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/* 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 02110-1301 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;
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));
mysql_file_close(file, MYF(MY_WME));
if (error)
DBUG_RETURN(FRMTYPE_ERROR);
if (!strncmp((char*) header, "TYPE=VIEW\n", sizeof(header)))
DBUG_RETURN(FRMTYPE_VIEW);
/*
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)))
DBUG_RETURN(FRMTYPE_TABLE);
*dbt= (enum legacy_db_type) (uint) *(header + 3);
/* Probably a table. */
DBUG_RETURN(FRMTYPE_TABLE);
}
/**
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);
}
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