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/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
*
* Copyright (C) 2008 Sun Microsystems
*
* 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 St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <drizzled/server_includes.h>
#include CSTDINT_H
#include <drizzled/function/time/add_time.h>
#include <drizzled/function/time/make_datetime.h>
#include <drizzled/function/time/make_datetime_with_warn.h>
void Item_func_add_time::fix_length_and_dec()
{
enum_field_types arg0_field_type;
decimals=0;
max_length=MAX_DATETIME_FULL_WIDTH*MY_CHARSET_BIN_MB_MAXLEN;
maybe_null= 1;
/*
The field type for the result of an Item_func_add_time function is defined
as follows:
- If first arg is a DRIZZLE_TYPE_DATETIME or DRIZZLE_TYPE_TIMESTAMP
result is DRIZZLE_TYPE_DATETIME
- If first arg is a DRIZZLE_TYPE_TIME result is DRIZZLE_TYPE_TIME
- Otherwise the result is DRIZZLE_TYPE_VARCHAR
*/
cached_field_type= DRIZZLE_TYPE_VARCHAR;
arg0_field_type= args[0]->field_type();
if (arg0_field_type == DRIZZLE_TYPE_DATE ||
arg0_field_type == DRIZZLE_TYPE_DATETIME ||
arg0_field_type == DRIZZLE_TYPE_TIMESTAMP)
cached_field_type= DRIZZLE_TYPE_DATETIME;
else if (arg0_field_type == DRIZZLE_TYPE_TIME)
cached_field_type= DRIZZLE_TYPE_TIME;
}
/**
ADDTIME(t,a) and SUBTIME(t,a) are time functions that calculate a
time/datetime value
t: time_or_datetime_expression
a: time_expression
Result: Time value or datetime value
*/
String *Item_func_add_time::val_str(String *str)
{
assert(fixed == 1);
DRIZZLE_TIME l_time1, l_time2, l_time3;
bool is_time= 0;
long days, microseconds;
int64_t seconds;
int l_sign= sign;
null_value=0;
if (is_date) // TIMESTAMP function
{
if (get_arg0_date(&l_time1, TIME_FUZZY_DATE) ||
args[1]->get_time(&l_time2) ||
l_time1.time_type == DRIZZLE_TIMESTAMP_TIME ||
l_time2.time_type != DRIZZLE_TIMESTAMP_TIME)
goto null_date;
}
else // ADDTIME function
{
if (args[0]->get_time(&l_time1) ||
args[1]->get_time(&l_time2) ||
l_time2.time_type == DRIZZLE_TIMESTAMP_DATETIME)
goto null_date;
is_time= (l_time1.time_type == DRIZZLE_TIMESTAMP_TIME);
}
if (l_time1.neg != l_time2.neg)
l_sign= -l_sign;
memset(&l_time3, 0, sizeof(l_time3));
l_time3.neg= calc_time_diff(&l_time1, &l_time2, -l_sign,
&seconds, µseconds);
/*
If first argument was negative and diff between arguments
is non-zero we need to swap sign to get proper result.
*/
if (l_time1.neg && (seconds || microseconds))
l_time3.neg= 1-l_time3.neg; // Swap sign of result
if (!is_time && l_time3.neg)
goto null_date;
days= (long)(seconds/86400L);
calc_time_from_sec(&l_time3, (long)(seconds%86400L), microseconds);
if (!is_time)
{
get_date_from_daynr(days,&l_time3.year,&l_time3.month,&l_time3.day);
if (l_time3.day &&
!make_datetime(l_time1.second_part || l_time2.second_part ?
DATE_TIME_MICROSECOND : DATE_TIME,
&l_time3, str))
return str;
goto null_date;
}
l_time3.hour+= days*24;
if (!make_datetime_with_warn(l_time1.second_part || l_time2.second_part ?
TIME_MICROSECOND : TIME_ONLY,
&l_time3, str))
return str;
null_date:
null_value=1;
return 0;
}
void Item_func_add_time::print(String *str, enum_query_type query_type)
{
if (is_date)
{
assert(sign > 0);
str->append(STRING_WITH_LEN("timestamp("));
}
else
{
if (sign > 0)
str->append(STRING_WITH_LEN("addtime("));
else
str->append(STRING_WITH_LEN("subtime("));
}
args[0]->print(str, query_type);
str->append(',');
args[1]->print(str, query_type);
str->append(')');
}
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