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MetaType (Hibernate API Documentation) - Hibernate 3.2.4 正式版 API 英文文档

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org.hibernate.type
Class MetaType

java.lang.Object
  org.hibernate.type.AbstractType
      org.hibernate.type.MetaType

All Implemented Interfaces:

Serializable, Type

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public class MetaType

extends AbstractType

Author:

Gavin King

See Also:

Serialized Form

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Constructor Summary

MetaType(Map values, Type baseType)

 

Method Summary
Object	deepCopy(Object value, EntityMode entityMode, SessionFactoryImplementor factory)           Return a deep copy of the persistent state, stopping at entities and at collections.
Object	fromXMLNode(org.dom4j.Node xml, Mapping factory)           Parse the XML representation of an instance.
Object	fromXMLString(String xml, Mapping factory)
int	getColumnSpan(Mapping mapping)           How many columns are used to persist this type.
String	getName()           Returns the abbreviated name of the type.
Class	getReturnedClass()           The class returned by nullSafeGet() methods.
boolean	isDirty(Object old, Object current, boolean[] checkable, SessionImplementor session)           Should the parent be considered dirty, given both the old and current field or element value?
boolean	isMutable()           Are objects of this type mutable.
Object	nullSafeGet(ResultSet rs, String[] names, SessionImplementor session, Object owner)           Retrieve an instance of the mapped class from a JDBC resultset.
Object	nullSafeGet(ResultSet rs, String name, SessionImplementor session, Object owner)           Retrieve an instance of the mapped class from a JDBC resultset.
void	nullSafeSet(PreparedStatement st, Object value, int index, boolean[] settable, SessionImplementor session)           Write an instance of the mapped class to a prepared statement, ignoring some columns.
void	nullSafeSet(PreparedStatement st, Object value, int index, SessionImplementor session)           Write an instance of the mapped class to a prepared statement.
Object	replace(Object original, Object target, SessionImplementor session, Object owner, Map copyCache)           During merge, replace the existing (target) value in the entity we are merging to with a new (original) value from the detached entity we are merging.
void	setToXMLNode(org.dom4j.Node node, Object value, SessionFactoryImplementor factory)           A representation of the value to be embedded in an XML element.
int[]	sqlTypes(Mapping mapping)           Return the SQL type codes for the columns mapped by this type.
boolean[]	toColumnNullness(Object value, Mapping mapping)           Given an instance of the type, return an array of boolean, indicating which mapped columns would be null.
String	toLoggableString(Object value, SessionFactoryImplementor factory)           A representation of the value to be embedded in a log file.
String	toXMLString(Object value, SessionFactoryImplementor factory)

 

Methods inherited from class org.hibernate.type.AbstractType

assemble, beforeAssemble, compare, disassemble, getHashCode, getHashCode, getSemiResolvedType, hydrate, isAnyType, isAssociationType, isCollectionType, isComponentType, isDirty, isEntityType, isEqual, isEqual, isModified, isSame, isXMLElement, replace, replaceNode, resolve, semiResolve

 

Methods inherited from class java.lang.Object

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

 

Constructor Detail

MetaType

public MetaType(Map values,
                Type baseType)

Method Detail

sqlTypes

public int[] sqlTypes(Mapping mapping)
               throws MappingException

Description copied from interface: Type

Return the SQL type codes for the columns mapped by this type. The codes are defined on java.sql.Types.

Returns:

the typecodes

Throws:

MappingException

See Also:

Types

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getColumnSpan

public int getColumnSpan(Mapping mapping)
                  throws MappingException

Description copied from interface: Type

How many columns are used to persist this type.

Throws:

MappingException

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getReturnedClass

public Class getReturnedClass()

Description copied from interface: Type

The class returned by nullSafeGet() methods. This is used to establish the class of an array of this type.

Returns:

Class

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nullSafeGet

public Object nullSafeGet(ResultSet rs,
                          String[] names,
                          SessionImplementor session,
                          Object owner)
                   throws HibernateException,
                          SQLException

Description copied from interface: Type

Retrieve an instance of the mapped class from a JDBC resultset. Implementors should handle possibility of null values.

Parameters:

rs -

names - the column names

session -

owner - the parent entity

Returns:

Object

Throws:

SQLException

HibernateException

See Also:

alternative, 2-phase property initialization

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nullSafeGet

public Object nullSafeGet(ResultSet rs,
                          String name,
                          SessionImplementor session,
                          Object owner)
                   throws HibernateException,
                          SQLException

Description copied from interface: Type

Retrieve an instance of the mapped class from a JDBC resultset. Implementations should handle possibility of null values. This method might be called if the type is known to be a single-column type.

Parameters:

rs -

name - the column name

session -

owner - the parent entity

Returns:

Object

Throws:

SQLException

HibernateException

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nullSafeSet

public void nullSafeSet(PreparedStatement st,
                        Object value,
                        int index,
                        SessionImplementor session)
                 throws HibernateException,
                        SQLException

Description copied from interface: Type

Write an instance of the mapped class to a prepared statement. Implementors should handle possibility of null values. A multi-column type should be written to parameters starting from index.

Parameters:

st -

value - the object to write

index - statement parameter index

session -

Throws:

HibernateException

SQLException

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nullSafeSet

public void nullSafeSet(PreparedStatement st,
                        Object value,
                        int index,
                        boolean[] settable,
                        SessionImplementor session)
                 throws HibernateException,
                        SQLException

Description copied from interface: Type

Write an instance of the mapped class to a prepared statement, ignoring some columns. Implementors should handle possibility of null values. A multi-column type should be written to parameters starting from index.

Parameters:

st -

value - the object to write

index - statement parameter index

settable - an array indicating which columns to ignore

session -

Throws:

SQLException

HibernateException

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toLoggableString

public String toLoggableString(Object value,
                               SessionFactoryImplementor factory)
                        throws HibernateException

Description copied from interface: Type

A representation of the value to be embedded in a log file.

Parameters:

value -

factory -

Returns:

String

Throws:

HibernateException

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toXMLString

public String toXMLString(Object value,
                          SessionFactoryImplementor factory)
                   throws HibernateException

Throws:

HibernateException

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fromXMLString

public Object fromXMLString(String xml,
                            Mapping factory)
                     throws HibernateException

Throws:

HibernateException

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getName

public String getName()

Description copied from interface: Type

Returns the abbreviated name of the type.

Returns:

String the Hibernate type name

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deepCopy

public Object deepCopy(Object value,
                       EntityMode entityMode,
                       SessionFactoryImplementor factory)
                throws HibernateException

Description copied from interface: Type

Return a deep copy of the persistent state, stopping at entities and at collections.

Parameters:

value - generally a collection element or entity field

entityMode -

factory -

Returns:

Object a copy

Throws:

HibernateException

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replace

public Object replace(Object original,
                      Object target,
                      SessionImplementor session,
                      Object owner,
                      Map copyCache)

Description copied from interface: Type

During merge, replace the existing (target) value in the entity we are merging to with a new (original) value from the detached entity we are merging. For immutable objects, or null values, it is safe to simply return the first parameter. For mutable objects, it is safe to return a copy of the first parameter. For objects with component values, it might make sense to recursively replace component values.

Parameters:

original - the value from the detached entity being merged

target - the value in the managed entity

Returns:

the value to be merged

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isMutable

public boolean isMutable()

Description copied from interface: Type

Are objects of this type mutable. (With respect to the referencing object ... entities and collections are considered immutable because they manage their own internal state.)

Returns:

boolean

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fromXMLNode

public Object fromXMLNode(org.dom4j.Node xml,
                          Mapping factory)
                   throws HibernateException

Description copied from interface: Type

Parse the XML representation of an instance.

Parameters:

xml -

factory -

Returns:

an instance of the type

Throws:

HibernateException

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setToXMLNode

public void setToXMLNode(org.dom4j.Node node,
                         Object value,
                         SessionFactoryImplementor factory)
                  throws HibernateException

Description copied from interface: Type

A representation of the value to be embedded in an XML element.

Parameters:

value -

factory -

Returns:

String

Throws:

HibernateException

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toColumnNullness

public boolean[] toColumnNullness(Object value,
                                  Mapping mapping)

Description copied from interface: Type

Given an instance of the type, return an array of boolean, indicating which mapped columns would be null.

Parameters:

value - an instance of the type

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isDirty

public boolean isDirty(Object old,
                       Object current,
                       boolean[] checkable,
                       SessionImplementor session)
                throws HibernateException

Description copied from interface: Type

Should the parent be considered dirty, given both the old and current field or element value?

Parameters:

old - the old value

current - the current value

checkable - which columns are actually updatable

session -

Returns:

true if the field is dirty

Throws:

HibernateException

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