org.datanucleus.store.rdbms
Class RDBMSStoreHelper

java.lang.Object
  org.datanucleus.store.rdbms.RDBMSStoreHelper

public class RDBMSStoreHelper
extends java.lang.Object

Provides a series of utilities assisting in the datastore management process for RDBMS datastores.

Constructor Summary

RDBMSStoreHelper()

Method Summary

static java.lang.String	getClassNameForIdUsingDiscriminator(RDBMSStoreManager storeMgr, org.datanucleus.store.ExecutionContext ec, java.lang.Object id, org.datanucleus.metadata.AbstractClassMetaData cmd) Utility that does a discriminator candidate query for the specified candidate and subclasses and returns the class name of the instance that has the specified identity (if any).
static java.lang.String	getClassNameForIdUsingUnion(RDBMSStoreManager storeMgr, org.datanucleus.store.ExecutionContext ec, java.lang.Object id, java.util.List<org.datanucleus.metadata.AbstractClassMetaData> rootCmds) Utility that does a union candidate query for the specified candidate(s) and subclasses and returns the class name of the instance that has the specified identity (if any).

Methods inherited from class java.lang.Object

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

Constructor Detail

RDBMSStoreHelper

public RDBMSStoreHelper()

Method Detail

getClassNameForIdUsingDiscriminator

public static java.lang.String getClassNameForIdUsingDiscriminator(RDBMSStoreManager storeMgr,
                                                                   org.datanucleus.store.ExecutionContext ec,
                                                                   java.lang.Object id,
                                                                   org.datanucleus.metadata.AbstractClassMetaData cmd)

Utility that does a discriminator candidate query for the specified candidate and subclasses and returns the class name of the instance that has the specified identity (if any).

Parameters:

storeMgr - RDBMS StoreManager

ec - execution context

id - The id

cmd - Metadata for the root candidate class

Returns:

Name of the class with this identity (or null if none found)

getClassNameForIdUsingUnion

public static java.lang.String getClassNameForIdUsingUnion(RDBMSStoreManager storeMgr,
                                                           org.datanucleus.store.ExecutionContext ec,
                                                           java.lang.Object id,
                                                           java.util.List<org.datanucleus.metadata.AbstractClassMetaData> rootCmds)

Utility that does a union candidate query for the specified candidate(s) and subclasses and returns the class name of the instance that has the specified identity (if any).

Parameters:

storeMgr - RDBMS StoreManager

ec - execution context

id - The id

rootCmds - Metadata for the classes at the root

Returns:

Name of the class with this identity (or null if none found)