mirror of
https://github.com/FirebirdSQL/firebird.git
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130 lines
3.3 KiB
C++
130 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 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/rse.h"
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#include "../jrd/cmp_proto.h"
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#include "../jrd/met_proto.h"
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#include "../jrd/vio_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: virtual table scan
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// -------------------------------
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VirtualTableScan::VirtualTableScan(CompilerScratch* csb, const string& alias,
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StreamType stream, jrd_rel* relation)
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: RecordStream(csb, stream), m_relation(relation), m_alias(csb->csb_pool, alias)
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{
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m_impure = CMP_impure(csb, sizeof(Impure));
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}
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void VirtualTableScan::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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record_param* const rpb = &request->req_rpb[m_stream];
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rpb->getWindow(tdbb).win_flags = 0;
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VIO_record(tdbb, rpb, getFormat(tdbb, m_relation), request->req_pool);
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rpb->rpb_number.setValue(BOF_NUMBER);
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}
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void VirtualTableScan::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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impure->irsb_flags &= ~irsb_open;
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}
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bool VirtualTableScan::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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record_param* const rpb = &request->req_rpb[m_stream];
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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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rpb->rpb_number.setValid(false);
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return false;
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}
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rpb->rpb_number.increment();
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if (retrieveRecord(tdbb, m_relation, rpb->rpb_number.getValue(), rpb->rpb_record))
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{
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rpb->rpb_number.setValid(true);
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return true;
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}
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rpb->rpb_number.setValid(false);
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return false;
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}
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bool VirtualTableScan::refetchRecord(thread_db* /*tdbb*/) const
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{
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return true;
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}
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bool VirtualTableScan::lockRecord(thread_db* /*tdbb*/) const
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{
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status_exception::raise(Arg::Gds(isc_record_lock_not_supp));
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return false; // compiler silencer
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}
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void VirtualTableScan::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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{
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plan += printIndent(++level) + "Table " +
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printName(tdbb, m_relation->rel_name.c_str(), m_alias) + " Full Scan";
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}
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else
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{
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if (!level)
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plan += "(";
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plan += printName(tdbb, m_alias, false) + " NATURAL";
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if (!level)
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plan += ")";
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}
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}
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