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/*-------------------------------------------------------------------------
*
* pgcursordb.h
*
*
* DESCRIPTION
* Postgres Cursor Database Class:
* Query Postgres backend using a cursor
*
* NOTES
* Currently under construction.
*
* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
*
* $Id: pgcursordb.h,v 1.6 2001/01/24 19:43:32 momjian Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef PGCURSORDB_H
#define PGCURSORDB_H
#ifndef PGTRANSDB_H
#include "pgtransdb.h"
#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 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(const string& query, int binary = 0); // 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(); }
void Cursor(const string& cursor) { pgCursor = cursor; }
protected:
int Fetch(const string& num, const string& dir);
protected:
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
#endif // PGCURSORDB_H
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