org.datanucleus.store.rdbms.mapping.datastore

Class BlobRDBMSMapping

java.lang.Object

org.datanucleus.store.rdbms.mapping.datastore.AbstractDatastoreMapping

org.datanucleus.store.rdbms.mapping.datastore.AbstractLargeBinaryRDBMSMapping

org.datanucleus.store.rdbms.mapping.datastore.BlobRDBMSMapping

All Implemented Interfaces:

DatastoreMapping

public class BlobRDBMSMapping
extends AbstractLargeBinaryRDBMSMapping

Mapping of a BLOB RDBMS type. A BLOB column can be treated in two ways in terms of storage and retrieval.

• Serialise the field into the BLOB using ObjectOutputStream, and deserialise it back using ObjectInputStream
• Store the field using a byte[] stream, and retrieve it in the same way.

Field Summary

Fields inherited from class org.datanucleus.store.rdbms.mapping.datastore.AbstractDatastoreMapping

column, mapping, storeMgr

Constructor Summary

Constructors

Constructor and Description
BlobRDBMSMapping(JavaTypeMapping mapping, RDBMSStoreManager storeMgr, Column col) Constructor.

Method Summary

Modifier and Type	Method and Description
int	getJDBCType() Method to return the java.sql.Types type that this relates to.
Object	getObject(ResultSet rs, int param) Method to retrieve the object from the large binary column.
String	getString(ResultSet rs, int param) Accessor for String value when serialised.
void	setString(PreparedStatement ps, int param, String value) Cater for serialisation of Strings.

Methods inherited from class org.datanucleus.store.rdbms.mapping.datastore.AbstractLargeBinaryRDBMSMapping

getObjectForBytes, initialize, setObject

Methods inherited from class org.datanucleus.store.rdbms.mapping.datastore.AbstractDatastoreMapping

equals, failureMessage, failureMessage, failureMessage, getBoolean, getByte, getChar, getColumn, getDatastoreAdapter, getDouble, getFloat, getInsertionInputParameter, getInt, getJavaTypeMapping, getLong, getShort, getTypeInfo, getUpdateInputParameter, hashCode, includeInFetchStatement, initTypeInfo, insertValuesOnInsert, isBitBased, isBooleanBased, isDecimalBased, isIntegerBased, isNullable, isStringBased, setBoolean, setByte, setChar, setDouble, setFloat, setInt, setLong, setShort, useDefaultWhenNull

Methods inherited from class java.lang.Object

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

Constructor Detail

BlobRDBMSMapping

public BlobRDBMSMapping(JavaTypeMapping mapping,
                        RDBMSStoreManager storeMgr,
                        Column col)

Constructor.

Parameters:

mapping - Java type mapping

storeMgr - Store Manager

col - Column

Method Detail

getJDBCType

public int getJDBCType()

Description copied from class: AbstractDatastoreMapping

Method to return the java.sql.Types type that this relates to.

Specified by:

getJDBCType in class AbstractDatastoreMapping

Returns:

The JDBC "type"

getObject

public Object getObject(ResultSet rs,
                        int param)

Description copied from class: AbstractLargeBinaryRDBMSMapping

Method to retrieve the object from the large binary column.

Specified by:

getObject in interface DatastoreMapping

Overrides:

getObject in class AbstractLargeBinaryRDBMSMapping

Parameters:

rs - The ResultSet

param - The parameter position

Returns:

The object

setString

public void setString(PreparedStatement ps,
                      int param,
                      String value)

Description copied from class: AbstractLargeBinaryRDBMSMapping

Cater for serialisation of Strings.

Specified by:

setString in interface DatastoreMapping

Overrides:

setString in class AbstractLargeBinaryRDBMSMapping

Parameters:

ps - PreparedStatement

param - param indexes

value - The value of the String

getString

public String getString(ResultSet rs,
                        int param)

Description copied from class: AbstractLargeBinaryRDBMSMapping

Accessor for String value when serialised.

Specified by:

getString in interface DatastoreMapping

Overrides:

getString in class AbstractLargeBinaryRDBMSMapping

Parameters:

rs - ResultSet

param - param indexes

Returns:

The String value