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