mirror of
https://github.com/FirebirdSQL/firebird.git
synced 2025-01-31 01:23:02 +01:00
321 lines
7.0 KiB
C++
321 lines
7.0 KiB
C++
/*
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* The contents of this file are subject to the Initial
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* Developer's Public License Version 1.0 (the "License");
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* you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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* http://www.ibphoenix.com/main.nfs?a=ibphoenix&page=ibp_idpl.
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*
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* Software distributed under the License is distributed AS IS,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied.
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* See the License for the specific language governing rights
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* and limitations under the License.
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*
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* The Original Code was created by Dmitry Yemanov
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* for the Firebird Open Source RDBMS project.
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*
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* Copyright (c) 2009 Dmitry Yemanov <dimitr@firebirdsql.org>
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* and all contributors signed below.
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*
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* All Rights Reserved.
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* Contributor(s): ______________________________________.
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*/
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#include "firebird.h"
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#include "../jrd/jrd.h"
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#include "../jrd/req.h"
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#include "../jrd/cmp_proto.h"
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#include "RecordSource.h"
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#include "Cursor.h"
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using namespace Firebird;
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using namespace Jrd;
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// ---------------------
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// Cursor implementation
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// ---------------------
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Cursor::Cursor(CompilerScratch* csb, const RecordSource* rsb,
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const VarInvariantArray* invariants, bool scrollable)
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: m_top(rsb), m_invariants(invariants), m_scrollable(scrollable)
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{
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fb_assert(m_top);
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m_impure = CMP_impure(csb, sizeof(Impure));
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}
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void Cursor::open(thread_db* tdbb) const
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{
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jrd_req* const request = tdbb->getRequest();
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Impure* impure = request->getImpure<Impure>(m_impure);
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impure->irsb_active = true;
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impure->irsb_state = BOS;
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// Initialize dependent invariants
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if (m_invariants)
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{
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for (const ULONG* iter = m_invariants->begin(); iter < m_invariants->end(); iter++)
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{
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impure_value* const invariantImpure = request->getImpure<impure_value>(*iter);
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invariantImpure->vlu_flags = 0;
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}
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}
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m_top->open(tdbb);
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}
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void Cursor::close(thread_db* tdbb) const
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{
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jrd_req* const request = tdbb->getRequest();
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Impure* const impure = request->getImpure<Impure>(m_impure);
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if (impure->irsb_active)
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{
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impure->irsb_active = false;
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m_top->close(tdbb);
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}
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}
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bool Cursor::fetchNext(thread_db* tdbb) const
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{
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if (!validate(tdbb))
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return false;
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jrd_req* const request = tdbb->getRequest();
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Impure* const impure = request->getImpure<Impure>(m_impure);
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if (!impure->irsb_active)
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{
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// error: invalid cursor state
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status_exception::raise(Arg::Gds(isc_cursor_not_open));
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}
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if (impure->irsb_state == EOS)
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{
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// error: cursor is past EOF
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status_exception::raise(Arg::Gds(isc_stream_eof));
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}
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else if (impure->irsb_state == BOS)
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{
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impure->irsb_position = 0;
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}
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else
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{
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impure->irsb_position++;
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}
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if (!m_scrollable)
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{
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if (!m_top->getRecord(tdbb))
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{
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impure->irsb_state = EOS;
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return false;
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}
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}
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else
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{
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const BufferedStream* const buffer = static_cast<const BufferedStream*>(m_top);
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buffer->locate(tdbb, impure->irsb_position);
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if (!buffer->getRecord(tdbb))
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{
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impure->irsb_state = EOS;
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return false;
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}
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}
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request->req_records_selected++;
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request->req_records_affected.bumpFetched();
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impure->irsb_state = POSITIONED;
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return true;
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}
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bool Cursor::fetchPrior(thread_db* tdbb) const
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{
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if (!m_scrollable)
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{
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// error: invalid fetch direction
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status_exception::raise(Arg::Gds(isc_invalid_fetch_option) << Arg::Str("PRIOR"));
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}
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if (!validate(tdbb))
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return false;
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jrd_req* const request = tdbb->getRequest();
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Impure* const impure = request->getImpure<Impure>(m_impure);
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if (!impure->irsb_active)
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{
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// error: invalid cursor state
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status_exception::raise(Arg::Gds(isc_cursor_not_open));
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}
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const BufferedStream* const buffer = static_cast<const BufferedStream*>(m_top);
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if (impure->irsb_state == BOS)
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{
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// error: cursor is prior BOF
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status_exception::raise(Arg::Gds(isc_stream_bof));
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}
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else if (impure->irsb_state == EOS)
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{
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impure->irsb_position = buffer->getCount(tdbb) - 1;
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}
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else
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{
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impure->irsb_position--;
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}
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buffer->locate(tdbb, impure->irsb_position);
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if (!buffer->getRecord(tdbb))
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{
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impure->irsb_state = BOS;
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return false;
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}
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request->req_records_selected++;
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request->req_records_affected.bumpFetched();
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impure->irsb_state = POSITIONED;
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return true;
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}
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bool Cursor::fetchFirst(thread_db* tdbb) const
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{
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if (!m_scrollable)
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{
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// error: invalid fetch direction
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status_exception::raise(Arg::Gds(isc_invalid_fetch_option) << Arg::Str("FIRST"));
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}
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return fetchAbsolute(tdbb, 1);
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}
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bool Cursor::fetchLast(thread_db* tdbb) const
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{
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if (!m_scrollable)
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{
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// error: invalid fetch direction
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status_exception::raise(Arg::Gds(isc_invalid_fetch_option) << Arg::Str("LAST"));
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}
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return fetchAbsolute(tdbb, -1);
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}
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bool Cursor::fetchAbsolute(thread_db* tdbb, SINT64 offset) const
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{
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if (!m_scrollable)
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{
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// error: invalid fetch direction
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status_exception::raise(Arg::Gds(isc_invalid_fetch_option) << Arg::Str("ABSOLUTE"));
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}
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if (!validate(tdbb))
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return false;
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jrd_req* const request = tdbb->getRequest();
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Impure* const impure = request->getImpure<Impure>(m_impure);
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if (!impure->irsb_active)
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{
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// error: invalid cursor state
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status_exception::raise(Arg::Gds(isc_cursor_not_open));
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}
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if (!offset)
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{
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impure->irsb_state = BOS;
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return false;
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}
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const BufferedStream* const buffer = static_cast<const BufferedStream*>(m_top);
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impure->irsb_position = (offset > 0) ? offset - 1 : buffer->getCount(tdbb) + offset;
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buffer->locate(tdbb, impure->irsb_position);
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if (!buffer->getRecord(tdbb))
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{
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impure->irsb_state = (offset > 0) ? EOS : BOS;
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return false;
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}
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request->req_records_selected++;
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request->req_records_affected.bumpFetched();
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impure->irsb_state = POSITIONED;
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return true;
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}
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bool Cursor::fetchRelative(thread_db* tdbb, SINT64 offset) const
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{
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if (!m_scrollable)
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{
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// error: invalid fetch direction
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status_exception::raise(Arg::Gds(isc_invalid_fetch_option) << Arg::Str("RELATIVE"));
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}
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if (!validate(tdbb))
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return false;
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jrd_req* const request = tdbb->getRequest();
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Impure* const impure = request->getImpure<Impure>(m_impure);
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if (!impure->irsb_active)
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{
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// error: invalid cursor state
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status_exception::raise(Arg::Gds(isc_cursor_not_open));
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}
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if (!offset)
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{
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return (impure->irsb_state == POSITIONED);
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}
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if (impure->irsb_state == BOS && offset < 0)
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{
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return false;
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}
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if (impure->irsb_state == EOS && offset > 0)
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{
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return false;
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}
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const BufferedStream* const buffer = static_cast<const BufferedStream*>(m_top);
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impure->irsb_position += offset;
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buffer->locate(tdbb, impure->irsb_position);
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if (!buffer->getRecord(tdbb))
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{
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impure->irsb_state = (offset > 0) ? EOS : BOS;
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return false;
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}
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request->req_records_selected++;
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request->req_records_affected.bumpFetched();
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impure->irsb_state = POSITIONED;
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return true;
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}
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// Check if the cursor is in a good state for access a field.
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void Cursor::checkState(jrd_req* request) const
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{
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const Impure* const impure = request->getImpure<Impure>(m_impure);
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if (!impure->irsb_active)
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{
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// error: invalid cursor state
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status_exception::raise(Arg::Gds(isc_cursor_not_open));
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}
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if (impure->irsb_state != Cursor::POSITIONED)
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{
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status_exception::raise(
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Arg::Gds(isc_cursor_not_positioned) <<
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Arg::Str(name));
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}
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}
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