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BUG#20953: create proc with a create view that uses local vars/params

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should fail to create

The problem was that this type of errors was checked during view
creation, which doesn't happen when CREATE VIEW is a statement of
a created stored routine.

The solution is to perform the checks at parse time.  The idea of the
fix is that the parser checks if a construction just parsed is allowed
in current circumstances by testing certain flags, and this flags are
reset for VIEWs.

The side effect of this change is that if the user already have
such bogus routines, it will now get a error when trying to do

  SHOW CREATE PROCEDURE proc;

(and some other) and when trying to execute such routine he will get

  ERROR 1457 (HY000): Failed to load routine test.p5. The table mysql.proc is missing, corrupt, or contains bad data (internal code -6)

However there should be very few such users (if any), and they may
(and should) drop these bogus routines.


mysql-test/r/sp-error.result:
  Add result for bug#20953: create proc with a create view that uses
  local vars/params should fail to create.
mysql-test/r/view.result:
  Update results.
mysql-test/t/sp-error.test:
  Add test case for bug#20953: create proc with a create view that uses
  local vars/params should fail to create.
mysql-test/t/view.test:
  Add second test for variable in a view.
  Remove SP variable in a view test, as it tests wrong behaviour.
  Add test for derived table in a view.
sql/sql_lex.cc:
  Remove LEX::variables_used.
sql/sql_lex.h:
  Remove LEX::variables_used and add st_parsing_options structure and
  LEX::parsing_options member.
sql/sql_view.cc:
  Move some error checking to sql/sql_yacc.yy.
sql/sql_yacc.yy:
  Check for disallowed syntax in a CREATE VIEW at parse time to rise a
  error when it is used inside CREATE PROCEDURE and CREATE FUNCTION, as
  well as by itself.
This commit is contained in:
unknown 2006-10-12 18:02:57 +04:00
commit 6d1fdc7308
8 changed files with 204 additions and 75 deletions
Download patch file Download diff file Expand all files Collapse all files

139
sql/sql_yacc.yy
View file

@ -721,7 +721,7 @@ bool my_yyoverflow(short **a, YYSTYPE **b, ulong *yystacksize);
%type <item>
literal text_literal insert_ident order_ident
simple_ident select_item2 expr opt_expr opt_else sum_expr in_sum_expr
bool_term bool_factor bool_test bool_pri
variable variable_aux bool_term bool_factor bool_test bool_pri
predicate bit_expr bit_term bit_factor value_expr term factor
table_wild simple_expr udf_expr
expr_or_default set_expr_or_default interval_expr
@ -4281,32 +4281,7 @@ simple_expr:
}
| literal
| param_marker
| '@' ident_or_text SET_VAR expr
{
$$= new Item_func_set_user_var($2,$4);
LEX *lex= Lex;
lex->uncacheable(UNCACHEABLE_RAND);
lex->variables_used= 1;
}
| '@' ident_or_text
{
$$= new Item_func_get_user_var($2);
LEX *lex= Lex;
lex->uncacheable(UNCACHEABLE_RAND);
lex->variables_used= 1;
}
| '@' '@' opt_var_ident_type ident_or_text opt_component
{
if ($4.str && $5.str && check_reserved_words(&$4))
{
yyerror(ER(ER_SYNTAX_ERROR));
YYABORT;
}
if (!($$= get_system_var(YYTHD, $3, $4, $5)))
YYABORT;
Lex->variables_used= 1;
}
| variable
| sum_expr
| simple_expr OR_OR_SYM simple_expr
{ $$= new Item_func_concat($1, $3); }
@ -5006,6 +4981,46 @@ sum_expr:
$5->empty();
};
variable:
'@'
{
if (! Lex->parsing_options.allows_variable)
{
my_error(ER_VIEW_SELECT_VARIABLE, MYF(0));
YYABORT;
}
}
variable_aux
{
$$= $3;
}
;
variable_aux:
ident_or_text SET_VAR expr
{
$$= new Item_func_set_user_var($1, $3);
LEX *lex= Lex;
lex->uncacheable(UNCACHEABLE_RAND);
}
| ident_or_text
{
$$= new Item_func_get_user_var($1);
LEX *lex= Lex;
lex->uncacheable(UNCACHEABLE_RAND);
}
| '@' opt_var_ident_type ident_or_text opt_component
{
if ($3.str && $4.str && check_reserved_words(&$3))
{
yyerror(ER(ER_SYNTAX_ERROR));
YYABORT;
}
if (!($$= get_system_var(YYTHD, $2, $3, $4)))
YYABORT;
}
;
opt_distinct:
/* empty */ { $$ = 0; }
|DISTINCT { $$ = 1; };
@ -5428,6 +5443,13 @@ select_derived_init:
SELECT_SYM
{
LEX *lex= Lex;
if (! lex->parsing_options.allows_derived)
{
my_error(ER_VIEW_SELECT_DERIVED, MYF(0));
YYABORT;
}
SELECT_LEX *sel= lex->current_select;
TABLE_LIST *embedding;
if (!sel->embedding || sel->end_nested_join(lex->thd))
@ -5787,6 +5809,13 @@ procedure_clause:
| PROCEDURE ident /* Procedure name */
{
LEX *lex=Lex;
if (! lex->parsing_options.allows_select_procedure)
{
my_error(ER_VIEW_SELECT_CLAUSE, MYF(0), "PROCEDURE");
YYABORT;
}
if (&lex->select_lex != lex->current_select)
{
my_error(ER_WRONG_USAGE, MYF(0), "PROCEDURE", "subquery");
@ -5886,28 +5915,40 @@ select_var_ident:
;
into:
INTO OUTFILE TEXT_STRING_filesystem
INTO
{
if (! Lex->parsing_options.allows_select_into)
{
my_error(ER_VIEW_SELECT_CLAUSE, MYF(0), "INTO");
YYABORT;
}
}
into_destination
;
into_destination:
OUTFILE TEXT_STRING_filesystem
{
LEX *lex= Lex;
lex->uncacheable(UNCACHEABLE_SIDEEFFECT);
if (!(lex->exchange= new sql_exchange($3.str, 0)) ||
if (!(lex->exchange= new sql_exchange($2.str, 0)) ||
!(lex->result= new select_export(lex->exchange)))
YYABORT;
}
opt_field_term opt_line_term
| INTO DUMPFILE TEXT_STRING_filesystem
| DUMPFILE TEXT_STRING_filesystem
{
LEX *lex=Lex;
if (!lex->describe)
{
lex->uncacheable(UNCACHEABLE_SIDEEFFECT);
if (!(lex->exchange= new sql_exchange($3.str,1)))
if (!(lex->exchange= new sql_exchange($2.str,1)))
YYABORT;
if (!(lex->result= new select_dump(lex->exchange)))
YYABORT;
}
}
| INTO select_var_list_init
| select_var_list_init
{
Lex->uncacheable(UNCACHEABLE_SIDEEFFECT);
}
@ -7067,8 +7108,13 @@ param_marker:
{
THD *thd=YYTHD;
LEX *lex= thd->lex;
Item_param *item= new Item_param((uint) (lex->tok_start -
(uchar *) thd->query));
Item_param *item;
if (! lex->parsing_options.allows_variable)
{
my_error(ER_VIEW_SELECT_VARIABLE, MYF(0));
YYABORT;
}
item= new Item_param((uint) (lex->tok_start - (uchar *) thd->query));
if (!($$= item) || lex->param_list.push_back(item))
{
my_message(ER_OUT_OF_RESOURCES, ER(ER_OUT_OF_RESOURCES), MYF(0));
@ -7188,6 +7234,12 @@ simple_ident:
if (spc && (spv = spc->find_variable(&$1)))
{
/* We're compiling a stored procedure and found a variable */
if (! lex->parsing_options.allows_variable)
{
my_error(ER_VIEW_SELECT_VARIABLE, MYF(0));
YYABORT;
}
Item_splocal *splocal;
splocal= new Item_splocal($1, spv->offset, spv->type,
lex->tok_start_prev -
@ -7197,7 +7249,6 @@ simple_ident:
splocal->m_sp= lex->sphead;
#endif
$$ = (Item*) splocal;
lex->variables_used= 1;
lex->safe_to_cache_query=0;
}
else
@ -9038,6 +9089,24 @@ view_list:
;
view_select:
{
LEX *lex= Lex;
lex->parsing_options.allows_variable= FALSE;
lex->parsing_options.allows_select_into= FALSE;
lex->parsing_options.allows_select_procedure= FALSE;
lex->parsing_options.allows_derived= FALSE;
}
view_select_aux
{
LEX *lex= Lex;
lex->parsing_options.allows_variable= TRUE;
lex->parsing_options.allows_select_into= TRUE;
lex->parsing_options.allows_select_procedure= TRUE;
lex->parsing_options.allows_derived= TRUE;
}
;
view_select_aux:
SELECT_SYM remember_name select_init2
{
THD *thd=YYTHD;