Drizzled Public API Documentation

month.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.
9  *
10  * This program is distributed in the hope that it will be useful,
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
16  * along with this program; if not, write to the Free Software
17  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18  */
19 
20 #include <config.h>
21 
22 #include <drizzled/temporal.h>
23 #include <drizzled/error.h>
24 #include <drizzled/session.h>
25 #include <drizzled/function/time/month.h>
26 #include <drizzled/typelib.h>
27 #include <drizzled/system_variables.h>
28 
29 namespace drizzled {
30 
32 {
33  assert(fixed);
34 
35  if (args[0]->is_null())
36  {
37  /* For NULL argument, we return a NULL result */
38  null_value= true;
39  return 0;
40  }
41 
42  /* Grab the first argument as a DateTime object */
43  DateTime temporal;
44  Item_result arg0_result_type= args[0]->result_type();
45 
46  switch (arg0_result_type)
47  {
48  case DECIMAL_RESULT:
49  /*
50  * For doubles supplied, interpret the arg as a string,
51  * so intentionally fall-through here...
52  * This allows us to accept double parameters like
53  * 19971231235959.01 and interpret it the way MySQL does:
54  * as a TIMESTAMP-like thing with a microsecond component.
55  * Ugh, but need to keep backwards-compat.
56  */
57  case STRING_RESULT:
58  {
59  char buff[DRIZZLE_MAX_LENGTH_DATETIME_AS_STRING];
60  String tmp(buff,sizeof(buff), &my_charset_utf8_bin);
61  String *res= args[0]->val_str(&tmp);
62 
63  if (res && (res != &tmp))
64  {
65  tmp.copy(*res);
66  }
67 
68  if (! temporal.from_string(tmp.c_ptr(), tmp.length()))
69  {
70  /*
71  * Could not interpret the function argument as a temporal value,
72  * so throw an error and return 0
73  */
74  my_error(ER_INVALID_DATETIME_VALUE, MYF(0), tmp.c_ptr());
75  return 0;
76  }
77  }
78  break;
79  case INT_RESULT:
80  if (temporal.from_int64_t(args[0]->val_int()))
81  break;
82  /* Intentionally fall-through on invalid conversion from integer */
83  default:
84  {
85  /*
86  * Could not interpret the function argument as a temporal value,
87  * so throw an error and return 0
88  */
89  null_value= true;
90  char buff[DRIZZLE_MAX_LENGTH_DATETIME_AS_STRING];
91  String tmp(buff,sizeof(buff), &my_charset_utf8_bin);
92  String *res;
93 
94  res= args[0]->val_str(&tmp);
95 
96  if (res && (res != &tmp))
97  {
98  tmp.copy(*res);
99  }
100 
101  my_error(ER_INVALID_DATETIME_VALUE, MYF(0), tmp.c_ptr());
102  return 0;
103  }
104  }
105  return (int64_t) temporal.months();
106 }
107 
109 {
110  assert(fixed);
111 
112  if (args[0]->is_null())
113  {
114  /* For NULL argument, we return a NULL result */
115  null_value= true;
116  return (String *) 0;
117  }
118  const char *month_name;
119  uint32_t month= (uint) val_int();
120 
121  if (null_value || !month)
122  {
123  null_value=1;
124  return (String*) 0;
125  }
126  null_value=0;
127  month_name= getSession().variables.lc_time_names->month_names->type_names[month-1];
128  str->set(month_name, strlen(month_name), system_charset_info);
129  return str;
130 }
131 
132 } /* namespace drizzled */
bool from_string(const char *from, size_t from_len)
Definition: temporal.cc:160
virtual int64_t val_int()=0
bool fixed
Definition: item.h:120
uint32_t months() const
Definition: temporal.h:146
bool null_value
Definition: item.h:122
bool from_int64_t(const int64_t from, bool convert)
Definition: temporal.cc:1144
bool is_null()
Definition: func.cc:512
virtual String * val_str(String *str)=0
String * val_str(String *str)
Definition: month.cc:108
drizzle_system_variables & variables
Definition: session.h:199