в 16:40, 26 мая 2010

2010-05-26T16:40:06Z

Admin: 1 версия

2010-05-26T12:44:57Z

1 версия

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==Bind data into a data grid and do the update==

<source lang="vbnet">
Imports System
Imports System.Collections
Imports System.Data
Imports System.IO
Imports System.Xml.Serialization
Imports System.Xml
Imports System.Windows.Forms
Imports System.Data.SqlClient
Imports System.Data.OleDb
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 dg As System.Windows.Forms.DataGrid
<System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
Me.dg = New System.Windows.Forms.DataGrid()
CType(Me.dg, System.ruponentModel.ISupportInitialize).BeginInit()
Me.SuspendLayout()
"
"dg
"
Me.dg.AlternatingBackColor = System.Drawing.Color.LightGray
Me.dg.BackColor = System.Drawing.Color.DarkGray
Me.dg.CaptionBackColor = System.Drawing.Color.White
Me.dg.CaptionFont = New System.Drawing.Font("Verdana", 10.0!)
Me.dg.CaptionForeColor = System.Drawing.Color.Navy
Me.dg.CaptionText = "Employee"
Me.dg.DataMember = ""
Me.dg.ForeColor = System.Drawing.Color.Black
Me.dg.GridLineColor = System.Drawing.Color.Black
Me.dg.GridLineStyle = System.Windows.Forms.DataGridLineStyle.None
Me.dg.HeaderBackColor = System.Drawing.Color.Silver
Me.dg.HeaderForeColor = System.Drawing.Color.Black
Me.dg.LinkColor = System.Drawing.Color.Navy
Me.dg.Location = New System.Drawing.Point(9, 7)
Me.dg.Name = "dg"
Me.dg.ParentRowsBackColor = System.Drawing.Color.White
Me.dg.ParentRowsForeColor = System.Drawing.Color.Black
Me.dg.SelectionBackColor = System.Drawing.Color.Navy
Me.dg.SelectionForeColor = System.Drawing.Color.White
Me.dg.Size = New System.Drawing.Size(352, 440)
Me.dg.TabIndex = 1
"
"Form1
"
Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
Me.ClientSize = New System.Drawing.Size(370, 455)
Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.dg})
Me.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedSingle
Me.MaximizeBox = False
Me.MinimizeBox = False
Me.Name = "Form1"
Me.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen
Me.Text = "Employee Editor"
CType(Me.dg, System.ruponentModel.ISupportInitialize).EndInit()
Me.ResumeLayout(False)
End Sub
#End Region
Private da As SqlDataAdapter
Private ds As DataSet
Private Sub Form1_Load(ByVal sender As System.Object, _
ByVal e As System.EventArgs) Handles MyBase.Load
" Create a Connection object
Dim dbConn As New SqlConnection("Server=(local)\SQLEXPRESS;Initial Catalog=MyDatabase;Integrated Security=SSPI")

" Create the data adapter object pointing to the authors table
da = New SqlDataAdapter( _
"SELECT ID, FirstName, LastName FROM Employee", dbConn)
" Fill the DataSet
ds = New DataSet("Employee")
da.Fill(ds)
" Display the records in a DataGrid component
dg.DataSource = ds.Tables(0)
End Sub
Private Sub Form1_Closing(ByVal sender As Object, _
ByVal e As System.ruponentModel.CancelEventArgs) Handles MyBase.Closing
" Message box to prompt the save request
If (MessageBox.Show("Do you want save the changes?", _
"Update", _
MessageBoxButtons.YesNo) = DialogResult.Yes) Then
Try
" Create the insert, delete and update statements automatically
Dim cb As New SqlCommandBuilder(da)
" Retrieve just the changed rows
Dim dsChanges As DataSet = ds.GetChanges()
If Not dsChanges Is Nothing Then
" Update the database
da.Update(dsChanges)
" Accept the changes within the DataSet
ds.AcceptChanges()
End If
Catch ex As Exception
" Error occurs, show the message
MessageBox.Show(ex.Message)
End Try
End If
End Sub
End Class

</source>

==Click button to Update DataGrid==

<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.Update(DataSet1, "Employee")
End Sub
End Class

</source>

==DataGrid: Load data table with data reader==

<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
#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
<System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
Me.DataGrid1 = New System.Windows.Forms.DataGrid
CType(Me.DataGrid1, 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, 0)
Me.DataGrid1.Name = "DataGrid1"
Me.DataGrid1.Size = New System.Drawing.Size(552, 280)
Me.DataGrid1.TabIndex = 0
"
"Form1
"
Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
Me.ClientSize = New System.Drawing.Size(568, 285)
Me.Controls.Add(Me.DataGrid1)
Me.Name = "Form1"
Me.Text = "Form1"
CType(Me.DataGrid1, 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
DataGrid1_Navigate(sender, Nothing)
End Sub
Private Sub DataGrid1_Navigate(ByVal sender As Object, ByVal ne As System.Windows.Forms.NavigateEventArgs) Handles DataGrid1.Navigate
" Create Connection object
Dim thisConnection As New SqlConnection("server=(local)\SQLEXPRESS;" & _
"integrated security=sspi;database=MyDatabase")
" Create Command Object
Dim thisCommand As New SqlCommand _
("SELECT * FROM Employee", thisConnection)
" Create Data Reader
Dim thisReader As SqlDataReader
Try
" Open Connection
thisConnection.Open()
" Load data table with data reader
thisReader = thisCommand.ExecuteReader()
Dim dt As New DataTable("Employee")
dt.Load(thisReader)
" Bind data table to datagrid
DataGrid1.DataSource = dt
" Close Reader
thisReader.Close()
Catch ex As Exception
MessageBox.Show(ex.Message)
Finally
" Close Connection
thisConnection.Close()
End Try
End Sub
End Class

</source>

==Load data from database into DataGrid==

<source lang="vbnet">
Imports System
Imports System.Drawing
Imports System.Collections
Imports System.ruponentModel
Imports System.Windows.Forms
Imports System.Data
Imports System.Data.SqlClient

Public Class MainClass
Shared Sub Main( )
Application.Run(New ADOForm1() )
End Sub

End Class
Public Class ADOForm1
Inherits System.Windows.Forms.Form
Private components As System.ruponentModel.Container
Friend WithEvents EmployeeDataGrid As _
System.Windows.Forms.DataGrid
Public Sub New( )
InitializeComponent( )
Dim connectionString As String ="server=(local)\SQLEXPRESS;" & _
"integrated security=sspi;database=MyDatabase"

Dim commandString As String = _
"Select FirstName, LastName from Employee"
Dim myDataAdapter As _
New SqlDataAdapter(commandString, connectionString)
Dim myDataSet As New DataSet( )
myDataAdapter.Fill(myDataSet, "Employee")
" bind the DataSet to the grid
EmployeeDataGrid.DataSource = _
myDataSet.Tables("Employee").DefaultView
End Sub "New
Private Sub InitializeComponent( )
Me.ruponents = New System.ruponentModel.Container( )
Me.EmployeeDataGrid = New System.Windows.Forms.DataGrid( )
EmployeeDataGrid.Location = New System.Drawing.Point(48, 24)
EmployeeDataGrid.Size = New System.Drawing.Size(368, 160)
EmployeeDataGrid.TabIndex = 0
Me.Text = "ADOFrm1"
Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
Me.ClientSize = New System.Drawing.Size(464, 273)
Me.Controls.Add(EmployeeDataGrid)
End Sub
End Class

</source>

==Load result set from "select" command into a DataGrid==

<source lang="vbnet">
Imports System
Imports System.Drawing
Imports System.Collections
Imports System.ruponentModel
Imports System.Windows.Forms
Imports System.Data
Imports System.Data.SqlClient

Public Class MainClass
Shared Sub Main( )
Application.Run(New ADOForm1() )
End Sub

End Class
Public Class ADOForm1
Inherits System.Windows.Forms.Form
Private components As System.ruponentModel.Container
Private dataGrid1 As System.Windows.Forms.DataGrid
" private System.Data.ADO.ADOConnection myConnection;
Private myConnection As System.Data.SqlClient.SqlConnection
Private myDataSet As System.Data.DataSet
Private myCommand As System.Data.SqlClient.SqlCommand
Private myDataAdapter As System.Data.SqlClient.SqlDataAdapter
Public Sub New( )
InitializeComponent( )
Dim connectionString As String ="server=(local)\SQLEXPRESS;" & _
"integrated security=sspi;database=MyDatabase"

myConnection = _
New System.Data.SqlClient.SqlConnection(connectionString)
myConnection.Open( )
" create the DataSet and set a property
myDataSet = New System.Data.DataSet( )
myDataSet.CaseSensitive = True
" create the SqlCommand object and assign the
" connection and the select statement
myCommand = New System.Data.SqlClient.SqlCommand( )
myCommand.Connection = myConnection
myCommand.rumandText = "Select * from Employee"
" create the myDataAdapter object and pass in the
" SQL Command object and establish the table mappings
myDataAdapter = New System.Data.SqlClient.SqlDataAdapter( )
myDataAdapter.SelectCommand = myCommand
myDataAdapter.TableMappings.Add("Table", "Employee")
" Tell the myDataAdapter object to fill the DataSet
myDataAdapter.Fill(myDataSet)
" display it in the grid
dataGrid1.DataSource = _
myDataSet.Tables("Employee").DefaultView
End Sub "New
Private Sub InitializeComponent( )
Me.ruponents = New System.ruponentModel.Container( )
Me.dataGrid1 = New System.Windows.Forms.DataGrid( )
dataGrid1.Location = New System.Drawing.Point(48, 24)
dataGrid1.Size = New System.Drawing.Size(368, 160)
dataGrid1.TabIndex = 0
Me.Text = "ADOFrm1"
Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
Me.ClientSize = New System.Drawing.Size(464, 273)
Me.Controls.Add(dataGrid1)
End Sub
End Class

</source>

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VB.Net/Database ADO.net/DataGrid - История изменений

в 16:40, 26 мая 2010

Admin: 1 версия