在log4j.properties这个配置文件中加入以下配置语句即可：
log4j.logger.com.ibatis = DEBUG 
log4j.logger.com.ibatis.common.jdbc.SimpleDataSource = DEBUG 
log4j.logger.com.ibatis.common.jdbc.ScriptRunner = DEBUG 
log4j.logger.com.ibatis.sqlmap.engine.impl.SqlMapClientDelegate = DEBUG 
log4j.logger.java.sql.Connection = DEBUG 
log4j.logger.java.sql.Statement = DEBUG 
log4j.logger.java.sql.PreparedStatement = DEBUG, fileout 
log4j.logger.java.sql.ResultSet = DEBUG