Item removing from MySQL via Visual Basic

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 & ";"


    conn.Open() ' open connection

        ' 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
            ' Confiramtion for user
            ' -------------------------------------------------
            MsgBox("Location '" & fmMain.txtOPCJETornadoLokacja.Text & "' has been removed.", vbInformation, "Confirmation...")
            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...")

    Call modDBgrid.IloscTornado   ' DataGridView refresh
End Try

End Sub

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