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96 lines
2.3 KiB
C++
96 lines
2.3 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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#ifndef JRD_CURSOR_H
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#define JRD_CURSOR_H
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#include "../common/classes/array.h"
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namespace Jrd
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{
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class thread_db;
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class CompilerScratch;
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class RecordSource;
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// Cursor class (wrapper around the whole access tree)
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class Cursor
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{
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enum State { BOS, POSITIONED, EOS };
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struct Impure
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{
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bool irsb_active;
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State irsb_state;
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FB_UINT64 irsb_position;
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RecordBuffer* irsb_buffer;
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};
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public:
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Cursor(CompilerScratch* csb, const RecordSource* rsb, const VarInvariantArray* invariants,
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bool scrollable);
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void open(thread_db* tdbb) const;
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void close(thread_db* tdbb) const;
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bool fetchNext(thread_db* tdbb) const;
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bool fetchPrior(thread_db* tdbb) const;
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bool fetchFirst(thread_db* tdbb) const;
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bool fetchLast(thread_db* tdbb) const;
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bool fetchAbsolute(thread_db* tdbb, SINT64 offset) const;
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bool fetchRelative(thread_db* tdbb, SINT64 offset) const;
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void checkState(jrd_req* request) const;
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const RecordSource* getAccessPath() const
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{
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return m_top;
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}
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private:
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bool validate(thread_db* tdbb) const
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{
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const jrd_req* const request = tdbb->getRequest();
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if (request->req_flags & req_abort)
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return false;
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if (!request->req_transaction)
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return false;
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return true;
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}
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public:
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Firebird::MetaName name; // optional name for explicit PSQL cursors
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private:
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ULONG m_impure;
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const RecordSource* const m_top;
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const VarInvariantArray* const m_invariants;
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const bool m_scrollable;
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};
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} // namespace
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#endif // JRD_CURSOR_H
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