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