WPF App - Update Database Directly From XAML
Nov 18, 2010
I have a WPF app that is currently driven completely from XAML. All fields, datagrids everything are bound from XAML using ObjectDataProviders objects. I have a DataAccessLayer (DAL) imported into the project. The calls to retrieve data using the ODPs are being used to display the data are all working. Is it possibly to perform inserts, updates, deletes using the methods that exist in my DAL directly from the XAML? I am trying to avoid ANY code-behind here at all to keep the UI a separate entity. I cannot find any clear cut examples with insert, update, deletes on this.
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Nov 16, 2010
I am trying to modify the MethodParameter directly in the XAML. I do have a working example where I am setting it from code. Code version is:
Dim odp As New ObjectDataProvider()
odp = FindResource("Products")
odp.MethodParameters.Clear()
odp.MethodParameters.Add(CType(txtCatId.Text, Integer))
ObjectDataProvider defined in XAML looks like this:
[Code]...
Is there anyway I can retrieve the value of my textbox (which is bound to a separate ObjectDataProvider and put that in place of the hardcoded "0" currently in my XAML? I am looking to have this be completely XAML driven and have not been able to get it working without the code change.
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Sep 17, 2009
I need to use the xaml writer to convert in string some controls. What I get is a string like this for example
[code]...
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Mar 7, 2012
I want to insert an image in .mdf file directly from the Picture Box, without using FileInfo.
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Apr 7, 2011
Basically I have a DataGrid on a form that is used to monitor attendance. I do this by making the data types for the relevant fields boolean so that at runtime, they appear as check boxes that the user can tick. If the user ticks this then the table in MySQL saves this as a 1, or if it is left unticked the table saves it as a 0. I then use those values in a mathematical equation to calculate weekly attendance.
My problem, however, is with saving changes to the table itself. Initially I set a primary key which was fine and allowed me to save. However I needed to turn that primary key to a foreign key and when I do that, I am told that I need a primary key. Now I got round that before when I was entering data into a text box and in my SQL query I'd simply put as my value being " & (name of textbox).Text & " but when I am entering data straight onto the datagrid, I am unsure of what to put in my SQL statement.
StudentID (Was primary key but turned it into foreign key)
Name
Surname
Monday
[cod]....
My friend from college told me it's probably because there are multiple records in the database and can't distinguish between the two (as perhaps there's no WHERE clause in that UpdateCommand) but I doubt it as it was working perfectly well with multiple records when StudentID was a primary key.
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Feb 17, 2009
1. Since the plate number will be stored directly into the database after being converted from the image. However, due to the conversion process of the image into text takes few seconds, it is not able to be stored into the database... May i know is there any code that can solve it? Maybe can delay the process of storing the plate number?
2. Why during running my VB, when i click on the listbox, sometimes it will immediately pop up a dialog box to ask for video source, but sometimes not? How can i solve it?
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Feb 24, 2012
i successfully load data from database to listbox, what i want to do is to add a record and then directly the listbox will update as well as in the delete.
[Code]...
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Feb 17, 2011
I'm am having a heck of a time finding a code snippet that works for this. I have got to the point where it appears the picture is stored as a blob (perhaps incorrectly) by using this [code]...
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May 6, 2010
I would like to be able to read a column of numbers from an Access database into a VB.NET program and then manipulate that data.For example I have a column of numbers and want to add them up and then take the averageThe maths is not a problem but how do I read the column of data into the program. I know how to do this if I first export the Access data into a CSV file, but
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Nov 24, 2011
I am trying to 1) write code in VB2010 that will get a JPG image from a Access Database field and write the image to a PictureBox 2) write code which will write a JPG file to an Access Database field. I have already sucessfully coded this in VB6, without fully understanding what I was doing.
Browsing the various forum's I have come across a few discussions on this subject, but due to my complete amerture status I don't seem to be able to follow the logic.
Below is the VB6 code
Writing JPG file to DataBase:
Dim bytBlob() As Byte
Dim intNum As Integer
[Code]....
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Jun 23, 2009
I am fresher in vb.net but I have experience in vb 6.0. But I want to connect database in sql server through sql connection. In that case how to create connection with window or sqlserver authintication mode and how to add or update new record in data base in batch transaction. Please help me with sample code.
So that I can understand eassily.
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Nov 15, 2011
update statement, i am trying to update a row within a access 2007 database here is my code.
[Code]...
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Apr 15, 2012
I am using vb.net with access database. I am using sql. How can i update database with the value 40'6"(Feet and inches values)
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Jun 26, 2009
What is wrong with this code. It does not update the access database and no error.
Dim conn As New OleDbConnection
Dim sqlQRY As String = "SELECT * FROM StdMaster WHERE StuNo = " & txtStudentNo.Text & " ORDER BY StuNo"
[CODE]...
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Apr 11, 2011
I have determined thanks to the last q & a that there is something wrong with my "save to db" code as well as my "retrieve to picture" code. Even If I manually save the pic in the db it stil wont retreive. This is code i patched together from 3 or 4 examples around the net.
Dim filename As String = txtName.Text + ".jpg"
Dim FileSize As UInt32
Dim ImageStream As System.IO.MemoryStream[code]......
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Feb 11, 2010
is there a way to update a database row with the update command by first defining all parameters and then all values just like you can in the insert command? "insert into table1 (parameter1,parameter2,....) values (value1, value2,....)"something like "set table1 (parameter1, parameter2) values (value1,value 2,...) where ...."?because I only know the syntax to define each parameters value "set table parameter1=value, parameter2=value2... where"
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Apr 20, 2010
This program is very difficult for me, but I must get threw it or I cannot finish... What I am doing is making a Database of foreign Languages with the spelling of the words and the pronounciation inside the database... The USER enters a paragraph of words into the translator textbox and pushed translate. The program has a DATABANK of words with the phonetic spellings and matches the word, then translates to phonetics. The problem is that new words keep appearing inside the language. So I incorporated a Database of 2 fields
[Code]...
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Jun 6, 2010
I created a dataset and i am using OleDbDataAdapter to insert new values to access database. But when i close the program and after open it, values are not in the database. How can i solve this problem? Also, i have another problem. When i write codes that
[Code]...
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Jan 8, 2012
I have been watching "absolute video tutorial". In those tutorials when doubled clicked on stuffs like "button" or "textbox", a code page appears named as "mainpage.xaml.cs" but when I use Visual Basics and do the same, on double click a page "mainpage.xaml.vb" appears. In this the coding stuffs are different. And when I write the same codes like in tutorial I get errors.
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Sep 14, 2009
Is there a way to access My.Resources thru Xaml?
Like this
<Image Source="{Binding MyImage,
Source={x:Static my:Resources},
Converter={StaticResource MyBitmapToImageSourceConverter}}" />
[Code]....
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Aug 11, 2009
i want to update my inventory table in database from another database name. Example: In VB, i had a form named Orderform. User need to select e product that they want and key in the quantity. all these information are able to store inside my database named ORDERTAB. but now the problem is i wanted to update another field in my database named INVENTORY by minus the quantity tat the user had key previously. i totally had no idea how it going to works.
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Jul 27, 2009
I was just wondering if it's possible to animate the height of a grid using purely XAML? I looked at this tutorial[url]...
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Dec 8, 2010
I have a data source:
[Code]....
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Feb 4, 2012
How can I implement both of these ObservableCollections in my xaml? I want to have a listview with all my students, and another listview with all my teachers.For now I just made an example student and teacher object. Am I going about this the wrong way. Eventually I will pulling from a datatable, not sure how I would implement it to the ObservableCollection though.
Public Class PersonalViewModel
Public Sub New()
Dim obcollection1 As New ObservableCollection(Of Student)
[Code].....
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Jul 26, 2009
I'm doing a WPF project and decided to try it out with Visual Basic. So, basically I'm trying to set the height of a row in a Grid. I'm not great at programming but with C# I managed somehow to figure it out, without remembering how. It actually looks like an animation because when clicking the button, the height of one row smoothly goes down to 0. But I'm trying to even reach that property and I can't figure out the context. The row is called "AnimationRow" and I can reach that, but where do I set the height?
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May 14, 2011
Following is the code I wrote for generating treeview hierarchy,
For Each k As KeyValuePair(Of String, GenreSet) In GenreSetDictionary
Dim t As New TreeNodeSet
t.Genre = True
[code]....
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Oct 7, 2009
I am new to WPF and XAML. I want to learn these for use in VB express 2008.Please guide me for some tutorials to start and progress in WPF and XAML.
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Feb 18, 2010
I've currently created the class below. For some reason though I can't access the properties I've created through my xaml style.
Public Class Ribbon : Inherits Button
Private mpopDropdown As Popup
Public Property Dropdown() As Popup
[Code].....
but they don't seem to expose the property either. I've also tagged the property as <Bindable(True)> but that didn't seem to do anything.
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Jan 18, 2012
Look at this simple bug :
<textblock (...) Width="0" />
Working great, the textBox appears to be 0px thin. Works with value like, 2, 3, 4...
Now that is NOT working :
<TextBlock (...) />
<TextBlock.Width>
<MultiBinding Converter="{StaticResource WidthConverter}">
[CODE]..................
Why can i set zero value to TextBox.Width in xaml and not in code behind ? By using a converter, when returing 0, the TextBlock.Width is not set to 0 but to "auto", i can read the text
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Sep 14, 2011
I want to bind data to an objectdataprovider.[code]...
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