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I am building an application that will require a database to store information. I am wondering what ones are available for me to use.
I like the ease of distribution of Access, just dump the file on the target machine make sure the newest MDAC is installed and of you go with ODBC calls or whatever. Problem is when I attempted to setup a database I couldn't create table or field names as whatever I liked.
I could name evrything to anything in SQL Server but it requires the files and MSDE on the target machine to run. This is annoying.
Is there a database out there that allows me to create table and fields names to anything I like, doesn't require something like MSDE to access it programatically? I wouldn't mind free as I may want to create some application in my personal time for free distribution and I don't want to break the bank doing it.
Michael Martin
Pegasystems Pty Ltd
Australia
martm@pegasystems.com
+61 413-004-018
"Don't belong. Never join. Think for yourself. Peace"
- Victor Stone
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Why couldn't you name your tables and fields in Access (=Jet) as you like? As far as I know there is little difference between Jet and SQL Server?
Cheers
Steen.
"To claim that computer games influence children is rediculous. If Pacman had influenced children born in the 80'ies we would see a lot of youngsters running around in dark rooms eating pills while listening to monotonous music"
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Have to look into it again, I tried a couple of months ago and seemed to get locked into a wizard interface that kept giving me choices of existing table and field names. Then got the sh*ts and moved onto SQL Server, just think it is overkill for any litle dinky stuff I will work on in my own time at the moment.
Michael Martin
Pegasystems Pty Ltd
Australia
martm@pegasystems.com
+61 413-004-018
"Don't belong. Never join. Think for yourself. Peace"
- Victor Stone
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Problem is when I attempted to setup a database I couldn't create table or field names as whatever I liked.
Did you try with Dao or with ADOX?.
I can to do that.....
Try with ADOX or with CDAOWorkspace, CADOTableDef, etc.
If you need samples, please let me Know.....
Best Regards!!!!
Carlos Antollini.
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My descriptive powers of the written word have failed me again, I'm a moron. What I was trying to say was -
When creating a database from within Access itself I couldn't just name the tables and fields they contained anything I wanted, a wizard kept getting in my road and pissed me off so much I went to SQL Server which was overkill.
I will pul my head in, try all this again and learn to express my question better next time.
Michael Martin
Pegasystems Pty Ltd
Australia
martm@pegasystems.com
+61 413-004-018
"Don't belong. Never join. Think for yourself. Peace"
- Victor Stone
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Hello !
Which is better ?
*** Create one ADOConnection at start point, and use it globally in program
or
*** Create an ADOConnection whenever and everywhere needed
tanks
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Create an ADOConnection whenever it's needed.
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Hello Gerald Schwab ...
your answer is good!, but Creating an ADOConnection whenever it's need, may slow down my application, isn't it ?
tanks!
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Is better to use the adoconnection like a global variable for your application, but you must open the adoconnection when you need, and leaving that connection open, for future use, and closing the connection when you close the Applictaion. But if your applictation need to use the connection every a long time, is better open the connection every time that you needm, but always leaving the connection like a global function.
Cheers....
Carlos Antollini.
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Hello Carlos Antollini ....
your answer is good, too !
but, I have problem with that when I use Transaction with Option_Explicit set to ON. In some cases i should restart my application.
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You are working with VB?
Regards!!!!
Carlos Antollini.
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Hello, Carlos Antollini !
No,... I'm working with Delphi 5.0
Regards!!!!
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I'm Sorry, I don't Know Nothing About Delphi....
But If you use the Connection like a Global Variable, You don't must to forguet to close the connection, when Close the Application. For other part, I don't Know what happens in Delphi. I'm Sorry Again....
Best Regards!!!!
Carlos Antollini.
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Hello again, Carlos Antollini !
Tanks for your helps.
Regards!!!!;)
Mehrdad.
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... trying to get a FOR XML rowset back out through ADO/ASP now, and its becoming a nightmare!
strings I select like this: SELECT '<hello/<' are just great, but something simple like:
SELECT blah
FROM blogg
FOR XML AUTO, ELEMENTS
gives me rubbish, like:
?colname??L?anothercol?a??somethingelse?andmoreshite
which isn't making much sense to me, unless its a UNICODE problem...
thanks in advance if anyone can help
Nick
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I have an ASP page in which I am trying to start a transaction
<br />
var Conn = Server.CreateObject("ADODB.Connection");<br />
Conn.Open("MyDB");<br />
Conn.BeginTrans();<br />
Conn.Execute("sp_InsertNew " + name);<br />
The stored proc, sp_InsertNew, as you would imagine just inserts a record into a table
When I try this I get the error, "Transaction cannot start while in firehose mode."
MSDN says this is a bug with SQL Server 2000 and the Enterprise Manager. The problem is I am trying this with an ASP page and ADO connection.
Can anyone shed some light on this?
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Im using ADO to access an SQL server and everything is working ok except
for when an error occurs.
Then the description and source properites in the error object is
*always* null.
The native error number is how it should be.
Anyone got a clue what could cause this?
(we also access the db with MFC and ODBC and there the description is correct)
/Magnus
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Send your code snippet so we can have a look at what you are doing wrong
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Here is the codesnippet used to get the error.
The _ConnectionPtr passed in is either the connection
pointer used to execute the command or gotten from
_RecordsetPtr->GetActiveConnection()
NativeError contains a valid number as said but all strings are NULL.
void EmitError(_ConnectionPtr piCon)
{
if(piCon == NULL)
return;
ErrorsPtr ptrErrors = piCon->Errors;
if(ptrErrors == NULL)
return;
long lCount = ptrErrors->Count;
ErrorPtr ptrError = NULL;
CString sError;
for(long n = 0; n < lCount; n++)
{
ptrError = ptrErrors->GetItem(n);
if(!(ptrError == NULL))
{
LogEmit("%s\nState: %s, Native: %d, Source: %s\n\n",
(LPCTSTR)_bstr_t(ptrError->GetDescription()),
(LPCTSTR)_bstr_t(ptrError->GetSQLState()),
ptrError->NativeError,
(LPCTSTR)_bstr_t(ptrError->GetSource())
);
}
}
}
/Magnus
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use exception handling e.g.
try
{
HRESULT hr = piCon->....;
if (FAILED(hr))
_com_issue_error(hr);
}
catch(_com_error& e)
{
CString sBuff = GetErrorDescription(e);
AfxMessageBox(sBuff);
return;
}
catch(...)
{
AfxMessageBox("Unknown Error Occured");
return;
}
CString GetErrorDescription(_com_error& e)
{
_bstr_t bstrSource(e.Source());
_bstr_t bstrDescription(e.Description());
_TCHAR szTemp[1024];
CString strInfo ;
wsprintf(szTemp, _T("Message : %s\n"), e.ErrorMessage());
strInfo = szTemp;
wsprintf(szTemp, _T("Code : 0x%08lx\n"), e.Error());
strInfo += szTemp;
wsprintf(szTemp, _T("Source : %s\n"), bstrSource.length() ? (LPCTSTR)bstrSource : _T("null"));
strInfo += szTemp;
wsprintf(szTemp, _T("Description : %s\n"), bstrDescription.length() ? (LPCTSTR)bstrDescription : _T("null"));
strInfo += szTemp;
return strInfo;
}
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I do use exception handling, thats from where a try to get the ado-errors.
The problem is not catching the error but that the description field is NULL.
I can get the HRESULT, native error,.. but that are not very friendly messages.
I dont think the code that tries to dig out the error is to blame here, the problem must lie somewhere else,.......and i dont have a clue where. 
/Magnus
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Hi all,
I'm trying to use IXMLHTTPRequest to send an XML document (from a C++ client app) to a template on a SQL Server. It appears IIS support is configured properly, because putting the document directly in the url works - like this:
http://myserver/virtualdir/templates/mytemplate.xml?doc='<root/>'
The template is:
<ROOT xmlns:sql='urn:schemas-microsoft-com:xml-sql'>
<sql:header>
<sql:param name='doc'>'default'</sql:param>
<sql:header>
<sql:query>
exec usp_MySP @doc
</sql:query>
<ROOT>
In code, I open an IXMLDOMDocument, and load xml into it. Then, I open an IXMLHTTPRequest and send the document:
hr = pIXMLHttpRequest->open(_bstr_t(_T("POST")),
_bstr_t(_T("http://myserver/virtualdir/templates/mytemplate.xml")),
_variant_t(VARIANT_FALSE),
_variant_t(""), _variant_t(""));
hr = pIXMLHttpRequest->setRequestHeader(_bstr_t(_T("Content-type")),
_bstr_t(_T("application/xml")));
hr = pIXMLHttpRequest->send((IDispatch *)pDoc);
The stored procedure always gets the default parameter, not whatever document I pass in.
Thanks for any help with this cryptic stuff
Cheers
NB
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How can I check if MDAC is installed on the machine in Visual C++ ?
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There's a registry key HKEY_CLASSES_ROOT\MDACVer.Version with a subkey CurVer with the value like MDACVer.Version.2.60.
I don't know if all MDAC version supports this key.
Volker
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use this code on ::InitInstance
CLSID clsid;
HRESULT hr = AfxGetClassIDFromString("Datalinks", &clsid);
if(!SUCCEEDED(hr))
{
AfxMessageBox("You need to install MDAC v2.1 or higher");
return FALSE;
}
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