Check_constraint_column_dependency_checker Class Reference

Helper class to check if an ALTER statement performs a disallowed modification on a column depended on by a Check constraint. More...

#include <sql_check_constraint.h>

Public Member Functions
	Check_constraint_column_dependency_checker (const Sql_check_constraint_spec_list &check_constraint_list)
bool	operator() (const Alter_drop *drop)
	Method to check if column being dropped is in use by check constraints. More...
bool	operator() (const Alter_column *alter_column)
	Method to check if a column being altered with the RENAME COLUMN or SET MASKING POLICY clause of the ALTER TABLE statement is in use by check constraints. More...
bool	operator() (const Create_field &fld)
	Method to check if the CHANGE COLUMN or MODIFY COLUMN clause of the ALTER TABLE statement renames a column or assigns a masking policy to a column which is in use by check constraints. More...

Private Types
enum class	Operation { kDropColumn , kRenameColumn , kSetMaskingPolicy }

Private Member Functions
bool	any_check_constraint_uses_column (const char *column_name, Operation operation)
	Check if any check constraint uses "column_name". More...

Private Attributes
const Sql_check_constraint_spec_list &	m_check_constraint_list
	Check constraint specification list. More...

Detailed Description

Helper class to check if an ALTER statement performs a disallowed modification on a column depended on by a Check constraint.

Disallowed modifications include:

• DROP COLUMN
• RENAME COLUMN
• SET MASKING POLICY

Member Enumeration Documentation

Operation

enum class Check_constraint_column_dependency_checker::Operation

strongprivate

Enumerator
kDropColumn
kRenameColumn
kSetMaskingPolicy

Constructor & Destructor Documentation

Check_constraint_column_dependency_checker()

Check_constraint_column_dependency_checker::Check_constraint_column_dependency_checker ( const Sql_check_constraint_spec_list &  check_constraint_list )

inlineexplicit

Member Function Documentation

any_check_constraint_uses_column()

bool Check_constraint_column_dependency_checker::any_check_constraint_uses_column ( const char *  column_name, Operation  operation  )

private

Check if any check constraint uses "column_name".

Parameters

column_name	Column name.
operation	Which operation is performed on the column.

Return values

true	If column is used by the check constraint.
false	Otherwise.

operator()() [1/3]

bool Check_constraint_column_dependency_checker::operator()

(

const Alter_column *

alter_column

)

Method to check if a column being altered with the RENAME COLUMN or SET MASKING POLICY clause of the ALTER TABLE statement is in use by check constraints.

Parameters

alter_column

Instance of Alter_column.

Return values

true	If some check constraint uses the column being renamed.
false	Otherwise.

operator()() [2/3]

bool Check_constraint_column_dependency_checker::operator()

(

const Alter_drop *

drop

)

Method to check if column being dropped is in use by check constraints.

Parameters

drop	Instance of Alter_drop.

Return values

true	If some check constraint uses the column being dropped.
false	Otherwise.

operator()() [3/3]

bool Check_constraint_column_dependency_checker::operator()

(

const Create_field &

fld

)

Method to check if the CHANGE COLUMN or MODIFY COLUMN clause of the ALTER TABLE statement renames a column or assigns a masking policy to a column which is in use by check constraints.

Parameters

fld	Instance of Create_field.

Return values

true	If some check constraint uses the column being renamed.
false	Otherwise.

Member Data Documentation

m_check_constraint_list

const Sql_check_constraint_spec_list& Check_constraint_column_dependency_checker::m_check_constraint_list

private

Check constraint specification list.

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

• sql/sql_check_constraint.h
• sql/sql_check_constraint.cc