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