Sistem Pendukung Keputusan Analisis Investasi Tanah Untuk Perumahan Dengan Metode Topsis

LAMPIRAN A : Listing Program

1. Form Login
Imports MySql.Data.MySqlClient
Public Class formLogin
Dim adapter As MySqlDataAdapter
Dim bc As MySqlDataReader
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e
As System.EventArgs) Handles Button1.Click
If TextBox1.Text = "" Or TextBox2.Text = "" Then
MsgBox("Masukkan username dan password anda.",
MsgBoxStyle.Exclamation, "Perhatian")
TextBox1.Text = ""
TextBox2.Text = ""
TextBox1.Focus()
Else
Call konek()
Dim cmd As New MySqlCommand
cmd.CommandType = CommandType.Text
cmd.CommandText = "Select * from tbl_user where username
= '" & TextBox1.Text & "' and password = '" & TextBox2.Text & "'"

cmd.Connection = conn
cmd = New MySqlCommand(cmd.CommandText, conn)
bc = cmd.ExecuteReader()
If Not bc.HasRows Then
MsgBox("Username atau password salah. Isi kembali.",
MsgBoxStyle.Exclamation, "Error")
bc.Close()
TextBox1.Text = ""
TextBox2.Text = ""
TextBox1.Focus()
Else
bc.Close()
TextBox1.Clear()
TextBox2.Clear()
Me.Visible = False
menuUtama.Show()
End If
End If
End Sub
End Class

2. Form Menu Utama
Public Class menuUtama
Private Sub menuUtama_Load(ByVal sender As System.Object, ByVal e
As System.EventArgs) Handles MyBase.Load
TabControl1.Width = Me.Width
End Sub

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Private Sub PictureBox1_Click(ByVal sender As System.Object,
ByVal e As System.EventArgs) Handles PictureBox1.Click
inputNilai.Show()
End Sub
Private Sub PictureBox2_Click(ByVal sender As System.Object,
ByVal e As System.EventArgs) Handles PictureBox2.Click
konversi.Show()
End Sub

Private Sub PictureBox3_Click(ByVal sender As System.Object,
ByVal e As System.EventArgs) Handles PictureBox3.Click
TabControl1.TabPages(0).Focus()
Me.Close()
formLogin.Show()
End Sub
Private Sub PictureBox4_Click(ByVal sender As System.Object,
ByVal e As System.EventArgs) Handles PictureBox4.Click
informasiSistem.Show()
End Sub
Private Sub PictureBox5_Click(ByVal sender As System.Object,
ByVal e As System.EventArgs) Handles PictureBox5.Click
profil.Show()
End Sub
End Class

3. Form Input Nilai Kriteria

Imports MySql.Data.MySqlClient
Public Class inputNilai

Dim adapter As MySqlDataAdapter
Dim table As DataTable
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles MyBase.Load
TextBox1.Focus()
DataGridView1.SelectionMode =
DataGridViewSelectionMode.FullRowSelect
DataGridView1.EditMode =
DataGridViewEditMode.EditProgrammatically
tampilDG()
ComboBox1.SelectedIndex = 0
ComboBox2.SelectedIndex = 0
ComboBox3.SelectedIndex = 0
End Sub
Private Sub tampilDG()
adapter = New MySqlDataAdapter("SELECT * FROM tbl_tanah Order
By id", "server=localhost; user id=root; password=; database=db_spk")
table = New DataTable
adapter.Fill(table)
DataGridView1.DataSource = table

End Sub
Private Sub bersih()
TextBox1.Clear()
TextBox2.Clear()

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TextBox3.Clear()
TextBox6.Clear()
ComboBox1.SelectedIndex = 0
ComboBox2.SelectedIndex = 0
ComboBox3.SelectedIndex = 0
End Sub
Private Sub btn_simpan_Click(ByVal sender As System.Object, ByVal
e As System.EventArgs) Handles btn_simpan.Click
If TextBox1.Text = "" Or TextBox2.Text = "" Or TextBox3.Text
= "" Then
MsgBox("Kriteria belum terisi lengkap. Isi kembali!",

MsgBoxStyle.Information, "Perhatian")
Else
Try
Call konek()
Dim cmd As New MySqlCommand
cmd.CommandType = CommandType.Text
cmd.CommandText = "Insert into
tbl_tanah(namaPemilik,luasTanah,NJOP,harga_jual,tata_ruang_kota,akses
Jalan,fasilitasUmum) values ('" & TextBox1.Text & "','" &
TextBox2.Text & "','" & TextBox3.Text & "','" & TextBox6.Text & "','"
& ComboBox1.Text & "','" & ComboBox2.Text & "','" & ComboBox3.Text &
"')"
cmd.Connection = conn
cmd.ExecuteNonQuery()
MsgBox("Data Telah Tersimpan.",
MsgBoxStyle.Information, "Berhasil")
tampilDG()
Call bersih()
Catch ex As Exception
MsgBox("Gagal menyimpan data.",

MsgBoxStyle.Exclamation, "Error")
Call bersih()
TextBox1.Focus()
End Try
End If
End Sub
Private Sub Button2_Click(ByVal sender As System.Object, ByVal e
As System.EventArgs) Handles btn_batal.Click
Call bersih()
End Sub
Private Sub Button3_Click(ByVal sender As System.Object, ByVal e
As System.EventArgs) Handles btn_keluar.Click
Me.Close()
End Sub
Private Sub btn_hapus_Click(ByVal sender As System.Object, ByVal
e As System.EventArgs) Handles btn_hapus.Click
If DataGridView1.RowCount = 0 Then
MsgBox("Data tidak ada.", MsgBoxStyle.Exclamation,
"Warning")
ElseIf DataGridView1.SelectedRows.Count = 0 Then

MsgBox("Anda belum memilih data yang akan dihapus.",
MsgBoxStyle.Exclamation, "Warning")
Else

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If MsgBox("Anda akan menghapus data ini?",
MsgBoxStyle.YesNo, "Anda Yakin?") = MsgBoxResult.Yes Then
Try
Call konek()
Dim cmd As New MySqlCommand
cmd.CommandType = CommandType.Text
cmd.CommandText = "Delete FROM tbl_tanah where id
= '" & DataGridView1.SelectedCells(0).Value & "'"
cmd.Connection = conn
cmd.ExecuteNonQuery()
MsgBox("Data Telah Dihapus.",
MsgBoxStyle.Information, "Berhasil")

TextBox1.Clear()
tampilDG()
Catch ex As Exception
MsgBox("Gagal Dihapus.", MsgBoxStyle.Exclamation,
"Gagal")
End Try
Else
End If
End If
End Sub
End Class

4. Modul Koneksi

Imports MySql.Data.MySqlClient
Module koneksi
Public conn As New MySqlConnection
Public Sub konek()
If conn.State = ConnectionState.Closed Then
Dim myString As String = "server=localhost; user id=root;

password=; database=db_spk"
Try
conn.ConnectionString = myString
conn.Open()
Catch ex As Exception
MsgBox(ex.Message)
End Try
End If
End Sub
Public Sub disconnect()
Try
conn.Open()
Catch ex As Exception
End Try
End Sub
End Module

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