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Presentazione a cura di Claudia Neri 4c Mercurio (indirizzo programmatori)  2008/2009 I.s.i.s.t Russell-Newton Scandicci (Firenze)
Visual Basic ,[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],Primo passo: progettare la form
ComboBox: contenete gli iscritti Permette di visualizzare i dati dell’iscritto E adesso prima di spiegare cosa fanno questi pulsanti vediamo cosa succede nella form_load e al clic di visualizza
Iniziamo a vedere la form_load… Private Sub Form_Load() Call caricaCombo cmdRegistra.Enabled = False cmdModifica.Enabled = False cmdElimina.Enabled = False End Sub
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Ecco cosa c’è nella sottoprocedura caricaCombo In questa fase viene caricata la combobox con i nomi degli iscritti del database Si imposta a –1 perché così parte con nessun nome visualizzato
..e al clic di Visualizza ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Ed ecco cosa succede nella sottoprocedura visDatiIscritto ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Cominciamo adesso con il pulsante Elimina ,[object Object],[object Object],Vediamo in visual basic
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Per prima cosa ci si domanda se si vuole davvero eliminare. Qui si guarda se è stato confermato o meno e si utilizza un numero perché la risposta alla domanda viene memorizzata attraverso un numero.
Passiamo adesso al pulsante modifica ,[object Object],Private Sub cmdModifica_Click() fraDati.Enabled = True cmdElimina.Enabled = False txtCodIsc.Enabled = False txtCognome.SetFocus End Sub
Ecco il pulsante registra ,[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Adesso vediamo come facciamo ad aggiungere un nuovo iscritto ,[object Object],[object Object],Dobbiamo adesso modificare alcune istruzioni nel codice di alcuni pulsanti già utilizzati vediamo come….
Le modifiche del pulsante visualizza ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Nel visualizza abbiamo aggiunto il se che guarda se la riga selezionata della combobox è vuota, se ciò è vero allora cambia la caption al pulsante registra e attiva tutte le text per poter aggiungere i dati del nuovo iscritto
Le modifiche nel pulsante registra ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Si è aggiunto un se in modo da verificare quando nella combobox è selezionata la riga vuota  o no.  Infatti se è selezionata la riga vuota  deve eseguire l’istruzione di aggiungere nella tabella un nuovo iscritto altrimenti deve solo consentire di aggiungere le modifiche a un iscritto già presente
[object Object],[object Object]

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Presentazione cancellazione registrazione modifica di un record in visual basic

  • 1. Presentazione a cura di Claudia Neri 4c Mercurio (indirizzo programmatori) 2008/2009 I.s.i.s.t Russell-Newton Scandicci (Firenze)
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  • 4. ComboBox: contenete gli iscritti Permette di visualizzare i dati dell’iscritto E adesso prima di spiegare cosa fanno questi pulsanti vediamo cosa succede nella form_load e al clic di visualizza
  • 5. Iniziamo a vedere la form_load… Private Sub Form_Load() Call caricaCombo cmdRegistra.Enabled = False cmdModifica.Enabled = False cmdElimina.Enabled = False End Sub
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