Drop_constraint_type_resolver Class Reference

Class to resolve constraints type for the constraints specified in the ALTER TABLE ... DROP CONSTRAINT operation. More...

#include <sql_constraint.h>

Inheritance diagram for Drop_constraint_type_resolver:

Public Member Functions
	Drop_constraint_type_resolver (Alter_info *alter_info)
	~Drop_constraint_type_resolver () override
bool	is_type_resolution_needed () const override
	Method to check if constraint type resolution is needed. More...
bool	resolve_constraints_type (THD *thd, const TABLE *src_table, const dd::Table *dd_src_table) override
	Method to resolve constraints type. More...
Public Member Functions inherited from Constraint_type_resolver
	Constraint_type_resolver (Alter_info *alter_info)
virtual	~Constraint_type_resolver ()=default

Private Member Functions
bool	resolve_constraint_type (THD *thd, const TABLE *src_table, const dd::Table *dd_src_table, const Alter_drop *drop)
	Method to resolve constraint type. More...

Private Attributes
ulonglong	m_flags {0}
	Flags set in Alter_info::flags while fixing type for constraint. More...
uint	m_first_fixed_alter_drop_pos {0}

Additional Inherited Members
Protected Member Functions inherited from Constraint_type_resolver
KEY *	is_primary_or_unique_constraint (const TABLE *src_table, const char *name)
	Helper method to check if "name" type is PRIMARY or UNIQUE constraint. More...
bool	is_referential_constraint (const dd::Table *dd_src_table, const char *name)
	Helper method to check if "name" type is REFERENTIAL constraint. More...
bool	is_check_constraint (const TABLE *src_table, const char *name)
	Helper method to check if "name" type is CHECK constraint. More...
Protected Attributes inherited from Constraint_type_resolver
Alter_info *	m_alter_info
	Alter_info instance describing table being altered. More...

Detailed Description

Class to resolve constraints type for the constraints specified in the ALTER TABLE ... DROP CONSTRAINT operation.

For a constraint specified in the DROP CONSTRAINT operations of a ALTER TABLE statement, actual constraint type is unknown. This is the class to resolve actual constraint type (PRIMARY, UNIQUE, FOREIGN KEY or CHECK) by constraint name. Alter_drop elements with actual constraint type are added to the Alter_info::Alter_drop list. To make changes safe for re-execution of a stored routines and prepared statements, elements added to Alter_drop list are removed in the destructor.

Constructor & Destructor Documentation

Drop_constraint_type_resolver()

Drop_constraint_type_resolver::Drop_constraint_type_resolver ( Alter_info *  alter_info )

inlineexplicit

~Drop_constraint_type_resolver()

Drop_constraint_type_resolver::~Drop_constraint_type_resolver ( )

override

Member Function Documentation

is_type_resolution_needed()

bool Drop_constraint_type_resolver::is_type_resolution_needed ( ) const

overridevirtual

Method to check if constraint type resolution is needed.

Return values

true	if ALTER TABLE statement has DROP CONSTRAINT operations.
false	Otherwise.

Implements Constraint_type_resolver.

resolve_constraint_type()

bool Drop_constraint_type_resolver::resolve_constraint_type ( THD *  thd, const TABLE *  src_table, const dd::Table *  dd_src_table, const Alter_drop *  drop  )

private

Method to resolve constraint type.

Parameters

thd	Thread handle.
src_table	TABLE instance of a source table.
dd_src_table	Data-dictionary table instance of a source table.
drop	Alter_drop instance for which type should be resolved.

Return values

false	Success.
true	Failure.

resolve_constraints_type()

bool Drop_constraint_type_resolver::resolve_constraints_type ( THD *  thd, const TABLE *  src_table, const dd::Table *  dd_src_table  )

overridevirtual

Method to resolve constraints type.

Parameters

thd	Thread handle.
src_table	TABLE instance of a source table.
dd_src_table	Data-dictionary table instance of a source table.

Return values

false	Success.
true	Failure.

Implements Constraint_type_resolver.

Member Data Documentation

m_first_fixed_alter_drop_pos

uint Drop_constraint_type_resolver::m_first_fixed_alter_drop_pos {0}

private

m_flags

ulonglong Drop_constraint_type_resolver::m_flags {0}

private

Flags set in Alter_info::flags while fixing type for constraint.

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

• sql/sql_constraint.h
• sql/sql_constraint.cc