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MySQL 5.1: Item_trigger_field Class Reference

Item_trigger_field Class Reference

#include <item.h>

Inheritance diagram for Item_trigger_field:

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[legend]List of all members.


Public Types
	OLD_ROW
	NEW_ROW
enum	row_version_type { OLD_ROW, NEW_ROW }
Public Member Functions
	Item_trigger_field (Name_resolution_context context_arg, row_version_type row_ver_arg, const char field_name_arg, ulong priv, const bool ro)
void	setup_field (THD thd, TABLE table, GRANT_INFO *table_grant_info)
enum Type	type () const
bool	eq (const Item *item, bool binary_cmp) const
bool	fix_fields (THD , Item *)
void	print (String *str)
table_map	used_tables () const
void	cleanup ()
Settable_routine_parameter *	get_settable_routine_parameter ()
bool	set_value (THD thd, Item *it)
Public Attributes
row_version_type	row_version
Item_trigger_field *	next_trg_field
uint	field_idx
Table_triggers_list *	triggers
Private Member Functions
void	set_required_privilege (bool rw)
bool	set_value (THD thd, sp_rcontext ctx, Item **it)
Private Attributes
ulong	original_privilege
ulong	want_privilege
GRANT_INFO *	table_grants
bool	read_only

Detailed Description

Definition at line 2282 of file item.h.

Member Enumeration Documentation

enum Item_trigger_field::row_version_type

Enumerator:

OLD_ROW
NEW_ROW

Definition at line 2287 of file item.h.

02287 {OLD_ROW, NEW_ROW};

Constructor & Destructor Documentation

Item_trigger_field::Item_trigger_field	(	Name_resolution_context *	context_arg,
		row_version_type	row_ver_arg,
		const char *	field_name_arg,
		ulong	priv,
		const bool	ro
	)			`[inline]`

Definition at line 2296 of file item.h.

02300     :Item_field(context_arg,
02301                (const char *)NULL, (const char *)NULL, field_name_arg),
02302      row_version(row_ver_arg), field_idx((uint)-1), original_privilege(priv),
02303      want_privilege(priv), table_grants(NULL), read_only (ro)
02304   {}

Member Function Documentation

void Item_trigger_field::cleanup ( ) [virtual]

Reimplemented from Item_field.

Definition at line 5579 of file item.cc.

References Item::cleanup(), original_privilege, and want_privilege.

05580 {
05581   want_privilege= original_privilege;
05582   /*
05583     Since special nature of Item_trigger_field we should not do most of
05584     things from Item_field::cleanup() or Item_ident::cleanup() here.
05585   */
05586   Item::cleanup();
05587 }

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bool Item_trigger_field::eq	(	const Item *	item,
		bool	binary_cmp
	)			const `[virtual]`

Reimplemented from Item_field.

Definition at line 5499 of file item.cc.

References Item_ident::field_name, my_strcasecmp, row_version, system_charset_info, Item::TRIGGER_FIELD_ITEM, and Item::type().

05500 {
05501   return item->type() == TRIGGER_FIELD_ITEM &&
05502          row_version == ((Item_trigger_field *)item)->row_version &&
05503          !my_strcasecmp(system_charset_info, field_name,
05504                         ((Item_trigger_field *)item)->field_name);
05505 }

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bool Item_trigger_field::fix_fields	(	THD *	,
		Item **
	)			`[virtual]`

Reimplemented from Item_field.

Definition at line 5527 of file item.cc.

References check_grant_column(), st_table_share::db, DBUG_ASSERT, ER_BAD_FIELD_ERROR, FALSE, Item_field::field, field_idx, Item_ident::field_name, Item::fixed, my_error(), MYF, Table_triggers_list::new_field, NEW_ROW, Table_triggers_list::old_field, OLD_ROW, row_version, st_table::s, Item_field::set_field(), LEX_STRING::str, strlen(), Table_triggers_list::table, table_grants, st_table_share::table_name, triggers, TRUE, want_privilege, and st_grant_info::want_privilege.

Referenced by Table_triggers_list::create_trigger(), and set_value().

05528 {
05529   /*
05530     Since trigger is object tightly associated with TABLE object most
05531     of its set up can be performed during trigger loading i.e. trigger
05532     parsing! So we have little to do in fix_fields. :)
05533   */
05534 
05535   DBUG_ASSERT(fixed == 0);
05536 
05537   /* Set field. */
05538 
05539   if (field_idx != (uint)-1)
05540   {
05541 #ifndef NO_EMBEDDED_ACCESS_CHECKS
05542     /*
05543       Check access privileges for the subject table. We check privileges only
05544       in runtime.
05545     */
05546 
05547     if (table_grants)
05548     {
05549       table_grants->want_privilege= want_privilege;
05550 
05551       if (check_grant_column(thd, table_grants, triggers->table->s->db.str,
05552                              triggers->table->s->table_name.str, field_name,
05553                              strlen(field_name), thd->security_ctx))
05554         return TRUE;
05555     }
05556 #endif // NO_EMBEDDED_ACCESS_CHECKS
05557 
05558     field= (row_version == OLD_ROW) ? triggers->old_field[field_idx] :
05559                                       triggers->new_field[field_idx];
05560     set_field(field);
05561     fixed= 1;
05562     return FALSE;
05563   }
05564 
05565   my_error(ER_BAD_FIELD_ERROR, MYF(0), field_name,
05566            (row_version == NEW_ROW) ? "NEW" : "OLD");
05567   return TRUE;
05568 }

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Settable_routine_parameter* Item_trigger_field::get_settable_routine_parameter ( ) [inline, virtual]

Reimplemented from Item.

Definition at line 2318 of file item.h.

References read_only.

Referenced by Table_triggers_list::mark_fields_used().

02319   {
02320     return (read_only ? 0 : this);
02321   }

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void Item_trigger_field::print ( String * str ) [virtual]

Reimplemented from Item_ident.

Definition at line 5571 of file item.cc.

References String::append(), Item_ident::field_name, NEW_ROW, and row_version.

Referenced by sp_instr_set_trigger_field::print().

05572 {
05573   str->append((row_version == NEW_ROW) ? "NEW" : "OLD", 3);
05574   str->append('.');
05575   str->append(field_name);
05576 }

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void Item_trigger_field::set_required_privilege ( bool rw ) [private, virtual]

Reimplemented from Settable_routine_parameter.

Definition at line 5508 of file item.cc.

References SELECT_ACL, UPDATE_ACL, and want_privilege.

05509 {
05510   /*
05511     Require SELECT and UPDATE privilege if this field will be read and
05512     set, and only UPDATE privilege for setting the field.
05513   */
05514   want_privilege= (rw ? SELECT_ACL | UPDATE_ACL : UPDATE_ACL);
05515 }

bool Item_trigger_field::set_value	(	THD *	thd,
		Item **	it
	)			`[inline]`

Definition at line 2323 of file item.h.

References NULL, and set_value().

02324   {
02325     return set_value(thd, NULL, it);
02326   }

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bool Item_trigger_field::set_value	(	THD *	thd,
		sp_rcontext *	ctx,
		Item **	it
	)			`[private, virtual]`

Implements Settable_routine_parameter.

Definition at line 5518 of file item.cc.

References Item_field::field, fix_fields(), Item::fixed, Item::save_in_field(), and sp_prepare_func_item().

Referenced by sp_instr_set_trigger_field::exec_core(), and set_value().

05519 {
05520   Item *item= sp_prepare_func_item(thd, it);
05521 
05522   return (!item || (!fixed && fix_fields(thd, 0)) ||
05523           (item->save_in_field(field, 0) < 0));
05524 }

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void Item_trigger_field::setup_field	(	THD *	thd,
		TABLE *	table,
		GRANT_INFO *	table_grant_info
	)

Definition at line 5475 of file item.cc.

References field_idx, Item_ident::field_name, find_field_in_table(), MARK_COLUMNS_NONE, strlen(), table_grants, st_table::triggers, and triggers.

Referenced by Table_triggers_list::create_trigger().

05477 {
05478   /*
05479     It is too early to mark fields used here, because before execution
05480     of statement that will invoke trigger other statements may use same
05481     TABLE object, so all such mark-up will be wiped out.
05482     So instead we do it in Table_triggers_list::mark_fields_used()
05483     method which is called during execution of these statements.
05484   */
05485   enum_mark_columns save_mark_used_columns= thd->mark_used_columns;
05486   thd->mark_used_columns= MARK_COLUMNS_NONE;
05487   /*
05488     Try to find field by its name and if it will be found
05489     set field_idx properly.
05490   */
05491   (void)find_field_in_table(thd, table, field_name, (uint) strlen(field_name),
05492                             0, &field_idx);
05493   thd->mark_used_columns= save_mark_used_columns;
05494   triggers= table->triggers;
05495   table_grants= table_grant_info;
05496 }