1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
|
/* Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA */
#include "datadict.h"
#include "sql_priv.h"
#include "sql_class.h"
#include "sql_table.h"
/**
Check type of .frm if we are not going to parse it.
@param[in] thd The current session.
@param[in] path path to FRM file.
@param[out] dbt db_type of the table if FRMTYPE_TABLE, otherwise undefined.
@retval FRMTYPE_ERROR error
@retval FRMTYPE_TABLE table
@retval FRMTYPE_VIEW view
*/
frm_type_enum dd_frm_type(THD *thd, char *path, enum legacy_db_type *dbt)
{
File file;
uchar header[10]; //"TYPE=VIEW\n" it is 10 characters
size_t error;
frm_type_enum type= FRMTYPE_ERROR;
DBUG_ENTER("dd_frm_type");
*dbt= DB_TYPE_UNKNOWN;
if ((file= mysql_file_open(key_file_frm, path, O_RDONLY | O_SHARE, MYF(0))) < 0)
DBUG_RETURN(FRMTYPE_ERROR);
error= mysql_file_read(file, (uchar*) header, sizeof(header), MYF(MY_NABP));
if (error)
goto err;
if (!strncmp((char*) header, "TYPE=VIEW\n", sizeof(header)))
{
type= FRMTYPE_VIEW;
goto err;
}
type= FRMTYPE_TABLE;
/*
This is just a check for DB_TYPE. We'll return default unknown type
if the following test is true (arg #3). This should not have effect
on return value from this function (default FRMTYPE_TABLE)
*/
if (header[0] != (uchar) 254 || header[1] != 1 ||
(header[2] != FRM_VER && header[2] != FRM_VER+1 &&
(header[2] < FRM_VER+3 || header[2] > FRM_VER+4)))
goto err;
*dbt= (enum legacy_db_type) (uint) *(header + 3);
if (*dbt >= DB_TYPE_FIRST_DYNAMIC) /* read the true engine name */
{
MY_STAT state;
uchar *frm_image= 0;
uint n_length;
if (mysql_file_fstat(file, &state, MYF(MY_WME)))
goto err;
if (mysql_file_seek(file, 0, SEEK_SET, MYF(MY_WME)))
goto err;
if (read_string(file, &frm_image, state.st_size))
goto err;
if ((n_length= uint4korr(frm_image+55)))
{
uint record_offset= (uint2korr(frm_image+6)+
((uint2korr(frm_image+14) == 0xffff ?
uint4korr(frm_image+47) : uint2korr(frm_image+14))));
uint reclength= uint2korr(frm_image+16);
uchar *next_chunk= frm_image + record_offset + reclength;
uchar *buff_end= next_chunk + n_length;
uint connect_string_length= uint2korr(next_chunk);
next_chunk+= connect_string_length + 2;
if (next_chunk + 2 < buff_end)
{
uint str_db_type_length= uint2korr(next_chunk);
LEX_STRING name;
name.str= (char*) next_chunk + 2;
name.length= str_db_type_length;
plugin_ref tmp_plugin= ha_resolve_by_name(thd, &name);
if (tmp_plugin)
*dbt= plugin_data(tmp_plugin, handlerton *)->db_type;
else
*dbt= DB_TYPE_UNKNOWN;
}
}
my_free(frm_image);
}
/* Probably a table. */
err:
mysql_file_close(file, MYF(MY_WME));
DBUG_RETURN(type);
}
/**
Given a table name, check type of .frm and legacy table type.
@param[in] thd The current session.
@param[in] db Table schema.
@param[in] table_name Table database.
@param[out] table_type handlerton of the table if FRMTYPE_TABLE,
otherwise undefined.
@return FALSE if FRMTYPE_TABLE and storage engine found. TRUE otherwise.
*/
bool dd_frm_storage_engine(THD *thd, const char *db, const char *table_name,
handlerton **table_type)
{
char path[FN_REFLEN + 1];
enum legacy_db_type db_type;
LEX_STRING db_name = {(char *) db, strlen(db)};
/* There should be at least some lock on the table. */
DBUG_ASSERT(thd->mdl_context.is_lock_owner(MDL_key::TABLE, db,
table_name, MDL_SHARED));
if (check_db_name(&db_name))
{
my_error(ER_WRONG_DB_NAME, MYF(0), db_name.str);
return TRUE;
}
if (check_table_name(table_name, strlen(table_name), FALSE))
{
my_error(ER_WRONG_TABLE_NAME, MYF(0), table_name);
return TRUE;
}
(void) build_table_filename(path, sizeof(path) - 1, db,
table_name, reg_ext, 0);
dd_frm_type(thd, path, &db_type);
/* Type is unknown if the object is not found or is not a table. */
if (db_type == DB_TYPE_UNKNOWN ||
!(*table_type= ha_resolve_by_legacy_type(thd, db_type)))
{
my_error(ER_NO_SUCH_TABLE, MYF(0), db, table_name);
return TRUE;
}
return FALSE;
}
/**
Given a table name, check if the storage engine for the
table referred by this name supports an option 'flag'.
Return an error if the table does not exist or is not a
base table.
@pre Any metadata lock on the table.
@param[in] thd The current session.
@param[in] db Table schema.
@param[in] table_name Table database.
@param[in] flag The option to check.
@param[out] yes_no The result. Undefined if error.
*/
bool dd_check_storage_engine_flag(THD *thd,
const char *db, const char *table_name,
uint32 flag, bool *yes_no)
{
handlerton *table_type;
if (dd_frm_storage_engine(thd, db, table_name, &table_type))
return TRUE;
*yes_no= ha_check_storage_engine_flag(table_type, flag);
return FALSE;
}
/*
Regenerate a metadata locked table.
@param thd Thread context.
@param db Name of the database to which the table belongs to.
@param name Table name.
@retval FALSE Success.
@retval TRUE Error.
*/
bool dd_recreate_table(THD *thd, const char *db, const char *table_name)
{
bool error= TRUE;
HA_CREATE_INFO create_info;
char path[FN_REFLEN + 1];
DBUG_ENTER("dd_recreate_table");
/* There should be a exclusive metadata lock on the table. */
DBUG_ASSERT(thd->mdl_context.is_lock_owner(MDL_key::TABLE, db, table_name,
MDL_EXCLUSIVE));
memset(&create_info, 0, sizeof(create_info));
/* Create a path to the table, but without a extension. */
build_table_filename(path, sizeof(path) - 1, db, table_name, "", 0);
/* Attempt to reconstruct the table. */
error= ha_create_table(thd, path, db, table_name, &create_info, TRUE);
DBUG_RETURN(error);
}
|
