VS 2008 Use 'DataObjects' In A DataSet?
Feb 24, 2010
i have been working on an xml heavy application and have been extracting the xml via LINQ and populating predefined Dataobjects (defined directly from classes and added to Data Sources as type Object) now using this method i have lost a lot of functionality normally achieved with a database method (ability to sort dgv using the header columns for example) I tried adding a dataset to the project and discovered that i cannot simply drag these objects to the DataSet designer. i am considering going down the route of sql CE 3.5 but this would mean rewriting a large portion of my project and tbh i'm not sure how to add LINQ to sql compact (google comes up mainly with c# examples or how to get data from sql in linq form.Currently i have 4 Objects in my Data Sources panel and i wish to give some relational abilities to these objects.
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Mar 15, 2010
When the user clicks an "Edit" button on my form, I want a box to come up which allows the user to edit a DataTable in a strongly-typed DataSet. What's the best way to do this?
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Jan 28, 2010
I have code running in the Datatable.ColumnChanging event in my dataset. This dataset underlies a form and conventional drag/drop controls are in place for data entry.when the event triggers and runs, I am running code in the form that checks the dataset.HasChanges property. It is showing False. But this is immediately after the ColumnChanging event has been triggered.Okay, I see by others posts and MSDN that .HasChanges will only be true after moving off the row with the changed column. I have also noted lots of discussion about the advanced binding property of DataSourceUpdate Mode, but that does not address this issue.I guess I can do this by checking the state of the row for the binding source. Just seems odd that the event behind the dataset can be triggered and that does not change the dataset.HasChanges property.
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May 14, 2012
I have tried everything I can to get beyond this error which shows below as <<<<< error here. It is trying to fill a dataset from a data adapter. If I change the SELECT statement to just SELECT * FROM xTable I get the correct number of records in each table. But anytime I try with a more complex statement I get the error message shown below which indicates System.Data.Common.DbDataAdapter.Fill(DataSet dataSet. I've completely erased all data and entered a new set of test data so I know there is no problem with relationships. Each table has primary key which is foreign key in other table. IS there something wrong with the Imports section: Imports System
[Code]...
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Jul 20, 2009
I got this code to get the highest value from a dataset, but it now doesn't work properly. I think it only gives me the last row but not the highest value.
Dim adMaxRec As New SqlDataAdapter("select serviceid from service", nwindconn) 'where custid = '" & cutidtext & "'
Dim dsMaxRec As New DataSet
adMaxRec.Fill(dsMaxRec)
Dim maximumrecord As String
maximumrecord = dsMaxRec.Tables(0).Compute("Max(serviceid)", "")
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Jun 4, 2010
im addin a new row into a dataset Ipsauto from the MDB IPS
heres the code im using
vb.net
Dim cn As OleDbConnection
Dim cmd As OleDbCommand
Dim dr As OleDbDataReader
[Code].....
ignore the "addthis.Rows(0).Cells(16).Value" theyre values im using to insert to the tablle...i dont wanna use texboxes so im using a datagrid...and no i cant use the database bound to the one i want in a grid to add rows (got my reasons)...thats why i want to do it separetly...
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Jan 11, 2011
I have a XSD file and I must create an XML file with data,I read schema but dataset doesnt have any table(I debug code ),how do I get XSD file into dataset,I use this code :
vb.code
Dim wds As New DataSet
wds.ReadXmlSchema("C:myXMLschema.xsd")
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Jun 15, 2009
how to get the maximum value record on my dataset. I found this code (maximumRecord = myDataset.compute("Max(columnName)", "")) on google but this is not working with a dataset, it is suppose to work on a table, but I need to get the maximum value of a specific data that I put into a dataset.
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Jun 17, 2009
I'm new to both SQL Server Express and VB2008 Express or any other kind of language for that matter..I'm trying to create a form using a typed dataset created using the Data Source Configuration Wizard that contains two main tables and a third that creates a many to many relationship between the first two.Is this possible as when I examine the dataset in the Data Sources window, the middle table shows up as a related table under each of the main tables but neither shows a third related table.How can I show synced data from all three tables on my form. Is this possible using the Configuration Wizard or does it have to be done in code?
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May 10, 2011
I'm trying to create a form using a typed dataset created using the Data Source Configuration Wizard that contains two main tables and a third that creates a many to many relationship between the first two.
Is this possible as when I examine the dataset in the Data Sources window, the middle table shows up as a related table under each of the main tables but neither shows a third related table.How can I show synced data from all three tables on my form. Is this possible using the Configuration Wizard or does it have to be done in code?
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Apr 1, 2009
I have a client database, with a form which shows a full list of all my clients in a DataGridView. The Load Event of the form fills the dataset - which works fine.
Under the DataGridView I have a link to 'add a new client' which opens a new form and prompts the user for the new client's details. On clicking Save, it excecutes a SQL stored procedure to insert the new client directly into the SQL database. This also works fine.
On closing the 'Add new client' form, it returns to the form with the DataGrid (which was always visible). However, the DataGridView (populated from my DataSet) doesn't show the newly added client.
frmAccounts.TblClientsTableAdapter.ClearBeforeFill = True
frmAccounts.TblClientsTableAdapter.Fill(frmAccounts.DsClients.tblClients)
frmAccounts.TblClientsBindingSource1.Filter = "ActiveClient = 'True'"
frmAccounts.TblClientsBindingSource1.Sort = "Surname"
I made sure the call was being executed by sticking a MsgBox line in the procedure, so I know it runs - yet it doesn't update or refresh the DataSet.This is exactly the same code that is in the Form Load event, so why does it not work? If I close the main form and re-open it, it reloads the DataSet and shows the newly added record.I've also tried putting the code in other Events rather than Form Closing and still it does not work.
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Dec 31, 2009
I have all my data in a dataset but i'm wanting to show only some of this in a datagrid. I know I can open up "Search Criteria Builder" as shown in my image but how can I add a program virisable into this for example
SELECT ID, ShortName, LongName, Manufacturer FROM Aircraft WHERE FirstFlight > CurrentGameYear
And CurrentGameYear is a Public variable in my application.
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May 5, 2011
I have this application I developed whose bulk of code is designed around processing information and generating external files (most in MS Excel). Data is read from a variety of support documents (design drawings) and processed through some fairly complex algorithms. To support this processing stage there are a variety of settings saved in a DataSet saved as an xml document. At the time I thought it would be a nice "poor-man's" database and I wouldn't have to worry about a lot of overhead. Besides, there will never be more data than MS Access could handle, so Oracle and SQL Server would be a huge overkill. MS Access in itself almost is. The most records I'll probably have is a couple thousand. Unfortunately, the more records that are added, the slower it's write and read responses are getting. I'm not doing anything fancy. Literally using:
'Retrieve the Dataset and DataRelation object SettingsDS.ReadXml(FilePath, XmlReadMode.ReadSchema)and dsSettings.WriteXml(DSFilePath, XmlWriteMode.WriteSchema) The information in this xml includes the schema (data relations, table definitions, constraints, etc) and records.
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Nov 14, 2009
I have been stuck on this for the last 30 min, can't find out where I am going wrong. Its fully functional scrolling through records but I get an error when I try to update a record. The error is "Update requires a valid UpdateCommand when passed DataRow collection with modified rows." I include a pic of the code and error.
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Aug 24, 2010
i am trying to copy data from a standard Dataset to a Type Dataset (XSD) of same table structure. i want to use Automapper to do that one. So how can i do that using automapper?
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Jun 5, 2010
I need to pick all data in my application from my database and use it in my form
my question : how to pick all data in my application then i use it
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Jun 22, 2010
I have two Datagrids, One grid has all the customers garments on it with style number and contact length. The other grid has the users who have garment issued to them. the style number is in both grids. I need to loop through the users grid and say if the contract number is 1 from the first grid then the contract date on the second grid will be todays date + 365 days (year contract) I have looked at using a stored procedure and also a for each command but I am just getting stuck with it all. [Code]
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Jan 4, 2011
I have a problem saving a dataset which contains rows that i have imported from another dataset. i can successfully view the imported rows in a gridview but i cannot commit the rows back to the database.
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Jul 8, 2011
I would like to know where the dataset designer is obtained for a vb.net 2008 appliocation I need to work on. Is this part of the initial install for visual studio.net 2008. If so, what part of the initial install will I find the dataset designer? Is this a plugin that needs to be downloaded? if so, what URL do I need to use to obtain the plugin?
[Code]...
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Oct 8, 2009
I have a dataset which creates a table adapter to the table I need. I call a query on that table adapter which returns the number of fields returned. In this case it's one field and will always be one field.. I am filling a variable with that query.. however instead of the fields returned I need the actual data.
This is how my current code sits...
vb.net
Dim aUserName As String
'TODO: This line of code loads data into the 'DataSet1.IT_Staff' table. You can move, or remove it, as needed.
aUserName = Me.IT_StaffTableAdapter.FillByUsername(Me.DataSet1.IT_Staff, SystemInformation.UserName)
Do I have to load this into a variable declared as a datatable then somehow call the column and row 0's value? If so how?
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Feb 23, 2012
I have xml file and try to load into datagridview, how can I save the xml after I sort it by desc?
[Code]....
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Feb 22, 2011
Basically i have a form with a sqldataadapter and a dataset to retrieve and process data. from within the form i call another form which i use to retrieve data given some criteria which my user enter (on the secord form i also use a sqldataadapter and dataset.my problem is this: the use can select 1 or more records from the second form which he or she wants to process and the logic is to jump back to the first form and show only those records. note: the secord form (search data form) can display any number of records
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Oct 15, 2009
I need to cycle through a controls binded sources data.For instance I have a text box bound to a dataset, the datamember is a column in that tableadapter
I then would like to click a button that will show the next record.
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Dec 9, 2009
Once I have filled a dataset is there a set of properties or in-line functions that will allow me to pull the data out of said dataset without having to populate a datagrid?
Code example:
Connection.Open()
accCommand.CommandText = "SELECT CustID FROM Rental WHERE DvdID = " & DvdID
accCommand.Connection = Connection
dvdDataAdapter.SelectCommand = accCommand
accCommand.ExecuteNonQuery()
dvdDataAdapter.Fill(dvdDataSet, "CustID")
Connection.Close()
I know the information returned from the query is a single value located at (0, 0) I just can't get to it so I can assign the value to the variable.
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May 15, 2009
I am deleting a row from a row that is currently selected on a datagridview.I am using a Typed dataset and my datagridview is bounded to a binding source.However, I think my technique is not the best, even though it works.
Dim drDelete() As DataRow
' Get the value of the PK from the currently selected row
Dim drv As DataRowView = CType(bsAddressBook.Current, DataRowView)
[code]....
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Nov 18, 2009
I've been using VB for some time now, but I must admit I am a little confused. I started learning with 2002, then 2003, 2005 and now 2008. I think database coding must have been going through a kind of transition when I was trying to teach myself the basics. As a result, I am not entirely clear on a few things..
1) What's the difference between a DataTable and a DataSet. Why would I use one over the other?
2) Personally I dislike using DataAdapters etc and much prefer typing my connections in code so I can see what's what. When using the visual tools things are 'hidden' from view and it's not clear what's going on - do others find the same or is this just me being old fashioned?
3) Using my code-based approach (ie: creating SQL connection, using ExecuteNonQuery and a SQLDataReader to read the results into my application) - is this less efficient than the alternative methods?
4) Finally...LINQ. Is it any better and should I be using it as standard practice?
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Aug 1, 2011
i have a dataset and i want to create a textbox and a button that once you click on it it will search for the word in that textbox in the dataset, for example like in sql with the "LIKE %xxxx%" format.
here is an exapample:
Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
Dim dr As DataRow()
[Code].....
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Nov 20, 2009
At the moment when a user logs into my system it checks to see if a job exists, if so the records are put into a datagridview. However, if there are no jobs in the database I get an error.
[Code]...
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Jan 31, 2010
I want to load an xls file to dataset, edit the data, and import them in mysql.My problem is that I can't load the file. It seems like it ignores the file completely.
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmd1.Click
Dim MyConn As OleDbConnection
Dim myPath As String = "C:TempManinLottery2009.xls"
[code]....
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May 24, 2010
I have a form whith a DataGridView.When the DGV is double-clicked another form opens representing a single record. When this form updates back to the database and closes, how can I automatically refresh the DataSet in the original form containing the DataGridView? As it stands now the original form still contains the deleted record.I suppose handling the original form's Focus/Lost Focus events and refresh the DataSet might work, but is this route a bad idea?
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