er.extensions.eof

Class ERXLongPrimaryKeyFactory

java.lang.Object

er.extensions.eof.ERXLongPrimaryKeyFactory

public class ERXLongPrimaryKeyFactory
extends Object

Automatically generates Long primary keys for entities. Features a cache which reduces database roundtrips as well as optionally encoding Entity type in PK value.

Usage:

override either the ERXGeneratesPrimaryKey interface like this:

 private NSDictionary _primaryKeyDictionary = null;
 
 public NSDictionary primaryKeyDictionary(boolean inTransaction) {
                if (_primaryKeyDictionary == null) {
                        _primaryKeyDictionary = ERXLongPrimaryKeyFactory.primaryKeyDictionary(this);
                }
                return _primaryKeyDictionary;
 }
 

or manually call
ERXLongPrimaryKeyFactory.primaryKeyDictionary(EOEnterpriseObject eo); the necessary database table is generated on the fly.

Encoding Entity in PK values

If the system property ERXIntegerPrimaryKeyFactory.encodeEntityInPkValue is set to true then the last 6 bits from the 64 bit primary key is used to encode the Subentity in the pk value. This speeds up inheritance with multiple tables. In order to support this you must add an entry to the userInfo from the Subentities:

key=entityCode
value= %lt;%lt; an unique integer, no longer than 6 bit - 1

Author:

david@cluster9.com

Constructor Summary

Constructors

Constructor and Description
ERXLongPrimaryKeyFactory()

Method Summary

Modifier and Type	Method and Description
static NSDictionary	primaryKeyDictionary(com.webobjects.eocontrol.EOEnterpriseObject eo)
static Object	primaryKeyValue(String entityName)
com.webobjects.eoaccess.EOEntity	subEntityForEntity(com.webobjects.eoaccess.EOEntity entity, NSDictionary pkDict)

Methods inherited from class java.lang.Object

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

Constructor Detail

ERXLongPrimaryKeyFactory

public ERXLongPrimaryKeyFactory()

Method Detail

subEntityForEntity

public com.webobjects.eoaccess.EOEntity subEntityForEntity(com.webobjects.eoaccess.EOEntity entity,
                                                           NSDictionary pkDict)

primaryKeyValue

public static Object primaryKeyValue(String entityName)

primaryKeyDictionary

public static NSDictionary primaryKeyDictionary(com.webobjects.eocontrol.EOEnterpriseObject eo)