How to create database connectivity through C++ - c++

Question

In C++, how can I establish an SQL connection to store data in an SQL database?

Answer 1

You should have a look at C preprocessors that exists traditionaly with databases (ecpg for postgres, Pro*C for oracle ... which lets you embed straight SQL directly in your source files) or an orginal system for mysql. ECPG will do with C++, that is/was not the case for some other preprocessors ...

Answer 2

IF you are targetting Windows, then you might want to use ODBC.

Answer 3

you could try wxSqlite with SQLite as Database. This offers you an open source connection header / c++ file to get started.
In general - you should get some kind of library that offers you the required functionality. All major DB vendors should offer at least a C library. Most of the time you get a C++ library or wrapper for the C one.

Answer 4

Use SQLAPI++ - it's cross platform and supports MS SQL Server, Oracle, Postgres and others. Very easy to use.
http://www.sqlapi.com/

Answer 5

If you targeting windows you can always use the import ability.
#import "c:\Program Files\Common Files\System\ADO\msado15.dll" no_namespace rename( "EOF", "EndOfFile" )
Then you could make a wrapper to deal with the SQL.
Little example, just to open close a connection
// H
class CExtAdoDatabase
{
public:
CExtAdoDatabase( const char* p_cConnectString="", const char* p_cUsername="", const char* p_cPwd="" );
virtual ~CExtAdoDatabase();
bool Open( const char* p_cConnectString="", const char* p_cUsername="", const char* p_cPwd="" );
bool Close();
private:
HRESULT _hInitRes;
bool _bIsValid;
_ConnectionPtr *_p_pConnection;
};
// CPP
CExtAdoDatabase::CExtAdoDatabase( const char* p_cConnectString, const char* p_cUsername, const char* p_cPwd ) : _hInitRes( CoInitialize( NULL ))
{
_p_pConnection = new _ConnectionPtr( "ADODB.Connection" );
if( FAILED( _hInitRes ))
_bIsValid = false;
else
{
_bIsValid = true;
(*_p_pConnection)->ConnectionTimeout=0;
(*_p_pConnection)->CommandTimeout=0;
if( p_cConnectString != NULL && strlen(p_cConnectString) )
{
_bstr_t scs( p_cConnectString );
_bstr_t susr( p_cUsername );
_bstr_t spwd( p_cPwd );
(*_p_pConnection)->Open( scs, susr, spwd, NULL );
}
}
}
CExtAdoDatabase::~CExtAdoDatabase()
{
Close();
delete _p_pConnection;
CoUninitialize();
}
bool CExtAdoDatabase::Open( const char* p_cConnectString, const char* p_cUsername, const char* p_cPwd )
{
if(_bIsValid)
{
_bstr_t scs( p_cConnectString );
_bstr_t susr( p_cUsername );
_bstr_t spwd( p_cPwd );
return ((*_p_pConnection)->Open( scs, susr, spwd, NULL ) == S_OK);
}
else
return false;
}
bool CExtAdoDatabase::Close()
{
if( _bIsValid )
{
if( (*_p_pConnection)->GetState() == adStateOpen )
return !!(*_p_pConnection)->Close();
else
return true;
}
else
return false;
}