VB.Net/Database ADO.net/DataSet XML

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Версия от 15:44, 26 мая 2010; Admin (обсуждение | вклад) (1 версия)
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Display XML String from an ADO.NET DataSet

<source lang="vbnet"> Imports System Imports System.Data Imports System.Data.SqlClient Imports System.Collections Imports System.Windows.Forms Imports System.Resources Public Class MainClass

   Shared Dim OleDbConnection As System.Data.OleDb.OleDbConnection
   Shared Dim AddressBookDataAdapter As System.Data.OleDb.OleDbDataAdapter
   Shared Dim AddressBookDataSet As System.Data.DataSet
   Shared Sub Main()
      Connect()
      Display()
      Console.WriteLine( AddressBookDataSet.GetXml() )
      
      
      Display()
      Disconnect()
   End Sub
   Shared Sub Display()
      Dim OleDbSelectCommand As System.Data.OleDb.OleDbCommand
      OleDbSelectCommand = New System.Data.OleDb.OleDbCommand()
      OleDbSelectCommand.rumandText = "SELECT ID, FirstName, LastName,Salary FROM Employee"
      OleDbSelectCommand.Connection = OleDbConnection
      AddressBookDataAdapter = New System.Data.OleDb.OleDbDataAdapter()
      AddressBookDataAdapter.SelectCommand = OleDbSelectCommand
      AddressBookDataSet = New System.Data.DataSet()
      CType(AddressBookDataSet, System.ruponentModel.ISupportInitialize).BeginInit()
      AddressBookDataAdapter.Fill(AddressBookDataSet)
        Dim dataTable As DataTable = AddressBookDataSet.Tables(0)
        " ensure dataTable not empty
        If dataTable.Rows.Count <> 0 Then
           Dim recordNumber As Integer = Convert.ToInt32(dataTable.Rows(0)(0))
           Console.Write( recordNumber.ToString & "  ")
           Console.Write( Convert.ToString(dataTable.Rows(0)(1)) & "  ")
           Console.Write( Convert.ToString(dataTable.Rows(0)(2)) & "  ")
           Console.Write( Convert.ToString(dataTable.Rows(0)(3)) & "  ")
           " display not-found message
        Else
           Console.WriteLine( "No record found" )
        End If
        Console.WriteLine(  )
   End Sub
   Shared Sub Connect()
     OleDbConnection = New System.Data.OleDb.OleDbConnection()
     OleDbConnection.ConnectionString = _
        "Provider=Microsoft.Jet.OLEDB.4.0;Password="""";" & _
        "User ID=Admin;Data Source=Employee.mdb;Mode=Sha" & _
        "re Deny None;Extended Properties="""";" & _
        "Jet OLEDB:System database="""";Jet OLEDB:Regis" & _
        "try Path="""";Jet OLEDB:Database Password="""";" & _
        "Jet OLEDB:Engine Type=5;Jet OLEDB:Dat" & _
        "abase Locking Mode=1;Jet OLEDB:Global Partial " & _
        "Bulk Ops=2;Jet OLEDB:Global Bulk T" & _
        "ransactions=1;Jet OLEDB:New Database " & _
        "Password="""";Jet OLEDB:Create System Databas" & _
        "e=False;Jet OLEDB:Encrypt Database=False;" & _
        "Jet OLEDB:Don"t Copy Locale on Compact=" & _
        "False;Jet OLEDB:Compact Without Replica " & _
        "Repair=False;Jet OLEDB:SFP=False"
     Try
        OleDbConnection.Open()
     Catch ex As Exception
        Console.WriteLine(ex.Message)
     End Try
   End Sub
   Shared Sub Disconnect()
     Try
        OleDbConnection.Close()
     Catch ex As Exception
        Console.WriteLine(ex.Message)
     End Try
   End Sub

End Class


 </source>


Generating XML from an ADO.NET DataSet

<source lang="vbnet"> Imports System Imports System.Data Imports System.Data.SqlClient Imports System.Collections Imports System.Windows.Forms Imports System.Resources Public Class MainClass

   Shared Dim OleDbConnection As System.Data.OleDb.OleDbConnection
   Shared Dim AddressBookDataAdapter As System.Data.OleDb.OleDbDataAdapter
   Shared Dim AddressBookDataSet As System.Data.DataSet
   Shared Sub Main()
      Connect()
      Display()
      
      AddressBookDataSet.WriteXml("Employee.xml")
      Display()
      Disconnect()
   End Sub
   Shared Sub Display()
      Dim OleDbSelectCommand As System.Data.OleDb.OleDbCommand
      OleDbSelectCommand = New System.Data.OleDb.OleDbCommand()
      OleDbSelectCommand.rumandText = "SELECT ID, FirstName, LastName,Salary FROM Employee"
      OleDbSelectCommand.Connection = OleDbConnection
      AddressBookDataAdapter = New System.Data.OleDb.OleDbDataAdapter()
      AddressBookDataAdapter.SelectCommand = OleDbSelectCommand
      AddressBookDataSet = New System.Data.DataSet()
      CType(AddressBookDataSet, System.ruponentModel.ISupportInitialize).BeginInit()
      AddressBookDataAdapter.Fill(AddressBookDataSet)
        Dim dataTable As DataTable = AddressBookDataSet.Tables(0)
        " ensure dataTable not empty
        If dataTable.Rows.Count <> 0 Then
           Dim recordNumber As Integer = Convert.ToInt32(dataTable.Rows(0)(0))
           Console.Write( recordNumber.ToString & "  ")
           Console.Write( Convert.ToString(dataTable.Rows(0)(1)) & "  ")
           Console.Write( Convert.ToString(dataTable.Rows(0)(2)) & "  ")
           Console.Write( Convert.ToString(dataTable.Rows(0)(3)) & "  ")
           " display not-found message
        Else
           Console.WriteLine( "No record found" )
        End If
        Console.WriteLine(  )
   End Sub
   Shared Sub Connect()
     OleDbConnection = New System.Data.OleDb.OleDbConnection()
     OleDbConnection.ConnectionString = _
        "Provider=Microsoft.Jet.OLEDB.4.0;Password="""";" & _
        "User ID=Admin;Data Source=Employee.mdb;Mode=Sha" & _
        "re Deny None;Extended Properties="""";" & _
        "Jet OLEDB:System database="""";Jet OLEDB:Regis" & _
        "try Path="""";Jet OLEDB:Database Password="""";" & _
        "Jet OLEDB:Engine Type=5;Jet OLEDB:Dat" & _
        "abase Locking Mode=1;Jet OLEDB:Global Partial " & _
        "Bulk Ops=2;Jet OLEDB:Global Bulk T" & _
        "ransactions=1;Jet OLEDB:New Database " & _
        "Password="""";Jet OLEDB:Create System Databas" & _
        "e=False;Jet OLEDB:Encrypt Database=False;" & _
        "Jet OLEDB:Don"t Copy Locale on Compact=" & _
        "False;Jet OLEDB:Compact Without Replica " & _
        "Repair=False;Jet OLEDB:SFP=False"
     Try
        OleDbConnection.Open()
     Catch ex As Exception
        Console.WriteLine(ex.Message)
     End Try
   End Sub
   Shared Sub Disconnect()
     Try
        OleDbConnection.Close()
     Catch ex As Exception
        Console.WriteLine(ex.Message)
     End Try
   End Sub

End Class


 </source>

<A href="http://www.vbex.ru/Code/VBDownload/Employee.zip">Employee.zip( 7 k)</a>


Write Data in DataSet to XML file

<source lang="vbnet"> Imports System Imports System.IO Imports System.Data Imports System.Data.SqlClient Imports System.Configuration Imports System.Xml Imports System.Windows.Forms public class MainClass

  Shared Sub Main()
     Dim form1 As Form = New Form1
     Application.Run(form1)
  End Sub

End Class


Public Class Form1

  Inherits System.Windows.Forms.Form
  1. Region " Windows Form Designer generated code "
  Public Sub New()
     MyBase.New()
     "This call is required by the Windows Form Designer.
     InitializeComponent()
     "Add any initialization after the InitializeComponent() call
  End Sub
  "Form overrides dispose to clean up the component list.
  Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
     If disposing Then
        If Not (components Is Nothing) Then
           components.Dispose()
        End If
     End If
     MyBase.Dispose(disposing)
  End Sub
  "Required by the Windows Form Designer
  Private components As System.ruponentModel.IContainer
  "NOTE: The following procedure is required by the Windows Form Designer
  "It can be modified using the Windows Form Designer.  
  "Do not modify it using the code editor.
  Friend WithEvents btnConfigXML As System.Windows.Forms.Button
  Friend WithEvents XmlGrid As System.Windows.Forms.DataGrid
  <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
     Me.btnConfigXML = New System.Windows.Forms.Button
     Me.XmlGrid = New System.Windows.Forms.DataGrid
     CType(Me.XmlGrid, System.ruponentModel.ISupportInitialize).BeginInit()
     Me.SuspendLayout()
     "
     "btnConfigXML
     "
     Me.btnConfigXML.Location = New System.Drawing.Point(16, 27)
     Me.btnConfigXML.Name = "btnConfigXML"
     Me.btnConfigXML.Size = New System.Drawing.Size(75, 37)
     Me.btnConfigXML.TabIndex = 2
     Me.btnConfigXML.Text = "Configure XML"
     "
     "XmlGrid
     "
     Me.XmlGrid.DataMember = ""
     Me.XmlGrid.HeaderForeColor = System.Drawing.SystemColors.ControlText
     Me.XmlGrid.Location = New System.Drawing.Point(112, 8)
     Me.XmlGrid.Name = "XmlGrid"
     Me.XmlGrid.Size = New System.Drawing.Size(304, 336)
     Me.XmlGrid.TabIndex = 3
     "
     "Form1
     "
     Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
     Me.ClientSize = New System.Drawing.Size(424, 349)
     Me.Controls.Add(Me.XmlGrid)
     Me.Controls.Add(Me.btnConfigXML)
     Me.Name = "Form1"
     Me.Text = "XML Demo"
     CType(Me.XmlGrid, System.ruponentModel.ISupportInitialize).EndInit()
     Me.ResumeLayout(False)
  End Sub
  1. End Region
  Private Sub form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs)  Handles MyBase.Load
     " Create connection
     Dim thisConnection As New SqlConnection("Server=(local)\SQLEXPRESS;Initial Catalog=MyDatabase;Integrated Security=SSPI") 
     " Query string
     Dim sql As String = _
        "SELECT ID, LastName " & _
        "FROM Employee " & _
        "FOR XML AUTO"
     " Create Connection
     Dim thisCommand As New SqlCommand(sql, thisConnection)
     Try
        thisConnection.Open()
        Dim reader As XmlReader = thisCommand.ExecuteXmlReader()
        Dim ds As New DataSet
        ds.ReadXml(reader, XmlReadMode.InferSchema)
        XmlGrid.DataSource = ds
        " Write Data in DataSet to XML file
        ds = CType(XmlGrid.DataSource, DataSet)
        ds.WriteXml("XMLFileOut.xml", XmlWriteMode.IgnoreSchema)
     Catch ex As SqlException
        MessageBox.Show(ex.Message)
     Finally
        thisConnection.Close()
     End Try
  End Sub

End Class


 </source>


XML DataSet

<source lang="vbnet"> Imports System.Data.SqlClient Imports System.Windows.Forms <Global.Microsoft.VisualBasic.rupilerServices.DesignerGenerated()> _ Partial Class XmlTest

   Inherits System.Windows.Forms.Form
   <System.Diagnostics.DebuggerStepThrough()> _
   Private Sub InitializeComponent()
       Me.grid = New System.Windows.Forms.DataGridView
       Me.txtFile = New System.Windows.Forms.TextBox
       Me.cmdRead = New System.Windows.Forms.Button
       Me.cmdWrite = New System.Windows.Forms.Button
       CType(Me.grid, System.ruponentModel.ISupportInitialize).BeginInit()
       Me.SuspendLayout()
       "
       Me.grid.Anchor = CType((((System.Windows.Forms.AnchorStyles.Top Or System.Windows.Forms.AnchorStyles.Bottom) _
                   Or System.Windows.Forms.AnchorStyles.Left) _
                   Or System.Windows.Forms.AnchorStyles.Right), System.Windows.Forms.AnchorStyles)
       Me.grid.ColumnHeadersHeightSizeMode = System.Windows.Forms.DataGridViewColumnHeadersHeightSizeMode.AutoSize
       Me.grid.Location = New System.Drawing.Point(11, 43)
       Me.grid.Name = "grid"
       Me.grid.Size = New System.Drawing.Size(352, 212)
       Me.grid.TabIndex = 8
       "
       Me.txtFile.Anchor = CType(((System.Windows.Forms.AnchorStyles.Top Or System.Windows.Forms.AnchorStyles.Left) _
                   Or System.Windows.Forms.AnchorStyles.Right), System.Windows.Forms.AnchorStyles)
       Me.txtFile.Location = New System.Drawing.Point(11, 14)
       Me.txtFile.Size = New System.Drawing.Size(160, 21)
       Me.txtFile.TabIndex = 7
       Me.txtFile.Text = "c:\DataSet.xml"
       "
       Me.cmdRead.Anchor = CType((System.Windows.Forms.AnchorStyles.Top Or System.Windows.Forms.AnchorStyles.Right), System.Windows.Forms.AnchorStyles)
       Me.cmdRead.Location = New System.Drawing.Point(271, 12)
       Me.cmdRead.Size = New System.Drawing.Size(92, 24)
       Me.cmdRead.TabIndex = 6
       Me.cmdRead.Text = "Read From XML"
       "
       Me.cmdWrite.Anchor = CType((System.Windows.Forms.AnchorStyles.Top Or System.Windows.Forms.AnchorStyles.Right), System.Windows.Forms.AnchorStyles)
       Me.cmdWrite.Location = New System.Drawing.Point(183, 12)
       Me.cmdWrite.Size = New System.Drawing.Size(84, 24)
       Me.cmdWrite.TabIndex = 5
       Me.cmdWrite.Text = "Write to XML"
       "
       "XmlTest
       "
       Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
       Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
       Me.ClientSize = New System.Drawing.Size(375, 266)
       Me.Controls.Add(Me.grid)
       Me.Controls.Add(Me.txtFile)
       Me.Controls.Add(Me.cmdRead)
       Me.Controls.Add(Me.cmdWrite)
       Me.Font = New System.Drawing.Font("Tahoma", 8.25!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
       Me.Name = "XmlTest"
       Me.Text = "XmlTest"
       CType(Me.grid, System.ruponentModel.ISupportInitialize).EndInit()
       Me.ResumeLayout(False)
       Me.PerformLayout()
   End Sub
   Friend WithEvents grid As System.Windows.Forms.DataGridView
   Friend WithEvents txtFile As System.Windows.Forms.TextBox
   Friend WithEvents cmdRead As System.Windows.Forms.Button
   Friend WithEvents cmdWrite As System.Windows.Forms.Button
   Private Sub cmdWrite_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdWrite.Click
       Dim SQL As String = "SELECT * FROM Products"
       Dim Connect As String = "Data Source=localhost;Integrated Security=True;Initial Catalog=Northwind;"
       Dim con As New SqlConnection(Connect)
       Dim cmd As New SqlCommand(SQL, con)
       Dim adapter As New SqlDataAdapter(cmd)
       Dim dsNorthwind As New DataSet()
       con.Open()
       adapter.Fill(dsNorthwind, "Products")
       con.Close()
       dsNorthwind.WriteXmlSchema(txtFile.Text & ".xsd")
       dsNorthwind.WriteXml(txtFile.Text)
   End Sub
   Private Sub cmdRead_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdRead.Click
       Dim dsNorthwind As New DataSet()
       If System.IO.File.Exists(txtFile.Text) Then
           dsNorthwind.ReadXml(txtFile.Text)
           grid.DataSource = dsNorthwind.Tables(0)
       Else
           MessageBox.Show("You need to create this file first.")
       End If
   End Sub

End Class


 </source>