org.datanucleus.store.rdbms.scostore
Class RDBMSJoinArrayStoreSpecialization

java.lang.Object
  org.datanucleus.store.mapped.scostore.BaseElementContainerStoreSpecialization
      org.datanucleus.store.rdbms.scostore.RDBMSJoinArrayStoreSpecialization

All Implemented Interfaces:

org.datanucleus.store.mapped.scostore.AbstractArrayStoreSpecialization, org.datanucleus.store.mapped.scostore.AbstractCollectionStoreSpecialization, org.datanucleus.store.mapped.scostore.ElementContainerStoreSpecialization, org.datanucleus.store.mapped.scostore.JoinArrayStoreSpecialization

public class RDBMSJoinArrayStoreSpecialization
extends org.datanucleus.store.mapped.scostore.BaseElementContainerStoreSpecialization
implements org.datanucleus.store.mapped.scostore.JoinArrayStoreSpecialization

RDBMS-specific implementation of a JoinArrayStoreSpecialization.

Field Summary

protected java.lang.String	addStmt Statement for adding an element to the container.
protected java.lang.String	clearStmt Statement for clearing the container.
protected java.lang.String	removeStmt Statement for removing an element from the container.
protected java.lang.String	sizeStmt Statement for getting the size of the container.
protected RDBMSManager	storeMgr
protected boolean	usingDiscriminatorInSizeStmt Whether we are using a discriminator in the "size" statement.

Fields inherited from class org.datanucleus.store.mapped.scostore.BaseElementContainerStoreSpecialization

clr, localiser

Method Summary

void	clear(org.datanucleus.StateManager ownerSM, org.datanucleus.store.mapped.scostore.ElementContainerStore ecs)
boolean	contains(org.datanucleus.StateManager sm, java.lang.Object element, org.datanucleus.store.mapped.scostore.AbstractCollectionStore acs)
void	executeClear(org.datanucleus.StateManager ownerSM, org.datanucleus.store.mapped.scostore.ElementContainerStore ecs)
protected java.lang.String	getAddStmt(org.datanucleus.store.mapped.scostore.ElementContainerStore ecs) Generates the statement for adding items.
protected java.lang.String	getClearStmt(org.datanucleus.store.mapped.scostore.ElementContainerStore ecs) Generate statement for clearing the container.
protected java.lang.String	getRemoveStmt(org.datanucleus.store.mapped.scostore.ElementContainerStore ecs) Generate statement for removing an element from the Collection.
int	getSize(org.datanucleus.StateManager ownerSM, org.datanucleus.store.mapped.scostore.ElementContainerStore ecs)
protected java.lang.String	getSizeStmt(org.datanucleus.store.mapped.scostore.ElementContainerStore ecs) Generate statement for getting the size of thecontainer.
protected java.lang.String	getUpdateEmbeddedElementStmt(org.datanucleus.store.mapped.mapping.JavaTypeMapping fieldMapping, org.datanucleus.store.mapped.scostore.ElementContainerStore acs) Generate statement for update the field of an embedded element.
int[]	internalAdd(org.datanucleus.StateManager sm, org.datanucleus.store.mapped.scostore.AbstractArrayStore aas, java.lang.Object element, org.datanucleus.ManagedConnection conn, boolean batched, int orderId, boolean executeNow) Internal method to add a row to the join table.
int[]	internalRemove(org.datanucleus.StateManager ownerSM, org.datanucleus.ManagedConnection conn, boolean batched, java.lang.Object element, boolean executeNow, org.datanucleus.store.mapped.scostore.AbstractCollectionStore acs)
protected void	invalidateAddStmt() Method to remove any stored statement for addition of an element.
void	processBatchedWrites(org.datanucleus.ManagedConnection mconn)
boolean	updateEmbeddedElement(org.datanucleus.StateManager sm, java.lang.Object element, int fieldNumber, java.lang.Object value, org.datanucleus.store.mapped.mapping.JavaTypeMapping fieldMapping, org.datanucleus.store.mapped.scostore.ElementContainerStore ecs)

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.datanucleus.store.mapped.scostore.AbstractArrayStoreSpecialization

clear, internalAdd, processBatchedWrites

Methods inherited from interface org.datanucleus.store.mapped.scostore.AbstractCollectionStoreSpecialization

contains, internalRemove, updateEmbeddedElement

Methods inherited from interface org.datanucleus.store.mapped.scostore.ElementContainerStoreSpecialization

executeClear, getSize

Field Detail

storeMgr

protected final RDBMSManager storeMgr

sizeStmt

protected java.lang.String sizeStmt

Statement for getting the size of the container.

clearStmt

protected java.lang.String clearStmt

Statement for clearing the container.

addStmt

protected java.lang.String addStmt

Statement for adding an element to the container.

removeStmt

protected java.lang.String removeStmt

Statement for removing an element from the container.

usingDiscriminatorInSizeStmt

protected boolean usingDiscriminatorInSizeStmt

Whether we are using a discriminator in the "size" statement.

Method Detail

clear

public void clear(org.datanucleus.StateManager ownerSM,
                  org.datanucleus.store.mapped.scostore.ElementContainerStore ecs)

Specified by:

clear in interface org.datanucleus.store.mapped.scostore.AbstractArrayStoreSpecialization

internalAdd

public int[] internalAdd(org.datanucleus.StateManager sm,
                         org.datanucleus.store.mapped.scostore.AbstractArrayStore aas,
                         java.lang.Object element,
                         org.datanucleus.ManagedConnection conn,
                         boolean batched,
                         int orderId,
                         boolean executeNow)
                  throws org.datanucleus.store.mapped.exceptions.MappedDatastoreException

Internal method to add a row to the join table. Used by add() and set() to add a row to the join table.

Specified by:

internalAdd in interface org.datanucleus.store.mapped.scostore.AbstractArrayStoreSpecialization

Parameters:

sm - StateManager for the owner of the collection

element - The element to add the relation to

conn - The connection

batched - Whether we are batching

orderId - The order id to use for this element relation

executeNow - Whether to execute the statement now (and not wait for any batch)

Returns:

Whether a row was inserted

Throws:

java.sql.SQLException - Thrown if an error occurs

org.datanucleus.store.mapped.exceptions.MappedDatastoreException

processBatchedWrites

public void processBatchedWrites(org.datanucleus.ManagedConnection mconn)
                          throws org.datanucleus.store.mapped.exceptions.MappedDatastoreException

Specified by:

processBatchedWrites in interface org.datanucleus.store.mapped.scostore.AbstractArrayStoreSpecialization

Throws:

org.datanucleus.store.mapped.exceptions.MappedDatastoreException

getUpdateEmbeddedElementStmt

protected java.lang.String getUpdateEmbeddedElementStmt(org.datanucleus.store.mapped.mapping.JavaTypeMapping fieldMapping,
                                                        org.datanucleus.store.mapped.scostore.ElementContainerStore acs)

Generate statement for update the field of an embedded element.

 UPDATE SETTABLE
 SET EMBEDDEDFIELD1 = ?
 WHERE OWNERCOL=?
 AND ELEMENTCOL = ?
 

Parameters:

fieldMapping - The mapping for the field within the embedded object to be updated

Returns:

Statement for updating an embedded element in the Set

updateEmbeddedElement

public boolean updateEmbeddedElement(org.datanucleus.StateManager sm,
                                     java.lang.Object element,
                                     int fieldNumber,
                                     java.lang.Object value,
                                     org.datanucleus.store.mapped.mapping.JavaTypeMapping fieldMapping,
                                     org.datanucleus.store.mapped.scostore.ElementContainerStore ecs)

Specified by:

updateEmbeddedElement in interface org.datanucleus.store.mapped.scostore.AbstractCollectionStoreSpecialization

contains

public boolean contains(org.datanucleus.StateManager sm,
                        java.lang.Object element,
                        org.datanucleus.store.mapped.scostore.AbstractCollectionStore acs)

Specified by:

contains in interface org.datanucleus.store.mapped.scostore.AbstractCollectionStoreSpecialization

internalRemove

public int[] internalRemove(org.datanucleus.StateManager ownerSM,
                            org.datanucleus.ManagedConnection conn,
                            boolean batched,
                            java.lang.Object element,
                            boolean executeNow,
                            org.datanucleus.store.mapped.scostore.AbstractCollectionStore acs)
                     throws org.datanucleus.store.mapped.exceptions.MappedDatastoreException

Specified by:

internalRemove in interface org.datanucleus.store.mapped.scostore.AbstractCollectionStoreSpecialization

Throws:

org.datanucleus.store.mapped.exceptions.MappedDatastoreException

getRemoveStmt

protected java.lang.String getRemoveStmt(org.datanucleus.store.mapped.scostore.ElementContainerStore ecs)

Generate statement for removing an element from the Collection.

 DELETE FROM COLLTABLE WHERE OWNERCOL=? AND ELEMENTCOL = ? [AND DISCRIM = ?]
 

Parameters:

ecs - Element container store

Returns:

Statement for deleting an item from the Collection.

invalidateAddStmt

protected void invalidateAddStmt()

Method to remove any stored statement for addition of an element.

getAddStmt

protected java.lang.String getAddStmt(org.datanucleus.store.mapped.scostore.ElementContainerStore ecs)

Generates the statement for adding items. The EMBEDDEDFIELDX columns are only added for embedded PC elements.

 INSERT INTO COLLTABLE (OWNERCOL,[ELEMENTCOL],[EMBEDDEDFIELD1, EMBEDDEDFIELD2,...],[ORDERCOL]) 
                       VALUES (?,?,?)
 

Returns:

The Statement for adding an item

executeClear

public void executeClear(org.datanucleus.StateManager ownerSM,
                         org.datanucleus.store.mapped.scostore.ElementContainerStore ecs)

getClearStmt

protected java.lang.String getClearStmt(org.datanucleus.store.mapped.scostore.ElementContainerStore ecs)

Generate statement for clearing the container.

 DELETE FROM CONTAINERTABLE WHERE OWNERCOL = ? [AND RELATION_DISCRIM=?]
 

TODO Add a discriminator restriction on this statement so we only clear ones with a valid discriminator value

Returns:

Statement for clearing the container.

getSize

public int getSize(org.datanucleus.StateManager ownerSM,
                   org.datanucleus.store.mapped.scostore.ElementContainerStore ecs)

getSizeStmt

protected java.lang.String getSizeStmt(org.datanucleus.store.mapped.scostore.ElementContainerStore ecs)

Generate statement for getting the size of thecontainer. The order part is only present when an order mapping is used. The discriminator part is only present when the element has a discriminator.

 SELECT COUNT(*) FROM TBL THIS
 [INNER JOIN ELEM_TBL ELEM ON TBL.COL = ELEM.ID] - when no null
 [LEFT OUTER JOIN ELEM_TBL ELEM ON TBL.COL = ELEM.ID] - when allows null
 WHERE THIS.OWNERCOL=?
 [AND THIS.ORDERCOL IS NOT NULL]
 [AND (DISCRIMINATOR=? OR DISCRMINATOR=? OR DISCRIMINATOR=? [OR DISCRIMINATOR IS NULL])]
 [AND RELATION_DISCRIM=?]
 

The discriminator part includes all subclasses of the element type. If the element is in a different table to the container then an INNER JOIN will be present to link the two tables, and table aliases will be present also. TODO Update this to allow for getting the size when more than 1 element table.

Returns:

The Statement returning the size of the container.