely database oriented operations that read/write to a database and complete. But there aren't complete synchronization controls for operations like below that try to return a value to an outside process.
IF OBJECT_ID('SimpleTable') IS NOT NULL
DROP TABLE SimpleTable
CREATE TABLE SimpleTable (
A INTEGER
)
INSERT INTO SimpleTable (A) VALUES (1)
-- Run in one window
DECLARE @value INTEGER
BEGIN TRANSACTION
SELECT TOP 1 @value = A FROM SimpleTable
WAITFOR DELAY '00:00:05'
UPDATE SimpleTable SET A = @value + 1
COMMIT TRANSACTION
SELECT @value
SELECT A FROM SimpleTable
-- Run in a second window
DECLARE @value INTEGER
BEGIN TRANSACTION
SELECT TOP 1 @value = A FROM SimpleTable
UPDATE SimpleTable SET A = @value + 1
COMMIT TRANSACTION
SELECT @value
SELECT A FROM SimpleTable
Suppose process A is updating record #1 in table T.
By default, can other processes read record #1 while the updating is in progress ??
If the answer is Yes, then which value can they see - the old one or the new one ?
Thank you in advance.
Did I understand correctly the Pesimistic access:
When we choose pessimistic access
-we lock all the rows of the table. right.
-other users still can access the table if they specify read only mode meaning if their intention is to only read the data and not modify it. am I right
Thanks for your help.
In a previous post, the theme of cursors and concurrency was touched as a secondary subject. I have a specific question about it as the primary one:
if we have
--------
create proc myProc
as
declare cursor for
select * from mytable
go
----------
if two or more clients(webpages for example)
execute myProc concurrently will the cursor be safe ? or would I have to make special arrangements, there are a couple of procs (that use cursors)that somebody else did and would not like to modify but we want to make the procs web available,
thank you
hi gurusthe scenarioFrontend - MS Access (not yet decided whether MDB or ADP)Backend - MS SQL Serverit is a conversion from MS Access backend to MS SQL Server Backend.Planning to create stored procedures for all the Inserts, Updates,Deletes and Business Rules / Validations wherever it is possible.the problemi am running in concurrency problem. the same classic scenario of twousers retrieving the same row (record) from the same table. it allowsboth the user to update the record, that is, the user who updates lasthas his changes saved though he retrieved that particular recordsecond.what i need is that the user who retrieved the record second shouldn'tbe able to update or delete the record when it is already retrieved byany other user.would appreciate if someone pointed me in the right direction to solvethe above problem, i know it is related to isolation property but amnot surethanx in advanceregardsbala
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