Drizzled Public API Documentation

ident.h
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 #pragma once
21 
22 #include <drizzled/item.h>
23 
24 namespace drizzled {
25 
26 class Item_ident : public Item
27 {
28 protected:
29  /*
30  We have to store initial values of db_name, table_name and field_name
31  to be able to restore them during cleanup() because they can be
32  updated during fix_fields() to values from Field object and life-time
33  of those is shorter than life-time of Item_field.
34  */
35  const char *orig_db_name;
36  const char *orig_table_name;
37  const char *orig_field_name;
38 
39 public:
40  Name_resolution_context *context;
41  const char *db_name;
42  const char *table_name;
43  const char *field_name;
44  bool alias_name_used; /* true if item was resolved against alias */
45  /*
46  Cached value of index for this field in table->field array, used by prep.
47  stmts for speeding up their re-execution. Holds NO_CACHED_FIELD_INDEX
48  if index value is not known.
49  */
50  uint32_t cached_field_index;
51  /*
52  Cached pointer to table which contains this field, used for the same reason
53  by prep. stmt. too in case then we have not-fully qualified field.
54  0 - means no cached value.
55  */
56  TableList *cached_table;
57  Select_Lex *depended_from;
59  const char *db_name_arg, const char *table_name_arg,
60  const char *field_name_arg);
61  Item_ident(Session *session, Item_ident *item);
62  const char *full_name() const;
63  void cleanup();
64  bool remove_dependence_processor(unsigned char * arg);
65  virtual void print(String *str);
66  virtual bool change_context_processor(unsigned char *cntx)
67  { context= (Name_resolution_context *)cntx; return false; }
68  friend bool insert_fields(Session *session, Name_resolution_context *context,
69  const char *db_name,
70  const char *table_name, List<Item>::iterator *it,
71  bool any_privileges);
72 };
73 
74 
75 class Item_ident_for_show : public Item
76 {
77 public:
78  Field *field;
79  const char *db_name;
80  const char *table_name;
81 
82  Item_ident_for_show(Field *par_field, const char *db_arg,
83  const char *table_name_arg)
84  :field(par_field), db_name(db_arg), table_name(table_name_arg)
85  {}
86 
87  enum Type type() const { return FIELD_ITEM; }
88  double val_real();
89  int64_t val_int();
90  String *val_str(String *str);
92  void make_field(SendField *tmp_field);
93 };
94 
95 } /* namespace drizzled */
96 
virtual void print(String *str)
Definition: ident.cc:103
type::Decimal * val_decimal(type::Decimal *dec)
Definition: ident.cc:163
String * val_str(String *str)
Definition: ident.cc:157