Drizzled Public API Documentation

cache_str.cc
1 /* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
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3  *
4  * Copyright (C) 2008 Sun Microsystems, Inc.
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13  * GNU General Public License for more details.
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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 
22 #include <drizzled/item/cache_str.h>
23 #include <drizzled/field.h>
24 
25 namespace drizzled {
26 
27 Item_cache_str::Item_cache_str(const Item *item) :
28  Item_cache(), value(0),
29  is_varbinary(item->type() == FIELD_ITEM &&
30  ((const Item_field *) item)->field->type() ==
31  DRIZZLE_TYPE_VARCHAR &&
32  !((const Item_field *) item)->field->has_charset())
33 {}
34 
35 void Item_cache_str::store(Item *item)
36 {
37  value_buff.set(buffer, sizeof(buffer), item->collation.collation);
38  value= item->str_result(&value_buff);
39  if ((null_value= item->null_value))
40  value= 0;
41  else if (value != &value_buff)
42  {
43  /*
44  We copy string value to avoid changing value if 'item' is table field
45  in queries like following (where t1.c is varchar):
46  select a,
47  (select a,b,c from t1 where t1.a=t2.a) = ROW(a,2,'a'),
48  (select c from t1 where a=t2.a)
49  from t2;
50  */
51  value_buff.copy(*value);
52  value= &value_buff;
53  }
54 }
55 
57 {
58  assert(fixed == 1);
59  int err_not_used;
60  char *end_not_used;
61  if (value)
62  return my_strntod(value->charset(), (char*) value->ptr(),
63  value->length(), &end_not_used, &err_not_used);
64  return (double) 0;
65 }
66 
67 
69 {
70  assert(fixed == 1);
71  int err;
72  if (value)
73  return my_strntoll(value->charset(), value->ptr(),
74  value->length(), 10, (char**) 0, &err);
75  else
76  return 0;
77 }
78 
80 {
81  assert(fixed == 1);
82  if (value)
83  decimal_val->store(E_DEC_FATAL_ERROR, value);
84  else
85  decimal_val= 0;
86  return decimal_val;
87 }
88 
89 int Item_cache_str::save_in_field(Field *field, bool no_conversions)
90 {
91  return Item_cache::save_in_field(field, no_conversions);
92 }
93 
94 } /* namespace drizzled */