Drizzled Public API Documentation

from_days.cc
1 /* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
2  * vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
3  *
4  * Copyright (C) 2008 Sun Microsystems, Inc.
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation; version 2 of the License.
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11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13  * GNU General Public License for more details.
14  *
15  * You should have received a copy of the GNU General Public License
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17  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18  */
19 
20 #include <config.h>
21 #include <boost/lexical_cast.hpp>
22 #include <drizzled/function/time/from_days.h>
23 #include <drizzled/error.h>
24 #include <drizzled/temporal.h>
25 
26 #include <sstream>
27 #include <string>
28 
29 namespace drizzled
30 {
31 
37 {
38  assert(fixed);
39 
40  /*
41  * We MUST call val_int() before checking null_value because, stupidly,
42  * a subselect does not evaluate it's scalar items as null until val_xxx()
43  * has been called. :(
44  */
45  int64_t int_value= args[0]->val_int();
46 
47  /* We return NULL from FROM_DAYS() only when supplied a NULL argument */
48  if (args[0]->null_value)
49  {
50  null_value= true;
51  return false;
52  }
53 
54  /* OK, now try to convert from our integer */
55  if (! to.from_julian_day_number(int_value))
56  {
57  /* Bad input, throw an error */
58  std::string tmp(boost::lexical_cast<std::string>(int_value));
59 
60  my_error(ER_ARGUMENT_OUT_OF_RANGE, MYF(ME_FATALERROR), tmp.c_str(), func_name());
61  return false;
62  }
63  return true;
64 }
65 
66 } /* namespace drizzled */