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/*-------------------------------------------------------------------------
*
* pgcursordb.h
*
*
* DESCRIPTION
* Postgres Cursor Database Class:
* Query Postgres backend using a cursor
*
* NOTES
* Currently under construction.
*
* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
*
* $Id: pgcursordb.h,v 1.12 2002/07/02 16:32:19 momjian Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef PGCURSORDB_H
#define PGCURSORDB_H
#ifndef PGTRANSDB_H
#include "pgtransdb.h"
#endif
#ifdef HAVE_NAMESPACE_STD
#define PGSTD std::
#else
#define PGSTD
#endif
// ****************************************************************
//
// PgCursor - a class for querying databases using a cursor
//
// ****************************************************************
// This is the database access class that declares a cursor and
// manipulates data through it. The interface will introduce some
// ease of use through the methods that will allow cursor specific
// operations, like fetch, forward, etc.
class DLLIMPORT PgCursor : public PgTransaction
{
public:
PgCursor(const char* conninfo, const char* cursor); // use reasonable & environment defaults
// connect to the database with given environment and database name
// PgCursor(const PgConnection&, const char* cursor);
~PgCursor(); // close connection and clean up
// Commands associated with cursor interface
int Declare(PGSTD string query, bool binary = false); // Declare a cursor with given name
int Fetch(const char* dir = "FORWARD"); // Fetch ALL tuples in given direction
int Fetch(unsigned num, const char* dir = "FORWARD"); // Fetch specified amount of tuples
int Close(); // Close the cursor
// Accessors to the cursor name
const char* Cursor() const
{
return pgCursor.c_str();
}
// TODO: Setter has same name as getter--ouch!
// OBSOLESCENT
void Cursor(PGSTD string cursor)
{
pgCursor = cursor;
}
protected:
int Fetch(PGSTD string num, PGSTD string dir);
protected:
PGSTD string pgCursor;
protected:
PgCursor() : PgTransaction()
{} // Do not connect
private:
// We don't support copying of PgCursor objects,
// so make copy constructor and assignment op private.
PgCursor(const PgCursor&);
PgCursor& operator= (const PgCursor&);
}
; // End PgCursor Class Declaration
#undef PGSTD
#endif // PGCURSORDB_H
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