MySQL  8.0.27
Source Code Documentation
srs_fetcher.h
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1 #ifndef SRS_FETCHER_H_INCLUDED
2 #define SRS_FETCHER_H_INCLUDED
3 
4 /*
5  Copyright (c) 2017, 2021, Oracle and/or its affiliates.
6 
7  This program is free software; you can redistribute it and/or modify
8  it under the terms of the GNU General Public License, version 2.0,
9  as published by the Free Software Foundation.
10 
11  This program is also distributed with certain software (including
12  but not limited to OpenSSL) that is licensed under separate terms,
13  as designated in a particular file or component or in included license
14  documentation. The authors of MySQL hereby grant you an additional
15  permission to link the program and your derivative works with the
16  separately licensed software that they have included with MySQL.
17 
18  This program is distributed in the hope that it will be useful,
19  but WITHOUT ANY WARRANTY; without even the implied warranty of
20  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21  GNU General Public License, version 2.0, for more details.
22 
23  You should have received a copy of the GNU General Public License
24  along with this program; if not, write to the Free Software
25  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
26 */
27 
28 #include "sql/gis/geometries.h"
29 #include "sql/gis/srid.h"
30 #include "sql/mdl.h"
31 
32 namespace dd {
33 class Spatial_reference_system;
34 }
35 
36 class Srs_fetcher {
37  private:
39 
40  /**
41  Take an MDL lock on an SRID.
42 
43  @param[in] srid Spatial reference system ID
44  @param[in] lock_type Type of lock to take
45 
46  @retval false Success.
47  @retval true Locking failed. An error has already been flagged.
48  */
49  bool lock(gis::srid_t srid, enum_mdl_type lock_type);
50 
51  public:
52  Srs_fetcher(THD *thd) : m_thd(thd) {}
53 
54  /**
55  Acquire an SRS from the data dictionary. Take a shared read lock on the
56  SRID.
57 
58  @param[in] srid Spatial reference system ID
59  @param[out] srs The spatial reference system
60 
61  @retval false Success.
62  @retval true Locking failed. An error has already been flagged.
63  */
64  bool acquire(gis::srid_t srid, const dd::Spatial_reference_system **srs);
65 
66  /**
67  Acquire an SRS from the data dictionary with the intent of modifying
68  it. Take an exclusive lock on the SRID.
69 
70  @param[in] srid Spatial reference system ID
71  @param[out] srs The spatial reference system
72 
73  @retval false Success.
74  @retval true Locking failed. An error has already been flagged.
75  */
78 
79  static bool srs_exists(THD *thd, gis::srid_t srid, bool *exists);
80 };
81 
82 #endif // SRS_FETCHER_H_INCLUDED
Definition: srs_fetcher.h:36
bool acquire_for_modification(gis::srid_t srid, dd::Spatial_reference_system **srs)
Acquire an SRS from the data dictionary with the intent of modifying it.
Definition: item_geofunc_internal.cc:90
THD * m_thd
Definition: srs_fetcher.h:38
Srs_fetcher(THD *thd)
Definition: srs_fetcher.h:52
bool acquire(gis::srid_t srid, const dd::Spatial_reference_system **srs)
Acquire an SRS from the data dictionary.
Definition: item_geofunc_internal.cc:81
bool lock(gis::srid_t srid, enum_mdl_type lock_type)
Take an MDL lock on an SRID.
Definition: item_geofunc_internal.cc:60
static bool srs_exists(THD *thd, gis::srid_t srid, bool *exists)
Definition: item_geofunc_internal.cc:99
For each client connection we create a separate thread with THD serving as a thread/connection descri...
Definition: sql_class.h:821
Definition: spatial_reference_system.h:52
This file declares the geometry class hierarchy used by the server as the internal representation of ...
enum_mdl_type
Type of metadata lock request.
Definition: mdl.h:195
The version of the current data dictionary table definitions.
Definition: dictionary_client.h:42
std::uint32_t srid_t
A spatial reference system ID (SRID).
Definition: srid.h:32
static int exists(node_address *name, node_list const *nodes, u_int with_uid)
Definition: node_list.cc:105