/
sql_view.cc
2206 lines (1921 loc) · 67.2 KB
/
sql_view.cc
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/* Copyright (c) 2004, 2013, Oracle and/or its affiliates.
Copyright (c) 2011, 2016, MariaDB Corporation
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 Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
#define MYSQL_LEX 1
#include <my_global.h> /* NO_EMBEDDED_ACCESS_CHECKS */
#include "sql_priv.h"
#include "unireg.h"
#include "sql_view.h"
#include "sql_base.h" // find_table_in_global_list, lock_table_names
#include "sql_parse.h" // sql_parse
#include "sql_cache.h" // query_cache_*
#include "lock.h" // MYSQL_OPEN_SKIP_TEMPORARY
#include "sql_show.h" // append_identifier
#include "sql_table.h" // build_table_filename
#include "sql_db.h" // mysql_opt_change_db, mysql_change_db
#include "sql_acl.h" // *_ACL, check_grant
#include "sql_select.h"
#include "parse_file.h"
#include "sp_head.h"
#include "sp.h"
#include "sp_cache.h"
#include "datadict.h" // dd_frm_is_view()
#include "sql_derived.h"
#include "sql_cte.h" // check_dependencies_in_with_clauses()
#define MD5_BUFF_LENGTH 33
const LEX_STRING view_type= { C_STRING_WITH_LEN("VIEW") };
static int mysql_register_view(THD *, TABLE_LIST *, enum_view_create_mode);
/*
Make a unique name for an anonymous view column
SYNOPSIS
target reference to the item for which a new name has to be made
item_list list of items within which we should check uniqueness of
the created name
last_element the last element of the list above
NOTE
Unique names are generated by adding 'My_exp_' to the old name of the
column. In case the name that was created this way already exists, we
add a numeric postfix to its end (i.e. "1") and increase the number
until the name becomes unique. If the generated name is longer than
NAME_LEN, it is truncated.
*/
static void make_unique_view_field_name(THD *thd, Item *target,
List<Item> &item_list,
Item *last_element)
{
char *name= (target->orig_name ?
target->orig_name :
target->name);
size_t name_len;
uint attempt;
char buff[NAME_LEN+1];
List_iterator_fast<Item> itc(item_list);
for (attempt= 0;; attempt++)
{
Item *check;
bool ok= TRUE;
if (attempt)
name_len= my_snprintf(buff, NAME_LEN, "My_exp_%d_%s", attempt, name);
else
name_len= my_snprintf(buff, NAME_LEN, "My_exp_%s", name);
do
{
check= itc++;
if (check != target &&
my_strcasecmp(system_charset_info, buff, check->name) == 0)
{
ok= FALSE;
break;
}
} while (check != last_element);
if (ok)
break;
itc.rewind();
}
target->orig_name= target->name;
target->set_name(thd, buff, name_len, system_charset_info);
}
/*
Check if items with same names are present in list and possibly
generate unique names for them.
SYNOPSIS
item_list list of Items which should be checked for duplicates
gen_unique_view_name flag: generate unique name or return with error when
duplicate names are found.
DESCRIPTION
This function is used on view creation and preparation of derived tables.
It checks item_list for items with duplicate names. If it founds two
items with same name and conversion to unique names isn't allowed, or
names for both items are set by user - function fails.
Otherwise it generates unique name for one item with autogenerated name
using make_unique_view_field_name()
RETURN VALUE
FALSE no duplicate names found, or they are converted to unique ones
TRUE duplicate names are found and they can't be converted or conversion
isn't allowed
*/
bool check_duplicate_names(THD *thd, List<Item> &item_list, bool gen_unique_view_name)
{
Item *item;
List_iterator_fast<Item> it(item_list);
List_iterator_fast<Item> itc(item_list);
DBUG_ENTER("check_duplicate_names");
while ((item= it++))
{
Item *check;
/* treat underlying fields like set by user names */
if (item->real_item()->type() == Item::FIELD_ITEM)
item->is_autogenerated_name= FALSE;
itc.rewind();
while ((check= itc++) && check != item)
{
if (my_strcasecmp(system_charset_info, item->name, check->name) == 0)
{
if (!gen_unique_view_name)
goto err;
if (item->is_autogenerated_name)
make_unique_view_field_name(thd, item, item_list, item);
else if (check->is_autogenerated_name)
make_unique_view_field_name(thd, check, item_list, item);
else
goto err;
}
}
}
DBUG_RETURN(FALSE);
err:
my_error(ER_DUP_FIELDNAME, MYF(0), item->name);
DBUG_RETURN(TRUE);
}
/**
Check if auto generated column names are conforming and
possibly generate a conforming name for them if not.
@param item_list List of Items which should be checked
*/
void make_valid_column_names(THD *thd, List<Item> &item_list)
{
Item *item;
uint name_len;
List_iterator_fast<Item> it(item_list);
char buff[NAME_LEN];
DBUG_ENTER("make_valid_column_names");
for (uint column_no= 1; (item= it++); column_no++)
{
if (!item->is_autogenerated_name || !check_column_name(item->name))
continue;
name_len= my_snprintf(buff, NAME_LEN, "Name_exp_%u", column_no);
item->orig_name= item->name;
item->set_name(thd, buff, name_len, system_charset_info);
}
DBUG_VOID_RETURN;
}
/*
Fill defined view parts
SYNOPSIS
fill_defined_view_parts()
thd current thread.
view view to operate on
DESCRIPTION
This function will initialize the parts of the view
definition that are not specified in ALTER VIEW
to their values from CREATE VIEW.
The view must be opened to get its definition.
We use a copy of the view when opening because we want
to preserve the original view instance.
RETURN VALUE
TRUE can't open table
FALSE success
*/
static bool
fill_defined_view_parts (THD *thd, TABLE_LIST *view)
{
LEX *lex= thd->lex;
TABLE_LIST decoy;
memcpy (&decoy, view, sizeof (TABLE_LIST));
if (tdc_open_view(thd, &decoy, OPEN_VIEW_NO_PARSE))
return TRUE;
if (!lex->definer)
{
view->definer.host= decoy.definer.host;
view->definer.user= decoy.definer.user;
lex->definer= &view->definer;
}
if (lex->create_view_algorithm == VIEW_ALGORITHM_INHERIT)
lex->create_view_algorithm= (uint8) decoy.algorithm;
if (lex->create_view_suid == VIEW_SUID_DEFAULT)
lex->create_view_suid= decoy.view_suid ?
VIEW_SUID_DEFINER : VIEW_SUID_INVOKER;
return FALSE;
}
#ifndef NO_EMBEDDED_ACCESS_CHECKS
/**
@brief CREATE VIEW privileges pre-check.
@param thd thread handler
@param tables tables used in the view
@param views views to create
@param mode VIEW_CREATE_NEW, VIEW_ALTER, VIEW_CREATE_OR_REPLACE
@retval FALSE Operation was a success.
@retval TRUE An error occurred.
*/
bool create_view_precheck(THD *thd, TABLE_LIST *tables, TABLE_LIST *view,
enum_view_create_mode mode)
{
LEX *lex= thd->lex;
/* first table in list is target VIEW name => cut off it */
TABLE_LIST *tbl;
SELECT_LEX *select_lex= &lex->select_lex;
SELECT_LEX *sl;
bool res= TRUE;
DBUG_ENTER("create_view_precheck");
/*
Privilege check for view creation:
- user has CREATE VIEW privilege on view table
- user has DROP privilege in case of ALTER VIEW or CREATE OR REPLACE
VIEW
- user has some (SELECT/UPDATE/INSERT/DELETE) privileges on columns of
underlying tables used on top of SELECT list (because it can be
(theoretically) updated, so it is enough to have UPDATE privilege on
them, for example)
- user has SELECT privilege on columns used in expressions of VIEW select
- for columns of underly tables used on top of SELECT list also will be
checked that we have not more privileges on correspondent column of view
table (i.e. user will not get some privileges by view creation)
*/
if ((check_access(thd, CREATE_VIEW_ACL, view->db,
&view->grant.privilege,
&view->grant.m_internal,
0, 0) ||
check_grant(thd, CREATE_VIEW_ACL, view, FALSE, 1, FALSE)) ||
(mode != VIEW_CREATE_NEW &&
(check_access(thd, DROP_ACL, view->db,
&view->grant.privilege,
&view->grant.m_internal,
0, 0) ||
check_grant(thd, DROP_ACL, view, FALSE, 1, FALSE))))
goto err;
for (sl= select_lex; sl; sl= sl->next_select())
{
for (tbl= sl->get_table_list(); tbl; tbl= tbl->next_local)
{
/*
Ensure that we have some privileges on this table, more strict check
will be done on column level after preparation,
*/
if (check_some_access(thd, VIEW_ANY_ACL, tbl))
{
my_error(ER_TABLEACCESS_DENIED_ERROR, MYF(0),
"ANY", thd->security_ctx->priv_user,
thd->security_ctx->priv_host, tbl->table_name);
goto err;
}
/*
Mark this table as a table which will be checked after the prepare
phase
*/
tbl->table_in_first_from_clause= 1;
/*
We need to check only SELECT_ACL for all normal fields, fields for
which we need "any" (SELECT/UPDATE/INSERT/DELETE) privilege will be
checked later
*/
tbl->grant.want_privilege= SELECT_ACL;
/*
Make sure that all rights are loaded to the TABLE::grant field.
tbl->table_name will be correct name of table because VIEWs are
not opened yet.
*/
fill_effective_table_privileges(thd, &tbl->grant, tbl->db,
tbl->table_name);
}
}
if (&lex->select_lex != lex->all_selects_list)
{
/* check tables of subqueries */
for (tbl= tables; tbl; tbl= tbl->next_global)
{
if (!tbl->table_in_first_from_clause)
{
if (check_access(thd, SELECT_ACL, tbl->db,
&tbl->grant.privilege,
&tbl->grant.m_internal,
0, 0) ||
check_grant(thd, SELECT_ACL, tbl, FALSE, 1, FALSE))
goto err;
}
}
}
/*
Mark fields for special privilege check ("any" privilege)
*/
for (sl= select_lex; sl; sl= sl->next_select())
{
List_iterator_fast<Item> it(sl->item_list);
Item *item;
while ((item= it++))
{
Item_field *field;
if ((field= item->field_for_view_update()))
{
/*
any_privileges may be reset later by the Item_field::set_field
method in case of a system temporary table.
*/
field->any_privileges= 1;
}
}
}
res= FALSE;
err:
DBUG_RETURN(res || thd->is_error());
}
#else
bool create_view_precheck(THD *thd, TABLE_LIST *tables, TABLE_LIST *view,
enum_view_create_mode mode)
{
return FALSE;
}
#endif
/**
@brief Creating/altering VIEW procedure
@param thd thread handler
@param views views to create
@param mode VIEW_CREATE_NEW, VIEW_ALTER, VIEW_CREATE_OR_REPLACE
@note This function handles both create and alter view commands.
@retval FALSE Operation was a success.
@retval TRUE An error occurred.
*/
bool mysql_create_view(THD *thd, TABLE_LIST *views,
enum_view_create_mode mode)
{
LEX *lex= thd->lex;
bool link_to_local;
/* first table in list is target VIEW name => cut off it */
TABLE_LIST *view= lex->unlink_first_table(&link_to_local);
TABLE_LIST *tables= lex->query_tables;
TABLE_LIST *tbl;
SELECT_LEX *select_lex= &lex->select_lex;
SELECT_LEX *sl;
SELECT_LEX_UNIT *unit= &lex->unit;
bool res= FALSE;
DBUG_ENTER("mysql_create_view");
/* This is ensured in the parser. */
DBUG_ASSERT(!lex->proc_list.first && !lex->result &&
!lex->param_list.elements);
/*
We can't allow taking exclusive meta-data locks of unlocked view under
LOCK TABLES since this might lead to deadlock. Since at the moment we
can't really lock view with LOCK TABLES we simply prohibit creation/
alteration of views under LOCK TABLES.
*/
if (thd->locked_tables_mode)
{
my_error(ER_LOCK_OR_ACTIVE_TRANSACTION, MYF(0));
res= TRUE;
goto err;
}
if ((res= create_view_precheck(thd, tables, view, mode)))
goto err;
lex->link_first_table_back(view, link_to_local);
view->open_type= OT_BASE_ONLY;
if (check_dependencies_in_with_clauses(lex->with_clauses_list))
{
res= TRUE;
goto err;
}
/*
ignore lock specs for CREATE statement
*/
if (lex->current_select->lock_type != TL_READ_DEFAULT)
{
lex->current_select->set_lock_for_tables(TL_READ_DEFAULT);
view->mdl_request.set_type(MDL_EXCLUSIVE);
}
if (thd->open_temporary_tables(lex->query_tables) ||
open_and_lock_tables(thd, lex->query_tables, TRUE, 0))
{
view= lex->unlink_first_table(&link_to_local);
res= TRUE;
goto err;
}
view= lex->unlink_first_table(&link_to_local);
if (check_db_dir_existence(view->db))
{
my_error(ER_BAD_DB_ERROR, MYF(0), view->db);
res= TRUE;
goto err;
}
if (mode == VIEW_ALTER && fill_defined_view_parts(thd, view))
{
res= TRUE;
goto err;
}
if (lex->limit_rows_examined)
{
/*
LIMIT ROWS EXAMINED is not supported inside views to avoid complicated
side-effects and semantics of the clause.
*/
my_error(ER_NOT_SUPPORTED_YET, MYF(0), "LIMIT ROWS EXAMINED inside views");
res= TRUE;
goto err;
}
sp_cache_invalidate();
if (sp_process_definer(thd))
goto err;
/*
check that tables are not temporary and this VIEW do not used in query
(it is possible with ALTERing VIEW).
open_and_lock_tables can change the value of tables,
e.g. it may happen if before the function call tables was equal to 0.
*/
for (tbl= lex->query_tables; tbl; tbl= tbl->next_global)
{
/* is this table view and the same view which we creates now? */
if (tbl->view &&
strcmp(tbl->view_db.str, view->db) == 0 &&
strcmp(tbl->view_name.str, view->table_name) == 0)
{
my_error(ER_NO_SUCH_TABLE, MYF(0), tbl->view_db.str, tbl->view_name.str);
res= TRUE;
goto err;
}
/*
tbl->table can be NULL when tbl is a placeholder for a view
that is indirectly referenced via a stored function from the
view being created. We don't check these indirectly
referenced views in CREATE VIEW so they don't have table
object.
*/
if (tbl->table)
{
/* is this table temporary and is not view? */
if (tbl->table->s->tmp_table != NO_TMP_TABLE && !tbl->view &&
!tbl->schema_table)
{
my_error(ER_VIEW_SELECT_TMPTABLE, MYF(0), tbl->alias);
res= TRUE;
goto err;
}
/*
Copy the privileges of the underlying VIEWs which were filled by
fill_effective_table_privileges
(they were not copied at derived tables processing)
*/
tbl->table->grant.privilege= tbl->grant.privilege;
}
}
/* prepare select to resolve all fields */
lex->context_analysis_only|= CONTEXT_ANALYSIS_ONLY_VIEW;
if (unit->prepare(thd, 0, 0))
{
/*
some errors from prepare are reported to user, if is not then
it will be checked after err: label
*/
res= TRUE;
goto err;
}
/* view list (list of view fields names) */
if (lex->view_list.elements)
{
List_iterator_fast<Item> it(select_lex->item_list);
List_iterator_fast<LEX_STRING> nm(lex->view_list);
Item *item;
LEX_STRING *name;
if (lex->view_list.elements != select_lex->item_list.elements)
{
my_message(ER_VIEW_WRONG_LIST, ER_THD(thd, ER_VIEW_WRONG_LIST), MYF(0));
res= TRUE;
goto err;
}
while ((item= it++, name= nm++))
{
item->set_name(thd, name->str, (uint) name->length, system_charset_info);
item->is_autogenerated_name= FALSE;
}
}
/* Check if the auto generated column names are conforming. */
for (sl= select_lex; sl; sl= sl->next_select())
make_valid_column_names(thd, sl->item_list);
if (check_duplicate_names(thd, select_lex->item_list, 1))
{
res= TRUE;
goto err;
}
#ifndef NO_EMBEDDED_ACCESS_CHECKS
/*
Compare/check grants on view with grants of underlying tables
*/
fill_effective_table_privileges(thd, &view->grant, view->db,
view->table_name);
/*
Make sure that the current user does not have more column-level privileges
on the newly created view than he/she does on the underlying
tables. E.g. it must not be so that the user has UPDATE privileges on a
view column of he/she doesn't have it on the underlying table's
corresponding column. In that case, return an error for CREATE VIEW.
*/
{
Item *report_item= NULL;
/*
This will hold the intersection of the priviliges on all columns in the
view.
*/
uint final_priv= VIEW_ANY_ACL;
for (sl= select_lex; sl; sl= sl->next_select())
{
DBUG_ASSERT(view->db); /* Must be set in the parser */
List_iterator_fast<Item> it(sl->item_list);
Item *item;
while ((item= it++))
{
Item_field *fld= item->field_for_view_update();
uint priv= (get_column_grant(thd, &view->grant, view->db,
view->table_name, item->name) &
VIEW_ANY_ACL);
if (fld && !fld->field->table->s->tmp_table)
{
final_priv&= fld->have_privileges;
if (~fld->have_privileges & priv)
report_item= item;
}
}
}
if (!final_priv && report_item)
{
my_error(ER_COLUMNACCESS_DENIED_ERROR, MYF(0),
"create view", thd->security_ctx->priv_user,
thd->security_ctx->priv_host, report_item->name,
view->table_name);
res= TRUE;
goto err;
}
}
#endif
res= mysql_register_view(thd, view, mode);
/*
View TABLE_SHARE must be removed from the table definition cache in order to
make ALTER VIEW work properly. Otherwise, we would not be able to detect
meta-data changes after ALTER VIEW.
*/
if (!res)
tdc_remove_table(thd, TDC_RT_REMOVE_ALL, view->db, view->table_name, false);
if (!res && mysql_bin_log.is_open())
{
String buff;
const LEX_STRING command[3]=
{{ C_STRING_WITH_LEN("CREATE ") },
{ C_STRING_WITH_LEN("ALTER ") },
{ C_STRING_WITH_LEN("CREATE OR REPLACE ") }};
buff.append(command[thd->lex->create_view_mode].str,
command[thd->lex->create_view_mode].length);
view_store_options(thd, views, &buff);
buff.append(STRING_WITH_LEN("VIEW "));
/* Appending IF NOT EXISTS if present in the query */
if (lex->create_info.if_not_exists())
buff.append(STRING_WITH_LEN("IF NOT EXISTS "));
/* Test if user supplied a db (ie: we did not use thd->db) */
if (views->db && views->db[0] &&
(thd->db == NULL || strcmp(views->db, thd->db)))
{
append_identifier(thd, &buff, views->db,
views->db_length);
buff.append('.');
}
append_identifier(thd, &buff, views->table_name,
views->table_name_length);
if (lex->view_list.elements)
{
List_iterator_fast<LEX_STRING> names(lex->view_list);
LEX_STRING *name;
int i;
for (i= 0; (name= names++); i++)
{
buff.append(i ? ", " : "(");
append_identifier(thd, &buff, name->str, name->length);
}
buff.append(')');
}
buff.append(STRING_WITH_LEN(" AS "));
buff.append(views->source.str, views->source.length);
int errcode= query_error_code(thd, TRUE);
/*
Don't log any unsafe warnings for CREATE VIEW as it's safely replicated
with statement based replication
*/
thd->reset_unsafe_warnings();
if (thd->binlog_query(THD::STMT_QUERY_TYPE,
buff.ptr(), buff.length(), FALSE, FALSE, FALSE,
errcode))
res= TRUE;
}
if (mode != VIEW_CREATE_NEW)
query_cache_invalidate3(thd, view, 0);
if (res)
goto err;
my_ok(thd);
lex->link_first_table_back(view, link_to_local);
DBUG_RETURN(0);
err:
THD_STAGE_INFO(thd, stage_end);
lex->link_first_table_back(view, link_to_local);
unit->cleanup();
DBUG_RETURN(res || thd->is_error());
}
static void make_view_filename(LEX_STRING *dir, char *dir_buff,
size_t dir_buff_len,
LEX_STRING *path, char *path_buff,
size_t path_buff_len,
LEX_STRING *file,
TABLE_LIST *view)
{
/* print file name */
dir->length= build_table_filename(dir_buff, dir_buff_len - 1,
view->db, "", "", 0);
dir->str= dir_buff;
path->length= build_table_filename(path_buff, path_buff_len - 1,
view->db, view->table_name, reg_ext, 0);
path->str= path_buff;
file->str= path->str + dir->length;
file->length= path->length - dir->length;
}
/* number of required parameters for making view */
static const int required_view_parameters= 15;
/*
table of VIEW .frm field descriptors
Note that one should NOT change the order for this, as it's used by
parse()
*/
static File_option view_parameters[]=
{{{ C_STRING_WITH_LEN("query")},
my_offsetof(TABLE_LIST, select_stmt),
FILE_OPTIONS_ESTRING},
{{ C_STRING_WITH_LEN("md5")},
my_offsetof(TABLE_LIST, md5),
FILE_OPTIONS_STRING},
{{ C_STRING_WITH_LEN("updatable")},
my_offsetof(TABLE_LIST, updatable_view),
FILE_OPTIONS_ULONGLONG},
{{ C_STRING_WITH_LEN("algorithm")},
my_offsetof(TABLE_LIST, algorithm),
FILE_OPTIONS_VIEW_ALGO},
{{ C_STRING_WITH_LEN("definer_user")},
my_offsetof(TABLE_LIST, definer.user),
FILE_OPTIONS_STRING},
{{ C_STRING_WITH_LEN("definer_host")},
my_offsetof(TABLE_LIST, definer.host),
FILE_OPTIONS_STRING},
{{ C_STRING_WITH_LEN("suid")},
my_offsetof(TABLE_LIST, view_suid),
FILE_OPTIONS_ULONGLONG},
{{ C_STRING_WITH_LEN("with_check_option")},
my_offsetof(TABLE_LIST, with_check),
FILE_OPTIONS_ULONGLONG},
{{ C_STRING_WITH_LEN("timestamp")},
my_offsetof(TABLE_LIST, timestamp),
FILE_OPTIONS_TIMESTAMP},
{{ C_STRING_WITH_LEN("create-version")},
my_offsetof(TABLE_LIST, file_version),
FILE_OPTIONS_ULONGLONG},
{{ C_STRING_WITH_LEN("source")},
my_offsetof(TABLE_LIST, source),
FILE_OPTIONS_ESTRING},
{{(char*) STRING_WITH_LEN("client_cs_name")},
my_offsetof(TABLE_LIST, view_client_cs_name),
FILE_OPTIONS_STRING},
{{(char*) STRING_WITH_LEN("connection_cl_name")},
my_offsetof(TABLE_LIST, view_connection_cl_name),
FILE_OPTIONS_STRING},
{{(char*) STRING_WITH_LEN("view_body_utf8")},
my_offsetof(TABLE_LIST, view_body_utf8),
FILE_OPTIONS_ESTRING},
{{ C_STRING_WITH_LEN("mariadb-version")},
my_offsetof(TABLE_LIST, mariadb_version),
FILE_OPTIONS_ULONGLONG},
{{NullS, 0}, 0,
FILE_OPTIONS_STRING}
};
static LEX_STRING view_file_type[]= {{(char*) STRING_WITH_LEN("VIEW") }};
int mariadb_fix_view(THD *thd, TABLE_LIST *view, bool wrong_checksum,
bool swap_alg)
{
char dir_buff[FN_REFLEN + 1], path_buff[FN_REFLEN + 1];
LEX_STRING dir, file, path;
DBUG_ENTER("mariadb_fix_view");
if (!wrong_checksum && view->mariadb_version)
DBUG_RETURN(HA_ADMIN_OK);
make_view_filename(&dir, dir_buff, sizeof(dir_buff),
&path, path_buff, sizeof(path_buff),
&file, view);
/* init timestamp */
if (!view->timestamp.str)
view->timestamp.str= view->timestamp_buffer;
if (swap_alg && view->algorithm != VIEW_ALGORITHM_UNDEFINED)
{
DBUG_ASSERT(view->algorithm == VIEW_ALGORITHM_MERGE ||
view->algorithm == VIEW_ALGORITHM_TMPTABLE);
if (view->algorithm == VIEW_ALGORITHM_MERGE)
view->algorithm= VIEW_ALGORITHM_TMPTABLE;
else
view->algorithm= VIEW_ALGORITHM_MERGE;
}
else
swap_alg= 0;
if (wrong_checksum)
{
if (view->md5.length != 32)
{
if ((view->md5.str= (char *)thd->alloc(32 + 1)) == NULL)
DBUG_RETURN(HA_ADMIN_FAILED);
}
view->calc_md5(view->md5.str);
view->md5.length= 32;
}
view->mariadb_version= MYSQL_VERSION_ID;
if (sql_create_definition_file(&dir, &file, view_file_type,
(uchar*)view, view_parameters))
{
sql_print_error("View '%-.192s'.'%-.192s': algorithm swap error.",
view->db, view->table_name);
DBUG_RETURN(HA_ADMIN_INTERNAL_ERROR);
}
sql_print_information("View %`s.%`s: the version is set to %llu%s%s",
view->db, view->table_name, view->mariadb_version,
(wrong_checksum ? ", checksum corrected" : ""),
(swap_alg ?
((view->algorithm == VIEW_ALGORITHM_MERGE) ?
", algorithm restored to be MERGE"
: ", algorithm restored to be TEMPTABLE")
: ""));
DBUG_RETURN(HA_ADMIN_OK);
}
/*
Register VIEW (write .frm & process .frm's history backups)
SYNOPSIS
mysql_register_view()
thd - thread handler
view - view description
mode - VIEW_CREATE_NEW, VIEW_ALTER, VIEW_CREATE_OR_REPLACE
RETURN
0 OK
-1 Error
1 Error and error message given
*/
static int mysql_register_view(THD *thd, TABLE_LIST *view,
enum_view_create_mode mode)
{
LEX *lex= thd->lex;
/*
View definition query -- a SELECT statement that fully defines view. It
is generated from the Item-tree built from the original (specified by
the user) query. The idea is that generated query should eliminates all
ambiguities and fix view structure at CREATE-time (once for all).
Item::print() virtual operation is used to generate view definition
query.
INFORMATION_SCHEMA query (IS query) -- a SQL statement describing a
view that is shown in INFORMATION_SCHEMA. Basically, it is 'view
definition query' with text literals converted to UTF8 and without
character set introducers.
For example:
Let's suppose we have:
CREATE TABLE t1(a INT, b INT);
User specified query:
CREATE VIEW v1(x, y) AS SELECT * FROM t1;
Generated query:
SELECT a AS x, b AS y FROM t1;
IS query:
SELECT a AS x, b AS y FROM t1;
View definition query is stored in the client character set.
*/
char view_query_buff[4096];
String view_query(view_query_buff,
sizeof (view_query_buff),
thd->charset());
char is_query_buff[4096];
String is_query(is_query_buff,
sizeof (is_query_buff),
system_charset_info);
char md5[MD5_BUFF_LENGTH];
bool can_be_merged;
char dir_buff[FN_REFLEN + 1], path_buff[FN_REFLEN + 1];
LEX_STRING dir, file, path;
int error= 0;
DBUG_ENTER("mysql_register_view");
/* Generate view definition and IS queries. */
view_query.length(0);
is_query.length(0);
{
sql_mode_t sql_mode= thd->variables.sql_mode & MODE_ANSI_QUOTES;
thd->variables.sql_mode&= ~MODE_ANSI_QUOTES;
lex->unit.print(&view_query, enum_query_type(QT_VIEW_INTERNAL |
QT_ITEM_ORIGINAL_FUNC_NULLIF));
lex->unit.print(&is_query, enum_query_type(QT_TO_SYSTEM_CHARSET |
QT_WITHOUT_INTRODUCERS |
QT_ITEM_ORIGINAL_FUNC_NULLIF));
thd->variables.sql_mode|= sql_mode;
}
DBUG_PRINT("info", ("View: %.*s", view_query.length(), view_query.ptr()));
/* fill structure */
view->source= thd->lex->create_view_select;
if (!thd->make_lex_string(&view->select_stmt, view_query.ptr(),
view_query.length()))
{
my_error(ER_OUT_OF_RESOURCES, MYF(0));
error= -1;
goto err;
}
/*
version 1 - before 10.0.5
version 2 - empty definer_host means a role
*/
view->file_version= 2;
view->mariadb_version= MYSQL_VERSION_ID;
view->calc_md5(md5);
if (!(view->md5.str= (char*) thd->memdup(md5, 32)))
{
my_error(ER_OUT_OF_RESOURCES, MYF(0));
error= -1;
goto err;
}
view->md5.length= 32;
can_be_merged= lex->can_be_merged();
if (lex->create_view_algorithm == VIEW_ALGORITHM_MERGE &&
!lex->can_be_merged())
{
push_warning(thd, Sql_condition::WARN_LEVEL_WARN, ER_WARN_VIEW_MERGE,
ER_THD(thd, ER_WARN_VIEW_MERGE));
lex->create_view_algorithm= DTYPE_ALGORITHM_UNDEFINED;
}
view->algorithm= lex->create_view_algorithm;
view->definer.user= lex->definer->user;
view->definer.host= lex->definer->host;
view->view_suid= lex->create_view_suid;
view->with_check= lex->create_view_check;
DBUG_EXECUTE_IF("simulate_register_view_failure",
{
my_error(ER_OUT_OF_RESOURCES, MYF(0));
error= -1;
goto err;
});
if ((view->updatable_view= (can_be_merged &&
view->algorithm != VIEW_ALGORITHM_TMPTABLE)))
{
/* TODO: change here when we will support UNIONs */
for (TABLE_LIST *tbl= lex->select_lex.table_list.first;
tbl;
tbl= tbl->next_local)
{
if ((tbl->view && !tbl->updatable_view) || tbl->schema_table)
{
view->updatable_view= 0;
break;
}
for (TABLE_LIST *up= tbl; up; up= up->embedding)
{
if (up->outer_join)
{
view->updatable_view= 0;
goto loop_out;