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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, Inc.
*
* 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 <config.h>
#include <drizzled/temporal.h>
#include <drizzled/error.h>
#include <drizzled/session.h>
#include <drizzled/calendar.h>
#include <drizzled/function/time/extract.h>
namespace drizzled
{
/*
'interval_names' reflects the order of the enumeration interval_type.
See item/time.h
*/
extern const char *interval_names[];
void Item_extract::print(String *str)
{
str->append(STRING_WITH_LEN("extract("));
str->append(interval_names[int_type]);
str->append(STRING_WITH_LEN(" from "));
args[0]->print(str);
str->append(')');
}
void Item_extract::fix_length_and_dec()
{
value.alloc(DRIZZLE_MAX_LENGTH_DATETIME_AS_STRING);
maybe_null= 1; /* If NULL supplied only */
switch (int_type) {
case INTERVAL_YEAR: max_length=4; date_value=1; break;
case INTERVAL_YEAR_MONTH: max_length=6; date_value=1; break;
case INTERVAL_QUARTER: max_length=2; date_value=1; break;
case INTERVAL_MONTH: max_length=2; date_value=1; break;
case INTERVAL_WEEK: max_length=2; date_value=1; break;
case INTERVAL_DAY: max_length=2; date_value=1; break;
case INTERVAL_DAY_HOUR: max_length=9; date_value=0; break;
case INTERVAL_DAY_MINUTE: max_length=11; date_value=0; break;
case INTERVAL_DAY_SECOND: max_length=13; date_value=0; break;
case INTERVAL_HOUR: max_length=2; date_value=0; break;
case INTERVAL_HOUR_MINUTE: max_length=4; date_value=0; break;
case INTERVAL_HOUR_SECOND: max_length=6; date_value=0; break;
case INTERVAL_MINUTE: max_length=2; date_value=0; break;
case INTERVAL_MINUTE_SECOND: max_length=4; date_value=0; break;
case INTERVAL_SECOND: max_length=2; date_value=0; break;
case INTERVAL_MICROSECOND: max_length=2; date_value=0; break;
case INTERVAL_DAY_MICROSECOND: max_length=20; date_value=0; break;
case INTERVAL_HOUR_MICROSECOND: max_length=13; date_value=0; break;
case INTERVAL_MINUTE_MICROSECOND: max_length=11; date_value=0; break;
case INTERVAL_SECOND_MICROSECOND: max_length=9; date_value=0; break;
case INTERVAL_LAST: assert(0); break;
}
}
int64_t Item_extract::val_int()
{
assert(fixed);
if (args[0]->is_null())
{
/* For NULL argument, we return a NULL result */
null_value= true;
return 0;
}
/* We could have either a datetime or a time.. */
DateTime datetime_temporal;
Time time_temporal;
/* Abstract pointer type we'll use in the final switch */
Temporal *temporal;
if (date_value)
{
/* Grab the first argument as a DateTime object */
Item_result arg0_result_type= args[0]->result_type();
switch (arg0_result_type)
{
case DECIMAL_RESULT:
/*
* For doubles supplied, interpret the arg as a string,
* so intentionally fall-through here...
* This allows us to accept double parameters like
* 19971231235959.01 and interpret it the way MySQL does:
* as a TIMESTAMP-like thing with a microsecond component.
* Ugh, but need to keep backwards-compat.
*/
case STRING_RESULT:
{
char buff[DRIZZLE_MAX_LENGTH_DATETIME_AS_STRING];
String tmp(buff,sizeof(buff), &my_charset_utf8_bin);
String *res= args[0]->val_str(&tmp);
if (res && (res != &tmp))
{
tmp.copy(*res);
}
if (! datetime_temporal.from_string(tmp.c_ptr(), tmp.length()))
{
/*
* Could not interpret the function argument as a temporal value,
* so throw an error and return 0
*/
my_error(ER_INVALID_DATETIME_VALUE, MYF(0), tmp.c_ptr());
return 0;
}
}
break;
case INT_RESULT:
if (datetime_temporal.from_int64_t(args[0]->val_int()))
break;
/* Intentionally fall-through on invalid conversion from integer */
default:
{
/*
* Could not interpret the function argument as a temporal value,
* so throw an error and return 0
*/
null_value= true;
char buff[DRIZZLE_MAX_LENGTH_DATETIME_AS_STRING];
String tmp(buff,sizeof(buff), &my_charset_utf8_bin);
String *res;
res= args[0]->val_str(&tmp);
if (res && (res != &tmp))
{
tmp.copy(*res);
}
my_error(ER_INVALID_DATETIME_VALUE, MYF(0), tmp.c_ptr());
return 0;
}
}
/*
* If we got here, we have a successfully converted DateTime temporal.
* Point our working temporal to this.
*/
temporal= &datetime_temporal;
}
else
{
/*
* Because of the ridiculous way in which MySQL handles
* TIME values (it does implicit integer -> string conversions
* but only for DATETIME, not TIME values) we must first
* try a conversion into a TIME from a string. If this
* fails, we fall back on a DATETIME conversion. This is
* necessary because of the fact that DateTime::from_string()
* looks first for DATETIME, then DATE regex matches. 6 consecutive
* numbers, say 231130, will match the DATE regex YYMMDD
* with no TIME part, but MySQL actually implicitly treats
* parameters to SECOND(), HOUR(), and MINUTE() as TIME-only
* values and matches 231130 as HHmmSS!
*
* Oh, and Brian Aker MADE me do this. :) --JRP
*/
char time_buff[DRIZZLE_MAX_LENGTH_DATETIME_AS_STRING];
String tmp_time(time_buff,sizeof(time_buff), &my_charset_utf8_bin);
String *time_res= args[0]->val_str(&tmp_time);
if (time_res && (time_res != &tmp_time))
{
tmp_time.copy(*time_res);
}
if (! time_temporal.from_string(tmp_time.c_ptr(), tmp_time.length()))
{
/*
* OK, we failed to match the first argument as a string
* representing a time value, so we grab the first argument
* as a DateTime object and try that for a match...
*/
Item_result arg0_result_type= args[0]->result_type();
switch (arg0_result_type)
{
case DECIMAL_RESULT:
/*
* For doubles supplied, interpret the arg as a string,
* so intentionally fall-through here...
* This allows us to accept double parameters like
* 19971231235959.01 and interpret it the way MySQL does:
* as a TIMESTAMP-like thing with a microsecond component.
* Ugh, but need to keep backwards-compat.
*/
case STRING_RESULT:
{
char buff[DRIZZLE_MAX_LENGTH_DATETIME_AS_STRING];
String tmp(buff,sizeof(buff), &my_charset_utf8_bin);
String *res= args[0]->val_str(&tmp);
if (res && (res != &tmp))
{
tmp.copy(*res);
}
if (! datetime_temporal.from_string(tmp.c_ptr(), tmp.length()))
{
/*
* Could not interpret the function argument as a temporal value,
* so throw an error and return 0
*/
my_error(ER_INVALID_DATETIME_VALUE, MYF(0), tmp.c_ptr());
return 0;
}
}
break;
case INT_RESULT:
if (datetime_temporal.from_int64_t(args[0]->val_int()))
break;
/* Intentionally fall-through on invalid conversion from integer */
default:
{
/*
* Could not interpret the function argument as a temporal value,
* so throw an error and return 0
*/
null_value= true;
char buff[DRIZZLE_MAX_LENGTH_DATETIME_AS_STRING];
String tmp(buff,sizeof(buff), &my_charset_utf8_bin);
String *res;
res= args[0]->val_str(&tmp);
my_error(ER_INVALID_DATETIME_VALUE, MYF(0), res->c_ptr());
return 0;
}
}
/* If we're here, our time failed, but our datetime succeeded... */
temporal= &datetime_temporal;
}
else
{
/* If we're here, our time succeeded... */
temporal= &time_temporal;
}
}
/* Return the requested datetime component */
switch (int_type) {
case INTERVAL_YEAR:
return (int64_t) temporal->years();
case INTERVAL_YEAR_MONTH:
return (int64_t) ((temporal->years() * 100L) + temporal->months());
case INTERVAL_QUARTER:
return (int64_t) (temporal->months() + 2) / 3;
case INTERVAL_MONTH:
return (int64_t) temporal->months();
case INTERVAL_WEEK:
return iso_week_number_from_gregorian_date(temporal->years()
, temporal->months()
, temporal->days());
case INTERVAL_DAY:
return (int64_t) temporal->days();
case INTERVAL_DAY_HOUR:
return (int64_t) ((temporal->days() * 100L) + temporal->hours());
case INTERVAL_DAY_MINUTE:
return (int64_t) ((temporal->days() * 10000L)
+ (temporal->hours() * 100L)
+ temporal->minutes());
case INTERVAL_DAY_SECOND:
return (int64_t) (
(int64_t) (temporal->days() * 1000000L)
+ (int64_t) (temporal->hours() * 10000L)
+ (temporal->minutes() * 100L)
+ temporal->seconds());
case INTERVAL_HOUR:
return (int64_t) temporal->hours();
case INTERVAL_HOUR_MINUTE:
return (int64_t) (temporal->hours() * 100L)
+ temporal->minutes();
case INTERVAL_HOUR_SECOND:
return (int64_t) (temporal->hours() * 10000L)
+ (temporal->minutes() * 100L)
+ temporal->seconds();
case INTERVAL_MINUTE:
return (int64_t) temporal->minutes();
case INTERVAL_MINUTE_SECOND:
return (int64_t) (temporal->minutes() * 100L) + temporal->seconds();
case INTERVAL_SECOND:
return (int64_t) temporal->seconds();
case INTERVAL_MICROSECOND:
return (int64_t) temporal->useconds();
case INTERVAL_DAY_MICROSECOND:
return (int64_t)
(
(
(int64_t) (temporal->days() * 1000000L)
+ (int64_t) (temporal->hours() * 10000L)
+ (temporal->minutes() * 100L)
+ temporal->seconds()
)
* 1000000L
)
+ temporal->useconds();
case INTERVAL_HOUR_MICROSECOND:
return (int64_t)
(
(
(int64_t) (temporal->hours() * 10000L)
+ (temporal->minutes() * 100L)
+ temporal->seconds()
)
* 1000000L
)
+ temporal->useconds();
case INTERVAL_MINUTE_MICROSECOND:
return (int64_t)
(
(
(temporal->minutes() * 100L)
+ temporal->seconds()
)
* 1000000L
)
+ temporal->useconds();
case INTERVAL_SECOND_MICROSECOND:
return (int64_t) (temporal->seconds() * 1000000L)
+ temporal->useconds();
case INTERVAL_LAST:
default:
assert(0);
return 0;
}
}
bool Item_extract::eq(const Item *item, bool binary_cmp) const
{
if (this == item)
return 1;
if (item->type() != FUNC_ITEM ||
functype() != ((Item_func*)item)->functype())
return 0;
Item_extract* ie= (Item_extract*)item;
if (ie->int_type != int_type)
return 0;
if (!args[0]->eq(ie->args[0], binary_cmp))
return 0;
return 1;
}
} /* namespace drizzled */
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