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MySQL 5.1: Item_default_value Class Reference

Item_default_value Class Reference

#include <item.h>

Inheritance diagram for Item_default_value:

[legend]Collaboration diagram for Item_default_value:

[legend]List of all members.


Public Member Functions
	Item_default_value (Name_resolution_context *context_arg)
	Item_default_value (Name_resolution_context context_arg, Item a)
enum Type	type () const
bool	eq (const Item *item, bool binary_cmp) const
bool	fix_fields (THD , Item *)
void	print (String *str)
int	save_in_field (Field *field_arg, bool no_conversions)
table_map	used_tables () const
bool	walk (Item_processor processor, bool walk_subquery, byte *args)
Item *	transform (Item_transformer transformer, byte *args)
Public Attributes
Item *	arg

Detailed Description

Definition at line 2175 of file item.h.

Constructor & Destructor Documentation

Item_default_value::Item_default_value ( Name_resolution_context * context_arg ) [inline]

Definition at line 2179 of file item.h.

02180     :Item_field(context_arg, (const char *)NULL, (const char *)NULL,
02181                (const char *)NULL),
02182      arg(NULL) {}

Item_default_value::Item_default_value	(	Name_resolution_context *	context_arg,
		Item *	a
	)			`[inline]`

Definition at line 2183 of file item.h.

02184     :Item_field(context_arg, (const char *)NULL, (const char *)NULL,
02185                 (const char *)NULL),
02186      arg(a) {}

Member Function Documentation

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

Reimplemented from Item_field.

Definition at line 5282 of file item.cc.

References arg, Item::DEFAULT_VALUE_ITEM, and Item::type().

05283 {
05284   return item->type() == DEFAULT_VALUE_ITEM && 
05285     ((Item_default_value *)item)->arg->eq(arg, binary_cmp);
05286 }

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

Reimplemented from Item_field.

Definition at line 5289 of file item.cc.

References arg, Item_ident::context, DBUG_ASSERT, ER_NO_DEFAULT_FOR_FIELD, error, FALSE, Item_field::field, Item::FIELD_ITEM, Field::field_name, Item::fix_fields(), Item::fixed, Field::flags, memcpy, my_error(), MYF, Item::name, NO_DEFAULT_VALUE_FLAG, Name_resolution_context::process_error(), Item::real_item(), Item_field::set_field(), Field::size_of(), sql_alloc(), TRUE, and Item::type().

05290 {
05291   Item *real_arg;
05292   Item_field *field_arg;
05293   Field *def_field;
05294   DBUG_ASSERT(fixed == 0);
05295 
05296   if (!arg)
05297   {
05298     fixed= 1;
05299     return FALSE;
05300   }
05301   if (!arg->fixed && arg->fix_fields(thd, &arg))
05302     goto error;
05303 
05304 
05305   real_arg= arg->real_item();
05306   if (real_arg->type() != FIELD_ITEM)
05307   {
05308     my_error(ER_NO_DEFAULT_FOR_FIELD, MYF(0), arg->name);
05309     goto error;
05310   }
05311 
05312   field_arg= (Item_field *)real_arg;
05313   if (field_arg->field->flags & NO_DEFAULT_VALUE_FLAG)
05314   {
05315     my_error(ER_NO_DEFAULT_FOR_FIELD, MYF(0), field_arg->field->field_name);
05316     goto error;
05317   }
05318   if (!(def_field= (Field*) sql_alloc(field_arg->field->size_of())))
05319     goto error;
05320   memcpy(def_field, field_arg->field, field_arg->field->size_of());
05321   def_field->move_field_offset((my_ptrdiff_t)
05322                                (def_field->table->s->default_values -
05323                                 def_field->table->record[0]));
05324   set_field(def_field);
05325   return FALSE;
05326 
05327 error:
05328   context->process_error(thd);
05329   return TRUE;
05330 }

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

Reimplemented from Item_ident.

Definition at line 5333 of file item.cc.

References String::append(), arg, Item::print(), and STRING_WITH_LEN.

05334 {
05335   if (!arg)
05336   {
05337     str->append(STRING_WITH_LEN("default"));
05338     return;
05339   }
05340   str->append(STRING_WITH_LEN("default("));
05341   arg->print(str);
05342   str->append(')');
05343 }

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int Item_default_value::save_in_field	(	Field *	field_arg,
		bool	no_conversions
	)			`[virtual]`

Reimplemented from Item_field.

Definition at line 5346 of file item.cc.

References arg, Item_ident::cached_table, Item_ident::context, ER, ER_NO_DEFAULT_FOR_FIELD, ER_NO_DEFAULT_FOR_VIEW_FIELD, Name_resolution_context::error_processor, Field::field_name, Field::flags, st_table::in_use, NO_DEFAULT_VALUE_FLAG, push_warning_printf(), Item_field::save_in_field(), Field::set_default(), LEX_STRING::str, Field::table, st_table_list::top_table(), st_table_list::view_db, view_error_processor(), st_table_list::view_name, and MYSQL_ERROR::WARN_LEVEL_WARN.

05347 {
05348   if (!arg)
05349   {
05350     if (field_arg->flags & NO_DEFAULT_VALUE_FLAG)
05351     {
05352       if (context->error_processor == &view_error_processor)
05353       {
05354         TABLE_LIST *view= cached_table->top_table();
05355         push_warning_printf(field_arg->table->in_use,
05356                             MYSQL_ERROR::WARN_LEVEL_WARN,
05357                             ER_NO_DEFAULT_FOR_VIEW_FIELD,
05358                             ER(ER_NO_DEFAULT_FOR_VIEW_FIELD),
05359                             view->view_db.str,
05360                             view->view_name.str);
05361       }
05362       else
05363       {
05364         push_warning_printf(field_arg->table->in_use,
05365                             MYSQL_ERROR::WARN_LEVEL_WARN,
05366                             ER_NO_DEFAULT_FOR_FIELD,
05367                             ER(ER_NO_DEFAULT_FOR_FIELD),
05368                             field_arg->field_name);
05369       }
05370       return 1;
05371     }
05372     field_arg->set_default();
05373     return 0;
05374   }
05375   return Item_field::save_in_field(field_arg, no_conversions);
05376 }

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Item* Item_default_value::transform	(	Item_transformer	transformer,
		byte *	args
	)			`[inline, virtual]`

Reimplemented from Item.

Definition at line 2204 of file item.h.

References arg, Item::new_item(), and Item::transform().

02205   {
02206     Item *new_item= arg->transform(transformer, args);
02207     if (!new_item)
02208       return 0;
02209     arg= new_item;
02210     return (this->*transformer)(args);
02211   }

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enum Type Item_default_value::type ( ) const [inline, virtual]

Reimplemented from Item_field.

Definition at line 2187 of file item.h.

References Item::DEFAULT_VALUE_ITEM.

02187 { return DEFAULT_VALUE_ITEM; }

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

Reimplemented from Item_field.

Definition at line 2192 of file item.h.

02192 { return (table_map)0L; }

bool Item_default_value::walk	(	Item_processor	processor,
		bool	walk_subquery,
		byte *	args
	)			`[inline, virtual]`

Reimplemented from Item.

Definition at line 2194 of file item.h.

References arg, and Item::walk().

02195   {
02196     return arg->walk(processor, walk_subquery, args) ||
02197       (this->*processor)(args);
02198   }

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Member Data Documentation

Item* Item_default_value::arg

Definition at line 2178 of file item.h.

Referenced by eq(), fix_fields(), print(), save_in_field(), transform(), and walk().

The documentation for this class was generated from the following files:

mysql/src/5.1-dbg/sql/item.h
mysql/src/5.1-dbg/sql/item.cc

Generated on Sat Sep 9 21:22:30 2006 for MySQL 5.1 by

1.4.7

The world's most popular open source database

Item_default_value Class Reference

Public Member Functions

Public Attributes

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation