org.hibernate.mapping

Class Constraint

java.lang.Object

org.hibernate.mapping.Constraint

All Implemented Interfaces:

Serializable, Exportable, RelationalModel

Direct Known Subclasses:

ForeignKey, PrimaryKey, UniqueKey

public abstract class Constraint
extends Object
implements RelationalModel, Exportable, Serializable

A relational constraint.

Author:

Gavin King, Brett Meyer

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
Constraint()

Method Summary

Modifier and Type	Method and Description
void	addColumn(Column column)
void	addColumns(Iterator columnIterator)
Iterator<Column>	columnIterator()
boolean	containsColumn(Column column)
abstract String	generatedConstraintNamePrefix()
static String	generateName(String prefix, Table table, Column... columns) If a constraint is not explicitly named, this is called to generate a unique hash using the table and column names.
static String	generateName(String prefix, Table table, List<Column> columns) Helper method for generateName(String, Table, Column...).
Column	getColumn(int i)
Iterator<Column>	getColumnIterator()
List<Column>	getColumns()
int	getColumnSpan()
String	getName()
Table	getTable()
static String	hashedName(String s) Hash a constraint name using MD5.
boolean	isGenerated(Dialect dialect)
void	setName(String name)
void	setTable(Table table)
abstract String	sqlConstraintString(Dialect d, String constraintName, String defaultCatalog, String defaultSchema)
String	sqlCreateString(Dialect dialect, Mapping p, String defaultCatalog, String defaultSchema)
String	sqlDropString(Dialect dialect, String defaultCatalog, String defaultSchema)
String	toString()

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.hibernate.boot.model.relational.Exportable

getExportIdentifier

Constructor Detail

Constraint

public Constraint()

Method Detail

getName

public String getName()

setName

public void setName(String name)

generateName

public static String generateName(String prefix,
                                  Table table,
                                  Column... columns)

If a constraint is not explicitly named, this is called to generate a unique hash using the table and column names. Static so the name can be generated prior to creating the Constraint. They're cached, keyed by name, in multiple locations.

Returns:

String The generated name

generateName

public static String generateName(String prefix,
                                  Table table,
                                  List<Column> columns)

Helper method for generateName(String, Table, Column...).

Returns:

String The generated name

hashedName

public static String hashedName(String s)

Hash a constraint name using MD5. Convert the MD5 digest to base 35 (full alphanumeric), guaranteeing that the length of the name will always be smaller than the 30 character identifier restriction enforced by a few dialects.

Parameters:

s - The name to be hashed.

Returns:

String The hased name.

addColumn

public void addColumn(Column column)

addColumns

public void addColumns(Iterator columnIterator)

containsColumn

public boolean containsColumn(Column column)

Returns:

true if this constraint already contains a column with same name.

getColumnSpan

public int getColumnSpan()

getColumn

public Column getColumn(int i)

getColumnIterator

public Iterator<Column> getColumnIterator()

columnIterator

public Iterator<Column> columnIterator()

getTable

public Table getTable()

setTable

public void setTable(Table table)

isGenerated

public boolean isGenerated(Dialect dialect)

sqlDropString

public String sqlDropString(Dialect dialect,
                            String defaultCatalog,
                            String defaultSchema)

Specified by:

sqlDropString in interface RelationalModel

sqlCreateString

public String sqlCreateString(Dialect dialect,
                              Mapping p,
                              String defaultCatalog,
                              String defaultSchema)

Specified by:

sqlCreateString in interface RelationalModel

getColumns

public List<Column> getColumns()

sqlConstraintString

public abstract String sqlConstraintString(Dialect d,
                                           String constraintName,
                                           String defaultCatalog,
                                           String defaultSchema)

toString

public String toString()

Overrides:

toString in class Object

generatedConstraintNamePrefix

public abstract String generatedConstraintNamePrefix()

Returns:

String The prefix to use in generated constraint names. Examples: "UK_", "FK_", and "PK_".