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/*-------------------------------------------------------------------------
*
* FILE
* pgcursordb.cpp
*
* DESCRIPTION
* implementation of the PgCursor class.
* PgCursor encapsulates a cursor interface to the backend
*
* Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/interfaces/libpq++/Attic/pgcursordb.cc,v 1.4 1999/06/01 02:43:37 momjian Exp $
*
*-------------------------------------------------------------------------
*/
#include "pgcursordb.h"
// ****************************************************************
//
// PgCursor Implementation
//
// ****************************************************************
// Make a connection to the specified database with default environment
// See PQconnectdb() for conninfo usage
PgCursor::PgCursor(const char* conninfo, const char* cursor)
: PgTransaction(conninfo), pgCursor(cursor)
{}
// Do not make a connection to the backend -- just query
// Connection should not be closed after the object destructs since some
// other object is using the connection
//PgCursor::PgCursor(const PgConnection& conn, const char* cursor)
// : PgTransaction(conn), pgCursor(cursor)
//{}
// Destructor: End the transaction block
PgCursor::~PgCursor()
{
Close();
}
// ****************************************************************
//
// PgCursor: Cursor Interface Implementation
//
// ****************************************************************
// Declare a cursor: name has already been supplied in the constructor
int PgCursor::Declare(const string& query, int binary)
{
string cmd = "DECLARE " + pgCursor;
if ( binary )
cmd += " BINARY";
cmd += " CURSOR FOR " + query;
return ExecCommandOk( cmd.c_str() );
} // End Declare()
// Fetch ALL tuples in given direction
int PgCursor::Fetch(const char* dir)
{
return Fetch("ALL", dir);
} // End Fetch()
// Fetch specified amount of tuples in given direction
int PgCursor::Fetch(unsigned num, const char* dir)
{
return Fetch( IntToString(num), dir );
} // End Fetch()
// Create and execute the actual fetch command with the given arguments
int PgCursor::Fetch(const string& num, const string& dir)
{
string cmd = "FETCH " + dir + " " + num + " IN " + pgCursor;
return ExecTuplesOk( cmd.c_str() );
} // End Fetch()
// Close the cursor: no more queries using the cursor should be allowed
// Actually, the backend should take care of it.
int PgCursor::Close()
{
string cmd = "CLOSE " + pgCursor;
return ExecCommandOk( cmd.c_str() );
} // End CloseCursor()
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