Entity Models Linked To MS Access (MDB) File?
Sep 10, 2009I'm using VB 2008 Express SP1. Is it possible to create an entity model that links to an MS Access (MDB) file?
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Sharing Entity Framework Models With Other Projects Using MEF
Nov 23, 2011I am currently developing a Windows service and I am am looking to use MEF to compose all of the services components at run time. The data access module (project) is using Entity Framework 4.1 and a Domain Service Class to perform CRUD operations on the entity model.
The problem I have is how to share the models outside the DAL project when composing the DAL into the worker class in the main project.
For exmaple this is one of the methods in the DAL contract interface
Function GetInspectionFaults() As IQueryable(Of InspectionFault)
This interface is currently in the DAL project (not the shared/referenced project containing the other contract interfaces) as it needs references to the entity model for the POCO types.
How do I shared these POCO types?
DataGridView Add Row (Linked To Access Db)?
Nov 22, 2010Currently 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.
Little Program Which Is Linked To An Access Database
Mar 30, 2009I have started a little program which is linked to an access database, and it basically allows the user to input a name and a picture, with the file path stored in a text box and the picturebox getting the picture location from said text box. At the moment I am using the BindingNavigator to go between data. Everything works fine, however, whenever I press previous or next, the picturebox loads up the picture using the file location of the previous datas picture field. How can I tweak this so that when I press next or previous it loads the picture into the picturebox using the file location of the data I am going to, not coming from? [code]
View 5 RepliesQuery In A Linked Access Database?
Aug 26, 2009I know how to do the type of query in this thread [URL] I am wondering know how to do the same thing with linked datatables.
Or is there no difference, i just don't need to have "Where" clauses?If you're not living on the edge, you're taking up too much room
Building A Program That's Linked To A Ms Access Database?
Dec 26, 2009Im building a program that's linked to a ms access database. the function i use to update a row... In order to save a lot of typing i inserted a for loop that uses a directcast function. i did this because i have numerous text boxes that i name tb1, tb2, tb3, tb4...etc and they each correlate with row 1, row 2, row 3, row 4...etc in the database.[code].....
View 1 RepliesHow To Index FoxPro Table Linked In MS Access
Sep 10, 2009I have a foxpro table <b> INVENT.DBF</b> linked in MS ACCESS. When I tried to do a search in the table from vb.net application, it is taking a long time. So I want to index the foxpro table and then use it for search.
Here is the sample code I wrote in vb.net <i>
cn = New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=D:database.mdb;Persist Security Info=False")
cn.open()
cmd = New OleDbCommand("Create INDEX itmno_idx ON INVENT(ITEM_NO) ", cn)
cmd.ExecuteNonQuery()</i>
But I am getting error "Cannot execute data definition statements on linked data sources"
What needs to be done to index a linked foxpro table using VB.NET.
Access 2007 Linked Table With ODBC Transaction?
Oct 4, 2011a simple question which i couldn't find an answer on the web.
View 7 RepliesIntermittent Access Database Error (Linked Tables)
Apr 14, 2011I 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?
Avoid Linked Table Manager Message While Opening The Access DB?
Jun 27, 2012My Application ( Vb.Net) is to scan Access DB forms and find out the Activx control if present and it works fine. But my problem is.In some DBs we have tables with mapping path to specific locations (Table Property->Linked Table Manager) and when we relocate these DBs then we need to change the path manually otherwise it will show a message to re-link ( Access DB message) while opening the DB. And I am facing same problem while scanning through my Tool as well and my process stops, continue only by manual intervention.
Do I capture the massage event and send some user specific message to user in the Log file or Report and continue scanning further?
Update Records In An Access Table Linked To A SharePoint List From VB?
Jan 23, 2012I am writing a small program to update data in a SharePoint list. Now where I cannot develop or use applications for SharePoint unless I am on a SharePoint server, I thought I would cheat the system by using Access to link to SharePoint lists, and then use Visual Basic to play with the Access tables. I need additional functionality other than what VBA can provide me, so that is why I am using the VB layer.Is it possible that this is not permitted? Whenever I try to update an item in the table, I receive the message:
"cannot update '(expression)'; field not updatable"
The word 'expression' here is not a filler I added, this is the actual error.If I try to make the edit manually in the table using Access, it works fine (I haven't tried it through Access VBA yet...).
How my code works is this:I have a Dataset added to the project which connects to the Access database. I add one of the tables to the dataset and create a Class object to reference the table adapter (essentially a Data Access Layer). I can read all of the data fine, and when a change is made in SharePoint, my application sees the updates when it refreshes. But when I try to write back to the table I get the error message above.
For
Each r As
DataRow In TableAdapter.GetData.Select("Name LIKE '*" & FileName &
"*'")
[code]....
There are other columns in the table and some of them have default null values. I only want to update these two fields, but it almost seems like this is not possible. I thought I might be somehow opening the Dataset in a Read Only mode, but I can't seem to find that option anywhere.
DataTableAdapter.Update Doesn't Insert New Records In The Linked Access Database
May 20, 2010I am writing an application that does a number of different things with data downloaded from hardware which is monitoring the power used in my home and produced by my PV Solar array. I have run into a roadblock early on, because I cannot seem to get new data into an Access database that I have linked to my application by means of a DataSet. I have checked the DataAdapter's InsertCommand, DeleteCommand, and UpdateCommand definitions (created by the DataSet Wizard), and they seem to make sense, and nothing is throwing exceptions or otherwise making VB complain, but new rows added to the dataset are not being added to the database.
[Code]...
VS 2008 Connecting To A Sharepoint List Linked Table In Access 2007
Apr 30, 2011First timer here, I love the site!
Running:
- VS 2008
- Sharepoint 3.0
- Access 2007
- Windows Vista (The machine I'm developing it from)
History: (Do excuse me if I don't reference different methods I've taken so far correctly, I'm still learning!) I am building some search software for a law firm that I work for in Australia. It's all coming along really well, but I seem to have hit a snag getting data out of sharepoint lists and into my project!
I first attempted to add a web reference to sharepoint and after a while was able to pull in all of the data from the lists, fantastic!(OR NOT!). The issue then was when I attempted to load it up into an array using XMLNodes, whilst it loaded up fine and I could see all the data, if there was a null value in one of the columns, it wouldn't pull that null value across, therefore, I couldn't really use the data...
[Code]...
DB/Reporting :Access Has Linked Tables - Attempted To Read Or Write Protected Memory
Feb 19, 2008I 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?
Asp.net Mvc - Send Two Models Into One View .Net In VB
Jul 11, 2010Edit one more time:
So it looks like I have figured out the address part too, in the class I have:
Public ReadOnly Property addresses As IEnumerable(Of Address)
Get
Return _these_addresses
[code].....
I know I can't have just System.Web.Mvc.ViewPage(Of IEnumerable (Of TotallyAwesomeCRM.Contact)) that it will have to accept more than that. I tried jacking with the Model.FirstName part saying Contact.FirstName, but that didn't come up in the drop down when I started writing Contact. I could do this easily in other languages, .Net seems to be a different ball game.
Asp.net Mvc - VB MVC Re-using A Partial View For Multiple Models
May 4, 2012I have a bunch of models that contain audit info (CreatedBy, CreateDate, UpdatedBy, UpdateDate). I'd like to create a partial view for displaying this info and then use it for the 20 or so tables. Is this possible?
View 1 RepliesMake A 3D Game (With Blender Models)?
Feb 15, 2010How would I make a 3D game (With Blender models), in Visual Basic, with a chat, and you can see other people?(Like see other people walking around, and if someone pulled out for example a sword, you would see that)
View 4 RepliesDragging A Record From A Linked File?
Apr 29, 2012I'm having trouble dragging a record from a linked file. The structures for the three files
Customer File:
First Name
Last Name
Address etc
[Code]...
how do i then display all the records in the booking file, in a listbox - but to also populate the relevant details from the other files. Example: after displaying the Customer ID in the booking file, to get the first name and last name from the customer file.
Asp.net - Linq Group By An Entity And Then Order By The Grouped (nullable) Entity
Jul 27, 2011I am trying to build a survey engine from an existing database design which is like this.
[Code]...
The line Order By Key.RecordOrder throws a null reference exception and I can understand why. Can someone advise on how to resolve this by just modifying this one query? I am fairly new to LINQ and the necessity to write this project
[Code]...
Way To Read Settings Of An App.exe.config File From A Linked Dll?
Sep 14, 2010Is there a simple way to read from the global application.exe.config file from a dll?urrently I am loading the file as an XmlDocument but I wonder if there is a better solution.That's what I mean:If I create a new WinForms Project I have a Settings Tab in the Project properties where I can add some simple values (And I want to access the per Application settings, not the user beased ones).From my code I can access these values with:
Console.WriteLine(Properties.Settings.Default.SomeValue);
The Settings class is autogenerated in the file Settings.Designer.cs.Now I have the case where a dll need's to read the settings from the Main Application's config file. Is there a simple way to achive this? Currently I am reading the file as an XML Document.
.net - ADO.net Entity Framework - Update Only Certain Properties On A Detached Entity
Jul 22, 2009I want to update an entity without loading the entity from the database first. I've accomplished this but only by knowing all of the entities properties and then using the "attachto" method. My issues is i don't want my app to need to remember all of the properties. Example:
[Code]....
.NET Sample Entity Framework 4.2 Code First Entity Splitting?
Dec 14, 2011Entity Splitting: one class, two or more tables.Here is how it is done in C#, but I need to get it working in vb.net.One more thing: the class name and table columns do not match, so I have to be able to map that out, too.I have to get this to work this way because the place I'm working at right now is a vb.net only shop and the database schema is fubar, but they have so much (millions) of lines of code done directly against the database in both asp classic, vb.net, AND asp.net webforms that changing the schema right now is not realistically possible.
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
modelBuilder.Entity<Post>()
.Map(m =>
[code]....
Asp.net - Using ExecuteQuery() With Entity Framework, Entity Class
Jan 16, 2011I am trying to jump from ASP Classic to asp.net. I have followed tutorials to get Entity Framework and LINQ to connect to my test database, but I am having difficulties figuring out ExecuteQuery(). I believe the problem is that I need an "entity class" for my database, but I can't figure out how to do it. Here is my simple code:
Dim db as New TestModel.TestEntity
Dim results AS IEnumerable(OF ???) = db.ExecuteQuery(Of ???)("Select * from Table1")
From the microsoft example site, they use an entity class called Customers, but I don't understand what that means.
C# - Inherited Entity Item Not Recognized As Entity?
Feb 11, 2011I am trying to create a generic typed class, but am running into a problem. Here is my basic class definition:
public class QueueObject<T> where T : System.ServiceModel.DomainServices.Client.Entity
{
public string LoadingMessage { get; set; }
public System.ServiceModel.DomainServices.Client.EntityQuery<T> Query { get; set; }
}
I am trying to add instances of this class to a queue
private Queue<QueueObject<Entity>> _queue;
this._queue.Enqueue(new QueueObject<MyEntity> {Query = MyContext.GetMyEntitiesQuery(), LoadingMessage = "Loading some stuff"});
This doesn't work. I get an error saying that QueueObject cannont be converted to QueueObject. I don't understand because MyEntity inherits from Entity.
Public Class QueueObject(Of T As System.ServiceModel.DomainServices.Client.Entity)
Public Property LoadingMessage As String
Public Property Query As System.ServiceModel.DomainServices.Client.EntityQuery(Of T)
End Class
[code]....
VS 2010 Clickable List Of Custom Colours Linked To Text File?
Aug 21, 2011I would like to create a little list in my Windows Form showing a list of custom colors with their 'friendly names'. Technically it can be anything (ListBox, ListView, Panel etc... whatever).
I simply want it to look something like this:
I would like to store data for this list in a simple TXT file in such form:
Quote:
Blue,Blue
Red,Red
#F6A118,My favourite color
#004080,Another color
And of course I would like each element on such list to be clickable, so if I'd click 'My favourite color' it should return the color's HEX value (#F6A118).
Create Database From Edmx Entity 3.5 File Programmatically?
May 6, 2011I'm wanting to create a database programmatically from the edmx or edmx.sqlce file in my project. I read the best practice when sending the data out to users this is the best way.But I haven't found anything on it. Or is it best to create it and send it out with the program? How would I do updates to the database if I did this? How do I tell which version the database is?
View 1 RepliesEntity SQLCE Can't Find Connection String In App.config File
Sep 21, 2011I've been getting this error when I try and use my model container:
No connection string named 'PFModelContainer' could be found in the application config file.
I have my edmx file in a separate project. I checked the app.config file and my model was there, and I also put it in my main project app.config file. Still doesn't work. Here's the connection string:
<connectionStrings>
<add name="PFModelContainer"
connectionString="metadata=res://*/PFModel.csdl|res:
[Code].....
C# - Are Microsoft Entity Framework And ADO.NET Entity Framework (.edmx) The Same
May 13, 2010c# - Are Microsoft Entity Framework and ADO.NET Entity Framework (.edmx) the same?
View 7 Replies.net - Application Linked To Msi?
Jun 29, 2009I'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?
View 2 RepliesHow To Add A Linked Table
Jan 9, 2012I 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]
View 5 Replies