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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==Get data table schema form SqlDataReader==

<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 * FROM Employee"
Dim thisCommand As New SqlCommand(sql, thisConnection)
Try
thisConnection.Open()
Console.WriteLine("Connection Opened")
Dim thisReader As SqlDataReader = thisCommand.ExecuteReader()
Dim schema As DataTable = thisReader.GetSchemaTable()
For Each row As DataRow In schema.Rows
For Each col As DataColumn In schema.Columns
Console.WriteLine(col.ColumnName & " = " & row(col).ToString())
Next
Console.WriteLine("---------------")
Next
thisReader.Close()
Catch ex As SqlException
Console.WriteLine("Error: " & ex.ToString())
Finally
thisConnection.Close()
Console.WriteLine("Connection Closed")
End Try
End Sub
End Class

</source>

==Use datagrid to display table schema==

<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

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 Button1 As System.Windows.Forms.Button
Friend WithEvents DataGrid1 As System.Windows.Forms.DataGrid
<System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
Me.Button1 = New System.Windows.Forms.Button()
Me.DataGrid1 = New System.Windows.Forms.DataGrid()
CType(Me.DataGrid1, System.ruponentModel.ISupportInitialize).BeginInit()
Me.SuspendLayout()
"
"Button1
"
Me.Button1.Location = New System.Drawing.Point(648, 448)
Me.Button1.Name = "Button1"
Me.Button1.TabIndex = 3
Me.Button1.Text = "Go"
"
"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(720, 432)
Me.DataGrid1.TabIndex = 2
"
"Form1
"
Me.AutoScaleBaseSize = New System.Drawing.Size(6, 15)
Me.ClientSize = New System.Drawing.Size(736, 480)
Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.Button1, Me.DataGrid1})
Me.Name = "Form1"
Me.Text = "Form1"
CType(Me.DataGrid1, System.ruponentModel.ISupportInitialize).EndInit()
Me.ResumeLayout(False)
End Sub
#End Region
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim con As New SqlConnection( _
"Server=(local)\SQLEXPRESS;Initial Catalog=MyDatabase;Integrated Security=SSPI")
Dim cmd As New SqlCommand("SELECT * FROM Employee", con)
Try
con.Open()
Dim reader As SqlDataReader = _
cmd.ExecuteReader(CommandBehavior.SchemaOnly)
DataGrid1.SetDataBinding(reader.GetSchemaTable(), "")
reader.Close()
Finally
con.Close()
End Try
End Sub
End Class

</source>

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VB.Net/Database ADO.net/Table Schema - История изменений

в 16:40, 26 мая 2010

Admin: 1 версия