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MetaType (Hibernate API Documentation) - Hibernate 2.1.8 正式版 API 英文文档

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net.sf.hibernate.type
Class MetaType

java.lang.Object
  net.sf.hibernate.type.AbstractType
      net.sf.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)           Return a deep copy of the persistent state, stopping at entities and at collections.
boolean	equals(Object x, Object y)           Compare two instances of the class mapped by this type for persistence "equality", ie.
Object	fromString(String xml)           Parse the XML representation of an instance.
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	hasNiceEquals()           Does this type implement a well-behaved equals() method.
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, SessionImplementor session)           Write an instance of the mapped class to a prepared statement.
int[]	sqlTypes(Mapping mapping)           Return the SQL type codes for the columns mapped by this type.
String	toString(Object value, SessionFactoryImplementor factory)           A representation of the value to be embedded in an XML element.

 

Methods inherited from class net.sf.hibernate.type.AbstractType

assemble, copy, disassemble, equals, hashCode, hydrate, isAssociationType, isComponentType, isDirty, isEntityType, isModified, isObjectType, isPersistentCollectionType, resolveIdentifier

 

Methods inherited from class java.lang.Object

clone, finalize, getClass, 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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equals

public boolean equals(Object x,
                      Object y)
               throws HibernateException

Description copied from interface: Type

Compare two instances of the class mapped by this type for persistence "equality", ie. Equality of persistent state.

Parameters:

x -

y -

Returns:

boolean

Throws:

HibernateException

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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:

HibernateException

SQLException

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:

SQLException

HibernateException

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toString

public String toString(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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fromString

public Object fromString(String xml)
                  throws HibernateException

Description copied from interface: Type

Parse the XML representation of an instance.

Parameters:

xml -

Returns:

an instance of the type

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)
                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

Returns:

Object a copy

Throws:

HibernateException

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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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hasNiceEquals

public boolean hasNiceEquals()

Description copied from interface: Type

Does this type implement a well-behaved equals() method. (ie. one that is consistent with Type.equals().) Strictly, if this method returns true then x.equals(y) implies Type.equals(x, y) and also Type.equals(x, y) implies that probably x.equals(y)

See Also:

Object.equals(java.lang.Object), Type.equals(java.lang.Object, java.lang.Object)

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