ADO.NET

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CONSULTAS ADO.NET

1.‐Propiedades del ListBox y ComboBox.

Seleccionamos el Listbox.

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Seleccionamos El ComboBox

CODIGO FUENTE: Imports System.Data Imports System.Data.SqlClient Public Class Form2

Dim cn As New SqlConnection("server=(local);integrated security=sspi;database=neptuno")

Private Sub Form2_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

llenadoComboBox() llenadoListBox()

End Sub Sub llenadoComboBox()

Dim cad As String = "select * from clientes" Dim da As New SqlDataAdapter(cad, cn) Dim tbl As New DataTable da.Fill(tbl) ComboBox1.DataSource = tbl Me.ComboBox1.DisplayMember = "nombrecompañia" 'Campo a Mostar Me.ComboBox1.ValueMember = "Idcliente" 'Campo a evaluar

End Sub Sub llenadoListBox()

Dim cad As String = "select * from Clientes" Dim da As New SqlDataAdapter(cad, cn) Dim tbl As New DataTable da.Fill(tbl) ListBox1.DataSource = tbl Me.ListBox1.DisplayMember = "nombrecompañia" 'Campo a Mostar Me.ListBox1.ValueMember = "Idcliente" 'Campo a evaluar

End Sub

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Private Sub ListBox1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ListBox1.SelectedIndexChanged

Try Me.lblmostar.Text = Me.ListBox1.Text Me.lblevaluar.Text = Me.ListBox1.SelectedValue

Catch ex As Exception

End Try End Sub

Private Sub ComboBox1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ComboBox1.SelectedIndexChanged

Try Me.lblmostar.Text = Me.ComboBox1.Text Me.lblevaluar.Text = Me.ComboBox1.SelectedValue

Catch ex As Exception

End Try End Sub

End Class

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2.‐Crear una Aplicación que nos permita listar los Meses de Venta en un Listbox.

ADO.NET

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Luego de haber listado los meses de venta ,Seleccionar de uno a varios meses de venta ,listando en un DataGridview la Cantidad de pedidos del cliente por mes Seleccionado.

ADO.NET

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Seleccionar en el DataGridview o Haciendo un Check,luego presionar el boton Grabar ,Devera grabar uno varios clientes seleccionados en una Tabla Creada Vendidos.

Tabla Vendidos

create table Vendidos(

pedido int, precio money, cantidad int, total money, mes varchar(20))

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Luego de haber grabado Mostrar el Ranking de Pedidos Vendidos de la Tabla Vendidos.

Claro que se devera mostrar en Tabla Vendidos.

select * from vendidos

ADO.NET

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CODIGO FUENTE: Imports System.Data Imports System.Data.SqlClient Public Class Form1

Dim cn As New SqlConnection("server=(local);integrated security=sspi;database=neptuno")

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

Dim cad As String = "select distinct datename(month,fechapedido) as Fecha from pedidos"

Dim cmd As New SqlCommand(cad, cn) cn.Open() Dim dr As SqlDataReader = cmd.ExecuteReader While (dr.Read)

Me.ListBox1.Items.Add(dr("Fecha")) End While cn.Close()

End Sub

Private Sub ListBox1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ListBox1.SelectedIndexChanged

Try Dim mes As String = "" For i As Integer = 0 To Me.ListBox1.Items.Count ­ 1

If (Me.ListBox1.GetSelected(i)) Then mes = mes + "'" + Me.ListBox1.Items(i) + "',"

End If Next mes = mes.Substring(0, mes.Length ­ 1) Dim cadena As String = "select

c.idcliente,nombrecompañia,count(p.idpedido) as Cantidad," & _ " sum(preciounidad*cantidad) as

total,datename(month,fechapedido) as Fecha" & _ " from clientes c ,pedidos p,[Detalles de pedidos]d where

c.idcliente=p.idcliente and " & _ " p.idpedido=d.idpedido and datename(month,fechapedido) in("

& mes & ")" & _ " group by

c.idcliente,nombrecompañia,datename(month,fechapedido)" Dim cmd As New SqlCommand(cadena, cn) Dim da As New SqlDataAdapter(cmd) Dim tbl As New DataTable da.Fill(tbl) Me.DataGridView1.DataSource = tbl

Catch ex As Exception End Try

End Sub

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

Try Dim cod As String = "" Dim mes As String = "" For Each row As DataGridViewRow In Me.DataGridView1.Rows

Dim ch As DataGridViewCheckBoxCell = CType(row.Cells(0), DataGridViewCheckBoxCell)

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If (ch.Value) Then cod = cod + "'" + row.Cells(1).Value.ToString() + "'," mes = mes + "'" + row.Cells(5).Value.ToString() + "'," End If

Next cod = cod.Substring(0, cod.Length ­ 1) mes = mes.Substring(0, mes.Length ­ 1) Dim cadena As String = "select

p.idpedido,preciounidad,cantidad,(preciounidad*cantidad) as total,datename(month,fechapedido) as Mes" & _

" from [detalles de pedidos]d, pedidos p where p.idpedido=d.idpedido and " & _

" idcliente in (" & cod & ") and datename(month,fechapedido) in (" & mes & ")"

Dim cmd As New SqlCommand(cadena, cn) Dim da As New SqlDataAdapter(cmd) Dim tbl As New DataTable da.Fill(tbl) Dim j As Integer For i As Integer = 0 To tbl.Rows.Count ­ 1

Dim cad As String = "insert into Vendidos (pedido,precio,cantidad,total,mes) values (@pedido,@precio,@cantidad,@total,@mes)"

Dim cmd1 As New SqlCommand(cad, cn) cmd1.Parameters.Add("@pedido", SqlDbType.Int).Value =

tbl.Rows(i)(0) cmd1.Parameters.Add("@precio", SqlDbType.Money).Value =

tbl.Rows(i)(1) cmd1.Parameters.Add("@cantidad", SqlDbType.Int).Value =

tbl.Rows(i)(2) cmd1.Parameters.Add("@total", SqlDbType.Money).Value =

tbl.Rows(i)(3) cmd1.Parameters.Add("@mes", SqlDbType.VarChar, 20).Value

= tbl.Rows(i)(4) cn.Open() j = cmd1.ExecuteNonQuery() cn.Close()

Next If j > 0 Then

MsgBox("Grabo Correctamente", MsgBoxStyle.YesNoCancel) ListadoVendidos()

End If Catch ex As Exception End Try

End Sub Sub ListadoVendidos()

Dim cad As String = "select * from vendidos order by cantidad desc"

Dim da As New SqlDataAdapter(cad, cn) Dim tbl As New DataTable da.Fill(tbl) Me.DataGridView2.DataSource = tbl Me.lbltotal.Text = tbl.Compute("sum(total)", "") Me.lblcantidad.Text = tbl.Compute("sum(cantidad)", "")

End Sub End Class