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#ifndef ITEM_VERS_INCLUDED
#define ITEM_VERS_INCLUDED
/* Copyright (c) 2017, MariaDB Corporation.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA */
/* System Versioning items */
#include "vtq.h"
#ifdef USE_PRAGMA_INTERFACE
#pragma interface /* gcc class implementation */
#endif
template <class Item_func_X>
class VTQ_common : public Item_func_X
{
protected:
handlerton *hton;
void init_hton();
public:
VTQ_common(THD *thd, Item* a) :
Item_func_X(thd, a),
hton(NULL) {}
VTQ_common(THD *thd, Item* a, Item* b) :
Item_func_X(thd, a, b),
hton(NULL) {}
VTQ_common(THD *thd, Item* a, handlerton* _hton) :
Item_func_X(thd, a),
hton(_hton) {}
};
class Item_func_vtq_ts :
public VTQ_common<Item_datetimefunc>
{
vtq_field_t vtq_field;
public:
Item_func_vtq_ts(THD *thd, Item* a, vtq_field_t _vtq_field, handlerton *hton);
Item_func_vtq_ts(THD *thd, Item* a, vtq_field_t _vtq_field);
const char *func_name() const
{
if (vtq_field == VTQ_BEGIN_TS)
{
return "vtq_begin_ts";
}
return "vtq_commit_ts";
}
bool get_date(MYSQL_TIME *res, ulonglong fuzzy_date);
Item *get_copy(THD *thd, MEM_ROOT *mem_root)
{ return get_item_copy<Item_func_vtq_ts>(thd, mem_root, this); }
};
class Item_func_vtq_id :
public VTQ_common<Item_int_func>
{
vtq_field_t vtq_field;
vtq_record_t cached_result;
bool backwards;
longlong get_by_trx_id(ulonglong trx_id);
longlong get_by_commit_ts(MYSQL_TIME &commit_ts, bool backwards);
public:
Item_func_vtq_id(THD *thd, Item* a, vtq_field_t _vtq_field, bool _backwards= false);
Item_func_vtq_id(THD *thd, Item* a, Item* b, vtq_field_t _vtq_field);
vtq_record_t *vtq_cached_result() { return &cached_result; }
const char *func_name() const
{
switch (vtq_field)
{
case VTQ_TRX_ID:
return "vtq_trx_id";
case VTQ_COMMIT_ID:
return "vtq_commit_id";
case VTQ_ISO_LEVEL:
return "vtq_iso_level";
default:
DBUG_ASSERT(0);
}
return NULL;
}
void fix_length_and_dec()
{
Item_int_func::fix_length_and_dec();
max_length= 20;
}
longlong val_int();
Item *get_copy(THD *thd, MEM_ROOT *mem_root)
{ return get_item_copy<Item_func_vtq_id>(thd, mem_root, this); }
};
class Item_func_vtq_trx_sees :
public VTQ_common<Item_bool_func>
{
protected:
bool accept_eq;
public:
Item_func_vtq_trx_sees(THD *thd, Item* a, Item* b);
const char *func_name() const
{
return "vtq_trx_sees";
}
longlong val_int();
Item *get_copy(THD *thd, MEM_ROOT *mem_root)
{ return get_item_copy<Item_func_vtq_trx_sees>(thd, mem_root, this); }
};
class Item_func_vtq_trx_sees_eq :
public Item_func_vtq_trx_sees
{
public:
Item_func_vtq_trx_sees_eq(THD *thd, Item* a, Item* b) :
Item_func_vtq_trx_sees(thd, a, b)
{
accept_eq= true;
}
const char *func_name() const
{
return "vtq_trx_sees_eq";
}
};
#endif /* ITEM_VERS_INCLUDED */
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