Programatically Refresh Linked Tables
Jul 15, 2010
I have an Access frontend with a lot of tables linked through ODBC to a MySQL backend. I have a VB.net application that sometimes adds columns to the tables in the backend, and when that happens, I need to refresh the link to the table in the frontend from the VB.net app to show the new columns.I'll consider just about any solution as long as it doesn't require restarting MySQL or Access, and will allow me to refresh only the links I need to refresh (which I know in advance) as there are hundreds of links and tables in the frontend.
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Mar 18, 2010
I am very familiar with VBA and have been using access and excel to create applications that connect using ADO and/or linked tables.I'm looking to start developing simple Windows applications for my company using Visual Basic, that will connect to Oracle and SQL Server Databases using ADO. What do I need to accomplish this? If I purchase Visual Studio 2008 Pro, will it come with VB? And do I need anything in addition to this in order to connect to SQL or Oracle databases using ADO method?
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Mar 23, 2009
One of the things I'm trying to do is work out the total profits for a company, reading from an access database comprising of two linked tables. All the information needed for the calculation in question (Fees, Sold/Bought?, Cost/Income) are found in one form (Financial) and I want to read this information and carry out the required calculations within a sub.
Here is the calculation in Pseudocode I wish to do:
Do
If SoldBought = Sold then
Total = Total + Cost/Income - Fees
Else: Total = Total - Cost/Income
Read Next Record
Loop Until End of Records
[Code] .....
Unfortunately, I encounter an error with the above. I get the following error;
"There is no Row at position 0".
How I could get this in motion - I've been stuck in a rut for days trying different things out and I've come to accept that I can't do this alone.
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Apr 14, 2011
I have a system that gathers raw data from electronic devices, uses that data to populate a set of tables and allow uses to add/edit certain data and report on it. (Kind of basic right...NOT) There are 3 applications that I've written that use the same database.
One is a client that is on 3-4 user machines which allows them to see the data that has come in and work with it.
Two a Data-to-Information process program which takes the raw data, checks up certain information and puts the results into the database.
Third is a data gathering app that interfaces directly with the electronic devices and about 10 times per day places the raw data into a single table in the database.
If a user is in the 'client' application the data processing application crashes all over the place:
1. Database file already in use.
2. Unrecognised Database format
3. File locked exclusively by User on PC X.
Almost always on a different line of code and once when I made it retry over and over I managed to corrupt the database and had to Compact and Repair it to fix it. If no one is using the client everything works perfectly. On each client machine is a database with linked tables to the server machine. The machine that is running the Data processing is the server and the processing is using a database in a different folder that also has linked tables.
I have gone through all the recordsets in the Data Processing application and made sure that they are only using ForwardOnly and Read Only. They edit the data only with Insert, Update or Delete queries. I'm about to do the same in the Client Application as it seems to be the one that is locking everything all the time. The client machines haven't crashed on that error at all. Does it matter which version of Access is on the client and server machines? (All the clients have Access 2003 and the server has 2007 but the Database was created in 2003). Should I just convert the Access database to SQL server and be done with it?
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Aug 3, 2009
I have an access 2003 database file with hundreds of queries. I would like to rename all tables referenced from within my queries based on a condition
If tableNameInQuery = "tableName" Then
tableNameInQuery = "newTableName"
End If
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Aug 1, 2011
I have an VB application that I developed in Visual Studio 2008. The back end is SQL. Application stores quite a bit of information and gets updated daily by users. It also connects to AD to get u/p, adds new accounts in AD and adds mailboxes. Users connect to it through Citrix. We noticed big spikes in memory usage. The executable itself is less than 5Mb; if I run it and it opens main form - memory usage jumps to about 19Mb, open a report - it jumps to 80 Mb. If I open the form that is linked to multiple tables - it jumps to 157 Mb. Once users start pulling new information in, update it and connect to AD or Exchange - it could jump to 250 Mb. Also noticed that if user with read only rights has application opened and idle - memory usage constantly changes with a pattern
like 17Mb - 19 Mb - 15 Mb - 17 Mb and so on. This user wasn't even using computer at the time. In general - what could cause such jumps in memory usage? What is the best way to prevent it? On the server we have Windows Server 2003 SE
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Feb 19, 2008
I have code that connects to queries in an access database.
[code...]
Is the data not filling in because of the schema information not being retirieved? If so, is there a way around that?
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Apr 9, 2009
I need to load a list of tables and linked tables in an MS Access Database into a combo box. I have this.
vb.net Imports System.Data.OleDb
[Code]...
1. How do I load the access tables and the link tables into my combo without the system tables showing up?
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Jun 5, 2009
Lets say i label "label1" , and 2 buttons named "button1" and "btnRefresh " [code]So , when user press the button 1 , the text will change. But what should i put inside btnRefresh to reload the forms ? and display the default label.text = "Form Load" ???
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Jul 25, 2012
I am using VS2008 and SQLite. I have created a database and several tables and am attempting to populate the tables with data from arrays.
The following code (example) works fine but stops after it inserts 30 to 50 records. I am running the VB code in debug mode and when it stops, I press pause to see where it is. It stops on "SQLcommand.ExecuteNonQuery()" and when I press continue (F5) it will insert another 30 to 50 records.
I do not get an error message. Is this a timeout issue? How do I keep the loop running to the end of the array?
Following is example code.
Dim
SQLconnect As New SQLite.SQLiteConnection()
Dim SQLcommand As SQLiteCommand
CODE:.....................
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Jul 12, 2011
have a datagridview containing 2 tables left joined, so that:table1 LEFT JOIN table 2 ON table1.id=table2.idI get an error whenever I try to edit my datagridview."invalidOperationException was unhandled by the user codeDynamic SQL generation is not supported against multiple base tables."The error points to this line:
da.FillSchema(dt, SchemaType.Mapped)
da.Update(dt) << This line
'da = dataadapter
[code].....
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Oct 29, 2010
In my datagridview I was fill in using join tables (table1 = pr_employees, table2 = pr_employee_deduction). My problem now is during save button I want to update records from table2 only.[code]
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May 10, 2012
We are presently developing an application, let's call it APP1, which uses a SQL Database which have about 800 stored procedures, 600 tables, etc. APP1 was originally created in order to replace another application, APP0, from which we do not have source code but only SQL tables, Stored Procedures, views, etc. Previous programers of APP1 used some DB objects from this same database and added some other objects specific to APP1 because it becomes bigger than APP0. And we do not need APP0 anymore as APP1 does all what we want, and more.
So, now, we are thinking about a way to find out which objects are used by APP1 in order to remove objects which are ONLY used by APP0.What is the best approach to discover all objects used by APP1 without having to open every single class and form?
Once we will have a complete list of these objects, it will be easy to use a program we bought which detects all dependencies for all SQL Objects specified directly from SQL and remove objects which do not return from any dependencies. Any ideas of how I could get this list without having to go through all our program that have many, many, many classes and forms?
Note : I know, in a perfect world, all calls to PSs and tables should be in a DAL but in the case of the application we're presently working on ... this is not our case! Yippy! (sarcastic yippy) ;)
Note 2 : This application is not using any ORM. So all queries are directly using SqlCommand. So any call to any DB objects are in string format.
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Mar 25, 2009
I have a 5 tables in my database and i want to access all my tables togather at a time.e.g.I have a code for one table i.e. rs.Open "select * from Group_info", con, adOpenDynamic, adLockBatchOptimistic. instead of Group_info table i want to access 5 tables also as Login_table,User_info table,group_name table etc. How i do that
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Jun 29, 2009
I'm using VS2005.After I install an application using an .msi. Everytime this application loads it tries to find the setup and installs itself again if a file has been modified. If I delete the .msi file then the application can't even load.Is there a way to remove this link between the application and the msi?
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Jan 9, 2012
I have a large number of MS Access databases that I'm automating to relink tables. However, there is one table that can't be relinked normally as Access says it has too many indexes. A manual work-around is to link to the view in SQL Server (2000/2008) and rename that table.Now, I want to do this programatically (I'm using DAO to relink the tables, which works nicely). I've been looking at CreateTableDef, but I don't know if this is the right way of going about it. I don't want to hardcode 260+ fields that may change (this is the main table from a 3rd party vendor, so I have no control over the fields in this table, or any normalization for that matter, but that's another topic...).Also, 98% of the tables being changed are Access 2000/2003 tables. The other 2% are Access 2007/2010.[code]
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Nov 22, 2010
Currently I have DataGridView box, clicking generate button fills it with a query from the database.I want the add button to add another row filled using the same query, so far I cannot get it to do it.Current generate button code:
Me.TableAdapter.FillBy1(Me.DataSet.App)
Add button code:
Me.DataSet.App.Rows.Add() - this does add a new empty row
I tried sticking the generate code inside (between add brackets) it but that just did the same thing as the generate code.
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Feb 15, 2011
I have a notification icon that is supposed to pop a bubble whenever a webbrowser object's file title changes to a specific value. Unfortunately, it won't do what I want. When I wait, and change the title from another line (Mibbit chat, so changes title when someone speaks) it still won't show a bubble.
Here's what I have:For value As Integer = 10 To 0 Step -2
[Code]...
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Feb 26, 2009
I badly wanna Serialize a Linked List into XML and deserialize it back when required. I didn't get proper results when i did google. But, I learnt through the following link that it's not possible to do so. [URL]
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Oct 19, 2011
I have the following function that combines objects based on their gameScore attribute [code]NOTE the function is in a different class than where I have the lists I'm giving it..I had to set all the game positions blank because it saw an object with the same ID but different position as a different object. I didn't realize that even though I passed in the list ByVal the code deletes the courses on the original list somehow.First I input the origonal list expecting it not to be altered and put the output as a new list.[code]Yet somehow even the last one deletes the gamePosition attribute on listGames BUT *Doesn't* do the sum funtion for them, why is this happening it doesn't make any sense, it shouldn't touch listGames
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Jun 19, 2010
Seems to work sometimes, but when i navigate to other pages, sometimes it works soemtimes it throws and error.Error:Value of '1000000' is not valid for 'Value'. 'Value' should be between 'minimum' and 'maximum'.In the prgressbar1 properties i have maximum set to 2000000The progress bar just zipps through, and dosent really look like its "checking: the process.
Private Sub progress_changed(ByVal sender As System.Object, ByVal e As System.Windows.Forms.WebBrowserProgressChangedEventArgs) Handles WebBrowser1.ProgressChanged
'Update Progress Bar
[code].....
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May 26, 2010
How can I download a pdf and store to disk using vb.net or c#? The url (of the pdf) has some rediection going on before the final pdf is reached. I tried the below but the pdf seems corrupted when I attempt to open locally,
Dim PdfFile As FileStream = File.OpenWrite(saveTo)
Dim PdfStream As MemoryStream = GetFileStream(pdfURL)
PdfStream.WriteTo(PdfFile)
PdfStream.Flush()
[Code]...
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Mar 4, 2010
I have a .NET dll which I use from a C++ program. Now I have to register the dll programmatically on a deployment computer. How do i do that (programmatically! not using regasm)? I remember, when I once called a VB6 dll from a C++ dll, I had to use DllRegisterServer and DllUnregisterServer. Is that still so with a .NET dll? It seems I have to somehow add the dllregisterserver function to the .NET dll.
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Dec 7, 2011
I have a VB 2010 class like
Public Class cStar
Public Name As String
Public Magnitude As Single
End Class
I want to add stars into some doubly linked collection or list that is ordered by magnitude.
I tried to create my own list cList based on collection
Class cList Inherits collection error - collection not inheritable End class
I had hoped to enable things like
Dim Star1 as cStar
Dim Star2 as cStar
cList.AddFirst(Star1)
cList.AddLast(Star1)
Star2 = cList.Behead
[Code]...
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Jun 3, 2011
I am trying to make a form that is blank and will add in 2 comboboxes, a textbox, 2 buttons and a checkbox next to each other in a row. I want the controls to be part of an array, so that all controls on a row are associated with that array number.I am currently able to make the first row appear when the form is loaded, however when i click one of the buttons(which are used to create thenext row of controls) it comes up with an error stating that the index was outside the array bounds.
Here is the code I currently have:
Public Class frmWhere
Public SQLString3 As String
Public locationy As Integer
[code]....
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Jan 16, 2012
This my data list:
<asp:DataList ID="DataList1" runat="server" DataSourceID="SqlDataSource1"
RepeatLayout="Flow">
<ItemTemplate>
[Code].....
And I want to add an event to my DataList button and excute the method.
I don't know how to do it correctly.
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Sep 2, 2011
I have a search engine on my ASP.net 4.0 VB site that in which I need to link the search results with their individual pages. I understand that this can be done simply with a submit button after the search textbox but a submit button wouldn't fit next to the search bar on my page, plus it wouldn't look right.
[Code]...
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Dec 18, 2009
General question on linked resources. I just want to clarify what an application does with linked resources. For explanatory purposes lets say that my resources are a bunch of images. My understanding is that linked resources are really just a reference to where that resource is on disk, whereas embedded resources are stored as part of the application.
[Code]....
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Mar 3, 2012
i have a simple relationship which is shown in the link below
[URL]
after doing much research i cannot find a proper way of deleting rows which are linked in all 3 tables. This is the code i am using currently
strsql = "delete * from cg_security_user_right where user_id=@field1 & right_id=@field2 "
Dim objcmd As New System.Data.OleDb.OleDbCommand(strsql, acsconn) ' the oledbcommand
With objcmd
.Parameters.AddWithValue("@field1", TextBox1.Text)
[code]....
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May 2, 2011
if I'm getting the right results plus I'm getting a null exception error when I use my clear, delete, contains function
Code:
Public Class doubleLinkedList(Of T)
Implements ICollection(Of T)
Private Beginning As NodeLink(Of T)
[code]....
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