VB.Net/Database ADO.net/Table Schema
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
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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
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