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MySQL 5.1: Item_func_get_user_var Class Reference

Item_func_get_user_var Class Reference

#include <item_func.h>

Inheritance diagram for Item_func_get_user_var:

[legend]Collaboration diagram for Item_func_get_user_var:

[legend]List of all members.


Public Member Functions
	Item_func_get_user_var (LEX_STRING a)
enum Functype	functype () const
LEX_STRING	get_name ()
double	val_real ()
longlong	val_int ()
my_decimal *	val_decimal (my_decimal *)
String *	val_str (String *str)
void	fix_length_and_dec ()
void	print (String *str)
enum Item_result	result_type () const
enum_field_types	field_type () const
const char *	func_name () const
bool	const_item () const
table_map	used_tables () const
bool	eq (const Item *item, bool binary_cmp) const
Settable_routine_parameter *	get_settable_routine_parameter ()
Public Attributes
LEX_STRING	name
Private Member Functions
bool	set_value (THD thd, sp_rcontext ctx, Item **it)
Private Attributes
user_var_entry *	var_entry

Detailed Description

Definition at line 1216 of file item_func.h.

Constructor & Destructor Documentation

Item_func_get_user_var::Item_func_get_user_var ( LEX_STRING a ) [inline]

Definition at line 1223 of file item_func.h.

01223                                       :
01224     Item_func(), name(a) {}
  enum Functype functype() const { return GUSERVAR_FUNC; }

Member Function Documentation

bool Item_func_get_user_var::const_item ( ) const [virtual]

Reimplemented from Item_func.

Definition at line 4120 of file item_func.cc.

References current_thd, and var_entry.

Referenced by used_tables().

04121 {
04122   return (!var_entry || current_thd->query_id != var_entry->update_query_id);
04123 }

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

Reimplemented from Item_func.

Definition at line 4145 of file item_func.cc.

References Item::FUNC_ITEM, functype(), LEX_STRING::length, memcmp(), name, LEX_STRING::str, and Item::type().

04146 {
04147   /* Assume we don't have rtti */
04148   if (this == item)
04149     return 1;                                   // Same item is same.
04150   /* Check if other type is also a get_user_var() object */
04151   if (item->type() != FUNC_ITEM ||
04152       ((Item_func*) item)->functype() != functype())
04153     return 0;
04154   Item_func_get_user_var *other=(Item_func_get_user_var*) item;
04155   return (name.length == other->name.length &&
04156           !memcmp(name.str, other->name.str, name.length));
04157 }

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enum_field_types Item_func_get_user_var::field_type ( ) const [inline, virtual]

Reimplemented from Item.

Definition at line 1238 of file item_func.h.

References MYSQL_TYPE_VARCHAR.

01238 { return MYSQL_TYPE_VARCHAR; }

void Item_func_get_user_var::fix_length_and_dec ( ) [virtual]

Implements Item_result_field.

Definition at line 4073 of file item_func.cc.

References Item::collation, current_thd, DBUG_ASSERT, DECIMAL_MAX_SCALE, DECIMAL_MAX_STR_LENGTH, DECIMAL_RESULT, DERIVATION_IMPLICIT, get_var_with_binlog(), INT_RESULT, MAX_BIGINT_WIDTH, MAX_BLOB_WIDTH, Item::max_length, Item::maybe_null, name, NOT_FIXED_DEC, REAL_RESULT, ROW_RESULT, DTCollation::set(), STRING_RESULT, and var_entry.

04074 {
04075   THD *thd=current_thd;
04076   int error;
04077   maybe_null=1;
04078   decimals=NOT_FIXED_DEC;
04079   max_length=MAX_BLOB_WIDTH;
04080 
04081   error= get_var_with_binlog(thd, thd->lex->sql_command, name, &var_entry);
04082 
04083   if (var_entry)
04084   {
04085     collation.set(var_entry->collation);
04086     switch (var_entry->type) {
04087     case REAL_RESULT:
04088       max_length= DBL_DIG + 8;
04089       break;
04090     case INT_RESULT:
04091       max_length= MAX_BIGINT_WIDTH;
04092       decimals=0;
04093       break;
04094     case STRING_RESULT:
04095       max_length= MAX_BLOB_WIDTH;
04096       break;
04097     case DECIMAL_RESULT:
04098       max_length= DECIMAL_MAX_STR_LENGTH;
04099       decimals= DECIMAL_MAX_SCALE;
04100       break;
04101     case ROW_RESULT:                            // Keep compiler happy
04102     default:
04103       DBUG_ASSERT(0);
04104       break;
04105     }
04106   }
04107   else
04108   {
04109     collation.set(&my_charset_bin, DERIVATION_IMPLICIT);
04110     null_value= 1;
04111   }
04112 
04113   if (error)
04114     thd->fatal_error();
04115 
04116   return;
04117 }

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const char* Item_func_get_user_var::func_name ( ) const [inline, virtual]

Implements Item_func.

Definition at line 1239 of file item_func.h.

01239 { return "get_user_var"; }

enum Functype Item_func_get_user_var::functype ( ) const [inline, virtual]

Reimplemented from Item_func.

Definition at line 1225 of file item_func.h.

References Item_func::GUSERVAR_FUNC.

Referenced by eq().

01225 { return GUSERVAR_FUNC; }

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LEX_STRING Item_func_get_user_var::get_name ( ) [inline]

Definition at line 1226 of file item_func.h.

References name.

Referenced by set_value().

01226 { return name; }

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

Reimplemented from Item.

Definition at line 1249 of file item_func.h.

01250   {
01251     return this;
01252   }

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

Reimplemented from Item_func.

Definition at line 4137 of file item_func.cc.

References String::append(), LEX_STRING::length, name, LEX_STRING::str, and STRING_WITH_LEN.

04138 {
04139   str->append(STRING_WITH_LEN("(@"));
04140   str->append(name.str,name.length);
04141   str->append(')');
04142 }

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enum Item_result Item_func_get_user_var::result_type ( ) const [virtual]

Reimplemented from Item.

Definition at line 4126 of file item_func.cc.

References current_thd, hash_search(), LEX_STRING::length, name, LEX_STRING::str, and STRING_RESULT.

04127 {
04128   user_var_entry *entry;
04129   if (!(entry = (user_var_entry*) hash_search(&current_thd->user_vars,
04130                                               (byte*) name.str,
04131                                               name.length)))
04132     return STRING_RESULT;
04133   return entry->type;
04134 }

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

Implements Settable_routine_parameter.

Definition at line 4160 of file item_func.cc.

References Item_func_set_user_var::check(), Item_func_set_user_var::fix_fields(), get_name(), and Item_func_set_user_var::update().

04162 {
04163   Item_func_set_user_var *suv= new Item_func_set_user_var(get_name(), *it);
04164   /*
04165     Item_func_set_user_var is not fixed after construction, call
04166     fix_fields().
04167   */
04168   return (!suv || suv->fix_fields(thd, it) || suv->check() || suv->update());
04169 }

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table_map Item_func_get_user_var::used_tables ( ) const [inline, virtual]

Reimplemented from Item_func.

Definition at line 1241 of file item_func.h.

References const_item(), and RAND_TABLE_BIT.

01242   { return const_item() ? 0 : RAND_TABLE_BIT; }

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my_decimal * Item_func_get_user_var::val_decimal ( my_decimal * ) [virtual]

Reimplemented from Item_func.

Definition at line 3924 of file item_func.cc.

References DBUG_ASSERT, Item::fixed, and var_entry.

03925 {
03926   DBUG_ASSERT(fixed == 1);
03927   if (!var_entry)
03928     return 0;
03929   return var_entry->val_decimal(&null_value, dec);
03930 }

longlong Item_func_get_user_var::val_int ( ) [virtual]

Implements Item.

Definition at line 3933 of file item_func.cc.

References DBUG_ASSERT, Item::fixed, LL, and var_entry.

03934 {
03935   DBUG_ASSERT(fixed == 1);
03936   if (!var_entry)
03937     return LL(0);                               // No such variable
03938   return (var_entry->val_int(&null_value));
03939 }

double Item_func_get_user_var::val_real ( ) [virtual]

Implements Item.

Definition at line 3915 of file item_func.cc.

References DBUG_ASSERT, Item::fixed, and var_entry.

03916 {
03917   DBUG_ASSERT(fixed == 1);
03918   if (!var_entry)
03919     return 0.0;                                 // No such variable
03920   return (var_entry->val_real(&null_value));
03921 }

String * Item_func_get_user_var::val_str ( String * str ) [virtual]

Implements Item.

Definition at line 3905 of file item_func.cc.

References DBUG_ASSERT, DBUG_ENTER, DBUG_RETURN, Item::fixed, and var_entry.

03906 {
03907   DBUG_ASSERT(fixed == 1);
03908   DBUG_ENTER("Item_func_get_user_var::val_str");
03909   if (!var_entry)
03910     DBUG_RETURN((String*) 0);                   // No such variable
03911   DBUG_RETURN(var_entry->val_str(&null_value, str, decimals));
03912 }