VB.Net/Database ADO.net/DataSet XML — различия между версиями
Admin (обсуждение | вклад) м (1 версия) |
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Текущая версия на 15:44, 26 мая 2010
Содержание
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
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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
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<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
- 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
</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
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