VB.Net/Database ADO.net/DataSet XML
Содержание
Display XML String from an ADO.NET DataSet
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
Generating XML from an ADO.NET DataSet
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<A href="http://www.vbex.ru/Code/VBDownload/Employee.zip">Employee.zip( 7 k)</a>
Write Data in DataSet to XML file
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
#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
#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
XML DataSet
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