mirror of
https://github.com/FirebirdSQL/firebird.git
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144 lines
3.3 KiB
C++
144 lines
3.3 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 John Bellardo
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* for the Firebird Open Source RDBMS project.
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*
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* Copyright (c) 2000 John Bellardo <bellardo@users.sourceforge.net>
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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 "../jrd/evl_proto.h"
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#include "../jrd/mov_proto.h"
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#include "RecordSource.h"
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using namespace Firebird;
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using namespace Jrd;
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// -------------------------------
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// Data access: skip N rows filter
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// -------------------------------
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SkipRowsStream::SkipRowsStream(CompilerScratch* csb, RecordSource* next, ValueExprNode* value)
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: m_next(next), m_value(value)
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{
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fb_assert(m_next && m_value);
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m_impure = CMP_impure(csb, sizeof(Impure));
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}
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void SkipRowsStream::open(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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impure->irsb_flags = irsb_open;
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const dsc* desc = EVL_expr(tdbb, request, m_value);
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const SINT64 value = (desc && !(request->req_flags & req_null)) ? MOV_get_int64(desc, 0) : 0;
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if (value < 0)
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{
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status_exception::raise(Arg::Gds(isc_bad_skip_param));
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}
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impure->irsb_count = value + 1;
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m_next->open(tdbb);
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}
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void SkipRowsStream::close(thread_db* tdbb) const
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{
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jrd_req* const request = tdbb->getRequest();
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invalidateRecords(request);
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Impure* const impure = request->getImpure<Impure>(m_impure);
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if (impure->irsb_flags & irsb_open)
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{
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impure->irsb_flags &= ~irsb_open;
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m_next->close(tdbb);
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}
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}
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bool SkipRowsStream::getRecord(thread_db* tdbb) const
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{
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if (--tdbb->tdbb_quantum < 0)
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JRD_reschedule(tdbb, 0, true);
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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_flags & irsb_open))
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return false;
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while (impure->irsb_count > 1)
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{
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impure->irsb_count--;
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if (!m_next->getRecord(tdbb))
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return false;
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}
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impure->irsb_count--;
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return m_next->getRecord(tdbb);
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}
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bool SkipRowsStream::refetchRecord(thread_db* tdbb) const
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{
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return m_next->refetchRecord(tdbb);
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}
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bool SkipRowsStream::lockRecord(thread_db* tdbb) const
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{
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return m_next->lockRecord(tdbb);
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}
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void SkipRowsStream::print(thread_db* tdbb, string& plan, bool detailed, unsigned level) const
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{
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if (detailed)
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plan += printIndent(++level) + "Skip N Records";
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m_next->print(tdbb, plan, detailed, level);
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}
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void SkipRowsStream::markRecursive()
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{
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m_next->markRecursive();
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}
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void SkipRowsStream::findUsedStreams(StreamList& streams, bool expandAll) const
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{
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m_next->findUsedStreams(streams, expandAll);
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}
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void SkipRowsStream::invalidateRecords(jrd_req* request) const
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{
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m_next->invalidateRecords(request);
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}
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void SkipRowsStream::nullRecords(thread_db* tdbb) const
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{
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m_next->nullRecords(tdbb);
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}
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