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00020
00021 #pragma once
00022
00023 #include <string>
00024 #include <boost/dynamic_bitset.hpp>
00025
00026 #include <drizzled/memory/sql_alloc.h>
00027 #include <drizzled/key_part_spec.h>
00028 #include <drizzled/sql_list.h>
00029 #include <drizzled/lex_string.h>
00030 #include <drizzled/sql_string.h>
00031 #include <drizzled/handler_structs.h>
00032
00033 namespace drizzled
00034 {
00035
00036 namespace memory { class Root; }
00037
00038 class Item;
00039
00040 class Key :public memory::SqlAlloc {
00041 public:
00042 enum Keytype { PRIMARY, UNIQUE, MULTIPLE, FOREIGN_KEY};
00043 Keytype type;
00044 KEY_CREATE_INFO key_create_info;
00045 List<Key_part_spec> columns;
00046 LEX_STRING name;
00047 bool generated;
00048
00049 Key(Keytype type_par,
00050 const lex_string_t &name_arg,
00051 KEY_CREATE_INFO *key_info_arg,
00052 bool generated_arg, List<Key_part_spec> &cols) :
00053 type(type_par),
00054 key_create_info(*key_info_arg),
00055 columns(cols),
00056 name(name_arg),
00057 generated(generated_arg)
00058 {}
00059
00060 Key(Keytype type_par,
00061 const char *name_arg,
00062 size_t name_len_arg,
00063 KEY_CREATE_INFO *key_info_arg,
00064 bool generated_arg,
00065 List<Key_part_spec> &cols) :
00066 type(type_par),
00067 key_create_info(*key_info_arg),
00068 columns(cols),
00069 generated(generated_arg)
00070 {
00071 name.str= const_cast<char *>(name_arg);
00072 name.length= name_len_arg;
00073 }
00074
00075 virtual ~Key() {}
00076
00077 friend bool foreign_key_prefix(Key *a, Key *b);
00078 };
00079
00080
00081 int find_ref_key(KeyInfo *key, uint32_t key_count, unsigned char *record, Field *field,
00082 uint32_t *key_length, uint32_t *keypart);
00098 DRIZZLED_API void key_copy(unsigned char *to_key, unsigned char *from_record, KeyInfo *key_info, uint32_t key_length);
00099 void key_copy(std::basic_string<unsigned char> &to_key,
00100 unsigned char *from_record, KeyInfo *key_info, uint32_t key_length);
00101 void key_restore(unsigned char *to_record, unsigned char *from_key, KeyInfo *key_info,
00102 uint16_t key_length);
00103 void key_zero_nulls(unsigned char *tuple, KeyInfo *key_info);
00104 bool key_cmp_if_same(Table *form,const unsigned char *key,uint32_t index,uint32_t key_length);
00105 void key_unpack(String *to, const Table *form,uint32_t index);
00106 bool is_key_used(Table *table, uint32_t idx, const boost::dynamic_bitset<>& fields);
00107 int key_cmp(KeyPartInfo *key_part, const unsigned char *key, uint32_t key_length);
00108
00109 }
00110