Package org.datanucleus.store.rdbms.mapping.column

Class AbstractLargeBinaryColumnMapping

java.lang.Object

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

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

All Implemented Interfaces:

ColumnMapping

Direct Known Subclasses:

BinaryColumnMapping, BlobColumnMapping, LongVarBinaryColumnMapping, VarBinaryColumnMapping

public abstract class AbstractLargeBinaryColumnMapping
extends AbstractColumnMapping

Mapping of a large binary (e.g BLOB, LONGVARBINARY) column. A large binary column can be treated in two ways in terms of storage and retrieval.

• Serialise the field into the large binary using ObjectOutputStream, and deserialise it back using ObjectInputStream - i.e Java serialisation
• 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.column.AbstractColumnMapping

column, mapping, storeMgr

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method	Description
Object	getObject(ResultSet rs, int param)	Method to retrieve the object from the large binary column.
protected Object	getObjectForBytes(byte[] bytes, int param)
String	getString(ResultSet resultSet, int exprIndex)	Accessor for String value when serialised.
protected void	initialize()	Initialisation method, initialising the type info.
void	setObject(PreparedStatement ps, int param, Object value)	Method to store a field into a "large varbinary" column.
void	setString(PreparedStatement ps, int exprIndex, String value)	Cater for serialisation of Strings.

Methods inherited from class org.datanucleus.store.rdbms.mapping.column.AbstractColumnMapping

equals, failureMessage, failureMessage, failureMessage, getBoolean, getByte, getChar, getColumn, getDatastoreAdapter, getDouble, getFloat, getInsertionInputParameter, getInt, getJavaTypeMapping, getJDBCType, 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

AbstractLargeBinaryColumnMapping

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

Constructor.

Parameters:

mapping - Java type mapping

storeMgr - Store Manager

col - Column

Method Detail

initialize

protected void initialize()

Initialisation method, initialising the type info.

setObject

public void setObject(PreparedStatement ps,
                      int param,
                      Object value)

Method to store a field into a "large varbinary" column.

Specified by:

setObject in interface ColumnMapping

Overrides:

setObject in class AbstractColumnMapping

Parameters:

ps - The PreparedStatement

param - Parameter position in the statement

value - The value to store

getObjectForBytes

protected Object getObjectForBytes(byte[] bytes,
                                   int param)

getObject

public Object getObject(ResultSet rs,
                        int param)

Method to retrieve the object from the large binary column.

Specified by:

getObject in interface ColumnMapping

Overrides:

getObject in class AbstractColumnMapping

Parameters:

rs - The ResultSet

param - The parameter position

Returns:

The object

setString

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

Cater for serialisation of Strings.

Specified by:

setString in interface ColumnMapping

Overrides:

setString in class AbstractColumnMapping

Parameters:

ps - PreparedStatement

exprIndex - param indexes

value - The value of the String

getString

public String getString(ResultSet resultSet,
                        int exprIndex)

Accessor for String value when serialised.

Specified by:

getString in interface ColumnMapping

Overrides:

getString in class AbstractColumnMapping

Parameters:

resultSet - ResultSet

exprIndex - param indexes

Returns:

The String value