org.springframework.orm.jdo
Class DefaultJdoDialect

java.lang.Object
  extended by org.springframework.orm.jdo.DefaultJdoDialect
All Implemented Interfaces:
JdoDialect

public class DefaultJdoDialect
extends Object
implements JdoDialect

Default implementation of the JdoDialect interface. Updated to leverage the JDO 2.0 API when available, as of Spring 1.2. Used as default dialect by JdoAccessor and JdoTransactionManager.

Simply begins a standard JDO transaction in beginTransaction. Returns a handle for a JDO2 DataStoreConnection on getJdbcConnection. Calls the corresponding JDO2 operations on detachCopy(All), attachCopy(All), flush and newNamedQuery. Ignores a given query timeout in applyQueryTimeout. Uses a Spring SQLExceptionTranslator for exception translation, if applicable.

Note that, even with JDO2, vendor-specific subclasses are still necessary for special transaction semantics and more sophisticated exception translation. Furthermore, vendor-specific subclasses are encouraged to expose the native JDBC Connection on getJdbcConnection, rather than JDO2's wrapper handle.

Since:
1.1
Author:
Juergen Hoeller
See Also:
setJdbcExceptionTranslator(org.springframework.jdbc.support.SQLExceptionTranslator), JdoAccessor.setJdoDialect(org.springframework.orm.jdo.JdoDialect), JdoTransactionManager.setJdoDialect(org.springframework.orm.jdo.JdoDialect)

Field Summary
protected  Log logger
           
 
Constructor Summary
DefaultJdoDialect()
          Create a new DefaultJdoDialect.
DefaultJdoDialect(javax.jdo.PersistenceManagerFactory pmf)
          Create a new DefaultJdoDialect.
 
Method Summary
 void applyQueryTimeout(javax.jdo.Query query, int remainingTimeInSeconds)
          This implementation logs a warning that it cannot apply a query timeout.
 Object attachCopy(javax.jdo.PersistenceManager pm, Object detachedEntity)
          This implementation delegates to JDO 2.0's attachCopy method, passing in "true" for the "makeTransactional" argument.
 Collection attachCopyAll(javax.jdo.PersistenceManager pm, Collection detachedEntities)
          This implementation delegates to JDO 2.0's attachCopyAll method, passing in "true" for the "makeTransactional" argument.
 Object beginTransaction(javax.jdo.Transaction transaction, TransactionDefinition definition)
          This implementation invokes the standard JDO Transaction.begin method.
 void cleanupTransaction(Object transactionData)
          This implementation does nothing, as the default beginTransaction implementation does not require any cleanup.
 Object detachCopy(javax.jdo.PersistenceManager pm, Object entity)
          This implementation delegates to JDO 2.0's detachCopy method.
 Collection detachCopyAll(javax.jdo.PersistenceManager pm, Collection entities)
          This implementation delegates to JDO 2.0's detachCopyAll method.
protected  String extractSqlStringFromException(javax.jdo.JDOException ex)
          Template method for extracting a SQL String from the given exception.
 void flush(javax.jdo.PersistenceManager pm)
          This implementation delegates to JDO 2.0's flush method.
 ConnectionHandle getJdbcConnection(javax.jdo.PersistenceManager pm, boolean readOnly)
          This implementation returns a DataStoreConnectionHandle for JDO2, which will also work on JDO1 until actually accessing the JDBC Connection.
 SQLExceptionTranslator getJdbcExceptionTranslator()
          Return the JDBC exception translator for this instance.
 javax.jdo.PersistenceManagerFactory getPersistenceManagerFactory()
          Return the JDO PersistenceManagerFactory that should be used to create PersistenceManagers.
 javax.jdo.Query newNamedQuery(javax.jdo.PersistenceManager pm, Class entityClass, String queryName)
          This implementation delegates to JDO 2.0's newNamedQuery method.
 void releaseJdbcConnection(ConnectionHandle conHandle, javax.jdo.PersistenceManager pm)
          This implementation does nothing, assuming that the Connection will implicitly be closed with the PersistenceManager.
 void setJdbcExceptionTranslator(SQLExceptionTranslator jdbcExceptionTranslator)
          Set the JDBC exception translator for this dialect.
 void setPersistenceManagerFactory(javax.jdo.PersistenceManagerFactory pmf)
          Set the JDO PersistenceManagerFactory, which is used to initialize the default JDBC exception translator if none specified.
 DataAccessException translateException(javax.jdo.JDOException ex)
          This implementation delegates to PersistenceManagerFactoryUtils.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

logger

protected Log logger
Constructor Detail

DefaultJdoDialect

public DefaultJdoDialect()
Create a new DefaultJdoDialect.


DefaultJdoDialect

public DefaultJdoDialect(javax.jdo.PersistenceManagerFactory pmf)
Create a new DefaultJdoDialect.

Parameters:
pmf - the JDO PersistenceManagerFactory, which is used to initialize the default JDBC exception translator
Method Detail

setPersistenceManagerFactory

public void setPersistenceManagerFactory(javax.jdo.PersistenceManagerFactory pmf)
Set the JDO PersistenceManagerFactory, which is used to initialize the default JDBC exception translator if none specified.

See Also:
setJdbcExceptionTranslator(org.springframework.jdbc.support.SQLExceptionTranslator)

getPersistenceManagerFactory

public javax.jdo.PersistenceManagerFactory getPersistenceManagerFactory()
Return the JDO PersistenceManagerFactory that should be used to create PersistenceManagers.


setJdbcExceptionTranslator

public void setJdbcExceptionTranslator(SQLExceptionTranslator jdbcExceptionTranslator)
Set the JDBC exception translator for this dialect. Applied to SQLExceptions that are the cause of JDOExceptions.

The default exception translator is either a SQLErrorCodeSQLExceptionTranslator if a DataSource is available, or a SQLStateSQLExceptionTranslator else.

Parameters:
jdbcExceptionTranslator - exception translator
See Also:
SQLException, JDOException.getCause(), PersistenceManagerFactoryUtils.newJdbcExceptionTranslator(javax.jdo.PersistenceManagerFactory), SQLErrorCodeSQLExceptionTranslator, SQLStateSQLExceptionTranslator

getJdbcExceptionTranslator

public SQLExceptionTranslator getJdbcExceptionTranslator()
Return the JDBC exception translator for this instance.

Creates a default SQLErrorCodeSQLExceptionTranslator or SQLStateSQLExceptionTranslator for the specified PersistenceManagerFactory, if no exception translator explicitly specified.


beginTransaction

public Object beginTransaction(javax.jdo.Transaction transaction,
                               TransactionDefinition definition)
                        throws javax.jdo.JDOException,
                               SQLException,
                               TransactionException
This implementation invokes the standard JDO Transaction.begin method. Throws an InvalidIsolationLevelException if a non-default isolation level is set.

Specified by:
beginTransaction in interface JdoDialect
Parameters:
transaction - the JDO transaction to begin
definition - the Spring transaction definition that defines semantics
Returns:
an arbitrary object that holds transaction data, if any (to be passed into cleanupTransaction)
Throws:
javax.jdo.JDOException - if thrown by JDO methods
SQLException - if thrown by JDBC methods
TransactionException - in case of invalid arguments
See Also:
Transaction.begin(), InvalidIsolationLevelException

cleanupTransaction

public void cleanupTransaction(Object transactionData)
This implementation does nothing, as the default beginTransaction implementation does not require any cleanup.

Specified by:
cleanupTransaction in interface JdoDialect
Parameters:
transactionData - arbitrary object that holds transaction data, if any (as returned by beginTransaction)
See Also:
beginTransaction(javax.jdo.Transaction, org.springframework.transaction.TransactionDefinition)

getJdbcConnection

public ConnectionHandle getJdbcConnection(javax.jdo.PersistenceManager pm,
                                          boolean readOnly)
                                   throws javax.jdo.JDOException,
                                          SQLException
This implementation returns a DataStoreConnectionHandle for JDO2, which will also work on JDO1 until actually accessing the JDBC Connection.

For pre-JDO2 implementations, override this method to return the Connection through the corresponding vendor-specific mechanism, or null if the Connection is not retrievable.

NOTE: A JDO2 DataStoreConnection is always a wrapper, never the native JDBC Connection. If you need access to the native JDBC Connection (or the connection pool handle, to be unwrapped via a Spring NativeJdbcExtractor), override this method to return the native Connection through the corresponding vendor-specific mechanism.

A JDO2 DataStoreConnection is only "borrowed" from the PersistenceManager: it needs to be returned as early as possible. Effectively, JDO2 requires the fetched Connection to be closed before continuing PersistenceManager work. For this reason, the exposed ConnectionHandle eagerly releases its JDBC Connection at the end of each JDBC data access operation (that is, on DataSourceUtils.releaseConnection).

Specified by:
getJdbcConnection in interface JdoDialect
Parameters:
pm - the current JDO PersistenceManager
Returns:
a handle for the JDBC Connection, to be passed into releaseJdbcConnection, or null if no JDBC Connection can be retrieved
Throws:
javax.jdo.JDOException - if thrown by JDO methods
SQLException - if thrown by JDBC methods
See Also:
PersistenceManager.getDataStoreConnection(), NativeJdbcExtractor, DataSourceUtils.releaseConnection(java.sql.Connection, javax.sql.DataSource)

releaseJdbcConnection

public void releaseJdbcConnection(ConnectionHandle conHandle,
                                  javax.jdo.PersistenceManager pm)
                           throws javax.jdo.JDOException,
                                  SQLException
This implementation does nothing, assuming that the Connection will implicitly be closed with the PersistenceManager.

If the JDO provider returns a Connection handle that it expects the application to close, the dialect needs to invoke Connection.close here.

Specified by:
releaseJdbcConnection in interface JdoDialect
Parameters:
conHandle - the JDBC Connection handle to release
pm - the current JDO PersistenceManager
Throws:
javax.jdo.JDOException - if thrown by JDO methods
SQLException - if thrown by JDBC methods
See Also:
Connection.close()

detachCopy

public Object detachCopy(javax.jdo.PersistenceManager pm,
                         Object entity)
                  throws javax.jdo.JDOException
This implementation delegates to JDO 2.0's detachCopy method.

To be overridden for pre-JDO2 implementations, using the corresponding vendor-specific mechanism there.

Specified by:
detachCopy in interface JdoDialect
Parameters:
pm - the current JDO PersistenceManager
entity - the persistent instance to detach
Throws:
javax.jdo.JDOException - in case of errors
See Also:
PersistenceManager.detachCopy(Object)

detachCopyAll

public Collection detachCopyAll(javax.jdo.PersistenceManager pm,
                                Collection entities)
                         throws javax.jdo.JDOException
This implementation delegates to JDO 2.0's detachCopyAll method.

To be overridden for pre-JDO2 implementations, using the corresponding vendor-specific mechanism there.

Specified by:
detachCopyAll in interface JdoDialect
Parameters:
pm - the current JDO PersistenceManager
entities - the persistent instances to detach
Throws:
javax.jdo.JDOException - in case of errors
See Also:
PersistenceManager.detachCopyAll(java.util.Collection)

attachCopy

public Object attachCopy(javax.jdo.PersistenceManager pm,
                         Object detachedEntity)
                  throws javax.jdo.JDOException
This implementation delegates to JDO 2.0's attachCopy method, passing in "true" for the "makeTransactional" argument.

To be overridden for pre-JDO2 implementations, using the corresponding vendor-specific mechanism there.

Specified by:
attachCopy in interface JdoDialect
Parameters:
pm - the current JDO PersistenceManager
detachedEntity - the detached instance to attach
Returns:
the corresponding persistent instance
Throws:
javax.jdo.JDOException - in case of errors
See Also:
PersistenceManager.attachCopy(Object, boolean)

attachCopyAll

public Collection attachCopyAll(javax.jdo.PersistenceManager pm,
                                Collection detachedEntities)
                         throws javax.jdo.JDOException
This implementation delegates to JDO 2.0's attachCopyAll method, passing in "true" for the "makeTransactional" argument.

To be overridden for pre-JDO2 implementations, using the corresponding vendor-specific mechanism there.

Specified by:
attachCopyAll in interface JdoDialect
Parameters:
pm - the current JDO PersistenceManager
detachedEntities - the detached instances to reattach
Returns:
the corresponding persistent instances
Throws:
javax.jdo.JDOException - in case of errors
See Also:
PersistenceManager.attachCopyAll(java.util.Collection, boolean)

flush

public void flush(javax.jdo.PersistenceManager pm)
           throws javax.jdo.JDOException
This implementation delegates to JDO 2.0's flush method.

To be overridden for pre-JDO2 implementations, using the corresponding vendor-specific mechanism there.

Specified by:
flush in interface JdoDialect
Parameters:
pm - the current JDO PersistenceManager
Throws:
javax.jdo.JDOException - in case of errors
See Also:
PersistenceManager.flush()

newNamedQuery

public javax.jdo.Query newNamedQuery(javax.jdo.PersistenceManager pm,
                                     Class entityClass,
                                     String queryName)
                              throws javax.jdo.JDOException
This implementation delegates to JDO 2.0's newNamedQuery method.

To be overridden for pre-JDO2 implementations, using the corresponding vendor-specific mechanism there.

Specified by:
newNamedQuery in interface JdoDialect
Parameters:
pm - the current JDO PersistenceManager
entityClass - a persistent class
queryName - the name of the query
Returns:
the Query object
Throws:
javax.jdo.JDOException - in case of errors
See Also:
PersistenceManager.newNamedQuery(Class, String)

applyQueryTimeout

public void applyQueryTimeout(javax.jdo.Query query,
                              int remainingTimeInSeconds)
                       throws javax.jdo.JDOException
This implementation logs a warning that it cannot apply a query timeout.

Specified by:
applyQueryTimeout in interface JdoDialect
Parameters:
query - the JDO query object to apply the timeout to
remainingTimeInSeconds - the timeout value to apply
Throws:
javax.jdo.JDOException - if thrown by JDO methods
See Also:
JdoTemplate.prepareQuery(javax.jdo.Query)

translateException

public DataAccessException translateException(javax.jdo.JDOException ex)
This implementation delegates to PersistenceManagerFactoryUtils.

Specified by:
translateException in interface JdoDialect
Parameters:
ex - the JDOException thrown
Returns:
the corresponding DataAccessException (must not be null)
See Also:
PersistenceManagerFactoryUtils.convertJdoAccessException(javax.jdo.JDOException)

extractSqlStringFromException

protected String extractSqlStringFromException(javax.jdo.JDOException ex)
Template method for extracting a SQL String from the given exception.

Default implementation always returns null. Can be overridden in subclasses to extract SQL Strings for vendor-specific exception classes.

Parameters:
ex - the JDOException, containing a SQLException
Returns:
the SQL String, or null if none found


Copyright (c) 2002-2007 The Spring Framework Project.