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/*-------------------------------------------------------------------------
*
* pgconnection.h
*
*
* DESCRIPTION
* Postgres Connection Class:
* Manage Postgres backend connection
*
* NOTES
* Currently under construction.
*
* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: pgconnection.h,v 1.19 2002/07/02 16:32:19 momjian Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef PGCONNECTION_H
#define PGCONNECTION_H
extern "C"
{
#include "pg_config.h"
}
/* We assume that the C++ compiler will have these keywords, even though
* pg_config.h may have #define'd them to empty because the C compiler doesn't.
*/
#undef const
#undef inline
#undef signed
#undef volatile
#ifdef HAVE_CXX_STRING_HEADER
#include <string>
#endif
extern "C"
{
#include "libpq-fe.h"
}
#ifdef HAVE_NAMESPACE_STD
#define PGSTD std::
#else
#define PGSTD
#endif
// ****************************************************************
//
// PgConnection - a connection made to a postgres backend
//
// ****************************************************************
// This class contains all the information about the connection
// to the backend process. All the database classes should be
// derived from this class to obtain the connection interface.
class DLLIMPORT PgConnection
{
protected:
PGconn* pgConn; // Connection Structure
PGresult* pgResult; // Current Query Result
bool pgCloseConnection; // true if connection should be closed by destructor
public:
explicit PgConnection(const char* conninfo); // use reasonable & environment defaults
virtual ~PgConnection(); // close connection and clean up
// Connection status and error messages
ConnStatusType Status() const;
bool ConnectionBad() const;
const char* ErrorMessage() const;
// returns the database name of the connection
const char* DBName() const;
// Query Execution interface
ExecStatusType Exec(const char* query); // send a query to the backend
int ExecCommandOk(const char* query); // send a command and check if it's OK
int ExecTuplesOk(const char* query); // send a command and check if tuples are returned
PGnotify* Notifies();
// set the notice processor
PQnoticeProcessor SetNoticeProcessor(PQnoticeProcessor proc, void *arg);
protected:
ConnStatusType Connect(const char* conninfo);
void CloseConnection();
static PGSTD string IntToString(int);
// Default constructor is only available to subclasses
PgConnection();
private:
// We don't support copying of PgConnection objects,
// so make copy constructor and assignment op private.
PgConnection(const PgConnection&);
PgConnection& operator= (const PgConnection&);
};
#undef PGSTD
#endif // PGCONNECTION_H
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