VS 2005 Data Relations And Computed Columns?
Sep 8, 2009
OK, folks, help me figure out what I'm doing wrong. I have the following
Dim table1 As New DataTable("Table1")
table1.Columns.Add("column1", GetType(Integer))
table1.Columns.Add("column2", GetType(String))
table1.Columns.Add("column3", GetType(String))
table1.Columns.Add("column4", GetType(Integer))
[Code]...
table1.Columns.Add("column7", GetType(String), "parent(Relation1).column6")On the last line where I try to add column7 I get an error saying "unable to find parent relation 'Relation1'". I thought I just added that relation?
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Aug 25, 2011
I'm trying to add a computed column to a datatable that references another column in the datatable. Sometimes the computed column has a mathematical operation applied to it, but in this case I'm just referencing the original column. The code looks like the following:
ReportData.Columns.Add("1_1_US", _
GetType(Single), _
"1_1")
The code isn't actually hard coded as shown above - there are functions that return the values for the first and third parameters - but I checked those and they are returning the expected values and not generating any errors themselves.
The error is thrown when the .Add method is called, and the error states "Syntax error: Missing operand after '_1' operator." It seems to me that it doesn't like the column name, which I suppose I could change and just workaround it at the presentation level. Still, I'm curious. Is this a bug in the .net framework or something? It doesn't mind "1_1" as a column name in the datatable, so why is it having a problem with it in the expression statement?
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Apr 9, 2012
Question is the title itself. I was asked to use computed columns in SQL Server. But when I searched about it in Google, I found it was mainly for displaying the combined values of more than one coloumn. And usage of this may reduce performance if it is treated as a permanent coloumn. So I like to know
Advantages and disadvantages When and where we need to implement this. how can I achieve a solution for the below problem, if possible (with Compute columns. If not possible why?). Or any other way to implement this requirement. My requirement is to use a colomn which will identify which coloumn of that table was updated.So I can compare the values and identify the changes.
[Code]...
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Jul 25, 2011
I have a Dataset with a Bunch of Columns used in a Report (DevExpress XtraReports) (DataSet being the DataSource). The Dataset has many columns, and i need to read a column (based on the row type), and decide which column value to read for the row, and apply formatting based on the row type.
[Code]...
Is there a suggested way to handle this in the Report or at DataSet Level (excepting the formatting part)?
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Sep 16, 2009
I'm trying to generate my own dataset and create parent/child relation on the fly so that the subsequent datagridviews (dgv) that will be displaying the information will filter each child dgv by the record chosen in the parent dgv (I hope this makes sense).
So far I am able to display info in each dgv, but every record from each corresponding table is displayed in each dgv- no filtering is occuring. I think the problem might be in how I'm creating the relation and/or how I'm linking it to the dgv. Here's the code I have on the UI:
[Code]...
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Oct 26, 2011
I'm using VB.net 2005. I have working programs that I populate DataGridViews with something like the following:
[Code]...
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Oct 15, 2009
I have created this table using sql but I need to create a relation with another table and I don't know how.
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Aug 15, 2010
I have two list boxes named lb1 and lb2. Those list boxes have following items.
Lb1 Lb2
---- ----
2 4
3 5
[code]....
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Apr 21, 2012
PLATFORM VERSION INFO
Windows : 5.1.2600.131072 (Win32NT)
Common Language Runtime : 2.0.50727.1433
[code]....
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Feb 20, 2010
Lets assume that I have 2 tables:
First one is customer table and has primary key called cusid ( auto increment)
Second one is order table and has foreign key custid
How I can connect them, what I mean exactly when insert the record in the customer table I need the foreign key get the same value as primary key in customer table. I'm using sql server 2008 and vb.net 2008.
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Dec 23, 2008
Does anyone know how to rectify this problem,
ClickOnce Deployment Issue - File Has Different Computed Hash Than Specified In Manifest - Urgent! : ClickOnce and Setup & Deployment Projects : Windows Forms : MSDN Forums
ERROR DETAILS
Following errors were detected during this operation.
[12/22/2008 9:14:26 AM] System.Deployment.Application.InvalidDeploymentExc eption (HashValidation)
- File, NonFormEntryWindow.exe, has a different computed hash than specified in manifest.
- Source: System.Deployment
- Stack trace:
at System.Deployment.Application.ComponentVerifier.Ve rifyFileHash(String filePath, Hash hash)
at System.Deployment.Application.ComponentVerifier.Ve rifyFileHash(String filePath, HashCollection hashCollection)
[CODE]...
COMPONENT STORE TRANSACTION DETAILS: No transaction information is available.
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Jun 22, 2010
I haven't lost my mind? I have done relationships in the past but now they don't seem to work. Have I gone dumb? Creating a winform, using VS2008, sqlexpress & vb.net. My dataset looks like this:
[Code]...
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Feb 25, 2009
When i have a relation between two entities in my model: [GroupMember] (*) ----- (1) [User] and tries to select items from this relation with LINQ: From entity in _user.GroupMember select entity I always get an empty result unless I load the relation first with following statement: _user.GroupMember.Load() Is there a way to avoid loading the relations like this?
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Jan 6, 2011
i have 2 forms lets say form1 and form2, i already connected the ms access to my vb 2008 and im sure that i connect it right. The problems are for example i have this in my ms access table
[Code]...
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Aug 27, 2011
i got two columns in mysql 2005 Grade and Remarks i need to do is.. when i input integers in grade column 1,1.25,1.50,1.75,2,2.25,2.50,2.75,3 then Remarks will show PASSED and when Grade is 4 up remarks will show FAILED(OPTIONAL)if Grade is null then Remarks will show UNKOWN this is my code but it doesnt works on sql computed column formula IIF(Grade >=4, 'Failed', IIF(Grade IN (1,1.25,1.50,1.75,2,2.25,2.50,2.75,3), 'PASSED','UNKNOWN'))
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Nov 4, 2010
I'm have trouble summing a datagridview computed column. I can sum other columns in the DGV. Is it possible to sum a DGV computed column and have the result shown in a textbox elsewhere on the form? I have BindingSource with an End Date Column and a DaysLate computed by column. The calculation is in code and works fine. I now need a total days Late TextBox under the DGV days late column
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Mar 3, 2009
What is an efficient way (must be performed in a loop quite often) for getting the difference between two timestamps that come in form of DateTime-variables?
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Aug 6, 2010
How to bound this dataset to datagridview?
[Code]...
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Jan 16, 2012
i need the max ,min, avarage, for the 24 lines that lines counted from the line that contain the max date so i get the code for the max date for in the txt file this code used for both if txt file sorted by Ascending or by Descending
Imports System.Collections.Generic
Imports System.ComponentModel
Imports System.Data
Imports System.Drawing
[code]....
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Jun 15, 2010
I will be developing a Windows Application that will write data to an excel file.I would like to know if formulas used in the computed cols will still work on the new rows that I add or edit through program.
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Feb 20, 2010
Have a good day lets assume that i have 2 tables First one is customer table and has primery key called cusid ( auto increment)second one is order table and has foregion key custid how i can connect them , what i mean exactly when insert the record in the customer table i need the foregion key get the same value as primery key in customer table
Note : I'm using sql server 2008 and vb.net 2008
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Oct 1, 2011
I'm currently working on my listview, I have got three columns in my listview and I want to add the items in each column, but I don't know how to do this.
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Dec 4, 2010
Is it possible to add tow columns to two datables at same time I am currently using With Table1 add.columns etc....
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Sep 25, 2011
I'm working on a program that allows me to edit XML data in a DataGridView. I have most everything working but I don't like my current TreeView Structure. I load the XML data into a DataSet and edit it there, so that is what I'd prefer to base my TreeView on. I've tried a few things such as..
[Code]...
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Mar 23, 2010
I have a problem in this Routine(VB2008) :
Dim PubAry(2) As Object
Dim cc(2) As Double
cc(0) = 3.0 : cc(1) = 33.0 : cc(2) = 333.0
PubAry(0) = cc
[CODE]...
The result is:
- pubAry {Length=3} Object()
- (0) {System.Array} Object
- Double() {System.Array} Object
(0) 4.0 Double
(1) 44.0 Double
(2) 444.0 Double
- (1) {System.Array} Object
[CODE]...
Its like Excel Sheet Cells Relations !... Why?
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Feb 15, 2012
how can i insert data from data base with selected Datagridview columns i have insert combobox to Datagridview and it can load data from DB now i need insert data to another columns in Datagridview when i change combobox items?
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Feb 9, 2011
I am trying to read and save data into a access Database but using the rows and colunms valeu can
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Oct 25, 2009
I have a DatagridView with 12 columns. I would like to insert 3 Columns AFTER it has been filled with data from the table.The first New column should contain the total of Col1, Col2, Col3.The second new column should contain the total of the (old) Col4, Col5 , Col6...
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Aug 20, 2009
how to print, and got it working pretty well. The text string I have printing into a rectangle, and if a word does not fit it will wrap down to the next line, and then keep going like that, but now I need to split my page into three different areas that will each print different text.I am pretty sure I could draw three different rectangels then draw the text I need on each of them, but is it possible to somehow merge them together into a single rectangle that will be printed?
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Sep 23, 2010
I have a datagridview that is bound to a datatable. When the form is displayed, the column headers have no sort glyphs and the columns will not sort.
I don't see a property on the form that controls column sorting - at least not one that's obvious. This is an area of the code that another developer wrote originally, so maybe there's something going on that I'm not aware of.
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