Class BlobColumnMapping

java.lang.Object

org.datanucleus.store.rdbms.mapping.column.AbstractColumnMapping

org.datanucleus.store.rdbms.mapping.column.AbstractLargeBinaryColumnMapping

org.datanucleus.store.rdbms.mapping.column.BlobColumnMapping

All Implemented Interfaces:

ColumnMapping

public class BlobColumnMapping
extends AbstractLargeBinaryColumnMapping

Mapping of a BLOB column. 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 AbstractColumnMapping

column, mapping, storeMgr

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method	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 AbstractLargeBinaryColumnMapping

getObjectForBytes, initialize, setObject

Methods inherited from class AbstractColumnMapping

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 Object

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

Constructor Details

BlobColumnMapping

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

Constructor.

Parameters:

mapping - Java type mapping

storeMgr - Store Manager

col - Column

Method Details

getJDBCType

public int getJDBCType()

Description copied from class: AbstractColumnMapping

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

Specified by:

getJDBCType in class AbstractColumnMapping

Returns:

The JDBC "type"

getObject

public Object getObject(ResultSet rs,
 int param)

Description copied from class: AbstractLargeBinaryColumnMapping

Method to retrieve the object from the large binary column.

Specified by:

getObject in interface ColumnMapping

Overrides:

getObject in class AbstractLargeBinaryColumnMapping

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: AbstractLargeBinaryColumnMapping

Cater for serialisation of Strings.

Specified by:

setString in interface ColumnMapping

Overrides:

setString in class AbstractLargeBinaryColumnMapping

Parameters:

ps - PreparedStatement

param - param indexes

value - The value of the String

getString

public String getString(ResultSet rs,
 int param)

Description copied from class: AbstractLargeBinaryColumnMapping

Accessor for String value when serialised.

Specified by:

getString in interface ColumnMapping

Overrides:

getString in class AbstractLargeBinaryColumnMapping

Parameters:

rs - ResultSet

param - param indexes

Returns:

The String value