VB.Net/Data Structure/Column Map — различия между версиями
Admin (обсуждение | вклад) м (1 версия) |
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(нет различий)
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Текущая версия на 12:45, 26 мая 2010
Use DataColumnMapping to Map column
Imports System
Imports System.Xml
Imports System.Xml.Schema
Imports System.IO
Imports System.Data.OleDb
Imports System.Data.rumon
Imports System.Data
Public Class MainClass
Shared Sub DoDataMappings(ByVal da As OleDbDataAdapter)
Try
" Define an array of column to map
Dim dcmMappedColumns() As DataColumnMapping = { _
New DataColumnMapping("ID", "EmployeeID"), _
New DataColumnMapping("FirstName", "FirstName"), _
New DataColumnMapping("LastName", "LastName")}
" Define the table containing the mapped columns
Dim dtmUsers As New DataTableMapping("Table", "Employee", _
dcmMappedColumns)
" Activate the mapping mechanism
da.TableMappings.Add(dtmUsers)
Catch ex As Exception
" An error occurred. Show the error message
Console.WriteLine(ex.Message)
End Try
End Sub
Shared Sub Main()
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)
Dim dsUsers As New DataSet("Employee")
DoDataMappings(daUsers)
" Fill the dataset
daUsers.Fill(dsUsers)
" Go through the records and print them using the mapped names
Dim r As DataRow
For Each r In dsUsers.Tables("Employee").Rows
Console.WriteLine("ID: {0}, FirstName: {1}, LastName: {2}", r("EmployeeID"), r("FirstName"), r("LastName"))
Next
Catch ex As Exception
" An error occurred. Show the error message
Console.WriteLine(ex.Message)
End Try
End Sub
End Class
<A href="http://www.vbex.ru/Code/VBDownload/Employee.zip">Employee.zip( 7 k)</a>