diff options
Diffstat (limited to 'sql/item.h')
| -rw-r--r-- | sql/item.h | 24 |
1 files changed, 19 insertions, 5 deletions
diff --git a/sql/item.h b/sql/item.h index 11b9460906e..18b419dd6d5 100644 --- a/sql/item.h +++ b/sql/item.h @@ -232,6 +232,8 @@ public: static void *operator new(size_t size) {return (void*) sql_alloc((uint) size); } static void *operator new(size_t size, MEM_ROOT *mem_root) { return (void*) alloc_root(mem_root, (uint) size); } + /* Special for SP local variable assignment - reusing slots */ + static void *operator new(size_t size, Item *reuse, uint *rsize); static void operator delete(void *ptr,size_t size) { TRASH(ptr, size); } static void operator delete(void *ptr, MEM_ROOT *mem_root) {} @@ -247,6 +249,9 @@ public: enum traverse_order { POSTFIX, PREFIX }; + /* Reuse size, only used by SP local variable assignment, otherwize 0 */ + uint rsize; + /* str_values's main purpose is to be used to cache the value in save_in_field @@ -1614,13 +1619,18 @@ enum trg_event_type TRG_EVENT_INSERT= 0 , TRG_EVENT_UPDATE= 1, TRG_EVENT_DELETE= 2 }; +class Table_triggers_list; + /* Represents NEW/OLD version of field of row which is changed/read in trigger. - Note: For this item actual binding to Field object happens not during - fix_fields() (like for Item_field) but during parsing of trigger - definition, when table is opened, with special setup_field() call. + Note: For this item main part of actual binding to Field object happens + not during fix_fields() call (like for Item_field) but right after + parsing of trigger definition, when table is opened, with special + setup_field() call. On fix_fields() stage we simply choose one of + two Field instances representing either OLD or NEW version of this + field. */ class Item_trigger_field : public Item_field { @@ -1630,13 +1640,17 @@ public: row_version_type row_version; /* Next in list of all Item_trigger_field's in trigger */ Item_trigger_field *next_trg_field; + /* Index of the field in the TABLE::field array */ + uint field_idx; + /* Pointer to Table_trigger_list object for table of this trigger */ + Table_triggers_list *triggers; Item_trigger_field(row_version_type row_ver_par, const char *field_name_par): Item_field((const char *)NULL, (const char *)NULL, field_name_par), - row_version(row_ver_par) + row_version(row_ver_par), field_idx((uint)-1) {} - void setup_field(THD *thd, TABLE *table, enum trg_event_type event); + void setup_field(THD *thd, TABLE *table); enum Type type() const { return TRIGGER_FIELD_ITEM; } bool eq(const Item *item, bool binary_cmp) const; bool fix_fields(THD *, struct st_table_list *, Item **); |