org.datanucleus.store.rdbms.mapping.datastore

Class AbstractLargeBinaryRDBMSMapping

java.lang.Object

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

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

All Implemented Interfaces:

DatastoreMapping

Direct Known Subclasses:

BlobRDBMSMapping, LongVarBinaryRDBMSMapping, VarBinaryRDBMSMapping

public abstract class AbstractLargeBinaryRDBMSMapping
extends AbstractDatastoreMapping

Mapping of a large binary (e.g BLOB, LONGVARBINARY) RDBMS type. 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.datastore.AbstractDatastoreMapping

column, mapping, storeMgr

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method and 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.datastore.AbstractDatastoreMapping

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

Methods inherited from class java.lang.Object

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

Constructor Detail

AbstractLargeBinaryRDBMSMapping

public AbstractLargeBinaryRDBMSMapping(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 DatastoreMapping

Overrides:

setObject in class AbstractDatastoreMapping

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 DatastoreMapping

Overrides:

getObject in class AbstractDatastoreMapping

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 DatastoreMapping

Overrides:

setString in class AbstractDatastoreMapping

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 DatastoreMapping

Overrides:

getString in class AbstractDatastoreMapping

Parameters:

resultSet - ResultSet

exprIndex - param indexes

Returns:

The String value