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Nothing like doing someones homework for them.
Congratulations!! You've now helped this person fail his class!!
I know this may seem like an odd thing to say, considering he'll use YOUR code to pass HIS little assignment. But, since HE didn't write the code, HE will have LEARNED NOTHING that he MUST LEARN in order to write code for FUTURE projects.
Again, congratulations on helping him fail...
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I think you should calm down a bit. People help each other for free on this site, and I am as entitled to offer assistance as anyone else. If you think this person is posting homework then take issue with him, not me.
Also, please don't shout at me. The forum guidelines forbids it.
Paul
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pmarfleet wrote: If you think this person is posting homework
You didn't read the OP's subject line, did you? "academic problem" screams homework.
Think about the help you're giving and why the person is asking for it before you post. Are you going to tell someone how to write a virus too?
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Even if it was a homework question I don't think that justifies the tone of your response, which was out of proprtion to the issue at hand.
Anyway, people who cheat eventually get found out, so I don't think it makes much difference in the great scheme of things.
Paul
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Dave Kreskowiak wrote: Nothing like doing someones homework for them.
What a cheat 
"Real programmers just throw a bunch of 1s and 0s at the computer to see what sticks" - Pete O'Hanlon
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Dave Kreskowiak wrote: Again, congratulations on helping him fail...
No kidding 
"Real programmers just throw a bunch of 1s and 0s at the computer to see what sticks" - Pete O'Hanlon
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The guy says that he'll give any help to anyone who wants it.
Well, what about that guy who wants to write an app that locks Windows with a password until the customer pays??
Sure, you help him out, he get the app working, then his code fails to unlock a machine after the customer pays. He then gets sued for damages, and now anyone who helped him write this code is now complicit in a, say, "scheme to defraud". Why is it so difficult to understand that you have to think before you post?!
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Dave Kreskowiak wrote: Why is it so difficult to understand that you have to think before you post?!
That is a biggie that seems to plague some people. Especially the ones that can't seem to read the forum posting guidelines at the top of the page (which actually dawns on me that there really isn't one at the top other than the message Chris puts in the top post of the forum) 
"Real programmers just throw a bunch of 1s and 0s at the computer to see what sticks" - Pete O'Hanlon
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Paul Conrad wrote: That is a biggie that seems to plague some people.
Sadly, it's as curable as Ebola.
Paul Conrad wrote: Especially the ones that can't seem to read the forum posting guidelines at the top of the page (which actually dawns on me that there really isn't one at the top other than the message Chris puts in the top post of the forum)
Even then, it doesn't show up all the time. It should really be part of the page itself.
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Actually, probably the guy will pass the class, possibly with distinctions, went on to become IT/PM manager.....
Cest la vie...
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1. Do your own homework.
2. If you get stuck in some specific code, then post and we will help.
_____________________________________________
Flea Market! It's just like...it's just like...A MINI-MALL!
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leckey wrote: 1. Do your own homework.
Well, but pmarfleet already did it for him 
"Real programmers just throw a bunch of 1s and 0s at the computer to see what sticks" - Pete O'Hanlon
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Guys do not worry about my assignment. Do not assume things that you do not know. I am just trying to get my hands on VB .NET by reading a book. Just curious to solve few things that are seen as an exercise.
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hello,
I am trying to add a new row to a dataset. I then write this changes to a xml file for local storage. However, I have noticed that when I read the xml file back into a dataset and display in the datagrid, the incidentID (PK) is NULL. The incidentID is auto incremented in the sql server database.
Am I doing something wrong?
<br />
Dim dr As DataRow<br />
dr = dsIncidents.Tables(0).NewRow()<br />
dr("Company") = Me.cboCustomer.Text<br />
dr("Contact") = Me.cboContact.Text<br />
dr("PhoneNo") = Me.txtPhone.Text<br />
dr("Priority") = Me.cboPrority.Text<br />
dr("Subject") = Me.txtSubject.Text<br />
dr("AssignedTo") = Me.cboUsers.Text<br />
dsIncidents.Tables(0).Rows.Add(dr)<br />
<br />
dsIncidents.AcceptChanges()<br />
<br />
dsIncidents.WriteXmlSchema(incidentXSD)<br />
dsIncidents.WriteXml(incidentXML, XmlWriteMode.DiffGram)<br />
<br />
Me.grdIncidents.Datasource = dsIncidents.Tables(0).DefaultView<br />
-- modified at 23:22 Thursday 13th September, 2007
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steve_rm wrote: The incidentID is auto incremented in the sql server database
Yeah, but your code never updates the database and the SQL Server will never update your XML file on it own. XML files also do not have an "auto incrementing" field. An XML file is most definately NOT a database and will disappoint anyone who expects it to act like one.
Sooo....what how does the XML file relate to the SQL Server database? How does your code interact with both of these.
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Hello Dave,
Thanks for the reply.
The user would like to use the client offline. So the client will download from the web serivce a table. This table will be saved to an xml file using the diffGram write mode.
The user will read in this xml file everytime they want to add, edit, and delete a row. These will be saved to the xml file. So at the end of the day the user will go online and synchronise the data with the central database.
However, when I do the add row, it displays the IncidentID (PK) as NULL. Which is not good as I need the incidentID when I want to edit that row.
Any suggestions would be most helpfull,
Thanks,
Steve
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why do you use an xml file for the offline part. why not just use an acces mdb that way you'll have an actual database in wich you can use sql statements. It will also improve performence.
Also when doing something like this you have to keep in mind that while you're client is working offline other users might add rows too so you can't just syncronise with the id that is stored in the offline db/xml file (unless you're client is the only user of the programme)
in answer to a question or remark that probably will follow: you can use an access db without having access installed so for you're client this will not mean that he has to purchase it.
If my help was helpfull let me know, if not let me know why.
The only way we learn is by making mistaks.
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Hello TD,
Thanks for the reply.
I am interested in the MS Access. But how can I used Access when it is not installed?
I have already started the project this way by using the xml. And now I am interested to finish it as it is a learning experience for me. If I stop now, then this is nothing to learn from not finishing.
However, this is what I am having problem with.
I wondering what is the best method to synchronise data on a local client in xml form to a central database.
The dataset will be filled by the web service returning a dataset from the central database.
<br />
ds = ws.GetIncidents()<br />
I only have one table to update and the client has to be used offline.
Once the dataset has this data, I write the schema and xml. Now the client can use this xml to update, add, and delete incidents.
<br />
ds.writeXMLSchema(path)<br />
ds.writeXML(path, XmlWriteMode.DiffGram) 'DiffGram used for tracking updates<br />
So I am make all my updates and write those changes to the xml file.
example.
<br />
Dim dr As DataRow<br />
dr = ds.Tables(0).NewRow()<br />
dr("Company") = Me.cboCustomer.Text<br />
dr("Contact") = Me.cboContact.Text<br />
dr("PhoneNo") = Me.txtPhone.Text <br />
ds.Tables(0).Rows.Add(dr)<br />
<br />
ds.AcceptChanges() 'Question - is acceptChanges needed before the new row is written to the xml file.<br />
<br />
ds.WriteXmlSchema(incidentXSD)<br />
ds.WriteXml(incidentXML, XmlWriteMode.DiffGram)<br />
'For getting the changes - read in the xml file
<br />
ds.ReadXML(path, XmlReadMode.DiffGram)<br />
IF(ds.HasChanges)THEN<br />
dim dsChanges as new Dataset()<br />
dsChanges = ds.GetChanges()<br />
End IF<br />
So dsChanges now has new changes.
This is the problem I am having problem with, as the central dataset could have deleted a row. And my client might have a modified
that row. How would I handle that sort of conflict, as the row would not exist on the central database?
Another problem I would send my dsChanges to the central database using the web service. But how would I write the code to update
the central database with my changes?
'My code for the web service to update the central database and synchronise the data
<br />
'Update the central database and return the updated dataset<br />
<WebMethod()> _<br />
Public Function SynchroniseChanges(ByVal dsChanges As DataSet) As DataSet<br />
Dim cmd As New SqlCommand()<br />
Dim da As New SqlDataAdapter()<br />
Dim ds As New DataSet<br />
<br />
Try<br />
Me.openConnection()<br />
cmd.Connection = cnn<br />
cmd.CommandType = CommandType.Text<br />
cmd.CommandText = "SELECT * FROM Incident"<br />
<br />
da.SelectCommand = cmd<br />
da.Fill(ds, "Incident")<br />
<br />
dsChanges.Merge(ds, True, MissingSchemaAction.Add)<br />
<br />
'How would I get ds to update the central database<br />
<br />
'Once all changes are made to the database return the updated dataset<br />
Return ds<br />
Catch ex As Exception<br />
Console.WriteLine(ex.Message)<br />
Finally<br />
cnn.Close()<br />
End Try<br />
Return Nothing<br />
End Function<br />
Any suggestions to the last to points would be most helpfull.
Many thanks,
Steve
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for devolepment you would need access installed but once the access database is created you can use it without office access.
for the syncronisation part you will need to set up a few rules.
in you're example (delete row on central db and edited offline)
if you're rule is that the central db has priority then discard the offline changes and move on
if you're rule is that the offline db has priority then insert the row in central db
for updating the central db:
use primary keys that can't be changed then when you update search on these key's if the key doesn't exists in the central db but does exist in the offline db then insert it in central db
if row has changed that means the row existed in central db when last syncronised so you can just update the central db
if the row has been deleted in offline db I would suggest you somehow keep track of that (boolean in offline db that's set to true or something) so that you know wich rows to delete in central db
but this all comes down to making rules and sticking to them so that's the first thing you'll need to do
If my help was helpfull let me know, if not let me know why.
The only way we learn is by making mistaks.
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TDDragon wrote: for devolepment you would need access installed
Says who?? No, you don't need it installed at all.
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perhaps I shoud have said: for making the access db you need access installed (or at least as far as I know) after that you indeed don't need it anymore
If my help was helpfull let me know, if not let me know why.
The only way we learn is by making mistaks.
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TDDragon wrote: for making the access db you need access installed
No you don't. You can create it from the Data Sources (ODBC) Administrative Tool. It cannot be done from inside Visual Studio.
Under Win2000, open Control Panels, Administrative Tools, Data Sources (ODBC). Under the User DSN's tab, User Data Sources, double click the MS Access Database line. In the dialog that opens, click the Create button, then give it the fully qualified path for the file you want to create, then click OK. You can also use the options on the right side of this dialog to set the Jet version to use and wether to create a System Database and Ecrypt it. Then just Cancel out of everything. Walla! Done. All you need to do then is add a Data Source to your Visual Studio project to point at the new file. You can then add tables, stored proc's (yeah, right!), views and functions using the Server Explorer.
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didn't know that thanks for the info
you see we learn something new every day 
If my help was helpfull let me know, if not let me know why.
The only way we learn is by making mistaks.
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It's one of those things that isn't very widely known and it's documentation is pretty obscure.
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steve_rm wrote: However, when I do the add row, it displays the IncidentID (PK) as NULL.
You have a HUGE problem, since you're code MUST tolerate this situation. XML is NOT a database and will not fill in the PK for you automatically. This PK can NOT be assigned until the record is written back to the real database. Since you can have multiple clients using their own copy of the disconnected data, you cannot have clients assigning permanent PK's on their own. Two clients will get the opportunity to assign the SAME PK to their own, different, records!! Yikes!
You'll have to come up with a scheme to generate a TEMPORARY key that you can use to connect to other records in the database, but you'll have to replace this temp key when the data is synced up to the real database.
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