Showing End Users Foreign Key Constraint Warnings?
Mar 1, 2012
I have an application that works with a database that uses foreign key constraints.
For example, we have an inventory table that has a foreign key constraint that references a table called case_names. If a user attempts to delete a case name that has any inventory items referencing it's ID, the action is restricted.
How can I display a message to the user that they will understand? 'You can not delete this case as it still contains inventory items.'
My thought is a try-catch (catching different error types?) but I do not really want to use this for something that may be expected.
The application is in VB.Net using MySQL.data
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Mar 20, 2010
I'm developing an app in VB.Net (Visual Studio Express 2008, on Windows Vista) that connects to an Access relational database. The database has 3 related tables (TextSections, LineItems, Cycles) that I'm loading into my dataset. I've set up two foreign key constraints and want all changes to cascade through the related records in the child tables. I cannot get the cascades to reflect through.
For example, when I delete the parent record, the children records remain (in the database - they are removed from the dataset). Also, when I modify the parent record (change the Description field for example), the change is not reflected in the dataset datatable that holds the children records - unless I go through and ReLoad all of the data from the database and re-Set the constraints. I have set the .AcceptChanges, .UpdateRule, and .DeleteRule to cascade, and have also set EnforceConstraints on the dataset. Why aren't the changes cascading through the children?
Below I've pasted (1) the Load Routines for my datatables TextSections (parent), LineItems (child), and Cycles (child of LineItems); (2) the method that creates the constraints in the dataset, and (3) The Save routine for TextSections.
Friend Sub LoadTSTable()
Dim key(1) As DataColumn
Dim newCol As New DataColumn
[code].....
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Apr 18, 2009
I just watched a video from Beth Messi about setting up a primary key and foreign key on a table.
I created two tables, one called customer and the other one called orders CustomerID is the primary key to the customer table OrderID is the primary ket to the orders table and CustomerID is foreign key to the orders table
Beth Messi said that this would maintain the integrity of the tables and she also mentioned something about setting up a cascade delete so that when we delete a record in the customer table, the customer's order in order table will get deleted as well.
how I can set up the cascade delete, Meanwhile, I tried deleting a customer record in customer table - a customer with orders, and I got the following error when I clicked save.
The DELETE statement conflicted with the REFERENCE constraint "FK_Orders_Customer". The conflict occurred in database "C:DOCUMENTS AND SETTINGSLOUISLOCAL SETTINGSAPPLICATION DATATEMPORARY PROJECTSWBINDEBUGTEST.MDF", table "dbo.Orders", column 'CustomerID'. The statement has been terminated.
Shall I use try catch to warn the user that the record that I tried to delete has an order? They can't delete the customer unless the orders table's record is deleted first?
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Jun 15, 2011
myCommand = New SqlCommand(
"INSERT INTO tblBook(BookCode, BookTitle, Author, PublishingYear,
Price, EnterDate, CatID, RackID, Amount)
VALUES('" & txtBookCode.Text & "','" &
txtTitle.Text & "','" &
[Code]...
The INSERT statement conflicted with the FOREING KEY constraint "FK_tblBook_tblCategory". The conflict occurred in database "CIEDC", table "dbo.tblCategory", column 'CatID'. The statement has been terminated.
Was that because of my database's relationships?
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Nov 15, 2011
I am new to VB.net and have created a simple master detail windows form. I created a two table data set and then dropped the master table on the form as a continues form or a detail form with several text boxes to enter data. The child form is a data grid and was simple drag and drop from the data-set. All of this was done with drag and drop and I have added nor changed any code.test data that I have added directly to the database shows up with the proper parent child relationships on the form. I can also enter new records into the database using the parent only portion of my form. I can also update a child record.When I attempt to enter a complete record with data in both the parent form and the child data grid I get this error.
The INSERT statement conflicted with the FOREIGN KEY constraint FK_tblComplainant_tblUseOfForce. The conflict occurred in database "C:\SQLFILES\CCTS_2.MDF", table "dbo.tblUseOfForce", column 'UOFID'. The statement has
[code].....
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Jul 20, 2009
I am using a number of tables on my application and two of which have a foreign key constraint I have set between them. When I change the account number on the main table via a combo box all of the relevant information for that table on the form is updated accordingly. However, the child table which has a foreign key reference to the Account Number of the main table is not updated when the acocunt number is changed. I have set the update to cascade in the references but still am having issues.
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May 13, 2009
I'm creating a program that uses sql statments to input data into a data base, but I'm having a problem with this error:The INSERT statement conflicted with the FOREIGN KEY constraint "FK_Job_ProductCode". The conflict occurred in database "FabList.mdf", table "dbo.ProductCode", column 'ProductID'. The statement has been terminated.
[Code]...
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Feb 21, 2010
While I've previously many years of relational databases and procedural languages, I'm stumbling with Visual Basic. In this problem, the simple situation is that I have two files, parent and child. The primary key of the parent file (Area file) is linked by a relation to one of the two fields that makes up the primary key in the child file (Project file) (unique key is formed from 'area' and 'project'). I have the default table adapters created on both files. I have created two maintenance forms showing one each of the two files in datagrid view format.I can create some records in the Parent (Area) file, but when I try to create a record in the child (Project) file, using one of the valid key values from the Area file, I get the 'ForeignKeyConstraint [relation name] requires the child key values [actual value] to exist in the parent table' which I'm absolutely definitely sure it does.
I haven't done any actual coding for those two maintenance forms, just dragged-and-dropped the files from the data sources screen onto separate forms so it creates the controls itself. But I can't work out, if it already knows the data does exist because I can load it back in to the Area maintence form, why it can't check itself to find out the record does exist. Why does it think the record from the parent record doesn't exist? It does exactly the same thing, whether or not the database is in access or SQL Server Express. I have all the latest updates.
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Oct 11, 2011
Getting these warnings while trying to debug,
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Oct 22, 2008
I'm not sure what I did to cause this. I just opened my program one morning and had a warning staring me in the face. I'm guessing by the common reference to VBIDE they are all cause by the same problem. What do they mean and how do I solve them.
Warning1Cannot find wrapper assembly for type library "VBIDE".DM Code Calculator
Warning2Unable to apply publish properties for item "microsoft.vbe.interop".DM Code Calculator
Warning3The referenced component 'VBIDE' could not be found.
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Apr 29, 2012
I have a bunch of warnings dealing with Crystal Reports, which I was going to use in the program but change my mind. deleted everything I can find dealing with Crystal Reports to no avail. I stall have 20 warnings.
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Feb 9, 2010
I have an asp.net web app that uses forms-based authentication, a SqlMembershipProvider (using an encrypted password format), and a SqlRoleProvider. I need to know if it's possible to administer the users (create new users, assign them to roles, etc.) from a windows application - the powers that be don't want any administrative functionality in the web app itself.Here is the membership provider definition from web.config:
<membership defaultProvider="MyProvider">
<providers>
<add name="MyProvider"
[code].....
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Dec 29, 2010
I've got a code using SQLClient that loops though all users in a Users table inside each loop i want to preform another search in the UserOrders table, thus doing a count of all orders.
I get this error
HTML
There is already an open DataReader associated with this Command which must be closed first.
Here is my code
vb.net UserLists.Items.Clear()
Dim connection As New SqlClient.SqlConnection(My.Settings.ConnectString)
Dim command As New SqlClient.SqlCommand("SELECT * FROM Users ORDER BY PersonName",
[CODE]...
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Apr 3, 2012
1.I�d like to publish a free vb.net desktop application for the users to download and use meanwhile I�d like to collect usage information ex: user ip address, user�s registration information, used features, time spent� if the user allows the report to be sent back.
2.Also , in order for the user to be able to use the application, he�ll have to register it then, everytime, before the application loads, it gets verified online that it was registered, maybe validate the registration information or a valid user name and password, no critical personal information. The target of this step is for the application to be used exclusively by the registered user and maybe on his computer only.
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Apr 4, 2012
1. I�d like to publish a free vb.net desktop application for the users to download and use meanwhile I�d like to collect usage information ex: user ip address, user�s registration information, used features, time spent� if the user allows the report to be sent back. 2. Also , in order for the user to be able to use the application, he�ll have to register it then, everytime, before the application loads, it gets verified online that it was registered, maybe validate the registration information or a valid user name and password, no critical personal information. The target of this step is for the application to be used exclusively by the registered user and maybe on his computer only. Any alternative way to achive the target is just fine.
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May 13, 2009
I have VB.Net code in VS 2008 using an obsolete method, and would like to suppress the warning.Unfortunately, following the recommendation is not a good solution, because it requires using a different class, which works differently, in important ways.I'm trying to suppress the warning using System.Diagnostics.CodeAnalysis.SuppressMessage, but I don't know what to write as the parameters for the attribute, and can't find any relevant reference.
I should also say that, right-clicking on the error in the error list I don't have any 'Suppress Message' option.
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Sep 2, 2009
So my project works exactly as I want it to. But I have these 2 similar warnings when I Build. I would like to understand and get rid of if possible. [code]
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Jun 10, 2008
I cannot figure out how to get this call to work.I have searched EVERYWHERE.MSDN is no help at all and the only thing I can find is this vb6 code that doesn't work in .net.I tried to convert it over but I've had no luck.Specifically I'm trying to get the path of the "All Users" Desktop and the "All Users" Start Menu.It would rock if anyone could help me out with this one.
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Mar 29, 2009
[code]....
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Feb 20, 2009
I have the following errors displayed at bottom of my Visual Studio.However, I do not actually have ANY error when I run the app.
Dim storyboard As Storyboard = Me.FindResource("Show Entry")
storyboard.Begin()
''''''''ERROR'''''''
[code].....
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Jan 23, 2006
I'm using VS 2005, after VB6 to VB.NET conversion we have fixed all the errors but still have unidentified number of warnings. Is there any way to increase this limit of 101 warning you can see after compiling? I want to actually see the total number of warnings to get an idea how much work is there.
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Mar 6, 2009
Was looking at some code earlier, and am thinking that there has to be a more elegant way of writing this...(returnVar.Warnings is a string array, it could be returned as any size depending on the number of warnings that are logged)
For Each item In items
If o.ImageContent.ImageId = 0 Then
ReDim Preserve returnVar.Warnings(returnVar.Warnings.GetUpperBound(0) + 1)
returnVar.Warnings(returnVar.Warnings.GetUpperBound(0)) = "Section: " & section.<header>.<title>.ToString & " , Item: " & item.<title>.ToString
End If
Next
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Mar 11, 2010
Is there a way in Visual Studio (2008 or 2010, don't care right now which one) to show all warnings and/or messages in a project?Currently, I see all warnings and messages for all open files/documents. It would be handy if I could switch an option somewhere or something to show all the warnings and messages without needing to open everything.(I ask this as I'm developing a web site in VS that I have inherited from an ex-colleague and there's lots of messages per page regarding outdated attributes and the like)
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Mar 4, 2009
I am creating my very first Service application and it seems to be quite simple to do. I want to create an eventlog so I can write away any exceptions that may occur. Is this the correct way? I have the following
If Not MyLog.SourceExists("MorrisonsSync") Then
MyLog.DeleteEventSource("MorrisonsSync")
End If
[code]....
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Jul 13, 2010
Is there anyway to disable the vb.net (2008) express popup for converting older projects as well as the security warning to browse the project? I'm fairly new to vb.net so of course I download lots of examples to learn off of and it is BEYOND annoying to have to convert every demo and then click ok to browse the code.
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Jan 16, 2009
For our VB.NET websites we use SVN for Source Control and CruiseControl.NET for continuous integration.
To use the SVN build number in the compilation by CruiseControl.NET we need to use Web Deployment Projects. We then replace in the configuration file the Version field with this variable from SVN Labeller[code]...
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Aug 15, 2011
I've just converted a project from .net 1.1 to 3.5, and I'm being given loads of warnings in the error list. The program compiles and runs ok, but I think I should probably try to at least reduce this large number of warnings.The trouble is that the error list only tells me about the first 102 warnings. Even when I fix one, the number stays at 102. So I have absolutely no idea how many warnings there actually are. If there are 150, I'd like to get rid of them. But if there are 10,000, I don't have the time to fix them all.Is there a way to see the actual total number of warnings?
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Nov 25, 2009
VB.NET has this rather annoying limitation which caps compiler warnings reported at 100.vbc : warning BC42206: Maximum number of warnings has been exceeded.This makes things rather frustrating when trying to size up the amount of effort that would be required to comply with VB.NET best practices, such as enabling Option Strict.
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Dec 22, 2010
I found some code on the internet as below (slightly modified).It simply requests the content of a webpage.However I get two warnings:
Warning 1 Variable 'srRead' is used before it has been assigned a value. A null reference exception could result at runtime.
Warning 2 Variable 'Str' is used before it has been assigned a value. A null reference exception could result at runtime.
I know I can simply forget about the Finally and add the code to the try block.Will that be the way to go or can I prevent the warnings using a different approach?
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Apr 21, 2010
I have a freshly initialized array that's being passed to a sub routine ByRef to be populated. The array is always empty when passed to the sub routine, which ReDims it as necessary.However, VS complains about this in a Warning:
Quote:
Warning1Variable 'MyArr' is passed by reference before it has been assigned a value. A null reference exception could result at runtime.
Dim MyArr() As Integer
Dim AnotherArr() As String
Call MySub(MyArr, AnotherArr)
The MySub routine populates both arrays. This Warning is meaningless because I very specifically want to pass the arrays to the sub routine BEFORE assigning values because those values will be assigned by the sub routine.Can I disable this type of Warning? No null reference exception will occur because that is being handled by the sub routine.
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