Hibernate

Enable/Disable SQL log in Hibernate

Using a logging config file 

In the logging configuration file of your choice set the logging of the following packages to the levels shown.:


# log the sql statement
org.hibernate.SQL=DEBUG
# log the parameters
org.hibernate.type=TRACE

There will probably be some logger specific prefixes that are required.


Log4j config: 

log4j.logger.org.hibernate.SQL=DEBUG
log4j.logger.org.hibernate.type=TRACE

Spring Boot application.properties

logging.level.org.hibernate.SQL=DEBUG
logging.level.org.hibernate.type=TRACE

Logback logback.xml: 

<logger name="org.hibernate.SQL" level="DEBUG"/>
<logger name="org.hibernate.type" level="TRACE"/>


Using Hibernate properties

This will show you the generated SQL, but will not show you the values contained within the queries. 


<bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean"> <property name="hibernateProperties">
<props>
<!-- show the sql without the parameters --> <prop key="hibernate.show_sql">true</prop> <!-- format the sql nice -->
<prop key="hibernate.format_sql">true</prop> <!-- show the hql as comment -->
<prop key="use_sql_comments">true</prop>
</props>
</property>
</bean>


Enable/Disable SQL log in debug 

Some applications that use Hibernate generate a huge amount of SQL when the application is started. Sometimes it's better to enable/disable the SQL log in specific points when debugging. 


To enable, just run this code in your IDE when you are debugging the aplication:org.

apache.log4j.Logger.getLogger("org.hibernate.SQL").setLevel(org.apache.log4j.Level.DEBUG)


To disable:

org.apache.log4j.Logger.getLogger("org.hibernate.SQL").setLevel(org.apache.log4j.Level.OFF)