mirror of
https://github.com/MariaDB/server.git
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136 lines
3.4 KiB
C++
136 lines
3.4 KiB
C++
#ifndef ITEM_VERS_INCLUDED
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#define ITEM_VERS_INCLUDED
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/* Copyright (c) 2017, MariaDB Corporation.
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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 as published by
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the Free Software Foundation; version 2 of the License.
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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 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 Street, Fifth Floor, Boston, MA 02110-1301, USA */
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/* System Versioning items */
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#include "vtq.h"
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#ifdef USE_PRAGMA_INTERFACE
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#pragma interface /* gcc class implementation */
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#endif
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template <class Item_func_X>
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class VTQ_common : public Item_func_X
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{
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protected:
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handlerton *hton;
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void check_hton();
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public:
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VTQ_common(THD *thd, handlerton* _hton, Item* a, Item* b) :
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Item_func_X(thd, a, b),
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hton(_hton) {}
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VTQ_common(THD *thd, handlerton* _hton, Item* a) :
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Item_func_X(thd, a),
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hton(_hton) {}
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};
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class Item_func_vtq_ts :
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public VTQ_common<Item_datetimefunc>
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{
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vtq_field_t vtq_field;
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public:
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Item_func_vtq_ts(THD *thd, handlerton *hton, Item* a, vtq_field_t _vtq_field);
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const char *func_name() const
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{
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if (vtq_field == VTQ_BEGIN_TS)
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{
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return "vtq_begin_ts";
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}
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return "vtq_commit_ts";
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}
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bool get_date(MYSQL_TIME *res, ulonglong fuzzy_date);
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Item *get_copy(THD *thd, MEM_ROOT *mem_root)
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{ return get_item_copy<Item_func_vtq_ts>(thd, mem_root, this); }
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};
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class Item_func_vtq_id :
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public VTQ_common<Item_int_func>
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{
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vtq_field_t vtq_field;
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vtq_record_t cached_result;
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bool backwards;
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longlong get_by_trx_id(ulonglong trx_id);
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longlong get_by_commit_ts(MYSQL_TIME &commit_ts, bool backwards);
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public:
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Item_func_vtq_id(THD *thd, handlerton *hton, Item* a, vtq_field_t _vtq_field, bool _backwards= false);
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Item_func_vtq_id(THD *thd, handlerton *hton, Item* a, Item* b, vtq_field_t _vtq_field);
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vtq_record_t *vtq_cached_result() { return &cached_result; }
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const char *func_name() const
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{
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switch (vtq_field)
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{
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case VTQ_TRX_ID:
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return "vtq_trx_id";
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case VTQ_COMMIT_ID:
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return "vtq_commit_id";
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case VTQ_ISO_LEVEL:
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return "vtq_iso_level";
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default:
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DBUG_ASSERT(0);
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}
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return NULL;
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}
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void fix_length_and_dec()
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{
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Item_int_func::fix_length_and_dec();
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max_length= 20;
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}
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longlong val_int();
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Item *get_copy(THD *thd, MEM_ROOT *mem_root)
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{ return get_item_copy<Item_func_vtq_id>(thd, mem_root, this); }
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};
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class Item_func_vtq_trx_sees :
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public VTQ_common<Item_bool_func>
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{
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protected:
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bool accept_eq;
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public:
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Item_func_vtq_trx_sees(THD *thd, handlerton *hton, Item* a, Item* b);
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const char *func_name() const
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{
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return "vtq_trx_sees";
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}
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longlong val_int();
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Item *get_copy(THD *thd, MEM_ROOT *mem_root)
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{ return get_item_copy<Item_func_vtq_trx_sees>(thd, mem_root, this); }
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};
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class Item_func_vtq_trx_sees_eq :
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public Item_func_vtq_trx_sees
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{
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public:
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Item_func_vtq_trx_sees_eq(THD *thd, handlerton *hton, Item* a, Item* b) :
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Item_func_vtq_trx_sees(thd, hton, a, b)
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{
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accept_eq= true;
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}
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const char *func_name() const
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{
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return "vtq_trx_sees_eq";
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}
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};
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#endif /* ITEM_VERS_INCLUDED */
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