Dariusz on Software

I bet everyone knows how to enable SQL logging for Hibernate. If you add this parametr to Hibernate configuration:

<property name="hibernate.show_sql">true</property>

you will see queries like this in log file:

select roles0_.EntityKey as Entity9_1_, roles0_.ENTITYKEY as ENTITY9_168_0_
from USERROLE roles0_
where roles0_.EntityKey=?

but wait: what value is passed as parameter by Hibernate? (parameters are marked as "?" in JDBC) You have configure TRACE level for some log categories, here's example for simplelog.properties:

org.apache.commons.logging.simplelog.log.org.hibernate.SQL=trace
org.apache.commons.logging.simplelog.log.org.hibernate.engine.query=trace
org.apache.commons.logging.simplelog.log.org.hibernate.type=trace
org.apache.commons.logging.simplelog.log.org.hibernate.jdbc=trace

For your convenience here's log4j configuration:

log4j.logger.org.hibernate.SQL=trace
log4j.logger.org.hibernate.engine.query=trace
log4j.logger.org.hibernate.type=trace
log4j.logger.org.hibernate.jdbc=trace

Then you will see all passed parameters and results in logs:

[DEBUG] (generated SQL here with parameter placeholders)
[TRACE] preparing statement
[TRACE] binding '1002' to parameter: 1
[TRACE] binding '1002' to parameter: 2
[TRACE] binding '1002' to parameter: 3
[DEBUG] about to open ResultSet (open ResultSets: 0, globally: 0)
[DEBUG] about to close ResultSet (open ResultSets: 1, globally: 1)
[DEBUG] about to close PreparedStatement (open PreparedStatements: 1, globally: 1)
[TRACE] closing statement

Nothing hidden here. Happy debugging!