sp_instr_set_trigger_field Class Reference

#include <sp_instr.h>

Inheritance diagram for sp_instr_set_trigger_field:

List of all members.

Public Member Functions
	sp_instr_set_trigger_field (uint ip, LEX *lex, LEX_STRING trigger_field_name, Item_trigger_field *trigger_field, Item *value_item, LEX_STRING value_query)
virtual void	print (String *str)
virtual bool	exec_core (THD *thd, uint *nextp)
virtual bool	is_invalid () const
virtual void	invalidate ()
virtual bool	on_after_expr_parsing (THD *thd)
virtual void	cleanup_before_parsing (THD *thd)
virtual LEX_STRING	get_expr_query () const

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Detailed Description

sp_instr_set_trigger_field represents SET-statements, which deal with NEW/OLD trigger pseudo-rows.

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Member Function Documentation

void sp_instr_set_trigger_field::cleanup_before_parsing

(

THD *

thd

)

[virtual]

Destroy items in the free list before re-parsing the statement query string (and thus, creating new items).

Parameters:

thd	Thread context.

Reimplemented from sp_lex_instr.

bool sp_instr_set_trigger_field::exec_core	(	THD *	thd,
		uint *	nextp
	)		[virtual]

Execute core function of instruction after all preparations (e.g. setting of proper LEX, saving part of the thread context).

Parameters:

thd	Thread context.
nextp[out]	next instruction pointer

Returns:

Error flag.

Implements sp_lex_instr.

virtual LEX_STRING sp_instr_set_trigger_field::get_expr_query

(

)

const [inline, virtual]

Returns:

the expression query string. This string can not be passed directly to the parser as it is most likely not a valid SQL-statement.

Note:

as it can be seen in the get_query() implementation, get_expr_query() might return EMPTY_STR. EMPTY_STR means that no query-expression is available. That happens when class provides different implementation of get_query(). Strictly speaking, this is a drawback of the current class hierarchy.

Reimplemented from sp_lex_instr.

virtual void sp_instr_set_trigger_field::invalidate

(

)

[inline, virtual]

Invalidate the object.

Implements sp_lex_instr.

virtual bool sp_instr_set_trigger_field::is_invalid

(

)

const [inline, virtual]

Return values:

false	if the object (i.e. LEX-object) is valid and exec_core() can be just called.
true	if the object is not valid any longer, exec_core() can not be called. The original query string should be re-parsed and a new LEX-object should be used.

Implements sp_lex_instr.

bool sp_instr_set_trigger_field::on_after_expr_parsing

(

THD *

thd

)

[virtual]

Callback function which is called after the statement query string is successfully parsed, and the thread context has not been switched to the outer context. The thread context contains new LEX-object corresponding to the parsed query string.

Parameters:

thd	Thread context.

Returns:

Error flag.

Reimplemented from sp_lex_instr.

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

• sp_instr.h
• sp_instr.cc