I am populating a collection from some tables in the database which serves as a look-up from controls (combobox) I am using but what I want is rather than hitting the database each time can I just cache the collection and get the collection from the cache? The look-up table may or may not change all the time so I would want to have a way to validate if the cached collection is still valid or not.
View 2 RepliesI have a database that has tables in it. Tables can be added to this databse programatically as well as the data that needs to be in those tables.I need to be able to query that database to get what tables are in it, place the names of those tables into a listbox so that when a user clicks on the name of the table, It will update a DataGridview with the data that is in that table in the database.I assume that you would need to build a dataset at runtime based off of what tables are in the DB, but i have no idea how to do this.
View 2 RepliesI dont know how to dynamically populate a dataset based off the tables in an existing database.Once I can get the dataset to populate, I can then move forward with the next step of the project.
View 1 RepliesI need to populate values from a database(Access) in to vb.net form. after selecting a field from first form, the next form should display all the parameters used in the selected field from the data base. Also if do editing it should be updated in the database.
View 4 RepliesDim A As Collection
Set A = New Collection
Dim Arr2(15, 5)
[Code].....
How can I access the Arr2 through A? For example, I want to do the following:
A.Item(1) (1,1) = 15
so the above would change the first element of the first two-dimensional array inside the collection...
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.
I am creating a glossary of words used in a study course. I would like to populate listbox with words entered into an imputbox.
View 8 RepliesI have got a database with a bunch of tables in it. So far, i can query that database and get the names of all the tables into a listbox. this is sweet.
What i need to do now is to enable the user to click on a table name thats listed in the listbox (which were put there using the
GetOleDbSchemaTable method)
and when they do, i need to populate the Datagridview with the relevant data thats sitting in the table that is listed in the listbox.
I've tried a couple things to get the tables themselves to populate the DGV(which kind of works now), but not the Data thats sitting in the individual table.
I'm trying to populate an Access Data Table (5 columns) with a Visual Studio front end, but I'm not clear on how to pass the data through the parameters. I have created a connection, a data adapter, and a data set in the project by dragging them onto the form. I know the connection works because I can see my Access database using the Server Explorer. I have an INSERT command in the data adapter and the parameters are represented in this command with question marks. See my insert command below INSERT INTO tbl_ConstraintLogs (ConstrinatChangeReason, ConstraintTagName, ConstraintValueBefore, ConstraintValueAfter, onstraintTimeChange) VALUES The values that I want to pass to the database are coming from text boxes or they are program generated. For example: If I have a variable in my program called "AbcValue", how do I get the value of this variable into the database as the first parameter. I was trying to use the "Fill" command, but I'm at a loss here.
View 2 RepliesI am about to commence coding (actually recoding) on a project that accesses 100 tables of a database, more to added at later time. About half of the accesses are queries with joins and unions. I am more of a coder to not use wizards such tableAdapter, but code more by other methods. I have read some post of this site that suggest avoiding tableAdapters, not to use them in an Enterprise environmentl, but no reasons. I would like to hear from willing to bend my ear, pro or con.
View 1 RepliesI am trying to create a basic quoting tool but got stuck on how to clear and change the item collection from within a combobox for a datagrid.What we have is a list of 4 columns like a. Device b.TypeofService c.State d.Price Inside a sql database. Data is also structure like above as well.
I have a datagridview where the user will populate a,b,c and the price will be display and a total at the end. However a,b, and c aren't related in my current application. The combobox will show all possible dinstinct values for each column.
This works fine but I want to refine the application to only show the values of b. which are in the database after the user select the value for a. I have tried searching on how to do this as I assume to the Contry/State/City situation but could not find anything for a datagridview control in VB.NET.
Can anyone point me in the right direction? If I cannot do this dynamically from within a datagridview I was thinking of maybe creating three combo box outside and having it populating the datagridview afterwards but it wouldn't be as nice.
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?
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:.....................
I am populating excel from a data grid view. Everything works fine except that header does not show in excel (just details).
Dim wapp As Microsoft.Office.Interop.Excel.Application
Dim wsheet As Microsoft.Office.Interop.Excel.Worksheet
Dim wbook As Microsoft.Office.Interop.Excel.Workbook
wapp = New Microsoft.Office.Interop.Excel.Application
wapp.Visible = True
[Code] .....
Private ReadOnly Property Values() As Decimal()
Get
Dim X As Integer = 1
[Code]....
{"An error occurred creating the form. See Exception.InnerException for details. The error is: At least one element in the source array could not be cast down to the destination array type."}
I made a quick search but couldn't find any help I need to put the values of a checklist box into an array. I've found several solutions on the internet but all of these don't seem to work for integer arrays. This is what I've got so far
" Dim RemoveValues(checklistRemoveBrew.CheckedItems.Count - 1) As Integer
Dim C As Integer
For C = 0 To checklistRemoveBrew.CheckedItems.Count - 1
RemoveValues(C) = checklistRemoveBrew.CheckedItems(C)
Next "
Does anyone know if there is a way of populating a treeview from active directory so that it can do the following:Loads a list of servers --> Double Click the Server(Expand) --> Then i can select users --> then the department they are in --> then select the user so i can manage the user. i.e change there password[code]
View 1 Repliesthis is how I set up my data object for a file parser. (
Dim mytable As New List(Of String(,))()
mytable.Add(New String(4, 16) {})
and it loads mytable like this:
mytable(x)(y, i) = sToken(i)
Let me explain the indices, I have a form with a tab control. In mytable,x is the tab number. Each tab has up to 5 groups which is y. Each group has 17 text boxes, i.Each group also has 17 labels.I started looking at Me.controls, and looking at control properties like tabindex for some way to iterate through the textboxes and mytable to load the textboxes.
so I started with:
for x = 0 to 31
msgbox(group1.control(x).text
next x
and I saw how all my objects are not in sequence as it descending halfway through my label controls, then switched to my textboxes, and then seemingly finished randomly. I am at a total loss without the old index property and what I want to do is something like (forgive my syntax)
Form(0).Tab(x).group(y).textbox(i).text = mytable(x)(y, i)
I was thinking of manually setting the tabindex of all textboxes in group1 to sequential order to try something like:
group1.component.tabindex(i).text = mytable(x)(y, i)
To me this is fun and challenging, but also very frustrating and makes me miss coding in assembly As I can't seem to find any reference to the tree structure of accessing components indirectly, if that makes sense.
I am getting an overflow somewhere while populating my database.The number of records inserted is different every time I get the error and I have been unable to trace where it is coming from.
View 7 RepliesSo i have some data in an 1 dimensional array, is it possible to dump this data into a database?
View 4 RepliesI am trying to populate listview with the code below:
Public constr As String = "Data Source=adesina-pc;Initial Catalog=AdventureWorks;Integrated Security=True"
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs)
[code]....
how to populate my listview using database.
View 2 RepliesI am populating a datagridview with information from a database. One of the columns is a monetary amount. Right now my datagridview columns just show a double.
View 2 RepliesI want to create a 2 dimensional array and populate it with data from database. I wrote this following code.I made some mistakes here with the arrays.
[Code]...
I have a few drop down lists that I'd like to populate from a table in an SQL database. I tried setting it in the DataBindings section of Properties but I guess that doesn't work.
View 11 Repliesif this question has already been answered many times, but I am new to VB and I don't really understand any of the examples I have found by trying to research this topic. I am using VB 2008 Express Edition. My List View is called listView.
View 4 RepliesI am populating a combobox with a list of names that are coming from a database. I would like to get the names to show up in the combo box in alphabetical order. [code] There is also another combobox I'm populating with text from a database. (as below). However, in the database, in the column I'm reading data from, there are a few duplicate rows and then when the combobox is populated, the same text can be seen 2/3 times. What can I do or add to my existing code, that will ensure that there is no duplication shown in the combo box? [code]
View 3 RepliesThe vb.net code for populating tree view from the SQL Server Database is given in following link: [URL]I tried the code given in the above link to solve my problem but I was unable to change the code of SQL Sever for Postgres Database. I want to do the same thing using vb.net and database Postgres.
View 1 RepliesI have a field in an access database with decimals in it. I am using ADO to read in the data and are trying to assign it to a textbox in a form. This works fine when its a whole number. But it doesnt seem to work when its a decimal for some reason.
I have declared the variable i have assigned the access field to as a double, but when i set up a test textbox which i point the variable at and times it by 1000, it doesnt work. Works perfectly when i change the access field entry to a whole number though.
This sounds like im not using the right syntax or something.
i have imported names from database table into combobox..i want to add item"all" above all names..how can i just add one single item in combobox after populating it form database tabel.
View 1 Replies