I have a datagrid which is getting populated by two tables. I want to know how do i perform an update on these tables once the user tries to save any edited data. I am doing the following which i found in one of the articles online: [Code]
If objDataset.HasChanges()
Then Dim data_adapter As OleDbDataAdapter Dim command_builder As OleDbCommandBuilder fillSql = "Select [Price Info].[Product Quick Find ID] As
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I used INNER JOIN to bind the two tables and my problem is how to populate/show on the datagrid.[code]....
View 12 RepliesI have this query that I tried to join 2 tables together, one which holds the product name, and product numbers, and take a product number, and go to the other where to find a Art_no which is like the product number.[code]
View 2 RepliesI dont have a huge wealth of experince with SQL statements and im struggling;
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I would like to list all of the job titles(for which there could be multiples as different employees can have the same job title) in the employee table and find the maximum amount of hours for that job title as the hours could be different for different empoyees.
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I'm trying to use the Entity Framework to create a complex query and get stuck in the joins. After browsing some of the documentations, I cannot seem to find the correct solution, so maybe someone here can help.
I have a data structure where a family has several family members, each of which can have more than one entry in the income table (on different registration dates) and can have more than one entry in the healthconditions table.
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I have a set off LINQ queries filtering original datatable (loaded from Excel file) according to user selections in Comboboxes. Then the result is joined with Arraylist to further filter the set. Arraylist is a simple string list from 1 to 5. [Code]
View 3 RepliesI am using an Access database to store (filepaths to) pictures as well as comments people can leave on them. One picture can have multiple comments, so the tables look like this:
_____________ _____________
|Photos | |Comments |
|------------| |-------------|
|Id (PK) | |Id (PK) |
|PhotoPath | |PhotoId (FK) |
|Description | |Comment |
|____________| |_____________|
What I need to do now is retrieve a list of all Photos along with their Comments. So I have a class Photo with a collection of Comments:
vb.net
Public Class Photo
Public Property Id As Integer
Public Property PhotoPath As String
Public Property Description As String
Public Property Comments As List(Of Comment) End Class Public Class Comment
Public Property Id As Integer
Public Property PhotoId As Integer
Public Property Comment As String
End Class
I can retrieve the records using an INNER JOIN query (right?), as such;
SELECT Photos.*, Comments.*
FROM (Photos INNER JOIN Comments ON Photos.Id = Comments.PhotoId)
From the result of that, for each row in the result I can create a new Photo instance, set its properties and put it in a List(Of Photo) for further processing (displaying). However, how do I handle the Comments? With this query I would get a lot of duplicate Photos. I'd get a row for each comment, but most of these rows will represent the same photos... How do I handle this the best way? I have used inner join queries before, but only for a one-to-one relationship so I never had this problem before. Now when I finally need a one-to-many relationship I realize I've no idea how to handle this appropriately...
There must be some standard way of handling this? When I previously handled cases like this I didn't use an inner join, I just retrieved all Photos first, then iterate through them and run another query to retrieve the Comments that belong to that Photo (SELECT * FROM Comments WHERE PhotoId = ?). That works fine, but when the tables are getting larger it is getting noticeably slower. So I want to do it in a single query, I definitely want to avoid running hundreds of queries if I can.
I've looked all around and spent way to long trying to convert this SQL statement into a Linq statement in VB. I'm sure it would be a good example for others out there - the statement is trying to pull products that have a many-to-many relationship with product categories, and the categories have a hierarchy of parents/children.
Here is the query I am trying to convert:
SELECT P.ProductID, P.ProductName, P.ProductSlug, P.PartNumber
FROM Products AS P
INNER JOIN Products_Categories AS PC ON PC.ProductID = P.ProductID
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I can get up to the point where I am trying to say "WHERE ... (P_Cats.Parent = 9)" but can't figure that part out.
Given a table like
ID | Name | City
1 | X | Y
2 | Z | Y
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How 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
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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 set of LINQ queries filtering original datatable (loaded from Excel file) based on user selections in Comboboxes. Then the result is joined with Arraylist to further filter the set. Arraylist is a simple list of strings.
Query:
If (Samples.Item(0) Is Nothing) = False And Samples.Item(0) <> "All samples" Then
queryResults = From records In queryResults Join samp In Samples _
On records("SAMPNUM") Equals samp _
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How to JOIN tables on nullable columns? I have following LINQ-query, RMA.fiCharge can be NULL:
Dim query = From charge In Services.dsERP.ERP_Charge _
Join rma In Services.dsRMA.RMA _
On charge.idCharge Equals rma.fiCharge _
Where rma.IMEI = imei
Select charge.idCharge
I get a "Conversion from type 'DBNull' to type 'Integer' is not valid" in query.ToArray():
Dim filter = _
String.Format(Services.dsERP.ERP_Charge.idChargeColumn.ColumnName & " IN({0})", String.Join(",", query.ToArray))
So I could append a WHERE RMA.fiCharge IS NOT NULL in the query. But how to do that in LINQ or is there another option?
The problem was that the DataSet does not support Nullable-Types but generates an InvalidCastException if you query any NULL-Values on an integer-column. The modified LINQ-query from dahlbyk works with little modification. The DataSet generates a boolean-property for every column with AllowDbNull=True, in this case IsfiChargeNull.
Dim query = From charge In Services.dsERP.ERP_Charge _
Join rma In (From rma In Services.dsRMA.RMA _
Where Not rma.IsfiChargeNull
Select rma)
On charge.idCharge Equals rma.fiCharge _
Where rma.IMEI = imei
Select charge.idCharge
I'm working on an ASP.NET 4.0 site, which I inherited ownership of. It has a number of existing LINQ datasources pointing to individual tables. For example, to the Patient Encounter Summary table in SQL Server. The problem is in displaying the data there. It's a normalized database, so that table contains (for example) the provider ID, rather than the provider name.
It's simple enough to join the Patient Counter Summary to the Providers table (in SQL)... but how does one do that in ASP.NET? I'm not sure of the correct nomenclature, but the 'mid layer' is VB.
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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
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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 .
What I am trying to do basically is open an access query in a datagrid view and then be able to make changes to the datagrid and then save it back to the database.When I try to save:
Me.BindingSource.EndEdit()
Me.TableAdapter.Update(DataSet)
It says that update is not a member of the tableadapter... Why is that?
I am creating a POS system, but there are a couple of things that I cannot get my sales form to do. It contains a datagrid view of the table containing columns code, description, Qty, total. After the code has been entered, I want it to load the description automatically. After the Quantity has been entered, I want it to give the total amount for that Item + the total amount for this order.
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I am a newbee to the programming. So please guide me if i am wrong. up to binding of the datasource my programe working perfect but during save button it gives error.(Value can not be null. Parameter name : daatTable)
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I'm having a database, using GridView I retrieve the data into my WEB application.Then I set the rows to editable (not sure if it is fully completed) and when I edit some cells I want to update the GridView AND the database behind.When I click on 'edit' then the button is changed to update. I get some unhandled exception. I don't expect anything else since I didn't put any code in the update methods like RowCommand, RowUpdating, RowUpdated, RowDataBound.
View 4 RepliesI have a datagrid that I use to display data from a SQL 2000 table. I am trying to write back any changes the user makes to the datagrid data back to the original table but don't know the proper method to do this.
Here is the code that populates the datagrid:
Dim TheDatabase As System.Data.SqlClient.SqlConnection
Dim ConnectionString As String
Dim cmd3 As New SqlCommand
Dim Adp3 As New SqlDataAdapter
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I could use some suggestions on how to code the write back command that will allow the user to change the data in the datagrid and have those changes be written back to my tAdjustment table.
I have a form with tabcontrols and datagrids in my accessfile I have 35 tables.I have set the datagrid to edit by enter and I use this code to update the tables:
View 7 RepliesI am currently stuck on a project where I am populating a datagrid from a series of labels and textboxes. I have that part down. Now for the part where I actually add it do the database, I am having a problem. It is actually adding everything to the database just like I want it but when it finishes adding the data from the datagridview, I am getting an error saying there are no values.
I have included the code I have been working with.
Private Sub btnsubmit_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnsubmit.Click
Dim I As Integer
For I = 0 To DataGridView1.Rows.Count - 1
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I have a working data grid on my form which pulls the courses the logged in user has signed up for from my database.
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However, i can't figure out how to do this:When a new course is added to the database, i need the data grid to 'refresh' or 'update', which will mean that the new course will show up in the grid automatically.
Currently, users have to restart the application in order for the new course to appear in the data grid.
I am using a Dim All_PriceLists As System.Collections.ObjectModel.ObservableCollection(Of BSPLib.PriceLists.PriceListPrime) where PriceListPrime implements Inotify for all properties in it.
I bound the All_PriceList to a datagrid as DataGrid1.ItemsSource = All_PriceLists but when I do All_PriceLists=Getall() where Getall reads and gets the data from the DB, the datagrid is not updating.[code
Not able to update the table in access using the below function
Private Sub btnUpdate_Click(ByVal sender As Object, ByVal e As EventArgs) Handles btnUpdate.Click
Dim cn As New OleDbConnection(Con)
Dim objUpdateCommand As New OleDbCommand
Dim objDataAdapter As New OleDbDataAdapter
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Im trying to update a datagrid and a text box value in access database. both shld be saved in the same row simultaneously, unfortunately its not happening. they were gettign saved in a different rows.
conn.Open()
sqlQRY = "Insert Into tblPlot(SurveyNo)"
sqlQRY = sqlQRY & "Values"
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I have a bound datagridview when a editing a datagridviewtextboxcolumn and the end edit is called I use the tableadaptermanger.updateall(dataset) to update the db. All well and dandy but having a problem with a comboboxcolumn. The db is only updated after I have selected a new value from the comboboxcolumn and click on another cell in the grid. If I dont click on another cell the db is not updated. I have tried this code but no good:
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How do I fire an event when changes are made in a datagrid embedded in my form? My datagrid houses line items for different forms (Sales Orders, Purchases Orders, etc.), and when a value is changed (i.e. quantity or price), I want it to re-calculate the datagrid automatically (extended amount) and also re-calculate totals in the form itself without having to hit the Save Button. Right now I have a sub-routine that fires when the button is chosen, but how do I fire this event automatically on datagrid changes?
View 7 RepliesI am trying to update a table based on row selected in a grid (C1TrueDBGrid1.Columns(1).Value), but I am getting the following error:
Update unable to find TableMapping['Table'] or Data Table 'Table'
Code:
Dim ConnectionString As String = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=/DataDirectory/AOPT2002org.mdb;Persist Security Info=True;Jet OLEDB:Database Password=testaopupdate" Dim objConnection As New
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"I've wrote a code that accesses data from MS SQL server in DATAGRIDVIEW in VB.NET.the problem is whenever i save the changes back to the database, changes are not reflected back
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I am using/creating a DataTable so the "enforceConstrains" property is not avilable for DataTable.Error message: Failed to enable constraints. One or more rows contain values violating non-null, unique, or foreign-key constraints.
Windows Form Load Event:
Private Sub Expenses_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
expensesGV.DataSource = listExpenses()
expensesGV.Columns(0).Visible = False
End Sub