在工作中，排查问题时难免需要输出MyBatis真正执行的SQL及参数，需查看SQL信息，如下是一种配置方法：

log4j2.xml

<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="info"><Appenders><Console name="console" target="SYSTEM_OUT"><PatternLayout pattern="%d{yyyy-MM-dd HH:mm:ss.SSS} [%t] %-5p %c{1}(%F:%L) - %m%n" /></Console><RollingFile name="fixedTimeFileAppender" fileName="app/projectName.log"filePattern="app/projectName.log.%d{yyyy-MM-dd}.%i.log"><PatternLayout pattern="%d{yyyy-MM-dd HH:mm:ss.SSS} [%t] %-5p %c{1}(%L) - %m%n" /><Policies><TimeBasedTriggeringPolicy /><SizeBasedTriggeringPolicy size="200 MB" /></Policies><DefaultRolloverStrategy max="24" /></RollingFile><RollingFile name="fixedTimeFileSQLAppender" fileName="app/projectName-sql.log"filePattern="app/projectName-sql.log.%d{yyyy-MM-dd}.%i.log"><PatternLayout pattern="%d{yyyy-MM-dd HH:mm:ss.SSS} [%t] %-5p %c{1}(%L) - %m%n" /><Policies><TimeBasedTriggeringPolicy /><SizeBasedTriggeringPolicy size="200 MB" /></Policies><DefaultRolloverStrategy max="24" /></RollingFile><Async name="async" bufferSize="512"><AppenderRef ref="fixedTimeFileAppender" /></Async><Async name="asyncsql" bufferSize="512" level="debug"><AppenderRef ref="fixedTimeFileSQLAppender" /></Async></Appenders><Loggers><Logger name="cn.bijian" level="info" additivity="false"><AppenderRef ref="async" /></Logger><Logger name="cn.bijian.projectName.dao" level="debug" additivity="false"><AppenderRef ref="asyncsql" /></Logger><Root level="info"><AppenderRef ref="async" /></Root></Loggers>
</Configuration>