In the project I still making I’m using MySQL database to storing items. We can remove items from database. How to remove item from MySQL via Visual Basic?
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In order to remove item from MySQL table following query has to be used:
DELETE FROM TableName WHERE DB_ColumnName='YourRecord';
Following code is consisted of:
- MySqlConnection – connection to MySQL database,
- MySqlDataAdapter – query to MySQL,
- Try – trying open connection,
- Exception – error handling.
Whole code to connect MySQL database and remove some item:
Imports MySql.Data.MySqlClient
Public Sub UsunLokacje()
' Item removing from MySQL database
Dim dTableCount As Long
Dim dTable1 As New DataTable
'1. Connection data
'-------------------------------------
Dim conn As MySqlConnection = New MySqlConnection() ' forgot source
conn.ConnectionString = "Data Source=" & fmMain.txtMYSQLpath.Text & "; Database=" & fmMain.txtOPCJEnazwaMYSQL.Text & _
"; Uid=root; Pwd=" & fmMain.txtOPCJEhasloMYSQL.Text & ";"
Try
conn.Open() ' open connection
Try
' Checking if item is in table
' -----------------------------------------
Dim adapter As MySqlDataAdapter = New MySqlDataAdapter("SELECT * FROM nazwylokacji WHERE Lokacja='" & _
fmMain.txtOPCJETornadoLokacja.Text & "';", conn)
adapter.Fill (dTable1)
dTableCount = dTable1.Rows.Count
If dTableCount > 0 Then
' Item removing
' ---------------------------------
Dim cmd1 As MySqlCommand = New MySqlCommand("DELETE FROM nazwylokacji WHERE Lokacja='" & _
fmMain.txtOPCJETornadoLokacja.Text & "';", conn)
cmd1.ExecuteNonQuery() 'usuwanie wartości z MySQL
cmd1 = Nothing
conn.Close()
' Confiramtion for user
' -------------------------------------------------
MsgBox("Location '" & fmMain.txtOPCJETornadoLokacja.Text & "' has been removed.", vbInformation, "Confirmation...")
Else
MsgBox("Location can't be removed: '" & fmMain.txtOPCJETornadoLokacja.Text & "'.", vbCritical, "Error...")
End If
Catch ex1 As Exception
MsgBox("Error when location removing. Table: 'nazwylokacji'." + Chr(10) + Chr(10) + "Err no.:" + Chr(10) + ex1.Message, _
MsgBoxStyle.Critical, "Error...")
End Try
Catch ex As Exception
MsgBox("Database connection problem. Table: 'nazwylokacji'." + Chr(10) + Chr(10) + "Kod błedu:" + Chr(10) + ex.Message, _
MsgBoxStyle.Critical, "Conenction error...")
conn.Close()
Finally
conn.Dispose()
fmMain.txtOPCJETornadoLokacja.Clear()
Call modDBgrid.IloscTornado ' DataGridView refresh
End Try
End Sub
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