Topics
● Transaction types
● Isolation levels
● Propagation
● Transaction support in Spring
● Declarative transaction
Transaction Types
● Local transaction
– Specific to a single transactional resource (example: JDBC)
● Global transaction
– Managed by container
– Can span multiple transactional resources
Transaction Isolation Levels
● You can specify per method
Transaction Isolation Levels
● ISOLATION_DEFAULT
● ISOLATION_READ_UNCOMMITTED
– Dirty reads, non-repeatable reads and phantom reads can occur.
● ISOLATION_READ_COMMITTED
– Dirty reads are prevented; non-repeatable reads and phantom reads can occur.
● ISOLATION_REPEATABLE_READ
– Dirty reads and non-repeatable reads are prevented; phantom reads can occur.
● ISOLATION_SERIALIZABLE
– Dirty reads, non-repeatable reads and phantom reads are prevented
Transaction Propagation
● PROPAGATION_REQUIRED
– Support a current transaction, create a new one if none exists.
● PROPAGATION_SUPPORTS
– Support a current transaction, execute non-transactionally if none exists.
● PROPAGATION_MANDATORY
– Support a current transaction, throw an exception if none exists.
● PROPAGATION_REQUIRES_NEW
– Create a new transaction, suspend the current transaction if one
exists.
● PROPAGATION_NOT_SUPPORTED
● PROPAGATION_NEVER
● PROPAGATION_NESTED
Transaction Support in Spring
● Declarative transaction
● Programmatic transaction
Declarative Transaction
● You can declaratively specify that a method on a bean has transactional properties
– Spring handles the transactional behavior
● Built upon AOP
– For intercepting calls to methods for performing transaction
● No need to modify the code
– The code does not contain any transaction management code
– Changing transactional properties is just changing the configuration file
● A group of methods can be specified with a same transactional properties
– wildcard
● Additional interceptors can be plugged in
Configuration of Declarative Transaction
<bean id="clinicTarget" class="org.springframework.samples.petclinic.hibernate.HibernateClinic">
<property name="sessionFactory" ref="sessionFactory"/>
</bean>
<bean id="clinic"
class="org.springframework.transaction.interceptor.TransactionProxyFact
oryBean">
<property name="transactionManager" ref="transactionManager"/>
<property name="target" ref="clinicTarget"/>
<property name="transactionAttributes">
<props>
<prop key="get*">PROPAGATION_REQUIRED,readOnly</prop>
<prop key="find*">PROPAGATION_REQUIRED,readOnly</prop>
<prop key="load*">PROPAGATION_REQUIRED,readOnly</prop>
<prop key="store*">PROPAGATION_REQUIRED</prop>
</props>
</property>
</bean>
<!-- Transaction manager for a single Hibernate SessionFactory
(alternative to JTA) -->
<bean id="transactionManager"
class="org.springframework.orm.hibernate3.HibernateTransactionManager">
<property name="sessionFactory" ref="sessionFactory"/>
</bean>
<!-- Transaction manager that delegates to JTA (for a transactional JNDI
DataSource) -->
<!--
<bean id="transactionManager"
class="org.springframework.transaction.jta.JtaTransactionManager"/>
-->
Business Logic Class
public class HibernateClinic extends HibernateDaoSupport implements Clinic {
public Collection getVets() throws DataAccessException {
return getHibernateTemplate().find("from Vet vet order by vet.lastName,
vet.firstName");
}
public Collection getPetTypes() throws DataAccessException {
return getHibernateTemplate().find("from PetType type order by type.name");
}
public Collection findOwners(String lastName) throws DataAccessException {
return getHibernateTemplate().find("from Owner owner where owner.lastName
like ?", lastName + "%");
}
Thank You!
● Transaction types
● Isolation levels
● Propagation
● Transaction support in Spring
● Declarative transaction
Transaction Types
● Local transaction
– Specific to a single transactional resource (example: JDBC)
● Global transaction
– Managed by container
– Can span multiple transactional resources
Transaction Isolation Levels
● You can specify per method
Transaction Isolation Levels
● ISOLATION_DEFAULT
● ISOLATION_READ_UNCOMMITTED
– Dirty reads, non-repeatable reads and phantom reads can occur.
● ISOLATION_READ_COMMITTED
– Dirty reads are prevented; non-repeatable reads and phantom reads can occur.
● ISOLATION_REPEATABLE_READ
– Dirty reads and non-repeatable reads are prevented; phantom reads can occur.
● ISOLATION_SERIALIZABLE
– Dirty reads, non-repeatable reads and phantom reads are prevented
Transaction Propagation
● PROPAGATION_REQUIRED
– Support a current transaction, create a new one if none exists.
● PROPAGATION_SUPPORTS
– Support a current transaction, execute non-transactionally if none exists.
● PROPAGATION_MANDATORY
– Support a current transaction, throw an exception if none exists.
● PROPAGATION_REQUIRES_NEW
– Create a new transaction, suspend the current transaction if one
exists.
● PROPAGATION_NOT_SUPPORTED
● PROPAGATION_NEVER
● PROPAGATION_NESTED
Transaction Support in Spring
● Declarative transaction
● Programmatic transaction
Declarative Transaction
● You can declaratively specify that a method on a bean has transactional properties
– Spring handles the transactional behavior
● Built upon AOP
– For intercepting calls to methods for performing transaction
● No need to modify the code
– The code does not contain any transaction management code
– Changing transactional properties is just changing the configuration file
● A group of methods can be specified with a same transactional properties
– wildcard
● Additional interceptors can be plugged in
Configuration of Declarative Transaction
<bean id="clinicTarget" class="org.springframework.samples.petclinic.hibernate.HibernateClinic">
<property name="sessionFactory" ref="sessionFactory"/>
</bean>
<bean id="clinic"
class="org.springframework.transaction.interceptor.TransactionProxyFact
oryBean">
<property name="transactionManager" ref="transactionManager"/>
<property name="target" ref="clinicTarget"/>
<property name="transactionAttributes">
<props>
<prop key="get*">PROPAGATION_REQUIRED,readOnly</prop>
<prop key="find*">PROPAGATION_REQUIRED,readOnly</prop>
<prop key="load*">PROPAGATION_REQUIRED,readOnly</prop>
<prop key="store*">PROPAGATION_REQUIRED</prop>
</props>
</property>
</bean>
<!-- Transaction manager for a single Hibernate SessionFactory
(alternative to JTA) -->
<bean id="transactionManager"
class="org.springframework.orm.hibernate3.HibernateTransactionManager">
<property name="sessionFactory" ref="sessionFactory"/>
</bean>
<!-- Transaction manager that delegates to JTA (for a transactional JNDI
DataSource) -->
<!--
<bean id="transactionManager"
class="org.springframework.transaction.jta.JtaTransactionManager"/>
-->
Business Logic Class
public class HibernateClinic extends HibernateDaoSupport implements Clinic {
public Collection getVets() throws DataAccessException {
return getHibernateTemplate().find("from Vet vet order by vet.lastName,
vet.firstName");
}
public Collection getPetTypes() throws DataAccessException {
return getHibernateTemplate().find("from PetType type order by type.name");
}
public Collection findOwners(String lastName) throws DataAccessException {
return getHibernateTemplate().find("from Owner owner where owner.lastName
like ?", lastName + "%");
}
Thank You!
