OleDb Adapter

參考引用:OleDb Adapter
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Imports System
Imports System.Xml
Imports System.Xml.Schema
Imports System.IO
Imports System.Data.OleDb
Imports System.Data.Common
Imports System.Data


Public Class MainClass
   
    Shared Sub Main()
        Dim dsUsers As New DataSet("Users")

        Try
            ' Define a connection object
            Dim dbConn As New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Password=;User ID=Admin;Data Source=Employee.mdb")

            ' Create a data adapter to retrieve records from db
            Dim daUsers As New OleDbDataAdapter("SELECT ID, FirstName, LastName FROM Employee", dbConn)

            ' Define each column to map
            Dim dcmUserID As New DataColumnMapping("ID", "EmployeeID")
            Dim dcmFirstName As New DataColumnMapping("FirstName", "FirstName")
            Dim dcmLastName As New DataColumnMapping("LastName", "LastName")

            ' Define the table containing the mapped columns
            Dim dtmUsers As New DataTableMapping("Table", "Employee")
            dtmUsers.ColumnMappings.Add(dcmUserID)
            dtmUsers.ColumnMappings.Add(dcmFirstName)
            dtmUsers.ColumnMappings.Add(dcmLastName)

            ' Activate the mapping mechanism
            daUsers.TableMappings.Add(dtmUsers)

            ' Fill the dataset
            daUsers.Fill(dsUsers)

            ' Declare a command builder to create SQL instructions
            ' to create and update records.
            Dim cb As New OleDbCommandBuilder(daUsers)

            ' Insert a new record in the DataSet
            Dim r As DataRow = dsUsers.Tables(0).NewRow()
            r("FirstName") = "Eddie"
            r("LastName") = "Robinson"
            dsUsers.Tables(0).Rows.Add(r)

            ' Insert the record even in the database
            daUsers.Update(dsUsers.GetChanges())

            ' Align in-memory data with the data source ones
            dsUsers.AcceptChanges()

            ' Print successfully message
            Console.WriteLine("A new record has been" & _
              " added to the database.")
        Catch ex As Exception
            ' Reject DataSet changes
            dsUsers.RejectChanges()

            ' An error occurred. Show the error message
            Console.WriteLine(ex.Message)
        End Try
    End Sub
End Class