org.apache.cayenne.dba.derby
Class DerbyPkGenerator

java.lang.Object
  extended by org.apache.cayenne.dba.JdbcPkGenerator
      extended by org.apache.cayenne.dba.derby.DerbyPkGenerator
All Implemented Interfaces:
PkGenerator

public class DerbyPkGenerator
extends JdbcPkGenerator

Default PK generator for Derby that uses updateable ResultSet to get the next id from the lookup table.

Since:
1.2
Author:
Andrus Adamchik

Field Summary
 
Fields inherited from class org.apache.cayenne.dba.JdbcPkGenerator
DEFAULT_PK_CACHE_SIZE, NEXT_ID, objDesc, pkCache, pkCacheSize, resultDesc
 
Constructor Summary
DerbyPkGenerator()
           
 
Method Summary
protected  int pkFromDatabase(DataNode node, DbEntity entity)
          Performs primary key generation ignoring cache.
 
Methods inherited from class org.apache.cayenne.dba.JdbcPkGenerator
autoPkTableExists, binaryPK, createAutoPk, createAutoPkStatements, dropAutoPk, dropAutoPkStatements, dropAutoPkString, generatePkForDbEntity, generatePkForDbEntityString, getPkCacheSize, pkCreateString, pkDeleteString, pkSelectString, pkTableCreateString, pkUpdateString, reset, runUpdate, setPkCacheSize
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

DerbyPkGenerator

public DerbyPkGenerator()
Method Detail

pkFromDatabase

protected int pkFromDatabase(DataNode node,
                             DbEntity entity)
                      throws java.lang.Exception
Description copied from class: JdbcPkGenerator
Performs primary key generation ignoring cache. Generates a range of primary keys as specified by "pkCacheSize" bean property.

This method is called internally from "generatePkForDbEntity" and then generated range of key values is saved in cache for performance. Subclasses that implement different primary key generation solutions should override this method, not "generatePkForDbEntity".

Overrides:
pkFromDatabase in class JdbcPkGenerator
Throws:
java.lang.Exception


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