45
typedef struct st_key KEY;
46
typedef struct st_key_cache KEY_CACHE;
45
51
class StorageEngine;
59
modified_non_trans_table(false)
62
/* true is not all entries in the engines[] support 2pc */
64
/* storage engines that registered in this transaction */
67
The purpose of this flag is to keep track of non-transactional
68
tables that were modified in scope of:
69
- transaction, when the variable is a member of
70
Session::transaction.all
71
- top-level statement or sub-statement, when the variable is a
72
member of Session::transaction.stmt
73
This member has the following life cycle:
74
* stmt.modified_non_trans_table is used to keep track of
75
modified non-transactional tables of top-level statements. At
76
the end of the previous statement and at the beginning of the session,
77
it is reset to false. If such functions
78
as mysql_insert, mysql_update, mysql_delete etc modify a
79
non-transactional table, they set this flag to true. At the
80
end of the statement, the value of stmt.modified_non_trans_table
81
is merged with all.modified_non_trans_table and gets reset.
82
* all.modified_non_trans_table is reset at the end of transaction
84
* Since we do not have a dedicated context for execution of a
85
sub-statement, to keep track of non-transactional changes in a
86
sub-statement, we re-use stmt.modified_non_trans_table.
87
At entrance into a sub-statement, a copy of the value of
88
stmt.modified_non_trans_table (containing the changes of the
89
outer statement) is saved on stack. Then
90
stmt.modified_non_trans_table is reset to false and the
91
substatement is executed. Then the new value is merged with the
94
bool modified_non_trans_table;
96
void reset() { no_2pc= false; modified_non_trans_table= false; }
48
99
typedef struct st_ha_create_information
50
101
const CHARSET_INFO *table_charset, *default_table_charset;
52
103
uint64_t auto_increment_value;
53
104
uint32_t table_options;
54
105
uint32_t used_fields;
106
enum row_type row_type;
55
107
plugin::StorageEngine *db_type;
56
108
bool table_existed; /* 1 in create if table existed */
58
st_ha_create_information() :
60
default_table_charset(0),
62
auto_increment_value(0),
70
111
typedef struct st_ha_alter_information
72
KeyInfo *key_info_buffer;
113
KEY *key_info_buffer;
73
114
uint32_t key_count;
74
115
uint32_t index_drop_count;
75
116
uint32_t *index_drop_buffer;
76
117
uint32_t index_add_count;
77
118
uint32_t *index_add_buffer;
80
st_ha_alter_information() :
136
166
uint32_t (*next) (range_seq_t seq, KEY_MULTI_RANGE *range);
170
This is a buffer area that the handler can use to store rows.
171
'end_of_used_area' should be kept updated after calls to
172
read-functions so that other parts of the code can use the
173
remaining area (until next read calls is issued).
176
typedef struct st_handler_buffer
178
unsigned char *buffer; /* Buffer one can start using */
179
unsigned char *buffer_end; /* End of buffer */
180
unsigned char *end_of_used_area; /* End of area that was used by handler */
139
183
} /* namespace drizzled */
141
185
#endif /* DRIZZLED_HANDLER_STRUCTS_H */