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

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org.hibernate.type
Class NullableType

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

All Implemented Interfaces:

Serializable, Type

Direct Known Subclasses:

ImmutableType, MutableType

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public abstract class NullableType

extends AbstractType

Superclass of single-column nullable types.

Author:

Gavin King

See Also:

Serialized Form

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Constructor Summary

NullableType()

 

Method Summary
abstract  Object	fromStringValue(String xml)
Object	fromXMLNode(org.dom4j.Node xml, Mapping factory)           Parse the XML representation of an instance.
Object	fromXMLString(String xml, Mapping factory)
abstract  Object	get(ResultSet rs, String name)           Get a column value from a result set, without worrying about the possibility of null values.
int	getColumnSpan(Mapping session)           How many columns are used to persist this type.
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)
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.
Object	nullSafeGet(ResultSet rs, String name)
Object	nullSafeGet(ResultSet rs, String[] names)
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)
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.
String	nullSafeToString(Object value)           A null-safe version of toString(Object).
abstract  void	set(PreparedStatement st, Object value, int index)           Set a parameter value without worrying about the possibility of null values.
void	setToXMLNode(org.dom4j.Node xml, Object value, SessionFactoryImplementor factory)           A representation of the value to be embedded in an XML element.
abstract  int	sqlType()           A convenience form of sqlTypes(org.hibernate.engine.Mapping), returning just a single type value since these are explicitly dealing with single column mappings.
int[]	sqlTypes(Mapping session)           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.
abstract  String	toString(Object value)
String	toXMLString(Object value, SessionFactoryImplementor pc)

 

Methods inherited from class org.hibernate.type.AbstractType

assemble, beforeAssemble, compare, disassemble, getHashCode, 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

 

Methods inherited from interface org.hibernate.type.Type

deepCopy, getName, getReturnedClass, isMutable, replace

 

Constructor Detail

NullableType

public NullableType()

Method Detail

get

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

Get a column value from a result set, without worrying about the possibility of null values. Called from nullSafeGet(java.sql.ResultSet, java.lang.String[], org.hibernate.engine.SessionImplementor, java.lang.Object) after nullness checks have been performed.

Parameters:

rs - The result set from which to extract the value.

name - The name of the value to extract.

Returns:

The extracted value.

Throws:

HibernateException - Generally some form of mismatch error.

SQLException - Indicates problem making the JDBC call(s).

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set

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

Set a parameter value without worrying about the possibility of null values. Called from nullSafeSet(java.sql.PreparedStatement, java.lang.Object, int, boolean[], org.hibernate.engine.SessionImplementor) after nullness checks have been performed.

Parameters:

st - The statement into which to bind the parameter value.

value - The parameter value to bind.

index - The position or index at which to bind the param value.

Throws:

HibernateException - Generally some form of mismatch error.

SQLException - Indicates problem making the JDBC call(s).

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sqlType

public abstract int sqlType()

A convenience form of sqlTypes(org.hibernate.engine.Mapping), returning just a single type value since these are explicitly dealing with single column mappings.

Returns:

The Types mapping value.

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nullSafeToString

public String nullSafeToString(Object value)
                        throws HibernateException

A null-safe version of toString(Object). Specifically we are worried about null safeness in regards to the incoming value parameter, not the return.

Parameters:

value - The value to convert to a string representation; may be null.

Returns:

The string representation; may be null.

Throws:

HibernateException - Thrown by toString(Object), which this calls.

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toString

public abstract String toString(Object value)
                         throws HibernateException

Throws:

HibernateException

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fromStringValue

public abstract Object fromStringValue(String xml)
                                throws HibernateException

Throws:

HibernateException

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nullSafeSet

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

Throws:

HibernateException

SQLException

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nullSafeGet

public final 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 final Object nullSafeGet(ResultSet rs,
                                String[] names)
                         throws HibernateException,
                                SQLException

Throws:

HibernateException

SQLException

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nullSafeGet

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

Throws:

HibernateException

SQLException

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nullSafeGet

public final 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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toXMLString

public final String toXMLString(Object value,
                                SessionFactoryImplementor pc)
                         throws HibernateException

Throws:

HibernateException

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fromXMLString

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

Throws:

HibernateException

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getColumnSpan

public final int getColumnSpan(Mapping session)

Description copied from interface: Type

How many columns are used to persist this type.

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sqlTypes

public final int[] sqlTypes(Mapping session)

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

See Also:

Types

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isEqual

public final 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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isEqual

public boolean isEqual(Object x,
                       Object y)

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toLoggableString

public String toLoggableString(Object value,
                               SessionFactoryImplementor factory)

Description copied from interface: Type

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

Parameters:

value -

factory -

Returns:

String

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

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