VB.Net/Database ADO.net/Database ListView

Материал из VB Эксперт
Версия от 12:44, 26 мая 2010; Admin (обсуждение | вклад) (1 версия)
(разн.) ← Предыдущая | Текущая версия (разн.) | Следующая → (разн.)
Перейти к: навигация, поиск

Feed data from database into ListView and ListBox

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 OrderIDsList As System.Windows.Forms.ListBox
    Friend WithEvents Button1 As System.Windows.Forms.Button
    Friend WithEvents Label1 As System.Windows.Forms.Label
    Friend WithEvents OrderDetailsList As System.Windows.Forms.ListView
    Friend WithEvents Label2 As System.Windows.Forms.Label
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.OrderIDsList = New System.Windows.Forms.ListBox()
        Me.Button1 = New System.Windows.Forms.Button()
        Me.Label1 = New System.Windows.Forms.Label()
        Me.OrderDetailsList = New System.Windows.Forms.ListView()
        Me.Label2 = New System.Windows.Forms.Label()
        Me.SuspendLayout()
        "
        "OrderIDsList
        "
        Me.OrderIDsList.ItemHeight = 16
        Me.OrderIDsList.Location = New System.Drawing.Point(8, 32)
        Me.OrderIDsList.Name = "OrderIDsList"
        Me.OrderIDsList.Size = New System.Drawing.Size(216, 356)
        Me.OrderIDsList.TabIndex = 0
        "
        "Button1
        "
        Me.Button1.Location = New System.Drawing.Point(504, 400)
        Me.Button1.Name = "Button1"
        Me.Button1.TabIndex = 1
        Me.Button1.Text = "Start"
        "
        "Label1
        "
        Me.Label1.Location = New System.Drawing.Point(8, 8)
        Me.Label1.Name = "Label1"
        Me.Label1.Size = New System.Drawing.Size(216, 23)
        Me.Label1.TabIndex = 2
        Me.Label1.Text = "Order IDs"
        "
        "OrderDetailsList
        "
        Me.OrderDetailsList.Location = New System.Drawing.Point(232, 32)
        Me.OrderDetailsList.Name = "OrderDetailsList"
        Me.OrderDetailsList.Size = New System.Drawing.Size(352, 360)
        Me.OrderDetailsList.TabIndex = 3
        "
        "Label2
        "
        Me.Label2.Location = New System.Drawing.Point(232, 8)
        Me.Label2.Name = "Label2"
        Me.Label2.Size = New System.Drawing.Size(216, 23)
        Me.Label2.TabIndex = 4
        Me.Label2.Text = "Order Details"
        "
        "Form1
        "
        Me.AutoScaleBaseSize = New System.Drawing.Size(6, 15)
        Me.ClientSize = New System.Drawing.Size(592, 432)
        Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.Label2, Me.OrderDetailsList, Me.Label1, Me.Button1, Me.OrderIDsList})
        Me.Name = "Form1"
        Me.Text = "Form1"
        Me.ResumeLayout(False)
    End Sub
#End Region
    Private con As New SqlConnection( _
      "Server=(local)\SQLEXPRESS;Initial Catalog=Northwind;Integrated Security=SSPI")
    Private Sub Button1_Click(ByVal sender As System.Object, _
                              ByVal e As System.EventArgs) Handles Button1.Click
        Dim cmd As New SqlCommand("SELECT ID FROM Employee", con)
        Try
            con.Open()
            Dim reader As SqlDataReader = cmd.ExecuteReader()
            While reader.Read()
                OrderIDsList.Items.Add(reader.GetInt32(0))
            End While
            reader.Close()
        Finally
            con.Close()
        End Try
    End Sub
    Private ColumnsSet As Boolean = False
    Private Sub OrderIDsList_SelectedIndexChanged( _
                        ByVal sender As Object, ByVal e As System.EventArgs) _
                        Handles OrderIDsList.SelectedIndexChanged
        Dim OrderID As Integer = Convert.ToInt32(OrderIDsList.SelectedItem)
        Dim StoredProcCommand As New SqlCommand("CustOrdersDetail", con)
        With StoredProcCommand
            .rumandType = CommandType.StoredProcedure
            .Parameters.Add("@OrderID", OrderID)
        End With
        Dim RowList As New ArrayList()
        Try
            con.Open()
            Dim reader As SqlDataReader = StoredProcCommand.ExecuteReader()
            While reader.Read()
                Dim Values(reader.FieldCount) As Object
                reader.GetValues(Values)
                RowList.Add(Values)
            End While
            If Not ColumnsSet Then
                Dim schema As DataTable = reader.GetSchemaTable()
                SetColumnHeaders(schema)
            End If
            reader.Close()
        Finally
            con.Close()
        End Try
        PopulateOrderDetails(RowList)
    End Sub
    Private Sub SetColumnHeaders(ByVal schema As DataTable)
        OrderDetailsList.View = View.Details
        Dim row As DataRow
        For Each row In schema.Rows
            OrderDetailsList.Columns.Add( _
                                 row("ColumnName"), 100, HorizontalAlignment.Left)
        Next
        ColumnsSet = True
    End Sub
    Private Sub PopulateOrderDetails(ByVal RowList As ArrayList)
        OrderDetailsList.Items.Clear()
        Dim row As Object()
        For Each row In RowList
            Dim OrderDetails(row.Length) As String
            Dim col As Object
            Dim ColIdx As Integer
            For ColIdx = 0 To row.Length - 1
                OrderDetails(ColIdx) = Convert.ToString(row(ColIdx))
            Next
            Dim NewItem As New ListViewItem(OrderDetails)
            OrderDetailsList.Items.Add(NewItem)
        Next
    End Sub
End Class


Read data and feed into ListBox and ListView using OleDb

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 Label2 As System.Windows.Forms.Label
    Friend WithEvents OrderDetailsList As System.Windows.Forms.ListView
    Friend WithEvents Label1 As System.Windows.Forms.Label
    Friend WithEvents Button1 As System.Windows.Forms.Button
    Friend WithEvents OrderIDsList As System.Windows.Forms.ListBox
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.Label2 = New System.Windows.Forms.Label()
        Me.OrderDetailsList = New System.Windows.Forms.ListView()
        Me.Label1 = New System.Windows.Forms.Label()
        Me.Button1 = New System.Windows.Forms.Button()
        Me.OrderIDsList = New System.Windows.Forms.ListBox()
        Me.SuspendLayout()
        "
        "Label2
        "
        Me.Label2.Location = New System.Drawing.Point(232, 8)
        Me.Label2.Name = "Label2"
        Me.Label2.Size = New System.Drawing.Size(216, 23)
        Me.Label2.TabIndex = 9
        Me.Label2.Text = "Order Details"
        "
        "OrderDetailsList
        "
        Me.OrderDetailsList.Location = New System.Drawing.Point(232, 32)
        Me.OrderDetailsList.Name = "OrderDetailsList"
        Me.OrderDetailsList.Size = New System.Drawing.Size(352, 360)
        Me.OrderDetailsList.TabIndex = 8
        "
        "Label1
        "
        Me.Label1.Location = New System.Drawing.Point(8, 8)
        Me.Label1.Name = "Label1"
        Me.Label1.Size = New System.Drawing.Size(216, 23)
        Me.Label1.TabIndex = 7
        Me.Label1.Text = "Order IDs"
        "
        "Button1
        "
        Me.Button1.Location = New System.Drawing.Point(504, 400)
        Me.Button1.Name = "Button1"
        Me.Button1.TabIndex = 6
        Me.Button1.Text = "Start"
        "
        "OrderIDsList
        "
        Me.OrderIDsList.ItemHeight = 16
        Me.OrderIDsList.Location = New System.Drawing.Point(8, 32)
        Me.OrderIDsList.Name = "OrderIDsList"
        Me.OrderIDsList.Size = New System.Drawing.Size(216, 356)
        Me.OrderIDsList.TabIndex = 5
        "
        "Form1
        "
        Me.AutoScaleBaseSize = New System.Drawing.Size(6, 15)
        Me.ClientSize = New System.Drawing.Size(592, 432)
        Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.Label2, Me.OrderDetailsList, Me.Label1, Me.Button1, Me.OrderIDsList})
        Me.Name = "Form1"
        Me.Text = "Form1"
        Me.ResumeLayout(False)
    End Sub
#End Region
    Private Const ConnString As String = _
        "Provider=SQLOLEDB;Data Source=(local)\SQLEXPRESS;Initial Catalog=Northwind;Integrated Security=SSPI;"
    Private Connection As OleDbConnection = New OleDbConnection(ConnString)
    Private ColumnsSet As Boolean = False
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim command As OleDbCommand = _
            New OleDbCommand("SELECT OrderID FROM Orders", Connection)
        Connection.Open()
        Dim reader As OleDbDataReader = command.ExecuteReader()
        Do While (reader.Read())
            OrderIDsList.Items.Add(reader.GetInt32(0))
        Loop
        reader.Close()
        Connection.Close()
    End Sub
    Private Sub OrderIDsList_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles OrderIDsList.SelectedIndexChanged
        Dim OrderID As Integer = Convert.ToInt32(OrderIDsList.SelectedItem)
        Dim StoredProcCommand As OleDbCommand = New OleDbCommand("CustOrdersDetail", Connection)
        With StoredProcCommand
            .rumandType = CommandType.StoredProcedure
            .Parameters.Add("@OrderID", OrderID)
        End With
        Connection.Open()
        Dim RowList As ArrayList = New ArrayList()
        Dim reader As OleDbDataReader = StoredProcCommand.ExecuteReader()
        Do While reader.Read()
            Dim Values(reader.FieldCount) As Object
            reader.GetValues(Values)
            RowList.Add(Values)
        Loop
        If Not ColumnsSet Then
            Dim schema As DataTable = reader.GetSchemaTable()
            SetColumnHeaders(schema)
        End If
        reader.Close()
        Connection.Close()
        PopulateOrderDetails(RowList)
    End Sub
    Private Sub SetColumnHeaders(ByVal schema As DataTable)
        Dim row As DataRow
        OrderDetailsList.View = View.Details
        For Each row In schema.Rows
            OrderDetailsList.Columns.Add(row("ColumnName"), 100, HorizontalAlignment.Left)
        Next
        ColumnsSet = True
    End Sub
    Private Sub PopulateOrderDetails(ByVal RowList As ArrayList)
        OrderDetailsList.Items.Clear()
        Dim row As Object()
        For Each row In RowList
            Dim OrderDetails(row.Length) As String
            Dim col As Object
            Dim ColIdx As Integer
            For ColIdx = 0 To row.Length - 1
                OrderDetails(ColIdx) = Convert.ToString(row(ColIdx))
            Next
            Dim NewItem As ListViewItem = New ListViewItem(OrderDetails)
            OrderDetailsList.Items.Add(NewItem)
        Next
    End Sub
End Class


Read data table schema and output to a ListView

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 SchemaTableList As System.Windows.Forms.ListView
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.SchemaTableList = New System.Windows.Forms.ListView()
        Me.Button1 = New System.Windows.Forms.Button()
        Me.SuspendLayout()
        "
        "SchemaTableList
        "
        Me.SchemaTableList.Dock = System.Windows.Forms.DockStyle.Top
        Me.SchemaTableList.Name = "SchemaTableList"
        Me.SchemaTableList.Size = New System.Drawing.Size(880, 512)
        Me.SchemaTableList.TabIndex = 0
        "
        "Button1
        "
        Me.Button1.Location = New System.Drawing.Point(736, 520)
        Me.Button1.Name = "Button1"
        Me.Button1.Size = New System.Drawing.Size(136, 23)
        Me.Button1.TabIndex = 1
        Me.Button1.Text = "Read Schema"
        "
        "Form1
        "
        Me.AutoScaleBaseSize = New System.Drawing.Size(6, 15)
        Me.ClientSize = New System.Drawing.Size(880, 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
        Const SelectQuery As String = "SELECT * FROM Employee"
        Dim conn As SqlConnection = New SqlConnection _
            ("Server=(local)\SQLEXPRESS;Initial Catalog=MyDatabase;Integrated Security=SSPI")
        " Retrieving schema for columns from a single table
        Dim cmd As SqlCommand = New SqlCommand(SelectQuery, conn)
        " Retrieve schema only
        conn.Open()
        Dim reader As SqlDataReader = 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
Источник — «http://vbex.ru/index.php?title=VB.Net/Database_ADO.net/Database_ListView&oldid=699»