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These values are generated by the server as rows are added to a table. Write Line("List All Rows:") Dim row As Data Row For Each row In categories. Write Line(": ", row(0), row(1)) Next End Using End Sub . Row Updated, New _ Sql Row Updated Event Handler(Address Of On Row Updated) ' Update the datasource with the modified records. Update(data Changes) ' Merge the two Data Tables. In the main body of the procedure, the Merge method is called to merge the new identity value into the original Private Sub On Row Updated( _ By Val sender As Object, By Val e As Sql Row Updated Event Args) ' If this is an insert, then skip this row. In SQL Server, you set the identity property of a column, in Oracle you create a Sequence, and in Microsoft Access you create an Auto Number column. This is especially useful when you need to marshal the changed rows to a separate component that performs the update. New Row() new Row("Company Name") = "New Shipper" shipper. Add(new Row) ' Add changed rows to a new Data Table. The identity output is retrieved by creating a Sql Parameter that has a Parameter Direction of Output. Specifying the ' Parameter Direction for an input parameter is not required. When the Private Sub Retrieve Identity(By Val connection String As String) Using connection As Sql Connection = New Sql Connection( _ connection String) ' Create a Sql Data Adapter based on a SELECT query. NET application as output parameters or as the first returned record of the result set of a SELECT statement executed in the same batch as the INSERT statement. NET can retrieve these values and update the corresponding columns in the Data Row being updated. Private Sub Merge Identity Columns(By Val connection String As String) Using connection As Sql Connection = New Sql Connection( _ connection String) ' Create the Data Adapter Dim adapter As Sql Data Adapter = New Sql Data Adapter( _ "SELECT Shipper ID, Company Name FROM dbo. Some database engines, such as the Microsoft Access Jet database engine, do not support output parameters and cannot process multiple statements in a single batch. Shippers", connection) ' Add the Insert Command to retrieve new identity value. Insert Command = New Sql Command( _ "INSERT INTO dbo. Add( _ New Sql Parameter("@Company Name", Sql Db Type. I apologize if I sound negative, but I have spent a week researching and posting, digging through code and trying to find any information about difference between , Net2 and . @The Learned One: I really do appreciate the input. I'm not at all familier with LINQ-to-SQL, Entity Framework or NHibernate.
A primary key in a relational database is a column or combination of columns that always contain unique values. Write Line("Rows after merge.") Dim row As Data Row For Each row In shipper. Write Line(": ", row(0), row(1)) Next End Using End Sub event handler checks the Statement Type of the Sql Row Updated Event Args to determine if the row is an insert. Skip Current Row End If End Sub values from a Jet 4.0 database. Text ' Add the parameter for the Category Name. Net Framework code, then maybe I might be able to see where the bottleneck exists. It is very difficult for me to help you, so I am trying to give you other options. NET technology, in favor of LINQ-to-SQL, Entity Framework, and NHibernate.Even then, I am not sure if there would be anything I could do to fix it since it would a problem within the Framework. Another possibility is to use the Performance Analysis feature from 2010, to see if it can identify any slow areas in your code. I already said I was using it perfectly fine in my VS 2005 code. ILSpy is a Reflector replacement, since Redgate decided to make people pay for Reflector. However, in testing my new ported code, I came across a strange behavior. :-) @The Learned One: Not sure I understand what exactly you think I should look at using ILSpy. @dineshkakadiya: Thank you for your post, however I didn't ask how to use Update(). It appears as if each individual SQL Statement sent takes significantly longer to process then it did previously (AKA . I can't seem to find any information about any differences between . I didn't find any such documentation anywhere though...
A Data Column can also be used to generate automatically incrementing values by setting the Auto Increment property to true. Following the update, the copy can contain new identity values that must then be merged back into the original property set to Modified, which may be unexpected. This ' Data Table will be used by the Data Adapter.