Re: Why I cannot have a ListControl in a CRecordView derived class? - C / C++ / MFC Discussion Boards

Re: Why I cannot have a ListControl in a CRecordView derived class?

«_Superman_»29-Nov-09 8:45

«_Superman_»

29-Nov-09 8:45

Set a breakpoint in OnInitialUpdate and single step into SetColumsIngred.

«_Superman_»
I love work. It gives me something to do between weekends.

Microsoft MVP (Visual C++)

Re: Why I cannot have a ListControl in a CRecordView derived class?

Larry Mills Sr29-Nov-09 13:07

Larry Mills Sr

29-Nov-09 13:07

I did that already. That's how I know where if crashes. I crashes on the three lines I indicated above.

A C++ programming language novice, but striving to learn

Re: Why I cannot have a ListControl in a CRecordView derived class?

David Crow29-Nov-09 15:57

David Crow

29-Nov-09 15:57

Does the list control window exist at this point?

"One man's wage rise is another man's price increase." - Harold Wilson

"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons

Re: Why I cannot have a ListControl in a CRecordView derived class?

Larry Mills Sr1-Dec-09 3:01

Larry Mills Sr

1-Dec-09 3:01

Yes!

A C++ programming language novice, but striving to learn

Re: Why I cannot have a ListControl in a CRecordView derived class?

David Crow1-Dec-09 3:04

David Crow

1-Dec-09 3:04

So then what's the error?

Re: Why I cannot have a ListControl in a CRecordView derived class?

Larry Mills Sr2-Dec-09 2:35

Larry Mills Sr

2-Dec-09 2:35

David it doesn't give an error, it just crashes.

A C++ programming language novice, but striving to learn

Re: Why I cannot have a ListControl in a CRecordView derived class?

David Crow2-Dec-09 2:42

David Crow

2-Dec-09 2:42

Larry Mills Sr wrote:
...it just crashes.

Assertion, exception, what?

Re: Why I cannot have a ListControl in a CRecordView derived class?

Larry Mills Sr2-Dec-09 15:05

Larry Mills Sr

2-Dec-09 15:05

//This crashes because as you indicated the window has not been created yet:
void CCookItDBView::OnInitialUpdate()
{
     m_pSet = &GetDocument()->m_CookItDBSet;
     SetColumsIngred();
     CRecordView::OnInitialUpdate();
}

// THIS IS CORRECT   IT WORKS NOW
void CCookItDBView::OnInitialUpdate()
{
     m_pSet = &GetDocument()->m_CookItDBSet;
     CRecordView::OnInitialUpdate();
     SetColumsIngred();
}

I didn't understand you previous comment until in debug I caught it.

Thanks David.

Question: I have several "Tables" in the database that hopefully will point me to data contained in other tables that are not presently linked in the RecordSet. For example: Table "RecipeData" is not linked in the RecordSet (I didn't select it when I selected the Tables) can I still do this:   CString str = m_pSet->[RecordDate].Recipe;

A C++ programming language novice, but striving to learn

Re: Why I cannot have a ListControl in a CRecordView derived class?

David Crow2-Dec-09 17:44

David Crow

2-Dec-09 17:44

Yes, you can reference whatever tables you want in the GetDefaultSQL() method. Make sure that the fields in the query match the order of the associated variables in the DoFieldExchange() method.

Re: Why I cannot have a ListControl in a CRecordView derived class?

Larry Mills Sr3-Dec-09 14:58

Larry Mills Sr

3-Dec-09 14:58

David,
I tried to write to the DB and I get an error "The RecordSet is read only." How do I change that?

A C++ programming language novice, but striving to learn

Re: Why I cannot have a ListControl in a CRecordView derived class?

David Crow3-Dec-09 15:58

David Crow

3-Dec-09 15:58

If your query is joining multiple tables, it cannot be updated (i.e., read-only).

Re: Why I cannot have a ListControl in a CRecordView derived class?

Larry Mills Sr4-Dec-09 2:51

Larry Mills Sr

4-Dec-09 2:51

So how do I update, ie Read, Write or delete an individual table's record. Do I have to create a DSN for each table or what?

A C++ programming language novice, but striving to learn

Re: Why I cannot have a ListControl in a CRecordView derived class?

David Crow4-Dec-09 7:48

David Crow

4-Dec-09 7:48

Larry Mills Sr wrote:
So how do I update, ie Read, Write or delete an individual table's record.

Yes. Those tables should all be linked together via a primary/foreign key.

Larry Mills Sr wrote:
Do I have to create a DSN for each table or what?

No, but you may end up with several recordset classes.

Re: Why I cannot have a ListControl in a CRecordView derived class?

Larry Mills Sr4-Dec-09 8:02

Larry Mills Sr

4-Dec-09 8:02

David,
I don't understand your response. The tables are all loaded, but I cannot write or delete any records in them. How exactly do I write to one of the tables to add a new record? How dom I set CanUpdate() and CanAppend() to TRUE.
Nowhere in the Wizzard supplied Recordset class is there an "Open(....)" statement so I can change anything, so just how do I get to write tothe database?

A C++ programming language novice, but striving to learn

Re: Why I cannot have a ListControl in a CRecordView derived class?

David Crow4-Dec-09 9:06

David Crow

4-Dec-09 9:06

Larry Mills Sr wrote:
...but I cannot write or delete any records in them

Make sure the DSN, the CDatabase object, and the CRecordset object are all opened correctly (i.e., non read-only).

Larry Mills Sr wrote:
How exactly do I write to one of the tables to add a new record?

Use the CRecordset::AddNew() followed by CRecordset::Update().

Larry Mills Sr wrote:
Nowhere in the Wizzard supplied Recordset class is there an "Open(....)" statement...

See here.

While it does not do any updating, you might check out this[^] article.

Re: Why I cannot have a ListControl in a CRecordView derived class?

Larry Mills Sr4-Dec-09 13:52

Larry Mills Sr

4-Dec-09 13:52

David Crow wrote:
Make sure the DSN, the CDatabase object, and the CRecordset object are all opened correctly (i.e., non read-only).

David, that's what I'm trying to found out how to do!

All I've done since the the Wizard create the Recordset class is compile the program, which did so correctly. Am I supposed to do a database "Open(....) statement somewhere. I didn't see that in your I "Invoice" program anywhere.

I simply don't know what to do at this point.
Help please!

A C++ programming language novice, but striving to learn

Re: Why I cannot have a ListControl in a CRecordView derived class?

David Crow7-Dec-09 2:59

David Crow

7-Dec-09 2:59

Larry Mills Sr wrote:
David, that's what I'm trying to found out how to do!

Does the query contain any JOINs?

Larry Mills Sr wrote:
Am I supposed to do a database "Open(....) statement somewhere.

It's not necessary since CRecordset also has an Open() method.

Re: Why I cannot have a ListControl in a CRecordView derived class?

Larry Mills Sr7-Dec-09 5:13

Larry Mills Sr

7-Dec-09 5:13

David, I don't do any SQL statements. I'm supposing the recordset is initialized properly on execution. It does read fine(the data is in the varables. But it will NOT allow me to write a record to the database. I did this:
BOOL B = m_pSet->CanAppend(); and BOOL f = m_pSet->CanUpdate(); and both show "0" values.
I don't know how to make it "CRecordset::none" which is supposed to make it writable, but it doesn't. Another thing, in using Windows Explorer I right click on the folder and the "Read Only" box is filled in; I clear it and click the applly button, I select the apply to subfolders and files and click "OK" and no activity is shown I click "OK" and immediately click on property again and "Read Only" is again filled in. I go through the same thing again with the same results. I am the only User of this computer and all listed Users(ie, SYSTEM, Administrator, User all have "Full Control" security selected. What gives?

A C++ programming language novice, but striving to learn

Re: Why I cannot have a ListControl in a CRecordView derived class?

David Crow7-Dec-09 5:27

David Crow

7-Dec-09 5:27

Larry Mills Sr wrote:
David, I don't do any SQL statements.

In your CRecordset-dervied class, what does the GetDefaultSQL() method look like?

Are you using a DSN? If so, have you checked it for any "read only" properties?

Are you calling CDatabase::Open()? If so, what is the third argument being sent to it?

Re: Why I cannot have a ListControl in a CRecordView derived class?

Larry Mills Sr7-Dec-09 5:35

Larry Mills Sr

7-Dec-09 5:35

Here's the code:

CString CMyDB::GetDefaultConnect()
{
     return _T("DBQ=C:\\CookIt\\Program\\DataBases\\DB\\CookIt.mdb;DefaultDir=C:\\CookIt\\Program\\DataBases\\DB;Driver={Driver do Microsoft Access (*.mdb)};DriverId=25;FIL=MS Access;FILEDSN=C:\\CookIt\\Program\\DataBases\\DB\\CookIt.mdb.dsn;MaxBufferSize=2048;MaxScanRows=8;PageTimeout=5;SafeTransactions=0;Threads=3;UID=admin;UserCommitSync=Yes;");
}

CString CMyDB::GetDefaultSQL()
{
     return _T("[ApeData],[BreadData],[CakeData],[CandyData],[CookieData],[DrinkData],[FruitData],[MeatData],[PastryData],[PieData],[PudData],[Recipe],[SaladData],[SauceData],[SelRecipe],[SoupData],[Special2Pg1],[Special2Pg2],[Special2Pg3],[Special2Pg4],[Special2Pg5],[Special2Pg7],[SpecialPg1],[SpecialPg2],[SpecialPg3],[SpecialPg4],[SpecialPg5],[SpecialPg6],[SpecialPg7],[VegData]");
}

Here's some more code:

void CCookItDBView::OnInitialUpdate()
     {
     m_pSet = &GetDocument()->m_CookItDBSet;

     m_pSet->Open(CRecordset::dynaset,0,CRecordset::none );
     BOOL B = m_pSet->CanAppend();
     BOOL e = m_pSet->CanUpdate();
            }

Yes I am using DSN and no I don't use a CDatabase object(because I don't know how)

I don't know whaqt to put in the Cdatabase.Open(...,...,...) statement.
I checked carefully when I did the "add class" and OBDC dialog and the "Read Only" box was left unselected as was the "Execute" box

A C++ programming language novice, but striving to learn

Re: Why I cannot have a ListControl in a CRecordView derived class?

David Crow7-Dec-09 8:49

David Crow

7-Dec-09 8:49

Larry Mills Sr wrote:
CString CMyDB::GetDefaultConnect()
{
return _T("DBQ=C:\\CookIt\\Program\\DataBases\\DB\\CookIt.mdb;DefaultDir=C:\\CookIt\\Program\\DataBases\\DB;Driver={Driver do Microsoft Access (*.mdb)};DriverId=25;FIL=MS Access;FILEDSN=C:\\CookIt\\Program\\DataBases\\DB\\CookIt.mdb.dsn;MaxBufferSize=2048;MaxScanRows=8;PageTimeout=5;SafeTransactions=0;Threads=3;UID=admin;UserCommitSync=Yes;");
}

This looks odd. Mine always have the form:

return _T("ODBC;DSN=Gymnastics");

All of those other values (e.g., database, sizes) are defined in the DSN itself.

In my CDocument class, I have a CDatabase object. Anytime I need access to it, I use:

CDatabase *CMyDoc::GetDatabase( void )
{
    if (! m_rDatabase.IsOpen())
        m_rDatabase.Open(NULL, NULL, FALSE, _T("ODBC;DSN=Gymnastics"));
  
    return (&m_rDatabase);
}

When I want to add to a table, I use:

CMyRecordset set;
set.m_pDatabase = GetDocument()->GetDatabase();
  
TRY
{
    set.Open();
    set.AddNew();
    ...
    set.Update();
    set.Close();
}
CATCH(CDBException, pDBException)
{
    AfxMessageBox(pDBException->m_strError);
}
END_CATCH

Re: Why I cannot have a ListControl in a CRecordView derived class?

Larry Mills Sr7-Dec-09 13:30

Larry Mills Sr

7-Dec-09 13:30

I copied that stuff from my program. That's the stuff the wizard produced. I am using VS2008 completely updated.
the MS Access database is called "CookIt.mdb" and with the DSN iit is now "CookIt.mdb.dsn" Is this normal? Now, you state you have a CDatabase in Documents. Do I declare it in the Header? and how do I get the CRecordset m_pSet set to that database? I may be asking this wrong.

The wizard created a CRecordset class called MyDB(I renamed it). How does the database you created in CMyDoc use the recordset that the wizard created?

You wrote: m_rDatabase.Open(NULL, NULL, FALSE, _T("ODBC;DSN=Gymnastics"));

so if I used your code would mine be: m_rDatabase.Open(NULL, NULL, FALSE, _T("ODBC;DSN=CookIt")); Is this right?

A C++ programming language novice, but striving to learn

Re: Why I cannot have a ListControl in a CRecordView derived class?

David Crow8-Dec-09 3:24

David Crow

8-Dec-09 3:24

Larry Mills Sr wrote:
the MS Access database is called "CookIt.mdb" and with the DSN iit is now "CookIt.mdb.dsn" Is this normal?

I don't think so.

Larry Mills Sr wrote:
Now, you state you have a CDatabase in Documents. Do I declare it in the Header?

Yes, just like you would any other member variable.

Larry Mills Sr wrote:
and how do I get the CRecordset m_pSet set to that database? I may be asking this wrong.

The constructor.

Larry Mills Sr wrote:

so if I used your code would mine be: m_rDatabase.Open(NULL, NULL, FALSE, _T("ODBC;DSN=CookIt")); Is this right?

It looks right.

Re: Why I cannot have a ListControl in a CRecordView derived class? [modified]

Larry Mills Sr7-Dec-09 14:05

Larry Mills Sr

7-Dec-09 14:05

I used your code and it says:
m_rDatabase.Open(NULL, NULL, FALSE, _T("ODBC;DSN=CookIt.mdb.dsn"));
"file not found"
if change it to:
m_rDatabase.Open(NULL, NULL, FALSE, _T("ODBC;DSN=c:\\CookIt\\Program\\DataBases\\DB\\CookIt.mdb.dsn"));
and it gave error: "Data Source name toog long and not found"

I finally put the original under GetDefaultConnect(). Id gave an error of "ODBC does not support dynsets"
the database was created as 2003 and I used the driver 6.001 which is supposed to work on either dynasets or snapshots? any ideas?

I re-created the Recordset this time I selected "snapshot".
Now it says "Recordset is read Only"? I don;t understand this!

A C++ programming language novice, but striving to learn

modified on Monday, December 7, 2009 8:32 PM

Re: Why I cannot have a ListControl in a CRecordView derived class?

David Crow8-Dec-09 3:20

David Crow

8-Dec-09 3:20

Larry Mills Sr wrote:
m_rDatabase.Open(NULL, NULL, FALSE, _T("ODBC;DSN=CookIt.mdb.dsn"));

What name did you give the DSN when you created it?

You get there using either

Start --> Administrative Tools --> Data Sources (ODBC)

Or by typing odbccp32.cpl in the Run box.

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.