I have an application that uses bound controls on the form. I have a dataset associated with my form and have a custom query written for one of my tables that is supposed to get two fields in the database and order them by their ID in descending order. However, when I run the program, the bound controls do not contain the last record, but the first.
View 8 RepliesAm devloping an application with multiple forms, which reside on top of a main form. i.e the main application window. The 'child' forms do not need to be linked in any way as they do not pass information to the parent form, as all the parent form does is act as main window.Now I would like to know what is the correct way for the 'main window' form acting as a container for the other forms? So that all the smaller secondary forms stay focused on top of the main application form, that when the main window is minimized, so these forms should do also etc..
I have read other posts and they mention, leaving all the forms standard i.e. IsMdiContainer = False and then using form.showDialog() to call the secondary forms. This did not work for me as what happens is that as soon as I give focus to the main app form, the secondary form disappears underneath.I tired making the main app form IsMdiContainer = True and when it loads calling:
frmMemberForm.MdiParent = Me
Now this works, because I can click off the form and minimize the app etc and the frmMemberForm doesn't disappear. However if i close the MemberForm and reopen it, it looses this property and once again when it looses focus, it will disappear.
How does one complete this query in a Dataset(VB.NET)?
Declare @Username as varchar(20), @Address as Varchar(20)
Select @Username=Username, @Address=Address
from EmployeeDB.EmpInfo
Where ID = 1
How do you query a Dataset with SQL queries? I'm using VB with Visual Studio 2005. I've got a large library of SQL queries I'd like to run in-memory on a Dataset.All the examples in the documentation show how to "query a dataset with code," but none show how to run a simple SQL query against a dataset. I've seen other threads that say you can do so, but no code examples. Can anyone provide sample code to show how you would run a simple SQL "Select..." query (using the same syntax you would use to query a database) on an in-memory dataset?
View 3 RepliesI have created a query in the DataSet Designer and now I would like to run this in a code to get the result of the query. Its just number which I get back and with this number I would like to continue working in the code.I know when I have a field connected with the Data sources I can launch it like this:Me.ProduccionTableAdapter.DowntimeHorasTrabajadas(Me.SHFDataSet.Produccion, datefrom:=DateTimePicker_From.Text, dateto:= DateTimePicker_ To.Text)but how do I do this when I dont wanna associate it with a text field and I just want to get the value into a variable?
View 1 RepliesI have access Query have more than one table. I want to insert into it. I cannot insert into it by CommandBuilder coz CommandBuilder for one table only so how can I do that using DataAdapter with dataset.
View 6 RepliesThe SQL string won't return data from Access. I've tested this exact SQL String in Access and it works fine.First of all, Am I getting a SQL query from Access in the proper manner?Second... should I be using a stored procedure for this? Or is making a query from tables like this a good practice? Third, if I'm doing it right, why won't Access query return and fill my dataset?These are the results I'm getting.
Connection State = 1
Tables in Dataset = 0
Where am I going wrong?
SQL:
SELECT PageSetupData.Size, PageSetupData.Category,
PrinterList.Location, PageSetupData.isPlotter, PrinterList.LocationSuffix,
PaperSizeData.PrinterName, PrinterList.HasAltPrinter, PageSetupData.SetupTitle,
[code]....
I have a data table in my dataset which was created with the following script.[code]
View 6 RepliesI've written a bunch of queries that bring back a set of results that look like the following. I have a user level column in an employees table which I'm trying to pull the value from. Only one result (number) will ever be returned. For instance the query will be like: Select username, userlevel from employees where username = "joe" So i'd be bringing back just the level, say 7.
[Code]...
I have a dataset called Me.VelocipedeDBDataSet and there is a table within the dataset called Contact.How can i check the contact table and output the results of rows which have a value for an attribute called AccntRep that matches a global variable known as repNo
I had though that the solution may be something like
If Me.VelocipedeDBDataSet.Contact.Rows.Contains(repNo) Then
Panel3.Visible = True
MsgBox("Account Rep Found", MsgBoxStyle.OkOnly, "Account Rep")
End If
but it has not worked,
I query on the data bank with Ado, put everything in a Dataset, changes the data and then lets it write in the table. How can it be that is written in all lines except the first one? I do not find any error. Someone can help me? Here the code:
[Code]...
I added queries to my dataset via the designer. Is there a way to use variables in those queries?
View 1 RepliesI have a problem with an MD5-hash algorythm that's acting very oddly.Here's the
vbcode
Imports System.Security.Cryptography
Imports System.Text
[code].....
how to pass a parameter to a predefined parameter in a dataset. I've found everywhere a solution if you build the sqldata adapter and the dataset in the code. Then you can pass the parameter like: da.SelectCommand.Parameters.Add("@param1", SqlDbType.Char).Value = param1_variable (as example)
But if you have builded a dataset (with table adapters), and then in the form app you want just to pass the param1 to a DataGridView1 (as example) which is using the table adapter, I did not find how to do this.
I don't have the same problem when using an untyped dataset.
OK. I have a typed dataset MyDS with a typed datatable MyTable (TableID, Title, Message).
The table gets filled with results from two tables, using a UNION ALL
Select
TableAID,
TableATitle,
[Code]....
Is this how typed datasets handles UNION? I didn't want to create two typed datatables and create separate SQL for each and create a relation.
I have a dataset column that I am keeping comments in. If the row has no comment in it(defualt string value is "", not NULL), I don't want it to show up on my report. How can I fill only the datarows that have text in them and not the ones that are empty. I've tried to filter the columns results by Not Nothing, but everything shows up. I'm guessing because it's actually not NULL since the string is "". How can I filter these results correctly?
View 2 RepliesI have created a DataSet.Within the dataset I have 2 DataTables.I have created a DataSet.Relations between the two tables.Now, using DataSet.DataTables.Select.... Would it be possible to perform a search similar to this in SQL?
SELECT * FROM DataTable1
INNER JOIN DataTable2
ON DataTable1.KeyColumn= DataTable2.KeyColumn
[code].....
I stumbled upon something i don't quite see the logic of. Let's ork with following piece of code:
For Each ds As DerivedScale In List
If ds.ScaleID = scaleId Then
ds.ScaleID = ds.ScaleID + scaleStep
[Code].....
This piece is written for 2 records to change place and change the sequence number (scaleid). The arrow indicates where the issue occurs. The item "ds" is replaced by the object 1 indexnumber higher/lower. This does however not effect that object in the List. So when i check, item ds isn't set.
However, when i look at ds.ScaleId = ds.ScaleID + scaleStep, this is reflected in the List.
So what I am wondering is: is "ds" acting like a local variable here, and can i only make changes to it's properties?
I have a bit of a strange problem with MySQL that I've never seen before. Basically, I need to enter the same entry into a table x number of times. The Primary Key is auto increment so there shouldn't be any duplicate value problems. However, it takes the last few columns and seems to clump them all into one value and is using that as a key. The error I'm getting back is:Duplicate entry '80-0--2011-06-16-0-1' for key 'idx_mtind you, there is no field called idx_mt. The primary key field is called just ID. And that 80-0--2011-06-16-0-1 is the last 8 columns or so (which you can see the names of in the cols variable) concatenated, which they obviously shouldn't be doing. Also, the first time the loop runs through, the entry goes through, but the later ones conflict with it. I confirmed that this is the problem by changing one of the last 8 columns to a value based on a loop, and that went through with no problems.
Dim cols As String = ""
Dim msi As System.Globalization.DateTimeFormatInfo = New System.Globalization.DateTimeFormatInfo()
[code]...
I'm wondering if its possible to change the query that grabs the data from the dataset at runtime, in order to produce a report based on different criteria.My project doesnt use dataset, and I've had to make one purely for the reports I'm currently using the mySQL .net connector calling everything via code, as well as the query I want to make at the time.Also, I don't want the report to be embedded in the application but be a seperate file as the report may change frequently (the layout of it)I've tried setting the build action as none, but I just get an error in the intermediate window.
View 1 RepliesThis is how I update a table using DataAdapter and DataSet in VB using SQL Server[code]...
I know that the Fill method does not make sense in case of an INSERT statement, but I am new to this technology and the above statement does the job and updates the table w/o problems. My question is this: If there was an error (say a duplicate key error) how would I know this in my application? Should I be putting the above code in a try/catch block?
Also, if there is a "proper" method for running INSERT statements using a DataAdapter/DataSet combination that does not use the Fill method, please indicate that as well.
I create a dataset and configure the query builder and in the filter i key in this "?" and when I search the name by enter the full name it will show but what I want is just type "A" and it will show the whole name starting with A. I stuck in this problem what the code to do in order to type just 1 letter and show the whole name starting with first letter that I want.
View 9 RepliesHow to Query multiple tables in a dataset to form single consolidated table without using any external database. I know this can be done using 'JOIN' in SQl.
Now my condition is I have multiple tables filled with data in a dataset and each table is interrelated with a common 'column'. For example ,
Table 1
ID
Name
1
[Code].....
Here I mentioned only two tables but in my case there are many tables. I need a generic answer for this dynamic query .
i have a dataset that filled by this query :
SELECT Invoices.ID, Invoices.invoicenu, Invoices.pdate, InvoiceList.icaption, Invoices.icaptioncode, Invoices.ccode, Invoices.postedbill, Invoices.billnumber, SUM(InvoicesDetaile.price)
AS Tprice
FROM InvoiceList INNER JOIN
[code]....
a datagridview is showing dataset data and user check checkedcolumn of datagridview (postedbill filed) and after user mark a few rows , i want update (invoice table) in database .
I am trying to call a SELECT query (with parameters) in Access from VB.Net 2008. I am able to call queries without parameters using the code below. The problems are (1) how to apply the parameters to procName and (2) how to get a dataset returned. I have looked around the net for hours and have found some examples. However, they are all for ms access action (update, delete, etc) queries using ExecuteNonQuery which does not return a dataset.
[Code]...
part 2 of 2: i was just wondering, is anyone else experiencing problems with their webbrowser, as in not displaying the right side links properly, and the reply, always sends you to an off screen, with no edit options, or being able to insert code in. this is currently happening in my firefox browser, although the i.e.8 has no problems... just want to know, to see if maybe it is a bug with my firefox, or they are again, updating the forum.
[Code]...
I'm trying to add items to the listview, but ever time i add a icon the Listview freezeslinks a white color for a millisecond.A millisecond is not a lot, but when you add 5 items per second to the listview then all you see is a white shade blinking. I tried slowing the thread down so it takes longer for it add the items still no luck.
View 5 RepliesI have an issue with calculating a total from my dataset. For some reason the number of plates produced on the StartDate is not being added to the TotalPlates in my program.Here is my query and calculation of total plates produced:
Dim Plates_Query As String = _
"SELECT *" & _
"FROM [PlateHistory_Query] WHERE (PlateDate) BETWEEN #Start# AND #End#"
[code]....
I used the query designer to create a qry from a datagrid view in vb2010 express, the idea was to work out which diver logged the most minutes in the water. here is a copy of the sql syntax:
SELECT MemberID, Name, SUM(DiveTime1) AS D1, SUM(DiveTime2) AS D2, SUM(DiveTime1 + DiveTime2) AS s1
FROM Triplog
GROUP BY MemberID, Name
ORDER BY s1 DESC
Will the elements in myList always be visited in the same order with a For Each loop (assuming I don't alter the list)?
Dim myList As New List(Of MyElement)
....
For Each myElem As MyElement In myList
' yadda yadda yadda
Next