org.apache.derby.iapi.sql.dictionary

Class ForeignKeyConstraintDescriptor

java.lang.Object

org.apache.derby.iapi.sql.dictionary.TupleDescriptor

org.apache.derby.iapi.sql.dictionary.ConstraintDescriptor

org.apache.derby.iapi.sql.dictionary.KeyConstraintDescriptor

org.apache.derby.iapi.sql.dictionary.ForeignKeyConstraintDescriptor

All Implemented Interfaces:

Dependable, Dependent, Provider, UniqueTupleDescriptor

public class ForeignKeyConstraintDescriptor
extends KeyConstraintDescriptor

A foreign key.

Field Summary

Fields

Modifier and Type	Field and Description
(package private) int	raDeleteRule
(package private) int	raUpdateRule
(package private) ReferencedKeyConstraintDescriptor	referencedConstraintDescriptor interface to this descriptor public ReferencedKeyConstraintDescriptor getReferencedConstraint() throws StandardException; public UUID getReferencedConstraintId() throws StandardException; public boolean isSelfReferencingFK() throws StandardException;
(package private) UUID	referencedConstraintId

Fields inherited from class org.apache.derby.iapi.sql.dictionary.KeyConstraintDescriptor

indexId

Fields inherited from class org.apache.derby.iapi.sql.dictionary.ConstraintDescriptor

ALL, constraintId, constraintName, DISABLED, ENABLED, isEnabled, SYSCONSTRAINTS_STATE_FIELD, table

Fields inherited from interface org.apache.derby.catalog.Dependable

ACTIVATION, ALIAS, COLUMNS_IN_TABLE, COLUMNS_PERMISSION, CONGLOMERATE, CONSTRAINT, DEFAULT, FILE, HEAP, INDEX, PERM, PREPARED_STATEMENT, ROLE_GRANT, ROUTINE_PERMISSION, SCHEMA, SEQUENCE, STORED_PREPARED_STATEMENT, TABLE, TABLE_PERMISSION, TRIGGER, VIEW

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	ForeignKeyConstraintDescriptor(DataDictionary dataDictionary, TableDescriptor table, java.lang.String constraintName, boolean deferrable, boolean initiallyDeferred, int[] fkColumns, UUID constraintId, UUID indexId, SchemaDescriptor schemaDesc, ReferencedKeyConstraintDescriptor referencedConstraintDescriptor, boolean isEnabled, int raDeleteRule, int raUpdateRule) Constructor for a ForeignKeyConstraintDescriptor
(package private)	ForeignKeyConstraintDescriptor(DataDictionary dataDictionary, TableDescriptor table, java.lang.String constraintName, boolean deferrable, boolean initiallyDeferred, int[] fkColumns, UUID constraintId, UUID indexId, SchemaDescriptor schemaDesc, UUID referencedConstraintId, boolean isEnabled, int raDeleteRule, int raUpdateRule) Constructor for a ForeignKeyConstraintDescriptor

Method Summary

Methods

Modifier and Type	Method and Description
int	getConstraintType() Gets an identifier telling what type of descriptor it is (UNIQUE, PRIMARY KEY, FOREIGN KEY, CHECK).
int	getRaDeleteRule() Gets a referential action rule on a DELETE
int	getRaUpdateRule() Gets a referential action rule on a UPDATE
ReferencedKeyConstraintDescriptor	getReferencedConstraint() Get the constraint that this FK references.
UUID	getReferencedConstraintId() Get the constraint id for the constraint that this FK references.
boolean	isSelfReferencingFK() Am I a self-referencing FK?
boolean	needsToFire(int stmtType, int[] modifiedCols) Does this constraint need to fire on this type of DML?

Methods inherited from class org.apache.derby.iapi.sql.dictionary.KeyConstraintDescriptor

getConglomerateId, getIndexConglomerateDescriptor, getIndexId, getIndexUUIDString, hasBackingIndex, toString

Methods inherited from class org.apache.derby.iapi.sql.dictionary.ConstraintDescriptor

areColumnsComparable, columnIntersects, deferrable, doColumnsIntersect, drop, getClassType, getColumnDescriptors, getConstraintName, getConstraintText, getDependableFinder, getDescriptorName, getDescriptorType, getKeyColumns, getObjectID, getObjectName, getReferenceCount, getReferencedColumns, getSchemaDescriptor, getTableDescriptor, getTableId, getUUID, initiallyDeferred, isEnabled, isReferenced, isValid, makeInvalid, prepareToInvalidate, setDisabled, setEnabled

Methods inherited from class org.apache.derby.iapi.sql.dictionary.TupleDescriptor

getColumnDependableFinder, getDataDictionary, getDependableFinder, isPersistent, setDataDictionary

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.apache.derby.catalog.Dependable

isPersistent

Field Detail

referencedConstraintDescriptor

ReferencedKeyConstraintDescriptor referencedConstraintDescriptor

interface to this descriptor

1. public ReferencedKeyConstraintDescriptor getReferencedConstraint() throws StandardException;
2. public UUID getReferencedConstraintId() throws StandardException;
3. public boolean isSelfReferencingFK() throws StandardException;

referencedConstraintId

UUID referencedConstraintId

raDeleteRule

int raDeleteRule

raUpdateRule

int raUpdateRule

Constructor Detail

ForeignKeyConstraintDescriptor

protected ForeignKeyConstraintDescriptor(DataDictionary dataDictionary,
                              TableDescriptor table,
                              java.lang.String constraintName,
                              boolean deferrable,
                              boolean initiallyDeferred,
                              int[] fkColumns,
                              UUID constraintId,
                              UUID indexId,
                              SchemaDescriptor schemaDesc,
                              ReferencedKeyConstraintDescriptor referencedConstraintDescriptor,
                              boolean isEnabled,
                              int raDeleteRule,
                              int raUpdateRule)

Constructor for a ForeignKeyConstraintDescriptor

Parameters:

dataDictionary - The data dictionary that this descriptor lives in

table - The descriptor of the table the constraint is on

constraintName - The name of the constraint.

deferrable - If the constraint can be deferred.

initiallyDeferred - If the constraint starts life deferred.

fkColumns - columns in the foreign key

constraintId - UUID of constraint

indexId - The UUID for the backing index

schemaDesc - The SchemaDescriptor for the constraint

referencedConstraintDescriptor - is referenced constraint descriptor

isEnabled - is the constraint enabled?

ForeignKeyConstraintDescriptor

ForeignKeyConstraintDescriptor(DataDictionary dataDictionary,
                              TableDescriptor table,
                              java.lang.String constraintName,
                              boolean deferrable,
                              boolean initiallyDeferred,
                              int[] fkColumns,
                              UUID constraintId,
                              UUID indexId,
                              SchemaDescriptor schemaDesc,
                              UUID referencedConstraintId,
                              boolean isEnabled,
                              int raDeleteRule,
                              int raUpdateRule)

Constructor for a ForeignKeyConstraintDescriptor

Parameters:

dataDictionary - The data dictionary that this descriptor lives in

table - The descriptor of the table the constraint is on

constraintName - The name of the constraint.

deferrable - If the constraint can be deferred.

initiallyDeferred - If the constraint starts life deferred.

fkColumns - columns in the foreign key

constraintId - UUID of constraint

indexId - The UUID for the backing index

schemaDesc - The SchemaDescriptor for the constraint

referencedConstraintId - is referenced constraint id

isEnabled - is the constraint enabled?

Method Detail

getReferencedConstraint

public ReferencedKeyConstraintDescriptor getReferencedConstraint()
                                                          throws StandardException

Get the constraint that this FK references. Will return either a primary key or a unique key constriant.

Returns:

the constraint

Throws:

StandardException - on error

getReferencedConstraintId

public UUID getReferencedConstraintId()
                               throws StandardException

Get the constraint id for the constraint that this FK references. Will return either a primary key or a unique key constriant.

Returns:

the constraint id

Throws:

StandardException - on error

getConstraintType

public int getConstraintType()

Gets an identifier telling what type of descriptor it is (UNIQUE, PRIMARY KEY, FOREIGN KEY, CHECK).

Specified by:

getConstraintType in class ConstraintDescriptor

Returns:

An identifier telling what type of descriptor it is (UNIQUE, PRIMARY KEY, FOREIGN KEY, CHECK).

needsToFire

public boolean needsToFire(int stmtType,
                  int[] modifiedCols)

Does this constraint need to fire on this type of DML? True if insert or update and columns intersect

Specified by:

needsToFire in class ConstraintDescriptor

Parameters:

stmtType - the type of DML (StatementType.INSERT|StatementType.UPDATE|StatementType.DELETE)

modifiedCols - the columns modified, or null for all

Returns:

true/false

isSelfReferencingFK

public boolean isSelfReferencingFK()
                            throws StandardException

Am I a self-referencing FK? True if my referenced constraint is on the same table as me.

Returns:

true/false

Throws:

StandardException - on error

getRaDeleteRule

public int getRaDeleteRule()

Gets a referential action rule on a DELETE

Returns:

referential rule defined by the user during foreign key creattion for a delete (like CASCDE , RESTRICT ..etc)

getRaUpdateRule

public int getRaUpdateRule()

Gets a referential action rule on a UPDATE

Returns:

referential rule defined by the user during foreign key creattion for an UPDATE (like CASCDE , RESTRICT ..etc)