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83 lines
2.6 KiB
83 lines
2.6 KiB
3 months ago
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#ifndef SRS_FETCHER_H_INCLUDED
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#define SRS_FETCHER_H_INCLUDED
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/*
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Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License, version 2.0,
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as published by the Free Software Foundation.
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This program is also distributed with certain software (including
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but not limited to OpenSSL) that is licensed under separate terms,
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as designated in a particular file or component or in included license
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documentation. The authors of MySQL hereby grant you an additional
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permission to link the program and your derivative works with the
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separately licensed software that they have included with MySQL.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License, version 2.0, for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "sql/gis/geometries.h"
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#include "sql/gis/srid.h"
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#include "sql/mdl.h"
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namespace dd {
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class Spatial_reference_system;
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}
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class Srs_fetcher {
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private:
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THD *m_thd;
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/**
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Take an MDL lock on an SRID.
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@param[in] srid Spatial reference system ID
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@param[in] lock_type Type of lock to take
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@retval false Success.
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@retval true Locking failed. An error has already been flagged.
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*/
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bool lock(gis::srid_t srid, enum_mdl_type lock_type);
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public:
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Srs_fetcher(THD *thd) : m_thd(thd) {}
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/**
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Acquire an SRS from the data dictionary. Take a shared read lock on the
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SRID.
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@param[in] srid Spatial reference system ID
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@param[out] srs The spatial reference system
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@retval false Success.
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@retval true Locking failed. An error has already been flagged.
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*/
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bool acquire(gis::srid_t srid, const dd::Spatial_reference_system **srs);
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/**
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Acquire an SRS from the data dictionary with the intent of modifying
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it. Take an exclusive lock on the SRID.
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@param[in] srid Spatial reference system ID
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@param[out] srs The spatial reference system
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@retval false Success.
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@retval true Locking failed. An error has already been flagged.
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*/
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bool acquire_for_modification(gis::srid_t srid,
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dd::Spatial_reference_system **srs);
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static bool srs_exists(THD *thd, gis::srid_t srid, bool *exists);
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};
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#endif // SRS_FETCHER_H_INCLUDED
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