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Am I to understand that each of the objects in your database will move from one table to tbe next when it changes state? I don't think that is good design. I'd rather go for one table that holds all objects, with an extra field indicating its state (inventory, lost, repair, whatever). And when more info needs be stored in a state-dependent way, then add that in separate tables.
Doing so, I expect fewer problems and less code.
Furthermore, you may want to keep track of the states an object has been in. That would allow you to answer questions such as: how often has an object been repaired? What is the average time span between repairs for objects needing multiple repairs? etc.
Luc Pattyn [Forum Guidelines] [My Articles] Nil Volentibus Arduum
Please use <PRE> tags for code snippets, they preserve indentation, improve readability, and make me actually look at the code.
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Hi
Ok. I have armory table (armory_id, inv_id, lost_id, repair_id)
When I do a view on this table, if one of the fk. Key is missing. I get no result, here lies my problem. If I can get this solves, I really would like to tackle on those questions you mentioned
I thank you for your walkthrough on this one.
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I'm still confused. In my world each object would have a unique and constant ID, and all those pretty similar objects would sit in a single table. They could change state, get extra information in other tables, but they would not move out of the primary table, and they would not change their ID. If that is the model you want but not currently have, you would need:
1.
some run-once code to make sure the above invariant holds true; it would look for entries in other tables that are not currently present in the main table.
2.
a thorough check of all code to make sure the invariant is maintained, so objects don't move out of the primary table ever again.
Luc Pattyn [Forum Guidelines] [My Articles] Nil Volentibus Arduum
Please use <PRE> tags for code snippets, they preserve indentation, improve readability, and make me actually look at the code.
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Yes I am sensing that I need to change my current model but I am bit off line with my table structure.
Main table is armory(armory_id, inv_id, lost_id,repair_id)
Would it be instead (armor_id, inv_id, lostcheckbox, repaircheckbox)
That would give me the state of a particular serail no)
Then I can load its record from the current state.
Thanks
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I don't know what information you want to store, and what search operations you are going to need, so I can only gamble a bit. Maybe this:
armory(armory_id, current_state, armory_description)
actions(action_id, armory_id, action_start, action_end, action_description)
Note there are no links from armory to actions!
and current_state would be an enum with possible values: normal, lost, in repair, ...
one could argue current_state is redundant, it should always match the outcome of the last action.
both tables would only be allowed to grow, and probably actions with same armory_id should not overlap time wise.
Luc Pattyn [Forum Guidelines] [My Articles] Nil Volentibus Arduum
Please use <PRE> tags for code snippets, they preserve indentation, improve readability, and make me actually look at the code.
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I thank you very much I work on it and I will check back with you.
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Hi,
I thank you for your assistance. things work fine. I would like to improve in software development skills. Will you guide me on that? I would really appreciate that.
Also, if possible I like to estblish a technical correspondent with you.
Here my email: wnmichaud@yahoo.com
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Hi,
I'm glad you're making progress.
I suggest you study by reading books and on-line articles (such as on the CP site), and ask questions in the appropriate forums here; that way you get fast and multiple replies, something no single person can offer. I'll typically will be one of the repliers in many of the CP forums.
PS 1: Publishing your e-mail address isn't a good idea, bots will catch it and send you spam.
PS 2: You can express your opinion about the replies by voting them up or down...; that helps in setting a person's reputation.
Luc Pattyn [Forum Guidelines] [My Articles] Nil Volentibus Arduum
Please use <PRE> tags for code snippets, they preserve indentation, improve readability, and make me actually look at the code.
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Hi Luc,
I have another issue I like to tackle on.
I like to have a session log off on the said project we discussed.
If the user does not perform any click, let's say during 10 minutes , automatic log off, revert back to the login page.
Thanks,
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Hi Waner,
I don't know the answer, however I trust a little Google action should provide a few ideas and perhaps code examples as well.
Luc Pattyn [Forum Guidelines] [My Articles] Nil Volentibus Arduum
Please use <PRE> tags for code snippets, they preserve indentation, improve readability, and make me actually look at the code.
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You could use LEFT JOIN instead of INNER JOIN between the tables. Just rewrite the SQL query behind your view.
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Hi I am new to Visual Basic programming, I am presently working in vb6..... I need to do the following operation.
I have a global variable, which is a flag. I have a timer which will set this flag after certain amount of time. I also have a function, which has a for loop. Inside this loop it will check whether the flag is set or not. If it is set it comes out of the loop or else it will do some operation for a certain number of times.
Is this possible in Visual Basic 6.0
I tried it but the timer is not waking up after its interval is reached or the Vb is hanging...
'''''''''''''''''''Code
Public g_TimeOut As Boolean
Private Declare Sub Sleep Lib "kernel32" (ByVal dwMilliseconds As Long)
Private Sub Timer1_Timer()
g_TimeOut = True
Timer1.Enabled = False
End Sub
Private Function Testing(nCount As Integer) As Integer
Dim index As Integer
Dim flag As Boolean
flag = False
index = 0
For index = 0 To nCount
If (g_TimeOut = True) Then
Debug.Print "Got the signal from the timer so ending the counter"
flag = True
Exit For
Else
Debug.Print "Still Counting...." & index
Sleep 1000
End If
Next index
If (flag = True) Then
Debug.Print "Did not got the signal, still ending the counter."
End If
End Function
Private Sub Form_Load()
Timer1.Interval = 5000
Timer1.Enabled = True
Testing (10)
End Sub
modified on Wednesday, February 16, 2011 1:42 AM
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My first thought was:
In your timer event -> timer1.enabled = false
this deactivates your timer
Now I tried what Aslam told you, and it works.
I cannot remember: What did I before google?
modified on Wednesday, February 16, 2011 3:47 AM
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Vb is hanging?
Try this code:
For index = 0 To nCount
If (g_TimeOut = True) Then
Debug.Print "Got the signal from the timer so ending the counter"
flag = True
Exit For
Else
Debug.Print "Still Counting...." & index
DoEvents
Sleep 1000
End If
Next index
If nCount<5 then the timer is useless.
If (flag = True) Then
Debug.Print "Did not got the signal, still ending the counter."
End If
Here the condition: flag = True False. True means Got the signal.
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If you're new to VB, abandon VB6 now before you learn too many bad habits. VB6 is dead and hasn't been supported by Microsoft for quite a long time.
Pickup VB.NET instead, or C#, and learn that. You can get the Express (Free) editions of VB.NET or C# here[^].
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Thanks Aslam,Thomas,Dave
did not see that flag = True mistake(did a silly mistake), ya corrected it. Also after putting DoEvents its working now. But its entering the timer1 function 2 times. I am getting the output like this
Still Counting....0
Still Counting....1
Still Counting....2
Still Counting....3
Still Counting....4
Still Counting....5
Inside the Timer
Got the signal from the timer so ending the counter
Got the signal from the timer so ending the counter
Inside the Timer
@Dave - I need to do some enhancements to an already existing VB6 project. For that only I am trying this.
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Why not converting your entire project into VB.NET?
You can do that by creating subsystems.
One by one convert them if you can’t convert entire system at once.
A lot of tools around the world to convert from 1 language to other.
Try this one:
vbconversions[^]
I found it useful.
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This idea would be ok ... but there are two reasons why we didn´t:
1) The rest of the company only uses C#. So the .NET parts I have to write are in C# (which I like very much). If I only talk about VB.NET they scream "heresy".
2) Beside that, the code base I´m working on is quite large, and .... ugly (= evolved over more than 12 years, there were a lot of changes). Converting this to VB.NET would only result in having a big bunch of ugly .NET code. Not really better!
I cannot remember: What did I before google?
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Here's a "technical" reason: Windows 8 won't support the VB6 runtime.
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That would be nice: Than we will gain a lot of money to convert it 
Can we be shure (Win8->noVB)?
I cannot remember: What did I before google?
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Yes, Microsoft has come out and said they will not support the VB6 runtime beyond Windows 7.
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DoEvents is the devil. It may cause event handlers (that contain DoEvents calls) do become re-entered. If you think you need DoEvents, what you probably need is another thread.
And no I don't have VB examples.
Luc Pattyn [Forum Guidelines] [My Articles] Nil Volentibus Arduum
Please use <PRE> tags for code snippets, they preserve indentation, improve readability, and make me actually look at the code.
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Hi all,
I managed to add a RSS subscription to Outlook 2010 by code:
Private Sub addRSS_subscription()
Dim myApplication As New Outlook.Application
Dim feedUrl As String = "outlookfeed://www.nu.nl/feeds/rss/algemeen.rss%23"
Dim myMAPInameSpace As Outlook.NameSpace = myApplication.GetNamespace("MAPI")
Dim ImportRSS As Outlook.Folder
ImportRSS = myMAPInameSpace.OpenSharedFolder(feedUrl, "Nu.nl RSS", True, True)
End Sub
The thing I don't know how to handle, is to change the delivery location of added RSS subscription from RSS folder to my inbox.
Anyone know how to do this.
Kind regards.
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- I completely agree with your opinion concerning VB6. Unfortunately the VB6 App I´m working on is quite suitable, and the customer is uneager to pay a lot of money only for "technical" reasons.