Class DbAttribute

java.lang.Object

org.apache.cayenne.map.Attribute<DbEntity, DbAttribute, DbRelationship>

org.apache.cayenne.map.DbAttribute

All Implemented Interfaces:

Serializable, ConfigurationNode, CayenneMapEntry, XMLSerializable

public class DbAttribute
extends Attribute<DbEntity, DbAttribute, DbRelationship>
implements ConfigurationNode

A DbAttribute defines a descriptor for a single database table column.

See Also:

• Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
protected int	attributePrecision
protected boolean	generated	Defines whether this column value is generated by the database.
protected boolean	mandatory	Defines whether the attribute allows nulls.
protected int	maxLength
protected boolean	primaryKey	Defines whether the attribute is a part of the table primary key.
protected int	scale
protected int	type	Defines JDBC type of the column.

Fields inherited from class Attribute

entity, name

Constructor Summary

Constructors

Constructor	Description
DbAttribute()
DbAttribute(String name)
DbAttribute(String name, int type, DbEntity entity)

Method Summary

Modifier and Type	Method	Description
<T> T	acceptVisitor(ConfigurationNodeVisitor<T> visitor)
void	encodeAsXML(XMLEncoder encoder, ConfigurationNodeVisitor delegate)	Prints itself as XML to the provided XMLEncoder.
String	getAliasedName(String alias)
int	getAttributePrecision()
DbEntity	getEntity()	Returns parent entity that holds this attribute.
String	getJavaClass()
int	getMaxLength()	Returns the length of database column described by this attribute.
int	getScale()	Returns the number of digits after period for decimal attributes.
int	getType()	Returns the SQL type of the column.
boolean	isForeignKey()	Returns true if the DB column represented by this attribute is a foreign key, referencing another table.
boolean	isGenerated()	Returns true if this column value is generated by the database.
boolean	isMandatory()
boolean	isPrimaryKey()
void	setAttributePrecision(int attributePrecision)
void	setGenerated(boolean generated)	Updates attribute "generated" property.
void	setMandatory(boolean mandatory)
void	setMaxLength(int maxLength)	Sets the length of character or binary type or max num of digits for DECIMAL.
void	setPrimaryKey(boolean primaryKey)	Updates attribute "primaryKey" property.
void	setScale(int scale)
void	setType(int type)	Sets the SQL type for the column.
String	toString()

Methods inherited from class Attribute

getName, getParent, setEntity, setName, setParent

Methods inherited from class Object

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

Field Details

type

protected int type

Defines JDBC type of the column.

mandatory

protected boolean mandatory

Defines whether the attribute allows nulls.

primaryKey

protected boolean primaryKey

Defines whether the attribute is a part of the table primary key.

generated

protected boolean generated

Defines whether this column value is generated by the database. Other terms for such columns are "auto-increment" or "identity".

Since:

1.2

maxLength

protected int maxLength

scale

protected int scale

Since:

3.0

attributePrecision

protected int attributePrecision

Since:

3.0

Constructor Details

DbAttribute

public DbAttribute()

DbAttribute

public DbAttribute(String name)

DbAttribute

public DbAttribute(String name,
 int type,
 DbEntity entity)

Method Details

getEntity

public DbEntity getEntity()

Description copied from class: Attribute

Returns parent entity that holds this attribute.

Overrides:

getEntity in class Attribute<DbEntity, DbAttribute, DbRelationship>

acceptVisitor

public <T> T acceptVisitor(ConfigurationNodeVisitor<T> visitor)

Specified by:

acceptVisitor in interface ConfigurationNode

encodeAsXML

public void encodeAsXML(XMLEncoder encoder,
 ConfigurationNodeVisitor delegate)

Prints itself as XML to the provided XMLEncoder.

Specified by:

encodeAsXML in interface XMLSerializable

Specified by:

encodeAsXML in class Attribute<DbEntity, DbAttribute, DbRelationship>

Since:

1.1

getAliasedName

public String getAliasedName(String alias)

getType

public int getType()

Returns the SQL type of the column.

See Also:

• Types

setType

public void setType(int type)

Sets the SQL type for the column.

See Also:

• Types

isPrimaryKey

public boolean isPrimaryKey()

isForeignKey

public boolean isForeignKey()

Returns true if the DB column represented by this attribute is a foreign key, referencing another table.

Since:

1.1

setPrimaryKey

public void setPrimaryKey(boolean primaryKey)

Updates attribute "primaryKey" property.

isMandatory

public boolean isMandatory()

setMandatory

public void setMandatory(boolean mandatory)

getMaxLength

public int getMaxLength()

Returns the length of database column described by this attribute.

setMaxLength

public void setMaxLength(int maxLength)

Sets the length of character or binary type or max num of digits for DECIMAL.

isGenerated

public boolean isGenerated()

Returns true if this column value is generated by the database. Other terms for such columns are "auto-increment" or "identity".

Since:

1.2

setGenerated

public void setGenerated(boolean generated)

Updates attribute "generated" property.

Since:

1.2

getAttributePrecision

public int getAttributePrecision()

Since:

3.0

setAttributePrecision

public void setAttributePrecision(int attributePrecision)

Since:

3.0

getScale

public int getScale()

Returns the number of digits after period for decimal attributes. Returns "-1" if not set.

Since:

3.0

setScale

public void setScale(int scale)

Since:

3.0

getJavaClass

public String getJavaClass()

Returns:

java class guessed by the JDBC type of this attribute

Since:

5.0

toString

public String toString()

Overrides:

toString in class Attribute<DbEntity, DbAttribute, DbRelationship>