Trigger_chain Class Reference

#include <trigger_chain.h>

Public Member Functions
	Trigger_chain ()=default
	~Trigger_chain ()
List< Trigger > &	get_trigger_list ()
bool	add_trigger (MEM_ROOT *mem_root, Trigger *new_trigger, enum_trigger_order_type ordering_clause, const LEX_CSTRING &referenced_trigger_name)
	Add a new trigger into the list of triggers with the same ACTION/TIMING value combination. More...
bool	add_trigger (MEM_ROOT *mem_root, Trigger *new_trigger)
	Add a new trigger into the list of triggers with the same ACTION/TIMING value combination. More...
bool	execute_triggers (THD *thd)
	Run every trigger in the list of triggers. More...
void	add_tables_and_routines (THD *thd, Query_tables_list *prelocking_ctx, Table_ref *table_list)
	Iterate over the list of triggers and add tables and routines used by trigger to the set of elements used by statement. More...
void	mark_fields (TABLE *subject_table)
	Iterate over the list of triggers and mark fields of subject table which we read/set in every trigger. More...
bool	has_updated_trigger_fields (const MY_BITMAP *used_fields)
	Iterate over the list of triggers and check whether some table's fields are used in any trigger. More...

Private Attributes
List< Trigger >	m_triggers
	List of triggers of this chain. More...

Constructor & Destructor Documentation

Trigger_chain()

Trigger_chain::Trigger_chain ( )

default

~Trigger_chain()

Trigger_chain::~Trigger_chain

(

)

Member Function Documentation

add_tables_and_routines()

void Trigger_chain::add_tables_and_routines	(	THD *	thd,
		Query_tables_list *	prelocking_ctx,
		Table_ref *	table_list
	)

Iterate over the list of triggers and add tables and routines used by trigger to the set of elements used by statement.

Parameters

[in]	thd	thread context
[in,out]	prelocking_ctx	prelocking context of the statement
[in]	table_list	Table_ref for the table

add_trigger() [1/2]

bool Trigger_chain::add_trigger	(	MEM_ROOT *	mem_root,
		Trigger *	new_trigger
	)

Add a new trigger into the list of triggers with the same ACTION/TIMING value combination.

This method is called when a trigger is loaded from Data Dictionary.

Parameters

mem_root	memory root for allocations
new_trigger	pointer to the Trigger to add into the list

Returns

Operation status.

Return values

false	Success.
true	Failure.

add_trigger() [2/2]

bool Trigger_chain::add_trigger	(	MEM_ROOT *	mem_root,
		Trigger *	new_trigger,
		enum_trigger_order_type	ordering_clause,
		const LEX_CSTRING &	referenced_trigger_name
	)

Add a new trigger into the list of triggers with the same ACTION/TIMING value combination.

This method is called during handling of statement CREATE TRIGGER.

Parameters

mem_root	memory root for allocations
new_trigger	pointer to the Trigger to add into the list
ordering_clause	trigger ordering clause (FOLLOWS/PRECEDES)
referenced_trigger_name	trigger name referenced by clause FOLLOWS/PRECEDES in the CREATE TRIGGER statement

Returns

Operation status.

Return values

false	Success.
true	Failure: either trigger not found or OOM. Set error in Diagnostic_area in case when trigger not found.

execute_triggers()

bool Trigger_chain::execute_triggers

(

THD *

thd

)

Run every trigger in the list of triggers.

Parameters

thd	Thread context

Returns

Result of trigger execution

Return values

false	all triggers in the list were executed successfully.
true	some trigger was failed. We stop triggers execution on the first failed trigger and don't attempt to finish the rest of triggers located after the failed one.

get_trigger_list()

List< Trigger > & Trigger_chain::get_trigger_list ( )

inline

Returns

a reference to the list of triggers with the same EVENT/ACTION_TIME assigned to the table.

has_updated_trigger_fields()

bool Trigger_chain::has_updated_trigger_fields

(

const MY_BITMAP *

used_fields

)

Iterate over the list of triggers and check whether some table's fields are used in any trigger.

Parameters

[in]

used_fields

bitmap of fields to check

Returns

Check result

Return values

true	Some table fields are used in trigger
false	None of table fields are used in trigger

mark_fields()

void Trigger_chain::mark_fields

(

TABLE *

subject_table

)

Iterate over the list of triggers and mark fields of subject table which we read/set in every trigger.

Parameters

[in]

subject_table

trigger subject table

Member Data Documentation

m_triggers

List<Trigger> Trigger_chain::m_triggers

private

List of triggers of this chain.

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

• sql/trigger_chain.h
• sql/trigger_chain.cc