diff options
Diffstat (limited to 'sql/set_var.h')
| -rw-r--r-- | sql/set_var.h | 29 |
1 files changed, 28 insertions, 1 deletions
diff --git a/sql/set_var.h b/sql/set_var.h index c43cdbfd63e..31154d1e1d7 100644 --- a/sql/set_var.h +++ b/sql/set_var.h @@ -39,6 +39,7 @@ typedef bool (*sys_check_func)(THD *, set_var *); typedef bool (*sys_update_func)(THD *, set_var *); typedef void (*sys_after_update_func)(THD *,enum_var_type); typedef void (*sys_set_default_func)(THD *, enum_var_type); +typedef byte *(*sys_value_ptr_func)(THD *thd); class sys_var { @@ -350,6 +351,31 @@ public: }; +/* Variable that you can only read from */ + +class sys_var_readonly: public sys_var +{ +public: + enum_var_type var_type; + SHOW_TYPE show_type; + sys_value_ptr_func value_ptr_func; + sys_var_readonly(const char *name_arg, enum_var_type type, + SHOW_TYPE show_type_arg, + sys_value_ptr_func value_ptr_func_arg) + :sys_var(name_arg), var_type(type), + show_type(show_type_arg), value_ptr_func(value_ptr_func_arg) + {} + bool update(THD *thd, set_var *var) { return 1; } + bool check_default(enum_var_type type) { return 1; } + bool check_type(enum_var_type type) { return type != var_type; } + bool check_update_type(Item_result type) { return 1; } + byte *value_ptr(THD *thd, enum_var_type type) + { + return (*value_ptr_func)(thd); + } + SHOW_TYPE type() { return show_type; } +}; + /**************************************************************************** Classes for parsing of the SET command ****************************************************************************/ @@ -388,7 +414,8 @@ public: if (value_arg && value_arg->type() == Item::FIELD_ITEM) { Item_field *item= (Item_field*) value_arg; - if (!(value=new Item_string(item->field_name, strlen(item->field_name)))) + if (!(value=new Item_string(item->field_name, strlen(item->field_name), + system_charset_info))) value=value_arg; /* Give error message later */ } else |