Class ConstraintUnique

java.lang.Object

org.h2.engine.DbObject

org.h2.schema.SchemaObject

org.h2.constraint.Constraint

org.h2.constraint.ConstraintUnique

All Implemented Interfaces:

Comparable<Constraint>, HasSQL

public class ConstraintUnique
extends Constraint

A unique constraint. This object always backed by a unique index.

Nested Class Summary

Nested classes/interfaces inherited from class Constraint

Constraint.Type

Field Summary

Fields

Modifier and Type	Field	Description
private IndexColumn[]	columns
private Index	index
private boolean	indexOwner
private final boolean	primaryKey

Fields inherited from class Constraint

table

Fields inherited from class DbObject

AGGREGATE, comment, COMMENT, CONSTANT, CONSTRAINT, database, DOMAIN, FUNCTION_ALIAS, INDEX, RIGHT, ROLE, SCHEMA, SEQUENCE, SETTING, SYNONYM, TABLE_OR_VIEW, trace, TRIGGER, USER

Fields inherited from interface HasSQL

ADD_PLAN_INFORMATION, DEFAULT_SQL_FLAGS, NO_CASTS, QUOTE_ONLY_WHEN_REQUIRED, REPLACE_LOBS_FOR_TRACE, TRACE_SQL_FLAGS

Constructor Summary

Constructors

Constructor	Description
ConstraintUnique(Schema schema, int id, String name, Table table, boolean primaryKey)

Method Summary

Modifier and Type	Method	Description
void	checkExistingData(SessionLocal session)	Check the existing data.
void	checkRow(SessionLocal session, Table t, Row oldRow, Row newRow)	Check if this row fulfils the constraint.
IndexColumn[]	getColumns()
Constraint.Type	getConstraintType()	The constraint type name
String	getCreateSQL()	Construct the CREATE ...
String	getCreateSQLForCopy(Table forTable, String quotedName)	Build a SQL statement to re-create the object, or to create a copy of the object with a different name or referencing a different table
private String	getCreateSQLForCopy(Table forTable, String quotedName, boolean internalIndex)
String	getCreateSQLWithoutIndexes()	Get the SQL statement to create this constraint.
Index	getIndex()	Get the index of this constraint in the source table, or null if no index is used.
HashSet<Column>	getReferencedColumns(Table table)	Get all referenced columns.
boolean	isBefore()	Check if this constraint needs to be checked before updating the data.
void	rebuild()	This method is called after a related table has changed (the table was renamed, or columns have been renamed).
void	removeChildrenAndResources(SessionLocal session)	Delete all dependent children objects and resources of this object.
void	setColumns(IndexColumn[] columns)
void	setIndex(Index index, boolean isOwner)	Set the index to use for this unique constraint.
void	setIndexOwner(Index index)	This index is now the owner of the specified index.
boolean	usesIndex(Index idx)	Check if this constraint needs the specified index.

Methods inherited from class Constraint

compareTo, getExpression, getReferencedConstraint, getRefTable, getTable, getType, isEverything, isHidden

Methods inherited from class SchemaObject

getSchema, getSQL, getSQL

Methods inherited from class DbObject

checkRename, getChildren, getComment, getCreateSQLForMeta, getDatabase, getDropSQL, getId, getModificationId, getName, invalidate, isTemporary, isValid, rename, setComment, setModified, setObjectName, setTemporary, toString

Methods inherited from class Object

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

Methods inherited from interface HasSQL

getTraceSQL

Field Details

index

private Index index

indexOwner

private boolean indexOwner

columns

private IndexColumn[] columns

primaryKey

private final boolean primaryKey

Constructor Details

ConstraintUnique

public ConstraintUnique(Schema schema,
 int id,
 String name,
 Table table,
 boolean primaryKey)

Method Details

getConstraintType

public Constraint.Type getConstraintType()

Description copied from class: Constraint

The constraint type name

Specified by:

getConstraintType in class Constraint

Returns:

the name

getCreateSQLForCopy

public String getCreateSQLForCopy(Table forTable,
 String quotedName)

Description copied from class: DbObject

Build a SQL statement to re-create the object, or to create a copy of the object with a different name or referencing a different table

Specified by:

getCreateSQLForCopy in class DbObject

Parameters:

forTable - the new table

quotedName - the quoted name

Returns:

the SQL statement

getCreateSQLForCopy

private String getCreateSQLForCopy(Table forTable,
 String quotedName,
 boolean internalIndex)

getCreateSQLWithoutIndexes

public String getCreateSQLWithoutIndexes()

Description copied from class: Constraint

Get the SQL statement to create this constraint.

Specified by:

getCreateSQLWithoutIndexes in class Constraint

Returns:

the SQL statement

getCreateSQL

public String getCreateSQL()

Description copied from class: DbObject

Construct the CREATE ... SQL statement for this object.

Specified by:

getCreateSQL in class DbObject

Returns:

the SQL statement

setColumns

public void setColumns(IndexColumn[] columns)

getColumns

public IndexColumn[] getColumns()

setIndex

public void setIndex(Index index,
 boolean isOwner)

Set the index to use for this unique constraint.

Parameters:

index - the index

isOwner - true if the index is generated by the system and belongs to this constraint

removeChildrenAndResources

public void removeChildrenAndResources(SessionLocal session)

Description copied from class: DbObject

Delete all dependent children objects and resources of this object.

Specified by:

removeChildrenAndResources in class DbObject

Parameters:

session - the session

checkRow

public void checkRow(SessionLocal session,
 Table t,
 Row oldRow,
 Row newRow)

Description copied from class: Constraint

Check if this row fulfils the constraint. This method throws an exception if not.

Specified by:

checkRow in class Constraint

Parameters:

session - the session

t - the table

oldRow - the old row

newRow - the new row

usesIndex

public boolean usesIndex(Index idx)

Description copied from class: Constraint

Check if this constraint needs the specified index.

Specified by:

usesIndex in class Constraint

Parameters:

idx - the index

Returns:

true if the index is used

setIndexOwner

public void setIndexOwner(Index index)

Description copied from class: Constraint

This index is now the owner of the specified index.

Specified by:

setIndexOwner in class Constraint

Parameters:

index - the index

getReferencedColumns

public HashSet<Column> getReferencedColumns(Table table)

Description copied from class: Constraint

Get all referenced columns.

Specified by:

getReferencedColumns in class Constraint

Parameters:

table - the table

Returns:

the set of referenced columns

isBefore

public boolean isBefore()

Description copied from class: Constraint

Check if this constraint needs to be checked before updating the data.

Specified by:

isBefore in class Constraint

Returns:

true if it must be checked before updating

checkExistingData

public void checkExistingData(SessionLocal session)

Description copied from class: Constraint

Check the existing data. This method is called if the constraint is added after data has been inserted into the table.

Specified by:

checkExistingData in class Constraint

Parameters:

session - the session

getIndex

public Index getIndex()

Description copied from class: Constraint

Get the index of this constraint in the source table, or null if no index is used.

Overrides:

getIndex in class Constraint

Returns:

the index

rebuild

public void rebuild()

Description copied from class: Constraint

This method is called after a related table has changed (the table was renamed, or columns have been renamed).

Specified by:

rebuild in class Constraint