VB.Net by API/System.Data/CommandBehavior
CommandBehavior.SchemaOnly
<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 Button1 As System.Windows.Forms.Button Friend WithEvents SchemaTableList As System.Windows.Forms.ListView <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent() Me.Button1 = New System.Windows.Forms.Button() Me.SchemaTableList = New System.Windows.Forms.ListView() Me.SuspendLayout() " "Button1 " Me.Button1.Location = New System.Drawing.Point(808, 520) Me.Button1.Name = "Button1" Me.Button1.Size = New System.Drawing.Size(136, 23) Me.Button1.TabIndex = 3 Me.Button1.Text = "Read Schema" " "SchemaTableList " Me.SchemaTableList.Dock = System.Windows.Forms.DockStyle.Top Me.SchemaTableList.Name = "SchemaTableList" Me.SchemaTableList.Size = New System.Drawing.Size(952, 512) Me.SchemaTableList.TabIndex = 2 " "Form1 " Me.AutoScaleBaseSize = New System.Drawing.Size(6, 15) Me.ClientSize = New System.Drawing.Size(952, 552) Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.Button1, Me.SchemaTableList}) Me.Name = "Form1" Me.Text = "Form1" 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 conn As OleDbConnection = New OleDbConnection _ ("Provider=SQLOLEDB;Data Source=(local)\SQLEXPRESS;Initial Catalog=MyDatabase;uid=sa;pwd=vbex;") " Retrieving schema for columns from a single table Dim cmd As OleDbCommand = New OleDbCommand("Employee", conn) cmd.rumandType = CommandType.TableDirect " Retrieve schema only conn.Open() Dim reader As OleDbDataReader = cmd.ExecuteReader(CommandBehavior.SchemaOnly) " Get references to schema information Dim SchemaTable As DataTable = reader.GetSchemaTable() " Close and release the connection before processing results reader.Close() conn.Close() " Display schema table column headers Dim col As DataColumn SchemaTableList.View = View.Details For Each col In SchemaTable.Columns SchemaTableList.Columns.Add(col.ColumnName, 100, HorizontalAlignment.Left) Next " Display schema Dim row As DataRow Dim ColCount As Integer = SchemaTable.Columns.Count For Each row In SchemaTable.Rows Dim OrderDetails(ColCount) As String Dim ColIdx As Integer For ColIdx = 0 To ColCount - 1 OrderDetails(ColIdx) = Convert.ToString(row(ColIdx)) Next Dim NewItem As ListViewItem = New ListViewItem(OrderDetails) SchemaTableList.Items.Add(NewItem) Next End Sub
End Class
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