org.datanucleus.store.rdbms.scostore
Class RDBMSPersistableRelationStore

java.lang.Object
  org.datanucleus.store.rdbms.scostore.RDBMSPersistableRelationStore

All Implemented Interfaces:

org.datanucleus.store.scostore.PersistableRelationStore, org.datanucleus.store.scostore.Store

public class RDBMSPersistableRelationStore
extends Object
implements org.datanucleus.store.scostore.PersistableRelationStore

RDBMS implementation of a persistable relation backing store. Represents an N-1 unidirectional join table relation, and manages the access to the join table.

Field Summary

protected String	addStmt Statement for adding a relation to the join table.
protected org.datanucleus.ClassLoaderResolver	clr ClassLoader resolver.
protected org.datanucleus.store.mapped.DatastoreAdapter	dba Datastore adapter in use by this store.
protected PersistableJoinTable	joinTable Table containing the link between owner and related object.
protected org.datanucleus.store.mapped.mapping.JavaTypeMapping	ownerMapping Mapping to the owner of the relation (which holds the member).
protected org.datanucleus.metadata.AbstractMemberMetaData	ownerMemberMetaData MetaData for the member in the owner.
protected String	removeStmt Statement for removing a relation from the join table.
protected RDBMSStoreManager	storeMgr Manager for the store.
protected String	updateStmt Statement for updating a relation to the join table.

Constructor Summary

RDBMSPersistableRelationStore(org.datanucleus.metadata.AbstractMemberMetaData mmd, PersistableJoinTable joinTable, org.datanucleus.ClassLoaderResolver clr)
Constructor for a persistable relation join store for RDBMS.

Method Summary

boolean	add(org.datanucleus.store.ObjectProvider sm1, org.datanucleus.store.ObjectProvider sm2)
protected String	getAddStmt() Generates the statement for adding items.
protected String	getRemoveStmt() Generates the statement for removing items.
org.datanucleus.store.StoreManager	getStoreManager()
protected String	getUpdateStmt() Generates the statement for updating items.
static int	populateOwnerInStatement(org.datanucleus.store.ObjectProvider sm, org.datanucleus.store.ExecutionContext ec, Object ps, int jdbcPosition, PersistableJoinTable joinTable) Convenience method to populate the passed PreparedStatement with the value from the owner.
boolean	remove(org.datanucleus.store.ObjectProvider sm1)
boolean	update(org.datanucleus.store.ObjectProvider sm1, org.datanucleus.store.ObjectProvider sm2)

Methods inherited from class java.lang.Object

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

Field Detail

storeMgr

protected RDBMSStoreManager storeMgr

Manager for the store.

dba

protected org.datanucleus.store.mapped.DatastoreAdapter dba

Datastore adapter in use by this store.

ownerMapping

protected org.datanucleus.store.mapped.mapping.JavaTypeMapping ownerMapping

Mapping to the owner of the relation (which holds the member).

ownerMemberMetaData

protected org.datanucleus.metadata.AbstractMemberMetaData ownerMemberMetaData

MetaData for the member in the owner.

joinTable

protected PersistableJoinTable joinTable

Table containing the link between owner and related object.

clr

protected org.datanucleus.ClassLoaderResolver clr

ClassLoader resolver.

addStmt

protected String addStmt

Statement for adding a relation to the join table.

updateStmt

protected String updateStmt

Statement for updating a relation to the join table.

removeStmt

protected String removeStmt

Statement for removing a relation from the join table.

Constructor Detail

RDBMSPersistableRelationStore

public RDBMSPersistableRelationStore(org.datanucleus.metadata.AbstractMemberMetaData mmd,
                                     PersistableJoinTable joinTable,
                                     org.datanucleus.ClassLoaderResolver clr)

Constructor for a persistable relation join store for RDBMS.

Parameters:

mmd - owner member metadata

joinTable - The join table

clr - The ClassLoaderResolver

Method Detail

getStoreManager

public org.datanucleus.store.StoreManager getStoreManager()

Specified by:

getStoreManager in interface org.datanucleus.store.scostore.Store

add

public boolean add(org.datanucleus.store.ObjectProvider sm1,
                   org.datanucleus.store.ObjectProvider sm2)

Specified by:

add in interface org.datanucleus.store.scostore.PersistableRelationStore

remove

public boolean remove(org.datanucleus.store.ObjectProvider sm1)

Specified by:

remove in interface org.datanucleus.store.scostore.PersistableRelationStore

update

public boolean update(org.datanucleus.store.ObjectProvider sm1,
                      org.datanucleus.store.ObjectProvider sm2)

Specified by:

update in interface org.datanucleus.store.scostore.PersistableRelationStore

getAddStmt

protected String getAddStmt()

Generates the statement for adding items.

 INSERT INTO JOINTABLE (OWNER_COL, RELATED_COL) VALUES (?,?)
 

Returns:

The Statement for adding an item

getUpdateStmt

protected String getUpdateStmt()

Generates the statement for updating items.

 UPDATE JOINTABLE SET RELATED_COL = ? WHERE OWNER_COL = ?
 

Returns:

The Statement for updating an item

getRemoveStmt

protected String getRemoveStmt()

Generates the statement for removing items.

 DELETE FROM JOINTABLE WHERE OWNER_COL = ?
 

Returns:

The Statement for removing an item

populateOwnerInStatement

public static int populateOwnerInStatement(org.datanucleus.store.ObjectProvider sm,
                                           org.datanucleus.store.ExecutionContext ec,
                                           Object ps,
                                           int jdbcPosition,
                                           PersistableJoinTable joinTable)

Convenience method to populate the passed PreparedStatement with the value from the owner.

Parameters:

sm - State Manager

ec - execution context

ps - The PreparedStatement

jdbcPosition - Position in JDBC statement to populate

joinTable - Join table

Returns:

The next position in the JDBC statement