Solved

Accessing MS Access database through MS Visual C++ 6

Posted on 2000-03-08
3
252 Views
Last Modified: 2010-04-02
Hi,

I'm writing a program in C++ that will retrieve and store data from a MS Access database. Any pointer on how to set up the connectivity and retrieving and modifying the data ?
0
Comment
Question by:n_chai
  • 2
3 Comments
 
LVL 5

Accepted Solution

by:
Wyn earned 100 total points
ID: 2599338
You can use ODBC with sqlbase APIs
QUOTED:
class CDemoODBC
{
public:
CDemoODBC();
~CDemoODBC();

bool Init();

bool ConnectToDatabase( const char* dataSourceName, const char* databaseUser, const char* databasePassword );
void DisconnectFromDatabase();

bool Save( const char* paino, const char* halkaisija );

protected:
private:
CDemoODBC( const CDemoODBC& copyFrom );
CDemoODBC& operator=( const CDemoODBC& copyFrom );

void Close();

// data
public:
protected:
private:
HENV envHandle;
HDBC connHandle;
bool connectedODBC;
HSTMT statementHandle;
};



CDemoODBC::CDemoODBC()
: envHandle( SQL_NULL_HENV ),
connHandle( SQL_NULL_HDBC ),
connectedODBC( false ),
statementHandle( SQL_NULL_HSTMT )
{
}

CDemoODBC::~CDemoODBC()
{
DisconnectFromDatabase();

Close();
}

// -------------------------------------

bool CDemoODBC::Init()
{
if ( ::SQLAllocEnv( &envHandle ) == SQL_SUCCESS )
{
if ( ::SQLAllocConnect( envHandle, &connHandle ) == SQL_SUCCESS )
{
::SQLSetConnectOption( connHandle, SQL_LOGIN_TIMEOUT, 5 );

return true;
}
}

return false;
}

void CDemoODBC::Close()
{
if ( connHandle != SQL_NULL_HDBC )
{
::SQLFreeConnect( connHandle );
connHandle = SQL_NULL_HDBC;
}

if ( envHandle != SQL_NULL_HENV )
{
::SQLFreeEnv( envHandle );
envHandle = SQL_NULL_HENV;
}
}

bool CDemoODBC::ConnectToDatabase( const char* dataSourceName, const char* databaseUser, const char* databasePassword )
{
RETCODE rc = ::SQLConnect( connHandle,
(UCHAR*)dataSourceName, SQL_NTS,
(UCHAR*)databaseUser, SQL_NTS,
(UCHAR*)databasePassword, SQL_NTS );

if ( rc == SQL_SUCCESS || rc == SQL_SUCCESS_WITH_INFO )
{
connectedODBC = true;

if ( ::SQLAllocStmt( connHandle, &statementHandle ) == SQL_SUCCESS )
return true;
}

return false;
}

void CDemoODBC::DisconnectFromDatabase()
{
if ( statementHandle != SQL_NULL_HSTMT )
{
::SQLFreeStmt( statementHandle, SQL_DROP );
statementHandle = SQL_NULL_HSTMT;
}

if ( connectedODBC )
{
::SQLDisconnect( connHandle );
connectedODBC = false;
}
}

bool CDemoODBC::Save( const char* paino, const char* halkaisija )
{
SDWORD painoLen = SQL_NTS;
SDWORD halkaisijaLen = SQL_NTS;

if ( ::SQLPrepare( statementHandle,
(unsigned char*)"INSERT INTO Painojono "
"(Pvmklo, Paino, Halkaisija) "
"VALUES "
"(GetDate(), ?, ?)", SQL_NTS ) == SQL_SUCCESS )
{
if ( ::SQLBindParameter( statementHandle, 1, SQL_PARAM_INPUT, SQL_C_CHAR, SQL_FLOAT, 0, 0, (char*)paino, 0, &painoLen ) == SQL_SUCCESS )
{
if ( ::SQLBindParameter( statementHandle, 2, SQL_PARAM_INPUT, SQL_C_CHAR, SQL_FLOAT, 0, 0, (char*)halkaisija, 0, &halkaisijaLen ) == SQL_SUCCESS )
{
if ( ::SQLExecute( statementHandle ) == SQL_SUCCESS )
{
if ( ::SQLTransact( envHandle, SQL_NULL_HSTMT, SQL_COMMIT ) == SQL_SUCCESS )
return true;
}
}
}
}

return false;
}

 
0
 
LVL 1

Expert Comment

by:carldean
ID: 2599680
If you only ever intend to connect to an Access database (i.e. you don't have any plans to move the data to Oracle or something similar at a later date) then you should use the Microsoft DAO classes.

However, if you are not able to use MFC then you will have to go along the ODBC route and use the ODBC API as described in Wyn's reply.
0
 
LVL 5

Expert Comment

by:Wyn
ID: 2600339
yup,carldean is right .
I think you ask here than MFC area thus I suggest this.But I'd suggest you use MFC class for efficency if you can do that.
Regards
W.Yinan
0

Featured Post

Top 6 Sources for Identifying Threat Actor TTPs

Understanding your enemy is essential. These six sources will help you identify the most popular threat actor tactics, techniques, and procedures (TTPs).

Join & Write a Comment

Suggested Solutions

Errors will happen. It is a fact of life for the programmer. How and when errors are detected have a great impact on quality and cost of a product. It is better to detect errors at compile time, when possible and practical. Errors that make their wa…
Basic understanding on "OO- Object Orientation" is needed for designing a logical solution to solve a problem. Basic OOAD is a prerequisite for a coder to ensure that they follow the basic design of OO. This would help developers to understand the b…
The viewer will learn how to use the return statement in functions in C++. The video will also teach the user how to pass data to a function and have the function return data back for further processing.
The viewer will learn how to user default arguments when defining functions. This method of defining functions will be contrasted with the non-default-argument of defining functions.

759 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

21 Experts available now in Live!

Get 1:1 Help Now