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/*-------------------------------------------------------------------------
*
* pgconnection.h
*
*
* DESCRIPTION
* Postgres Connection Class:
* Manage Postgres backend connection
*
* NOTES
* Currently under construction.
*
* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: pgconnection.h,v 1.10 2001/02/10 02:31:30 tgl Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef PGCONNECTION_H
#define PGCONNECTION_H
extern "C" {
#include "config.h"
}
/* We assume that the C++ compiler will have these keywords, even though
* config.h may have #define'd them to empty because C compiler doesn't.
*/
#undef const
#undef inline
#undef signed
#undef volatile
#ifdef HAVE_CXX_STRING_HEADER
#include <string>
#endif
extern "C" {
#include "postgres_fe.h"
#include "libpq-fe.h"
}
#ifdef HAVE_NAMESPACE_STD
using namespace std;
#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 PgConnection {
protected:
PGconn* pgConn; // Connection Structure
PGresult* pgResult; // Current Query Result
int pgCloseConnection; // TRUE if connection should be closed by destructor
public:
PgConnection(const char* conninfo); // use reasonable & environment defaults
virtual ~PgConnection(); // close connection and clean up
// Connection status and error messages
ConnStatusType Status();
int ConnectionBad();
const char* ErrorMessage();
// returns the database name of the connection
const char* DBName();
// 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();
protected:
ConnStatusType Connect(const char* conninfo);
void CloseConnection();
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&);
};
#endif // PGCONNECTION_H
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