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IESTP MANUEL SEOANE CORRALES
CONEXIÓN A BASE DE DATOS – 2
1. EJECUTAREMOS EL SIGUEINTE SCRIPT EN SQL-SERVER : MANTENIMIENTO
PROGRAMACIÓN DISTRIBUIDA
CREATE DATABASE MANTENIMIENTO
GO
USE MANTENIMIENTO
GO
CREATE TABLE ARTICULOS
(ID_ARTICULO INT PRIMARY KEY,
NOMBRE_ARTICULO VARCHAR(30),
MARCA VARCHAR(30),
PRECIO MONEY,
STOCK INT)
GO
INSERT INTO ARTICULOS VALUES ('101','MONITOR','LG','400','1000')
INSERT INTO ARTICULOS VALUES ('102','MOUSE','GENIUS','20','1000')
2. EN VISUAL BASIC.NET DISEÑAREMOS EL SIGUIENTE FORMULARIO, EL CUAL DEBE CONECTARSE A LA BASE
DE DATOS CREADA
3. CODIFICAR EL FORMULARIO
Dim cnn As New SqlConnection("Data Source=OMARCITOS;Initial
Catalog=MANTENIMIENTO;Integrated Security=True")
‘Debes generar tu conexión con el servidor de tu Pc
Imports System.Data.SqlClient
Public Class Form1
Sub CARGAR()
Dim cnn As New SqlConnection("…………")
Dim cadena As String
cadena = "Select * from articulos"
Dim cmd As New SqlCommand(cadena, cnn)
cmd.CommandType = CommandType.Text
Dim da As New SqlDataAdapter(cmd)
Dim dt As New DataTable
da.Fill(dt)
DataGridView1.DataSource = dt
End Sub
Lic. Omar Angel Mamani Rodriguez
[email protected]
IESTP MANUEL SEOANE CORRALES
PROGRAMACIÓN DISTRIBUIDA
Sub LIMPIAR()
TextBox1.Text = ""
TextBox2.Text = ""
TextBox3.Text = ""
TextBox4.Text = ""
TextBox5.Text = ""
TextBox1.Focus()
End Sub
Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
CARGAR()
End Sub
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Try
Dim cnn As New SqlConnection("Data Source=OMARCITOS;Initial
Catalog=MANTENIMIENTO;Integrated Security=True")
Dim cadena As String
cnn.Open()
cadena = "INSERT INTO ARTICULOS VALUES ('" & TextBox1.Text & "','" & TextBox2.Text
& "','" & TextBox3.Text & "','" & TextBox4.Text & "','" & TextBox5.Text & "')"
Dim cmd As New SqlCommand(cadena, cnn)
cmd.CommandType = CommandType.Text
cmd.ExecuteNonQuery()
CARGAR()
MsgBox("Los datos se guardaron correctamente")
LIMPIAR()
Catch ex As Exception
MessageBox.Show(ex.Message)
End Try
End Sub
Private Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click
Try
Dim cnn As New SqlConnection("Data Source=OMARCITOS;Initial
Catalog=MANTENIMIENTO;Integrated Security=True")
Dim cadena As String
cnn.Open()
cadena = "UPDATE ARTICULOS SET ID_ARTICULO='" & TextBox1.Text & "',
NOMBRE_ARTICULO='" & TextBox2.Text & "',MARCA='" & TextBox3.Text & "',PRECIO='" &
TextBox4.Text & "',STOCK='" & TextBox5.Text & "' WHERE ID_ARTICULO='" & TextBox1.Text & "'"
Dim cmd As New SqlCommand(cadena, cnn)
cmd.CommandType = CommandType.Text
cmd.ExecuteNonQuery()
CARGAR()
MsgBox("Los datos se guardaron correctamente")
LIMPIAR()
Catch ex As Exception
MessageBox.Show(ex.Message)
End Try
End Sub
Lic. Omar Angel Mamani Rodriguez
[email protected]
IESTP MANUEL SEOANE CORRALES
PROGRAMACIÓN DISTRIBUIDA
Private Sub Button3_Click(sender As Object, e As EventArgs) Handles Button3.Click
Try
If TextBox1.Text <> "" Then
Dim R
R = MsgBox("Desea eliminar", vbYesNo + vbQuestion, "Pregunta")
If R = vbYes Then
Dim cnn As New SqlConnection("Data Source=OMARCITOS;Initial
Catalog=MANTENIMIENTO;Integrated Security=True")
Dim cadena As String
cnn.Open()
cadena = "DELETE FROM ARTICULOS WHERE ID_ARTICULO='" & TextBox1.Text & "'"
Dim cmd As New SqlCommand(cadena, cnn)
cmd.CommandType = CommandType.Text
cmd.ExecuteNonQuery()
CARGAR()
LIMPIAR()
MsgBox("Los datos se ELIMINARON")
Else
MsgBox("NO SE ELIMINO NADA")
End If
Else
MsgBox("INGRESE UN VALOR EN EL ID_ARTICULO-NO SE ELIMINO NADA")
End If
Catch ex As Exception
MessageBox.Show(ex.Message)
End Try
End Sub
Private Sub DataGridView1_RowHeaderMouseClick(sender As Object, e As
DataGridViewCellMouseEventArgs) Handles DataGridView1.RowHeaderMouseClick
TextBox1.Text = DataGridView1.SelectedRows(0).Cells(0).Value
TextBox2.Text = DataGridView1.SelectedRows(0).Cells(1).Value
TextBox3.Text = DataGridView1.SelectedRows(0).Cells(2).Value
TextBox4.Text = DataGridView1.SelectedRows(0).Cells(3).Value
TextBox5.Text = DataGridView1.SelectedRows(0).Cells(4).Value
End Sub
Private Sub TextBox6_TextChanged(sender As Object, e As EventArgs) Handles
TextBox6.TextChanged
Dim cnn As New SqlConnection("Data Source=OMARCITOS;Initial
Catalog=MANTENIMIENTO;Integrated Security=True")
Dim cadena As String
If ComboBox1.Text = "NOMBRE_ARTICULO" Then
cadena = "SELECT * FROM ARTICULOS WHERE NOMBRE_ARTICULO LIKE '" & TextBox6.Text &
"%'"
Else
cadena = "SELECT * FROM ARTICULOS WHERE MARCA LIKE '" & TextBox6.Text & "%'"
End If
Dim cmd As New SqlCommand(cadena, cnn)
cmd.CommandType = CommandType.Text
Dim da As New SqlDataAdapter(cmd)
Dim dt As New DataTable
da.Fill(dt)
DataGridView1.DataSource = dt
End Sub
Private Sub ComboBox1_SelectedIndexChanged(sender As Object, e As EventArgs) Handles
ComboBox1.SelectedIndexChanged
TextBox6.Text = ""
End Sub
Lic. Omar Angel Mamani Rodriguez
[email protected]
IESTP MANUEL SEOANE CORRALES
PROGRAMACIÓN DISTRIBUIDA
Private Sub Button4_Click(sender As Object, e As EventArgs) Handles Button4.Click
LIMPIAR()
End Sub
Private Sub Button5_Click(sender As Object, e As EventArgs) Handles Button5.Click
Close()
End Sub
End Class
4. Diseñar y programar el siguiente formulario (Hacer Los cambios necesarios para que se adapte)

En este formulario colocarás el Id_Articulo y al darle buscar se mostrará sus datos los que le corresponda a la
tabla Articulos.
Lic. Omar Angel Mamani Rodriguez
[email protected]