Use Partials And Stored Procs On The Same Data Context?
Oct 25, 2011
I'm working with system using Linq-2-SQL as its data layer, but which uses stored procedures to do the actual CRUD operations - the stored procs are configured against the CRUD methods for the data class in the model designer.These are all working just fine.Now we want to use partial classes to extend the functionality of our data classes to apply validation, and hold parsed versions of some of the database properties.
However when I create a partial class for one of the data classes, the datacontext stops using the methods configured against the dataclass and defaults to its own operations. This happens even if the partial is empty other than the just the class declaration.
I would guess that this might be because the method signature for the insert method stops tying up to what the datacontext is looking for, but I can't see any overrides available to help fix it.Is there a way around this so that I can use Partials and Stored Procs on the same data context?
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Jan 26, 2010
I have used CLR stores procedures in SQL server for awhile now, but I'm still wondering what the best situations to use them are.MSDN provides some guidelines for use like heavy string manipulation (regex), or replacing T-SQL that declares lots of table variables and cursors.I'm curious to know what problems SO users are solving with CLR stored procs, and examples / benchmarks as well.
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Apr 17, 2011
I am developing an ASPX web page to return results from two SQL stored procs via VB. When I execute these two stored procs, they both return valid data. But for some reason, when I run this report it doesn't return any errors, however, it doesn't return any records/data either!
Also, I can't debug it for some reason, although I can set breakpoints! This is using VS 2008, but I think reason I can't debug is I believe this is a limited version that just works for SSRS and SSIS.
[Code]...
Could the problem be due to the fact that this web page uses the same SQL connection for both stored procs? The first proc should be returned initially, and the second proc after this screen. So I don't need both stored procs information simultaneously, so I would think I could reuse the same SQL connection.
OK, I found where the problem is located. If I just comment out the Level statement in the Where clause, it does return data. So only thing I changed was that one line in my SQL code and it works. This means missing data must be due to datatype incompatibility, no? What is the problem?
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Jan 22, 2009
Trying to start a discussion on what approaches forum members take when faced with the issue of writing code that calls SQL queries upon a DB. Do you tend to always put SQL in stored procedures and call the proc (and does that include basic CRUD operations) or always the opposite? Or do you prefer a mix of some procs and some coded sql? If its the latter then how do you determine which queries go where?I imagine the scale of a project can dictate some of the possible answers. I've done both and sometimes I find that quick and dirty apps that have little chance of changing or are easy to modify do not need procs. On the other hand, I generally will choose the mixed option where anything other than CRUD (i.e. workflows) will be sent to a proc. I have a particular interest in hearing about your experiences with larger projects (i.e. 100+ tables in the DB) that employ a Domain Model approach to a layered solution (has distinct UI, business, and data access layers.) However I'm interested in responses to all sizes and shapes of projects.Opinions?
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Aug 20, 2009
When bulk renaming files (14000 of them) i get this error: The CLR has been unable to transition from COM context 0x4cefd8 to COM context 0x4cf148 for 60 seconds. The thread that owns the destination context/apartment is most likely either doing a non pumping wait or processing a very long running operation without pumping Windows messages. This situation generally has a negative performance impact and may even lead to the application becoming non responsive or memory usage accumulating continually over time. To avoid this problem, all single threaded apartment (STA) threads should use pumping wait primitives (such as CoWaitForMultipleHandles) and routinely pump messages during long running operations.
My code is as follows:
Private Sub frmTest_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim asd As List(Of String) = FileIO.FileSystem.GetFiles("D:Music").ToList
Dim rs As New ADODB.RecordSet("SELECT * FROM Songs", My.Settings.Files_Database__Connection)
[code].....
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Aug 12, 2010
I was reading the MSDN manual, I was reading about the about the binding.source property. I got a little confused because the manual started taling about the data context property. My question is what is the data context property ? Whenever I look through the properties of an object ( either textbox, datagrid etc ) I can't see this property listed anywhere.Could it be that the version of visual basic that I'm using ( which is Vb 2008 express ) doesn't include this property.
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Apr 15, 2009
I'm using a context menu strip that gets its data items from code that grabs filenames of .BAT files in a pre configuired directory. I need to execute code depending on which toolstrip menu item is clicked, i kno how to do this is the items are hard coded but not when they are dynamically added at runtime
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Aug 8, 2009
[code...]
In particular the MetadataProviderFactory Line... I can't quite seem to figure out how it should look in VB.
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Jul 2, 2009
I have a context menu strip (named cmnuRtxtIT) that pops up by right clicking on top of a rich text box in a VB 2008 WinForms application. Context menu strip cmnuRtxtIT has one item named ToolStripMenuInsertFld. This last one has one dropdown item named oolStripComboBoxFlds which is a ToolStripComboBox type. I do the following in the form's Load event to bind ToolStripComboBoxFldsto an Sql database:
Dim dt As New DataTable
Dim dta As New SqlDataAdapter("SELECT pkID, txtFlds FROM ApplicationFields", goConn)
dta.Fill(dt)
[code].....
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Feb 25, 2011
I'm currently trying to create a NEWID() function in my DataContext in LINQ using the solution here, however, when adding the partial class to my DataContext.vb or a separate DataContextPartial.vb, I get the error System.Data.Function is not available in this context because it is 'Friend'.
I've come across this when accessing data types before and that was in easy fix of setting it to Public, but I'm not sure where the properties for function could be or how to change them.The code I have is converted to VB.NET from the C# in the linked answer above:
Partial Public Class CMSModelDataContext
<[Function](Name:="NEWID", IsComposable:=True)> _
Public Function Random() As Guid
[code]....
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Oct 10, 2011
I've done this many time before, but for some reason I can't get it to work this time.I'm trying to get a ContextMenuStrip associated with a DataGridView. I've defined each to the form and in the properties of the DataGridView I've set the ContextMenuStrip property equal to my ContextMenuStrip name (cmsDictionary), defined the onClick event code, but when I run nothing happens.
The program was originally code with a dynamically added context menu but it was popping up all over the place and I wanted to remove that and just let the grid manage it.
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Jul 27, 2009
If I'm extending OnCreated for a LINQ to SQL table object, is it possible to get a reference to the data context to which the table belongs? For example, if I add a property to the data context:
Partial Class MyDataContext
Private _myValue As String
Public ReadOnly Property MyValue As String
[Code].....
I don't want the property on the data context to be Shared, because it could be different per instance. I've been pouring over the designer code to figure out where the reference might be, but no luck yet.
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Jun 8, 2011
I got this message because of a long process: ContextSwitchDeadlock was detected
Message: The CLR has been unable to transition from COM context 0x3dc190 to COM context 0x3dc300 for 60 seconds. The thread that owns the destination context/apartment is most likely either doing a non pumping wait or processing a very long running operation without pumping Windows messages. This situation generally has a negative performance impact and may even lead to the application becoming non responsive or memory usage accumulating continually over time.
To avoid this problem, all single threaded apartment (STA) threads should use pumping wait primitives (such as CoWaitForMultipleHandles) and routinely pump messages during long running operations. I've poked around on the internet and on a forum, someone suggested to use application.doevents(). I did that and the messaged goes away. In an earlier thread a member wrote that using application.doevents rarely was used appropriately. Is my situation a proper usage of application.doevents or is there something else I should be doing?
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Jan 15, 2012
Im using ms-acess 2007 as database and this issue is ridiculous.i run the FORM and enter some details ! and now i click display and display the data that was entered! this thing happens while im DEBUGGING sometimes when i stop debugging and debug again the data that was stored previously its not even getting displayed!! and its not even present in the actual database ! this doesn't happen every time!! this is weird and i dont understand , whats causing this issue?
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Oct 23, 2009
I want to know wot is the binary data stored while writing on the cd.I jus want the exact binary sequence present on the cd/DVD..
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Mar 28, 2009
i was just wondering if there was a way that i could compare data stored in a text file such as usernames and passwords with data input into text boxes in visual studio vb2008?
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Apr 23, 2012
ive made changes to my data stored in the database for a login i.e. ive changed the password that is stored in the database however for my application to continue the previous password still has to be used does anybody know why and how to change this, this also is the case for new entry's in the database i.e. new users. I also had an update button that also no longer works i think this is because of the same problem. I think the problem is that its saving the data changes from the update to the data set and not the database its self can this be changed?
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Jun 7, 2011
how to extract all the files with the index in the ALCHEMY version 4.1 of IMR. I'm trying locate the files stored in it but it seems like it is compressed in a .DAT file.
Another thing:Is there a way for us to extract files inside the .DAT file?Back to the Alchemy software is there a way that the unstructured database used buy alchemy can be transferred to another form of database like MYSQL of MS SQl?Another one, have anyone of you encountered a file with the extension .00r?I have this file with .00r file extension and my client said that this file contains the images and indexes. HOW CAN I EXTRACT OR VIEW THOSE FILES?
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Mar 11, 2010
I am having trouble retrieving data from a stored procedure that I have set up as a Data Adapter using VB.NET 2005. The Database is SQL Server 2000, and what I am trying to access is a simple Stored Procedure that will validate a users login access. [code] I have a dataset set up as AdjustmentsDataSetspValidateLogin. I am trying to figure out in code how I can address this using a table adapter or how I can capture from a login form I have created the UserID and pass this value to the stored proc to return the current record, if any of the user.I initially setup a Dataset and dragged the dataset onto a form. Then I deleted the data navigator and the toolbar that was created by default so that I could just pass values to the Stored Proc. I also have the table adapter setup to return a table "LoginData" with the two fields Approver & Admin when I pass a userID.But I am having difficulty addressing the table adapter in code and pulling back the data values for the UserID I'm passing to the DataSet.Does anyone have any ideas on how I can call this stored proc and get the data values returned? I'm new to .net programming. [code]
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Feb 28, 2011
Dim parm1 As New SqlClient.SqlParameter("@Category_ID", "")
Dim parm2 As New SqlClient.SqlParameter("@Category", "Value1")
Dim parm3 As New SqlClient.SqlParameter("@Area_Name", "Value2")[code].....
i am using code 1 to insert data into a table via stored procedure 2 now i am trying to retrieve that data using stored procedure
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Mar 16, 2012
i am trying to find examples of getting data back from a stored procedure that has no parameters sent to it nor has any returned output parameter. Though it does display data.How can i get that from my code im using below?
Dim myCommandSQL As New SqlCommand
Dim myReaderSQL As SqlDataReader = Nothing
Dim intX As Integer = 0[code]....
The @return_value i just put there to see what would happen but i got nothing returned.
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Oct 30, 2011
For some reason my code is not adding customer to the session. I am new to ASP.NET does anyone have any input as to why this is happening and maybe able to give some code example.
Below it the code.
Imports System.Data
Partial Class _Default
Inherits System.Web.UI.Page
[Code]....
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Jul 13, 2010
I'm using Microsoft .NET Framework 3.5 to create a web service with VB.NET. I'm using a Stored Procedure in SQL Server 2008 so that SQL can insert all the data that I'm passing. The problem is that in one of the servicse I need to pass around 10,000 records and it's not very efficient to run the stored procedure 10,000 times.
[Code]...
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Apr 1, 2009
i m working on the project like retrieving the data from the tally using our vb application and store the data in database. i have fetched the xml tags from my vb application to the tally by sql query. now my question is how to extract the data stored in between the tags using vb,.. and store in database.. i need the procedure and the code.
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Jan 29, 2010
I have two GridViews, the first works fine as I defined the datasource when I dropped it onto the asp page via visual studio and I specified the table to use.
The other GridView (dgvParams below) has just been dropped onto the asp page and I want to use it at run time[code]...
When I step through the code I can see row and column counts are as expected and call "dgvParams.DataSource = table".
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Jan 6, 2010
I have put together an array for data from two text boxes to be stored in. This works fine at the moment. I am now looking to build some form of array that will have some stored data in it already, so that someone can select the information they require from a listbox.
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Jun 10, 2011
I have the following code in my asp page:
Imports System.Data.SqlClient
Imports System.Data
Partial Class _Default
Inherits System.Web.UI.Page
[Code] .....
And while the page doesn't throw me any errors, I'm also not seeing any data in my datatable.
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Nov 8, 2011
I've easily found various QR-Code generators, but I need to use the data stored in the barcode on a regular desktop app using VB.Net and a WebCam or eventually an flash, javascript webpage to do the job.
Should there be an online service for this? Maybe a flash app?
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Sep 29, 2010
I developed a program using Vb.Net that is data based enabled, it has a field for serial number etc. its working fine but the serial number failed to update when a record is deleted, its always keeps tracks of its formal numbering, even when the program is restarted, unless reinstalled.How do i also backup the data stored in such program.
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Jul 7, 2009
I wish to create a stored procedure with multiple select statements. In addition, I then want to access each of the statements on the page load event. The purpose of the statements is to create multiple 'counts', and a number of labels on the page will each contain an individual returned count. At the moment I have created a basic stored procedure with two select statements:
CREATE PROCEDURE [dbo].[Finance_CustomerCount]
AS SELECT COUNT(Quote_ID) AS Count1 FROM dbo.generatedquotes WHERE (status = 2)
AND (Contract_End_Date >= GETDATE()) OR (status = 4) OR (status = 7) OR (status = 1)
SELECT COUNT(invoice_id) AS Count2 FROM dbo.invoices GROUP BY invoice_open HAVING (invoice_open = 'Y')
RETURN
I can then access the result of the first select statement by using this code:
Dim newconn As String = Session("ConnectionString")
Dim connection As New Data.SqlClient.SqlConnection(newconn)
Dim MyCommand As Data.SqlClient.SqlCommand = New Data.SqlClient.SqlCommand("Finance_CustomerCount", Connection)
[Code] ....
So what I basically need to know is, how do I access the second select statement result set for another label.
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