Problem

Hibernate has basic logging feature to display the SQL generated statement with show_sql configuration property.

Hibernate: INSERT INTO mkyong.stock_transaction (CHANGE, CLOSE, DATE, OPEN, STOCK_ID, VOLUME) 
VALUES (?, ?, ?, ?, ?, ?)

However , it just isn’t enough for debugging, the Hibernate SQL parameter values are missing.

Solution – Log4j

Log4J is required to display the real Hibernate SQL parameter value.

1. Configure the Log4j in Hibernate

Follow this article to configure the Log4j in Hibernate

2. Change the Log level

Modify the Log4j properties file, and change the log level to “debug” or “trace” in “log4j.logger.org.hibernate.type” property.

log4j.properties
# Direct log messages to stdout
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.out
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n
 
# Root logger option
log4j.rootLogger=INFO, stdout
 
# Hibernate logging options (INFO only shows startup messages)
log4j.logger.org.hibernate=INFO
 
# Log JDBC bind parameter runtime arguments
log4j.logger.org.hibernate.type=trace

3. Done

The Hibernate real parameter values are display now

output
Hibernate: INSERT INTO mkyong.stock_transaction (CHANGE, CLOSE, DATE, OPEN, STOCK_ID, VOLUME) 
VALUES (?, ?, ?, ?, ?, ?)
13:33:07,253 DEBUG FloatType:133 - binding '10.0' to parameter: 1
13:33:07,253 DEBUG FloatType:133 - binding '1.1' to parameter: 2
13:33:07,253 DEBUG DateType:133 - binding '30 December 2009' to parameter: 3
13:33:07,269 DEBUG FloatType:133 - binding '1.2' to parameter: 4
13:33:07,269 DEBUG IntegerType:133 - binding '11' to parameter: 5
13:33:07,269 DEBUG LongType:133 - binding '1000000' to parameter: 6

If this logging is still not detail enough for you to debug the SQL problem, you can use the P6Spy library to log the exact SQL statement that send to database. Check this article – How to display hibernate sql parameter values with P6Spy

This article was posted in Hibernate category.