в 16:40, 26 мая 2010

2010-05-26T16:40:06Z

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2010-05-26T12:44:45Z

1 версия

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==Set SqlDataAdapter Update Batch Size==

<source lang="vbnet">
Imports System
Imports System.Data
Imports System.Windows.Forms
Imports System.Data.SqlClient
Imports System.IO
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
Private cb As SqlCommandBuilder
Private da As SqlDataAdapter
#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 DataGrid1 As System.Windows.Forms.DataGrid
Friend WithEvents buttonUpdate As System.Windows.Forms.Button
Friend WithEvents DataSet1 As System.Data.DataSet
Friend WithEvents SqlCommand1 As System.Data.SqlClient.SqlCommand
<System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
Me.DataGrid1 = New System.Windows.Forms.DataGrid
Me.buttonUpdate = New System.Windows.Forms.Button
Me.DataSet1 = New System.Data.DataSet
Me.SqlCommand1 = New System.Data.SqlClient.SqlCommand
CType(Me.DataGrid1, System.ruponentModel.ISupportInitialize).BeginInit()
CType(Me.DataSet1, System.ruponentModel.ISupportInitialize).BeginInit()
Me.SuspendLayout()
"
"DataGrid1
"
Me.DataGrid1.DataMember = ""
Me.DataGrid1.HeaderForeColor = System.Drawing.SystemColors.ControlText
Me.DataGrid1.Location = New System.Drawing.Point(8, 8)
Me.DataGrid1.Name = "DataGrid1"
Me.DataGrid1.Size = New System.Drawing.Size(400, 192)
Me.DataGrid1.TabIndex = 0
"
"buttonUpdate
"
Me.buttonUpdate.Location = New System.Drawing.Point(171, 208)
Me.buttonUpdate.Name = "buttonUpdate"
Me.buttonUpdate.TabIndex = 1
Me.buttonUpdate.Text = "Update"
"
"DataSet1
"
Me.DataSet1.DataSetName = "NewDataSet"
Me.DataSet1.Locale = New System.Globalization.CultureInfo("en-GB")
"
"Form1
"
Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
Me.ClientSize = New System.Drawing.Size(416, 245)
Me.Controls.Add(Me.buttonUpdate)
Me.Controls.Add(Me.DataGrid1)
Me.Name = "Form1"
Me.Text = "Form1"
CType(Me.DataGrid1, System.ruponentModel.ISupportInitialize).EndInit()
CType(Me.DataSet1, 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 object
Dim thisConnection As New SqlConnection("server=(local)\SQLEXPRESS;" & _
"integrated security=sspi;database=MyDatabase")
" Sql Query
Dim sql As String = "SELECT * FROM Employee"
" Create a Command
SqlCommand1 = New SqlCommand(sql, thisConnection)
" Create SqlDataAdapter
da = New SqlDataAdapter
da.SelectCommand = SqlCommand1
" Create SqlCommandBuilder object
cb = New SqlCommandBuilder(da)
" Fill Dataset
da.Fill(DataSet1, "Employee")
" Bind the data to the grid at runtime
DataGrid1.SetDataBinding(DataSet1, "Employee")
End Sub
Private Sub buttonUpdate_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles buttonUpdate.Click
da.UpdateBatchSize = 10
da.Update(DataSet1, "Employee")
End Sub
End Class

</source>

==SqlDataAdapter Event: updated and updating==

<source lang="vbnet">
Imports System
Imports System.Data
Imports System.Data.SqlClient

public class MainClass
Shared Sub Main()
Dim thisConnection As New SqlConnection("server=(local)\SQLEXPRESS;" & _
"integrated security=sspi;database=MyDatabase")
Dim sql As String = "SELECT FirstName, LastName From Employee"
Try
thisConnection.Open()
Dim thisAdapter As New SqlDataAdapter(sql, thisConnection)
Dim cb As New SqlCommandBuilder(thisAdapter)
Dim ds As New DataSet
thisAdapter.Fill(ds, 0, 1, "Customers")
AddHandler thisAdapter.RowUpdating, AddressOf OnRowUpdating
AddHandler thisAdapter.RowUpdated, AddressOf OnRowUpdated
Dim dt As DataTable = ds.Tables("Customers")
dt.Rows(0)(1) = "The Volcano Corporation"
thisAdapter.Update(ds, "Customers")
RemoveHandler thisAdapter.RowUpdating, AddressOf OnRowUpdating
RemoveHandler thisAdapter.RowUpdated, AddressOf OnRowUpdated
Catch ex As SqlException
Console.WriteLine(ex.Message)
Finally
" Close Connection
thisConnection.Close()
End Try
End Sub
" Handler for OnRowUpdating
Shared Private Sub OnRowUpdating(ByVal sender As Object, ByVal e As SqlRowUpdatingEventArgs)
Console.WriteLine("OnRowUpdating Event")
If Not e.Status = UpdateStatus.Continue Then
Console.WriteLine("RowStatus = " & e.Status.ToString())
End If
End Sub
" Handler for OnRowUpdated
Shared Private Sub OnRowUpdated(ByVal sender As Object, ByVal e As SqlRowUpdatedEventArgs)
Console.WriteLine("OnRowUpdated Event")
Console.WriteLine("Records Affected = " & e.RecordsAffected.ToString())
End Sub
End Class

</source>

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в 16:40, 26 мая 2010

Admin: 1 версия