Updating a datarow
For more information, see Merging Data Set Contents and Handling Data Adapter Events.
The following examples demonstrate how to perform updates to modified rows by explicitly setting the Private Sub Adapter Update(By Val connection String As String) Using connection As Sql Connection = New Sql Connection( _ connection String) Dim adapter As Sql Data Adapter = New Sql Data Adapter( _ "SELECT Category ID, Category Name FROM dbo. Update Command = New Sql Command( _ "UPDATE Categories SET Category Name = @Category Name " & _ "WHERE Category ID = @Category ID", connection) adapter.
A typical scenario is, say you have to loop through a Data Table rows and do some calculations on the rows and delete some rows depending on the condition.
Hi there, I am trying to update a Data Row but I cant figure out how to do it.
Parameters are mapped to the current row through the Source Column and Source Version properties of a . Source Column refers to a Data Table column that the Db Data Adapter references to obtain parameter values for the current row.
Source Column refers to the unmapped column name before any table mappings have been applied.
Fill(category Table) Dim category Row As Data Row = category Table.
Original Dim category Table As New Data Table adapter.
It should be noted that these statements are not performed as a batch process; each row is updated individually.
As of now, the application runs perfectly and does exactly what I need it to, but the problem comes in when a large data set is reviewed.
If I am pulling records for one day or even maybe a week, it runs at a decent pace, but once you get a month of data or more, it takes a fairly long amount of time. Is there possibly a better way that I can code this?
encounters a change to a Data Row, it uses the Insert Command, Update Command, or Delete Command to process the change. Rows(0) category Row("Category Name") = "New Beverages" adapter. Write Line("Rows after update.") Dim row As Data Row For Each row In category Table. Write Line(": ", row(0), row(1)) Next End Using End Sub either by returning the auto-increment value as an output parameter of a stored procedure and mapping that to a column in a table, by returning the auto-increment value in the first row of a result set returned by a stored procedure or SQL statement, or by using the are sent to the data source is important.
This allows you to maximize the performance of your ADO. For example, if a primary key value for an existing row is updated, and a new row has been added with the new primary key value as a foreign key, it is important to process the update before the insert. By specifying a subset of rows to be updated, you can control the order in which inserts, updates, and deletes are processed.
An application can call the Get Changes method in situations where you must control the sequence of statement types (for example, INSERTs before UPDATEs).