6
Studi Kasus
KASUS 1: KONVERSI SUHU •
Jalankan aplikasi Embedded Visual Basic 3.0
•
Buat File baru, dan pilih file yang menggunakan form yaitu Windows CE for Pocket PC 2002. Lalu tambahkan kontrol-kontrol seperti dibawah ini.
Kontrol Form Label Label Label TextBox TextBox Command Button Studi Kasus
Nama frmUtama lblJudul lblCelcius lblFahrenheit txtCelcius txtFahrenheit cmdTutup Halaman 63
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Atur properties untuk masing-masing kontrol seperti sebagai berikut. Nama Kontrol frmUtama lblJudul lblJudul lblCelcius lblFahrenheit txtCelcius txtFahrenheit txtTutup
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Properties Caption Caption Alligment Caption Caption Text Text Caption
Nilai Konversi Suhu KONVERSI SUHU 2 - vbCenter Celcius : Fahrenheit : 0 0 Tutup
Masuklah ke bagian Code Editor dengan double-click form. Dan tambahkan isi kan kode program berikut ini. Kode Program 5.1 Option Explicit Dim focus As Byte
Private Sub cmdTutup_Click() App.End End Sub
Private Sub Form_OKClick() App.End End Sub
Private Sub txtCelcius_Change() If txtCelcius.Text = "" Then txtCelcius.Text = 0 If
focus
=
1
Then
txtFahrenheit.Text
=
((9
/
5)
*
CDbl(txtCelcius.Text)) + 32 End Sub
Private Sub txtCelcius_KeyPress(KeyAscii As Integer) focus = 1 If Not ((KeyAscii >= Asc("0") And KeyAscii <= Asc("9")) Or KeyAscii = 8) Then KeyAscii = 0
Halaman 64
Studi Kasus
End If End Sub
Private Sub txtFahrenheit_Change() If txtFahrenheit.Text = "" Then txtFahrenheit.Text = 0 If focus = 2 Then txtCelcius.Text = (5 / 9) * (CDbl(txtFahrenheit.Text) - 32) End Sub
Private Sub txtFahrenheit_KeyPress(ByVal KeyAscii As Integer) focus = 2 If Not ((KeyAscii >= Asc("0") And KeyAscii <= Asc("9")) Or KeyAscii = 8) Then KeyAscii = 0 End If End Sub
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Coba jalankan program dengan menekan tombol Start Debug atau tombol F5
Gambar 6.1 Tampilan program Konversi Suhu
Studi Kasus
Halaman 65
KASUS 2: BUKU ALAMAT •
Jalankan aplikasi Embedded Visual Basic 3.0.
•
Buat File baru, dan pilih file yang menggunakan form, Windows CE for Pocket PC 2002. Lalu tambahkan kontrol-kontrol seperti dibawah ini.
cmbTemp
cmbNama
Kontrol Form Combo Box Combo Box Label Label Label Label Label Label Text Box Text Box Text Box Text Box Text Box Command Button Command Button Command Button Command Button
Halaman 66
Nama frmUtama cmbNama cmbTemp lblJudul lblNama lblPerusahaan lblAlamat lblTelepon lblEmail txtNama txtPerusahaan txtAlamat txtTelepon txtEmail cmdNew cmdSave cmdEdit cmdDelete
Studi Kasus
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Atur properties untuk masing-masing kontrol seperti berikut ini : Nama Kontrol frmUtama lblJudul lblJudul cmbNama cmbTemp cmbTemp lblNama lblPerusahaan lblAlamat lblTelepon lblEmail txtAlamat cmdNew cmdSave cmdSave cmdSave cmdEdit cmdDelete
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Properties Caption Caption Alligment Style Style Visible Caption Caption Caption Caption Caption ScrollBars Caption Caption Enabled Default Caption Caption
Nilai Buku Telepon Buku Telepon 2 – vbCenter 2-vbComboDropdownList 2-vbComboDropdownList False Nama : Perusahaan : Alamat : Telepon : Email : 2 – vbVertical New Save False True Edit Delete
Tambahkan References Microsoft CE ADO Control 3.0 yang terdapat pada menu Project, References. Lalu klik OK
•
Masuklah ke bagian Code Editor dengan double-click form. Dan tambahkan isi kan kode program berikut ini.
Studi Kasus
Halaman 67
Kode Program 5.2 Option Explicit Dim objConnection Dim objRecordset Dim statuus As String Dim databaseName As String Dim Dirubah As Integer
Private Sub cmbNama_Click() showName cmbNama.ListIndex End Sub
Private Sub cmdDelete_Click() Dim a As Integer
a = MsgBox("Apakah anda yakin ingin menghapus data ini??", vbYesNo + vbQuestion, App.Title) If a = vbYes Then objRecordset.Open txtNama.Text
&
"'
"DELETE
AND
id="
FROM &
data
WHERE
nama='"
&
resolveId(cmbNama.ListIndex),
databaseName, 2, 3
txtNama.Text = "" txtPerusahaan.Text = "" txtAlamat.Text = "" txtTelepon.Text = "" txtEmail.Text = "" UpdateCombo End If End Sub
Private Sub cmdEdit_Click() cmdSave.Enabled = True cmdNew.Enabled = False cmdEdit.Enabled = False cmdDelete.Enabled = False cmbNama.Enabled = False
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statuus = "ubah" Dirubah = resolveId(cmbNama.ListIndex)
txtNama.Locked = False txtPerusahaan.Locked = False txtAlamat.Locked = False txtTelepon.Locked = False txtEmail.Locked = False
End Sub
Private Sub cmdNew_Click() txtNama.Text = "" txtPerusahaan.Text = "" txtAlamat.Text = "" txtTelepon.Text = "" txtEmail.Text = ""
txtNama.Locked = False txtPerusahaan.Locked = False txtAlamat.Locked = False txtTelepon.Locked = False txtEmail.Locked = False
cmdSave.Enabled = True cmdNew.Enabled = False cmdEdit.Enabled = False cmdDelete.Enabled = False cmbNama.Enabled = False statuus = "baru" End Sub
Private Sub CmdSave_Click() Dim skarang As Integer
If txtNama.Text <> "" Then If statuus = "baru" Then objRecordset.Open Studi Kasus
"SELECT
id
FROM
data
ORDER
BY
id
ASC",
Halaman 69
databaseName, 2, 3 If objRecordset.RecordCount > 0 Then objRecordset.MoveLast skarang = objRecordset.Fields("id") + 1 Else skarang = 1 End If objRecordset.Close objRecordset.Open "SELECT *
FROM data", databaseName, 2, 3
objRecordset.AddNew objRecordset.Fields("id") = skarang Else objRecordset.Open "SELECT * FROM data WHERE id=" & Dirubah, databaseName, 2, 3 End If objRecordset.Fields("nama") = txtNama.Text objRecordset.Fields("perusahaan") = txtPerusahaan.Text objRecordset.Fields("alamat") = txtAlamat.Text objRecordset.Fields("telepon") = txtTelepon.Text objRecordset.Fields("email") = txtEmail.Text objRecordset.Update objRecordset.Close MsgBox "Data berhasil disimpan", vbOKOnly, App.Title
cmdSave.Enabled = False cmdNew.Enabled = True cmdEdit.Enabled = True cmdDelete.Enabled = True cmbNama.Enabled = True
UpdateCombo Else MsgBox
"Silahkan
masukkan
Nama-nya",
vbOKOnly
+
vbCritical,
App.Title End If
txtNama.Locked = True Halaman 70
Studi Kasus
txtPerusahaan.Locked = True txtAlamat.Locked = True txtTelepon.Locked = True txtEmail.Locked = True
End Sub
Private Sub Form_Load() databaseName = App.Path & "\BukuTelp.cdb" On Error Resume Next
Set objRecordset = CreateObject("ADOCE.Recordset.3.0") UpdateCombo objRecordset.Open "CREATE DATABASE '" & App.Path & "\BukuTelp.cdb'", "", 2, 3 objRecordset.Open
"CREATE
varchar(30),perusahaan
TABLE
data(id
varchar(30),alamat
int,nama text,telepon
varchar(15),email varchar(25))", databaseName, 2, 3
End Sub
Private Sub Form_OKClick() Set objRecordset = Nothing App.End End Sub
Private Sub UpdateCombo() cmbNama.Clear cmbTemp.Clear objRecordset.Open "SELECT * FROM data ORDER BY nama", databaseName, 2, 3 If objRecordset.RecordCount > 0 Then Do cmbNama.AddItem objRecordset.Fields("nama") cmbTemp.AddItem objRecordset.Fields("id") objRecordset.MoveNext Loop Until objRecordset.EOF = True Studi Kasus
Halaman 71
End If objRecordset.Close
If cmbNama.ListCount > 0 Then cmbNama.ListIndex = 0 showName (0) End If
End Sub
Private Sub showName(indexNama As Integer) If resolveId(indexNama) <> 0 Then objRecordset.Open
"SELECT
*
FROM
data
WHERE
id="
&
resolveId(indexNama), databaseName, 2, 3 If objRecordset.RecordCount > 0 Then txtNama.Text = objRecordset.Fields("nama") txtPerusahaan.Text = objRecordset.Fields("perusahaan") txtAlamat.Text = objRecordset.Fields("alamat") txtTelepon.Text = objRecordset.Fields("telepon") txtEmail.Text = objRecordset.Fields("email") End If objRecordset.Close End If End Sub
Private Function resolveId(index As Integer) As Integer If cmbTemp.List(index) <> "" Then resolveId = CInt(cmbTemp.List(index)) Else resolveId = 0 End If End Function
•
Coba jalankan program dengan menekan tombol Start Debug atau tombol F5
Halaman 72
Studi Kasus
Gambar 6.2 Tampilan program Buku Telepon
Studi Kasus
Halaman 73
