java.lang.Object
- org.springframework.orm.jpa.DefaultJpaDialect
- - org.springframework.orm.jpa.vendor.EclipseLinkJpaDialect

All Implemented Interfaces:
Serializable, PersistenceExceptionTranslator, JpaDialect
```
public class EclipseLinkJpaDialect
extends DefaultJpaDialect
```
JpaDialect implementation for Eclipse Persistence Services (EclipseLink). Developed and tested against EclipseLink 2.4.
By default, this class acquires an early EclipseLink transaction with an early JDBC Connection for non-read-only transactions. This allows for mixing JDBC and JPA/EclipseLink operations in the same transaction, with cross visibility of their impact. If this is not needed, set the "lazyDatabaseTransaction" flag to true or consistently declare all affected transactions as read-only. As of Spring 4.1.2, this will reliably avoid early JDBC Connection retrieval and therefore keep EclipseLink in shared cache mode.
Since:
2.5.2
Author:
Juergen Hoeller
See Also:
setLazyDatabaseTransaction(boolean), LazyConnectionDataSourceProxy, Serialized Form

Constructor Summary
Constructors
Constructor Description
EclipseLinkJpaDialect()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`Object`	`beginTransaction(EntityManager entityManager, TransactionDefinition definition)`	This implementation invokes the standard JPA `Transaction.begin` method.
`ConnectionHandle`	`getJdbcConnection(EntityManager entityManager, boolean readOnly)`	This implementation always returns `null`, indicating that no JDBC Connection can be provided.
`void`	`setLazyDatabaseTransaction(boolean lazyDatabaseTransaction)`	Set whether to lazily start a database resource transaction within a Spring-managed EclipseLink transaction.

Methods inherited from class org.springframework.orm.jpa.DefaultJpaDialect
cleanupTransaction, prepareTransaction, releaseJdbcConnection, translateExceptionIfPossible

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - EclipseLinkJpaDialect
```
public EclipseLinkJpaDialect()
```
- Method Detail
  - setLazyDatabaseTransaction
```
public void setLazyDatabaseTransaction(boolean lazyDatabaseTransaction)
```
    Set whether to lazily start a database resource transaction within a Spring-managed EclipseLink transaction.
    By default, read-only transactions are started lazily but regular non-read-only transactions are started early. This allows for reusing the same JDBC Connection throughout an entire EclipseLink transaction, for enforced isolation and consistent visibility with JDBC access code working on the same DataSource.
    Switch this flag to "true" to enforce a lazy database transaction begin even for non-read-only transactions, allowing access to EclipseLink's shared cache and following EclipseLink's connection mode configuration, assuming that isolation and visibility at the JDBC level are less important.
    See Also:
    UnitOfWork.beginEarlyTransaction()
  - beginTransaction
```
public Object beginTransaction(EntityManager entityManager,
                               TransactionDefinition definition)
                        throws PersistenceException,
                               SQLException,
                               TransactionException
```
    Description copied from class: DefaultJpaDialect
    This implementation invokes the standard JPA Transaction.begin method. Throws an InvalidIsolationLevelException if a non-default isolation level is set.
    This implementation does not return any transaction data Object, since there is no state to be kept for a standard JPA transaction. Hence, subclasses do not have to care about the return value (null) of this implementation and are free to return their own transaction data Object.
    Specified by:
    beginTransaction in interface JpaDialect
    Overrides:
    beginTransaction in class DefaultJpaDialect
    Parameters:
    entityManager - the EntityManager to begin a JPA transaction on
    definition - the Spring transaction definition that defines semantics
    Returns:
    an arbitrary object that holds transaction data, if any (to be passed into JpaDialect.cleanupTransaction(java.lang.Object)). May implement the SavepointManager interface.
    Throws:
    PersistenceException - if thrown by JPA methods
    SQLException - if thrown by JDBC methods
    TransactionException - in case of invalid arguments
    See Also:
    EntityTransaction.begin(), InvalidIsolationLevelException, DefaultJpaDialect.cleanupTransaction(java.lang.Object)
  - getJdbcConnection
```
public ConnectionHandle getJdbcConnection(EntityManager entityManager,
                                          boolean readOnly)
                                   throws PersistenceException,
                                          SQLException
```
    Description copied from class: DefaultJpaDialect
    This implementation always returns null, indicating that no JDBC Connection can be provided.
    Specified by:
    getJdbcConnection in interface JpaDialect
    Overrides:
    getJdbcConnection in class DefaultJpaDialect
    Parameters:
    entityManager - the current JPA EntityManager
    readOnly - whether the Connection is only needed for read-only purposes
    Returns:
    a handle for the Connection, to be passed into releaseJdbcConnection, or null if no JDBC Connection can be retrieved
    Throws:
    PersistenceException - if thrown by JPA methods
    SQLException - if thrown by JDBC methods
    See Also:
    JpaDialect.releaseJdbcConnection(org.springframework.jdbc.datasource.ConnectionHandle, javax.persistence.EntityManager), ConnectionHandle.getConnection(), SimpleConnectionHandle, JpaTransactionManager.setDataSource(javax.sql.DataSource), NativeJdbcExtractor

Class EclipseLinkJpaDialect

Constructor Summary

Method Summary

Methods inherited from class org.springframework.orm.jpa.DefaultJpaDialect

Methods inherited from class java.lang.Object

Constructor Detail

EclipseLinkJpaDialect

Method Detail

setLazyDatabaseTransaction

beginTransaction

getJdbcConnection