C + + editor program is as follows, there is no problem, then I click on the run after chose me to access the data source, after first appeared in figure 1, I ordered after the jump in figure 2, really don't know how, please, a great god,

 # include & lt; stdio.h> 
# include & lt; Stdlib. H> 
# include & lt; Afxdb. H> 
Void main (int arg c, char * argv []) 
{
Cstrings strSql; 
CDatabase m_db; 
M_db. Open (NULL); 
CRecordset rs (& amp; M_db); 
StrSql="select * from Student"; 
Printf (" student id \ t \ \ t t name gender \ t \ n "); 
Rs. The Open (CRecordset: : forwardOnly, strSql, 0). 
while(! Rs. IsEOF ()) 
{
Cstrings strNumber; 
Cstrings strName; 
Cstrings strSex; 
Rs. GetFieldValue (Sno, strNumber); 
Rs. GetFieldValue (" Sname ", strName); 
Rs. GetFieldValue (" Ssex strSex); 

Printf (" % s \ n \ \ t t % s % s ", strNumber, strName, strSex); 
Rs. MoveNext (); 
} 
M_db. Close (); 
} 

CodePudding user response:

CodePudding user response:

CodePudding user response:

Our great god, please, have the person to help me

CodePudding user response:

What is open (Null) open database, should not be the connection string, humble opinion, not how to use VC

CodePudding user response:

The first thing to do: : CoInitialize (NULL);

CodePudding user response:

See what mistakes or add exception handling

 try 
{
//your ODBC database code 
} 
The catch (CException * pEx) 
{
PEx - & gt; ReportError (); 
PEx - & gt; The Delete (); 
} 

You built, not MFC engineering beginners do not recommend you use ODBC, ado example may have a look here,

CodePudding user response:

Didn't understand what you mean

CodePudding user response:

The first thing to do: : CoInitialize (NULL); , what is the meaning of this sentence

CodePudding user response:

You look under the Debug database operations are successful? Such as Open call place to see the return value is correct?

CodePudding user response:

Add a header file,
# include & lt; Atlbase. H>
# include & lt; Afxoledb. H>


Add code:
CoInitialize (NULL);

//initialize the OLE libraries
if (! AfxOleInit ())
{
AfxMessageBox (IDP_OLE_INIT_FAILED);
return FALSE;
}

Give it a try