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AbstractLobType (Spring Framework API 2.1) - Spring Framework 2.1.0 API 文档英文版

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org.springframework.orm.hibernate3.support
Class AbstractLobType

java.lang.Object
  org.springframework.orm.hibernate3.support.AbstractLobType

All Implemented Interfaces:

UserType

Direct Known Subclasses:

BlobByteArrayType, BlobSerializableType, BlobStringType, ClobStringType

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public abstract class AbstractLobType
extends Object
implements UserType

Abstract base class for Hibernate UserType implementations that map to LOBs. Retrieves the LobHandler to use from LocalSessionFactoryBean at config time.

For writing LOBs, either an active Spring transaction synchronization or an active JTA transaction (with "jtaTransactionManager" specified on LocalSessionFactoryBean or a Hibernate TransactionManagerLookup configured through the corresponding Hibernate property) is required.

Offers template methods for setting parameters and getting result values, passing in the LobHandler or LobCreator to use.

Since:

1.2

Author:

Juergen Hoeller

See Also:

LobHandler, LobCreator, LocalSessionFactoryBean.setLobHandler(org.springframework.jdbc.support.lob.LobHandler), LocalSessionFactoryBean.setJtaTransactionManager(javax.transaction.TransactionManager)

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Field Summary
protected  Log	logger

 

Constructor Summary
protected	AbstractLobType()           Constructor used by Hibernate: fetches config-time LobHandler and config-time JTA TransactionManager from LocalSessionFactoryBean.
protected	AbstractLobType(LobHandler lobHandler, TransactionManager jtaTransactionManager)           Constructor used for testing: takes an explicit LobHandler and an explicit JTA TransactionManager (can be null).

 

Method Summary
Object	assemble(Serializable cached, Object owner)           This implementation returns the passed-in value as-is.
Object	deepCopy(Object value)           This implementation returns the passed-in value as-is.
Serializable	disassemble(Object value)           This implementation returns the passed-in value as-is.
boolean	equals(Object x, Object y)           This implementation delegates to the Hibernate EqualsHelper.
int	hashCode(Object x)           This implementation returns the hashCode of the given objectz.
boolean	isMutable()           This implementation returns false.
Object	nullSafeGet(ResultSet rs, String[] names, Object owner)           This implementation delegates to nullSafeGetInternal, passing in the LobHandler of this type.
protected abstract  Object	nullSafeGetInternal(ResultSet rs, String[] names, Object owner, LobHandler lobHandler)           Template method to extract a value from the given result set.
void	nullSafeSet(PreparedStatement st, Object value, int index)           This implementation delegates to nullSafeSetInternal, passing in a transaction-synchronized LobCreator for the LobHandler of this type.
protected abstract  void	nullSafeSetInternal(PreparedStatement ps, int index, Object value, LobCreator lobCreator)           Template method to set the given parameter value on the given statement.
Object	replace(Object original, Object target, Object owner)           This implementation returns the passed-in original as-is.

 

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

 

Methods inherited from interface org.hibernate.usertype.UserType
returnedClass, sqlTypes

 

Field Detail

logger

protected final Log logger

Constructor Detail

AbstractLobType

protected AbstractLobType()

Constructor used by Hibernate: fetches config-time LobHandler and config-time JTA TransactionManager from LocalSessionFactoryBean.

See Also:

LocalSessionFactoryBean.getConfigTimeLobHandler(), LocalSessionFactoryBean.getConfigTimeTransactionManager()

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AbstractLobType

protected AbstractLobType(LobHandler lobHandler,
                          TransactionManager jtaTransactionManager)

Constructor used for testing: takes an explicit LobHandler and an explicit JTA TransactionManager (can be null).

Method Detail

isMutable

public boolean isMutable()

This implementation returns false.

Specified by:

isMutable in interface UserType

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equals

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

This implementation delegates to the Hibernate EqualsHelper.

Specified by:

equals in interface UserType

Throws:

HibernateException

See Also:

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

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hashCode

public int hashCode(Object x)
             throws HibernateException

This implementation returns the hashCode of the given objectz.

Specified by:

hashCode in interface UserType

Throws:

HibernateException

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deepCopy

public Object deepCopy(Object value)
                throws HibernateException

This implementation returns the passed-in value as-is.

Specified by:

deepCopy in interface UserType

Throws:

HibernateException

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disassemble

public Serializable disassemble(Object value)
                         throws HibernateException

This implementation returns the passed-in value as-is.

Specified by:

disassemble in interface UserType

Throws:

HibernateException

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assemble

public Object assemble(Serializable cached,
                       Object owner)
                throws HibernateException

This implementation returns the passed-in value as-is.

Specified by:

assemble in interface UserType

Throws:

HibernateException

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replace

public Object replace(Object original,
                      Object target,
                      Object owner)
               throws HibernateException

This implementation returns the passed-in original as-is.

Specified by:

replace in interface UserType

Throws:

HibernateException

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nullSafeGet

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

This implementation delegates to nullSafeGetInternal, passing in the LobHandler of this type.

Specified by:

nullSafeGet in interface UserType

Throws:

HibernateException

SQLException

See Also:

nullSafeGetInternal(java.sql.ResultSet, java.lang.String[], java.lang.Object, org.springframework.jdbc.support.lob.LobHandler)

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nullSafeSet

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

This implementation delegates to nullSafeSetInternal, passing in a transaction-synchronized LobCreator for the LobHandler of this type.

Specified by:

nullSafeSet in interface UserType

Throws:

HibernateException

SQLException

See Also:

nullSafeSetInternal(java.sql.PreparedStatement, int, java.lang.Object, org.springframework.jdbc.support.lob.LobCreator)

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nullSafeGetInternal

protected abstract Object nullSafeGetInternal(ResultSet rs,
                                              String[] names,
                                              Object owner,
                                              LobHandler lobHandler)
                                       throws SQLException,
                                              IOException,
                                              HibernateException

Template method to extract a value from the given result set.

Parameters:

rs - the ResultSet to extract from

names - the column names

owner - the containing entity

lobHandler - the LobHandler to use

Returns:

the extracted value

Throws:

SQLException - if thrown by JDBC methods

IOException - if thrown by streaming methods

HibernateException - in case of any other exceptions

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nullSafeSetInternal

protected abstract void nullSafeSetInternal(PreparedStatement ps,
                                            int index,
                                            Object value,
                                            LobCreator lobCreator)
                                     throws SQLException,
                                            IOException,
                                            HibernateException

Template method to set the given parameter value on the given statement.

Parameters:

ps - the PreparedStatement to set on

index - the statement parameter index

value - the value to set

lobCreator - the LobCreator to use

Throws:

SQLException - if thrown by JDBC methods

IOException - if thrown by streaming methods

HibernateException - in case of any other exceptions

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