Current File : //usr/include/mysql/server/private/item_vers.h
#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 */
#ifdef USE_PRAGMA_INTERFACE
#pragma interface /* gcc class implementation */
#endif
class Item_func_history: public Item_bool_func
{
public:
/*
@param a Item_field for row_end system field
*/
Item_func_history(THD *thd, Item *a): Item_bool_func(thd, a)
{
DBUG_ASSERT(a->type() == Item::FIELD_ITEM);
}
bool val_bool() override;
longlong val_int() override { return val_bool(); }
bool fix_length_and_dec() override
{
set_maybe_null();
null_value= 0;
decimals= 0;
max_length= 1;
return FALSE;
}
LEX_CSTRING func_name_cstring() const override
{
static LEX_CSTRING name= {STRING_WITH_LEN("is_history") };
return name;
}
void print(String *str, enum_query_type query_type) override;
Item *do_get_copy(THD *thd) const override
{ return get_item_copy<Item_func_history>(thd, this); }
};
class Item_func_trt_ts: public Item_datetimefunc
{
TR_table::field_id_t trt_field;
public:
Item_func_trt_ts(THD *thd, Item* a, TR_table::field_id_t _trt_field);
LEX_CSTRING func_name_cstring() const override
{
static LEX_CSTRING begin_name= {STRING_WITH_LEN("trt_begin_ts") };
static LEX_CSTRING commit_name= {STRING_WITH_LEN("trt_commit_ts") };
return (trt_field == TR_table::FLD_BEGIN_TS) ? begin_name : commit_name;
}
bool get_date(THD *thd, MYSQL_TIME *res, date_mode_t fuzzydate) override;
Item *do_get_copy(THD *thd) const override
{ return get_item_copy<Item_func_trt_ts>(thd, this); }
bool fix_length_and_dec() override
{ fix_attributes_datetime(decimals); return FALSE; }
};
class Item_func_trt_id : public Item_longlong_func
{
TR_table::field_id_t trt_field;
bool backwards;
longlong get_by_trx_id(ulonglong trx_id);
longlong get_by_commit_ts(MYSQL_TIME &commit_ts, bool backwards);
public:
Item_func_trt_id(THD *thd, Item* a, TR_table::field_id_t _trt_field, bool _backwards= false);
Item_func_trt_id(THD *thd, Item* a, Item* b, TR_table::field_id_t _trt_field);
LEX_CSTRING func_name_cstring() const override
{
static LEX_CSTRING trx_name= {STRING_WITH_LEN("trt_trx_id") };
static LEX_CSTRING commit_name= {STRING_WITH_LEN("trt_commit_id") };
static LEX_CSTRING iso_name= {STRING_WITH_LEN("trt_iso_level") };
switch (trt_field) {
case TR_table::FLD_TRX_ID:
return trx_name;
case TR_table::FLD_COMMIT_ID:
return commit_name;
case TR_table::FLD_ISO_LEVEL:
return iso_name;
default:
DBUG_ASSERT(0);
}
return NULL_clex_str;
}
bool fix_length_and_dec() override
{
bool res= Item_int_func::fix_length_and_dec();
max_length= 20;
return res;
}
longlong val_int() override;
Item *do_get_copy(THD *thd) const override
{ return get_item_copy<Item_func_trt_id>(thd, this); }
};
class Item_func_trt_trx_sees : public Item_bool_func
{
protected:
bool accept_eq;
public:
Item_func_trt_trx_sees(THD *thd, Item* a, Item* b);
LEX_CSTRING func_name_cstring() const override
{
static LEX_CSTRING name= {STRING_WITH_LEN("trt_trx_sees") };
return name;
}
longlong val_int() override;
Item *do_get_copy(THD *thd) const override
{ return get_item_copy<Item_func_trt_trx_sees>(thd, this); }
};
class Item_func_trt_trx_sees_eq :
public Item_func_trt_trx_sees
{
public:
Item_func_trt_trx_sees_eq(THD *thd, Item* a, Item* b) :
Item_func_trt_trx_sees(thd, a, b)
{
accept_eq= true;
}
LEX_CSTRING func_name_cstring() const override
{
static LEX_CSTRING name= {STRING_WITH_LEN("trt_trx_sees_eq") };
return name;
}
};
#endif /* ITEM_VERS_INCLUDED */
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