Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p> I would change the whole approach to exceptions and errors:</p> <ul> <li>Create a new assembly (project) and reference it in your application</li> <li>Declare new shared events which accept your personal datatype (referenced assembly)</li> <li>Declare at least one shared function (referenced assembly) which does a RaiseEvent on your new events</li> <li>Add handlers (main application) for your shared events in which you react accordingly</li> <li>Call your function from within the main application, passing your own parameters whenever you need to throw errors / exceptions</li> </ul> <p>This way you circumvent many programming mistakes <strong>and</strong> centralize error and exception-handling.</p> <pre class="lang-vb prettyprint-override"><code>Public Module IDENTIFIERS Public Enum EvtMsg ERR_MYERR ERR_MYERR2 End Enum Public Enum EvtClass EXCEPTION ERR End Enum End Module Public Class Events Shared Event Err(ByVal code As EvtMsg) Shared Event Exception(ByRef iEx As Exception) Public Shared Sub Raise(ByVal iEvtClass As EvtClass, ByVal iMsg As EvtMsg, Optional ByRef iEx As Exception = Nothing) If Not [Enum].IsDefined(GetType(EvtClass), iEvtClass) Then Dim ex As New ArgumentOutOfRangeException("unbekannte Event-Klasse '" &amp; iEvtClass.ToString &amp; "' übergeben", "iEvtClass") RaiseEvent Exception(ex) End If If Not [Enum].IsDefined(GetType(EvtMsg), iMsg) Then Dim ex As New ArgumentOutOfRangeException("unbekannte Event-Msg '" &amp; iMsg.ToString &amp; "' übergeben", "iMsg") RaiseEvent Exception(ex) End If Select Case iEvtClass Case EvtClass.ERR RaiseEvent Err(iMsg) Case EvtClass.EXCEPTION If iEx IsNot Nothing Then RaiseEvent Exception(iEx) Else Dim ex As New MissingFieldException("Raise() ohne Exception aufgerufen, iMsg : " &amp; iMsg &amp; "EvtClass : " &amp; iEvtClass.ToString(), "iEx") RaiseEvent Exception(ex) End If End Select End Sub End Class </code></pre> <p>And now you can easily use these error-handlers in any assembly which references your error-assembly:</p> <h2>Constructor</h2> <pre class="lang-vb prettyprint-override"><code>AddHandler Events.Err, AddressOf Err AddHandler Events.Exception, AddressOf Except </code></pre> <h2>Class-body</h2> <pre class="lang-vb prettyprint-override"><code>Private Sub Except(ByRef iEx As Exception) 'do your stuff here End Sub Private Sub Err(ByVal Err As EvtMsg) 'do your stuff here End Sub </code></pre>
    singulars
    1. This table or related slice is empty.
    1. POVB.NET exception handling for something that returns a data set instead of a string
      singulars
      1. PTQuestion
    1. PTAnswer
    1. USPeter Mortensen
    1. USspecializt
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload