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BlobType (Hibernate API Documentation) - Hibernate 3.2.3 正式版 API 英文文档

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org.hibernate.type
Class BlobType

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

All Implemented Interfaces:

Serializable, Type

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public class BlobType

extends AbstractType

blob: A type that maps an SQL BLOB to a java.sql.Blob.

Author:

Gavin King

See Also:

Serialized Form

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Constructor Summary

BlobType()

 

Method Summary
int	compare(Object x, Object y, EntityMode entityMode)           compare two instances of the type
Object	deepCopy(Object value, EntityMode entityMode, SessionFactoryImplementor factory)           Return a deep copy of the persistent state, stopping at entities and at collections.
Serializable	disassemble(Object value, SessionImplementor session, Object owner)           Return a cacheable "disassembled" representation of the object.
Object	fromXMLNode(org.dom4j.Node xml, Mapping factory)           Parse the XML representation of an instance.
Object	get(ResultSet rs, String name)
int	getColumnSpan(Mapping mapping)           How many columns are used to persist this type.
int	getHashCode(Object x, EntityMode entityMode)           Get a hashcode, consistent with persistence "equality"
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	isEqual(Object x, Object y, EntityMode entityMode)           Compare two instances of the class mapped by this type for persistence "equality" - equality of persistent state.
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	set(PreparedStatement st, Object value, int index, SessionImplementor session)
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.

 

Methods inherited from class org.hibernate.type.AbstractType

assemble, beforeAssemble, getHashCode, getSemiResolvedType, hydrate, isAnyType, isAssociationType, isCollectionType, isComponentType, isDirty, isEntityType, 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

BlobType

public BlobType()

Method Detail

set

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

Throws:

HibernateException

SQLException

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get

public Object get(ResultSet rs,
                  String name)
           throws HibernateException,
                  SQLException

Throws:

HibernateException

SQLException

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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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isEqual

public boolean isEqual(Object x,
                       Object y,
                       EntityMode entityMode)

Description copied from interface: Type

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

Specified by:

isEqual in interface Type

Overrides:

isEqual in class AbstractType

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getHashCode

public int getHashCode(Object x,
                       EntityMode entityMode)

Description copied from interface: Type

Get a hashcode, consistent with persistence "equality"

Specified by:

getHashCode in interface Type

Overrides:

getHashCode in class AbstractType

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compare

public int compare(Object x,
                   Object y,
                   EntityMode entityMode)

Description copied from interface: Type

compare two instances of the type

Specified by:

compare in interface Type

Overrides:

compare in class AbstractType

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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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disassemble

public Serializable disassemble(Object value,
                                SessionImplementor session,
                                Object owner)
                         throws HibernateException

Description copied from interface: Type

Return a cacheable "disassembled" representation of the object.

Specified by:

disassemble in interface Type

Overrides:

disassemble in class AbstractType

Throws:

HibernateException

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deepCopy

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

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

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fromXMLNode

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

Description copied from interface: Type

Parse the XML representation of an instance.

Parameters:

xml -

factory -

Returns:

an instance of the type

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getColumnSpan

public int getColumnSpan(Mapping mapping)

Description copied from interface: Type

How many columns are used to persist this type.

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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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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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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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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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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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replace

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

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

Throws:

HibernateException

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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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setToXMLNode

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

Description copied from interface: Type

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

Parameters:

value -

factory -

Returns:

String

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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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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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SUMMARY: NESTED | FIELD | CONSTR | METHOD	DETAIL: FIELD | CONSTR | METHOD

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