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

Field Summary
 
Fields inherited from class org.apache.cayenne.dba.JdbcPkGenerator
adapter, DEFAULT_PK_CACHE_SIZE, pkCache, pkCacheSize
 
Method Summary
protected  long longPkFromDatabase(DataNode node, DbEntity entity)
          Performs primary key generation ignoring cache.
 
Methods inherited from class org.apache.cayenne.dba.JdbcPkGenerator
autoPkTableExists, createAutoPk, createAutoPkStatements, dropAutoPk, dropAutoPkStatements, dropAutoPkString, generatePk, getAdapter, 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
 

Method Detail

longPkFromDatabase

protected long longPkFromDatabase(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:
longPkFromDatabase in class JdbcPkGenerator
Throws:
java.lang.Exception
Since:
3.0


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