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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/function/time/hour.h"
namespace drizzled
{
int64_t Item_func_hour::val_int()
{
assert(fixed);
if (args[0]->is_null())
{
/* For NULL argument, we return a NULL result */
null_value= true;
return 0;
}
/*
* 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
*/
Time temporal_time;
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 (! temporal_time.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...
*/
DateTime temporal_datetime;
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 (! temporal_datetime.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 (temporal_datetime.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;
}
}
return (int64_t) temporal_datetime.hours();
}
return (int64_t) temporal_time.hours();
}
} /* namespace drizzled */
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