mybatis use log4j

mybatis the log4j logging support

• In mybatis global configuration file by tag control mybatis global switches;
• Log4j in mybatis.xml in turn:

<settings>
	    <!-- mybatis开始log4j支持的功能 -->
        <setting name="logImpl" value="LOG4J"/>
</settings>

注意：在src下必须有log4j.properties，必须保证有log4j.jar。

• log4j log may output the specified contents (control contents of a local logging level)

<mapper namespace="a.b">
   <select id="c" resultType="xxx.xxx.xxx.People">
       select * from people
   </select>
</mapper>

先总体调成ERROR，不输出无用信息,再设置某个指定位置级别为DEBUG:
log4j.roo tCategory=ERROR, CONSOLE , LOGFILE
命名级别（包级别）:
log4j.logger.a=DEBUG
命名级别（类级别）:
log4j.logger.a.b=DEBUG
命名级别（方法级别）:
log4j.logger.a.b.c=DEBUG