Create_native_func Class Reference

Inheritance diagram for Create_native_func:

List of all members.

Public Member Functions
virtual Item *	create_func (THD *thd, LEX_STRING name, List< Item > *item_list)
virtual Item *	create_native (THD *thd, LEX_STRING name, List< Item > *item_list)=0
Protected Member Functions
	Create_native_func ()
virtual	~Create_native_func ()

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Detailed Description

Adapter for native functions with a variable number of arguments. The main use of this class is to discard the following calls: foo(expr1 AS name1, expr2 AS name2, ...) which are syntactically correct (the syntax can refer to a UDF), but semantically invalid for native functions.

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Constructor & Destructor Documentation

Create_native_func::Create_native_func

(

)

[inline, protected]

Constructor.

virtual Create_native_func::~Create_native_func

(

)

[inline, protected, virtual]

Destructor.

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Member Function Documentation

Item * Create_native_func::create_func	(	THD *	thd,
		LEX_STRING	name,
		List< Item > *	item_list
	)		[virtual]

The builder create method. Given the function name and list or arguments, this method creates an Item that represents the function call. In case or errors, a NULL item is returned, and an error is reported. Note that the thd object may be modified by the builder. In particular, the following members/methods can be set/called, depending on the function called and the function possible side effects.

• thd->lex->binlog_row_based_if_mixed
• thd->lex->current_context()
• thd->lex->safe_to_cache_query
• thd->lex->uncacheable(UNCACHEABLE_SIDEEFFECT)
• thd->lex->uncacheable(UNCACHEABLE_RAND)
• thd->lex->add_time_zone_tables_to_query_tables(thd)

Parameters:

thd	The current thread
name	The function name
item_list	The list of arguments to the function, can be NULL

Returns:

An item representing the parsed function call, or NULL

Implements Create_func.

virtual Item* Create_native_func::create_native	(	THD *	thd,
		LEX_STRING	name,
		List< Item > *	item_list
	)		[pure virtual]

Builder method, with no arguments.

Parameters:

thd	The current thread
name	The native function name
item_list	The function parameters, none of which are named

Returns:

An item representing the function call

Implemented in Create_func_year_week, Create_func_unix_timestamp, Create_func_round, Create_func_rand, Create_func_master_gtid_set_wait, Create_func_master_pos_wait, Create_func_make_set, Create_func_log, Create_func_locate, Create_func_least, Create_func_last_insert_id, Create_func_greatest, Create_func_from_unixtime, Create_func_field, Create_func_export_set, Create_func_encrypt, Create_func_elt, Create_func_des_encrypt, Create_func_des_decrypt, Create_func_concat_ws, Create_func_concat, Create_func_atan, and Create_func_aes_base.

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

• item_create.cc