【LogBack日志】打印mybatis中sql日志并存放到指定文件中
前言：
在springboot中使用logbac-spring.xml单独打印mybaits中的sql，另存一个单独的日志中。
1、yml配置
# 日志配置
logging:
level:
com.xxxx.mapper: debug
org.springframework: warn
config: classpath:logback-app.xml
file:
path: ./logs/app
2、logback-spring.xml
<configuration>
<property resource="application.yml"/>
<springProperty scope="context" name="FILE_PATH" source="logging.file.path"/>
<property name="FILE_PATTERN" value="%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{50}: %msg%n"/>
<property name="MAX_HISTORY" value="10"/>
<property name="FILE_SIZE" value="10MB"/>
<appender name="INFO_FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
<file>${FILE_PATH}/sys-info.logfile>
<append>trueappend>
<rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
<fileNamePattern>${FILE_PATH}/sys-info.%d{yyyy-MM-dd}.logfileNamePattern>
<MaxHistory>${MAX_HISTORY}MaxHistory>
rollingPolicy>
<encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">
<pattern>${FILE_PATTERN}pattern>
encoder>
<triggeringPolicy class="ch.qos.logback.core.rolling.SizeBasedTriggeringPolicy">
<MaxFileSize>${FILE_SIZE}MaxFileSize>
triggeringPolicy>
<filter class="ch.qos.logback.classic.filter.LevelFilter">
<level>INFOlevel>
<onMatch>ACCEPTonMatch>
<onMismatch>DENYonMismatch>
filter>
appender>
<appender name="ERROR_FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
<file>${FILE_PATH}/sys-error.logfile>
<append>trueappend>
<rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
<fileNamePattern>${FILE_PATH}/sys-error.%d{yyyy-MM-dd}.logfileNamePattern>
<MaxHistory>${MAX_HISTORY}MaxHistory>
rollingPolicy>
<encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">
<pattern>${FILE_PATTERN}pattern>
encoder>
<triggeringPolicy class="ch.qos.logback.core.rolling.SizeBasedTriggeringPolicy">
<MaxFileSize>${FILE_SIZE}MaxFileSize>
triggeringPolicy>
<filter class="ch.qos.logback.classic.filter.LevelFilter">
<level>ERRORlevel>
<onMatch>ACCEPTonMatch>
<onMismatch>DENYonMismatch>
filter>
appender>
<appender name="DEBUG_FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
<file>${FILE_PATH}/sys-debug.logfile>
<append>trueappend>
<rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
<fileNamePattern>${FILE_PATH}/sys-debug.%d{yyyy-MM-dd}.logfileNamePattern>
<MaxHistory>${MAX_HISTORY}MaxHistory>
rollingPolicy>
<encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">
<pattern>${FILE_PATTERN}pattern>
encoder>
<triggeringPolicy class="ch.qos.logback.core.rolling.SizeBasedTriggeringPolicy">
<MaxFileSize>${FILE_SIZE}MaxFileSize>
triggeringPolicy>
<filter class="ch.qos.logback.classic.filter.LevelFilter">
<level>DEBUGlevel>
<onMatch>ACCEPTonMatch>
<onMismatch>DENYonMismatch>>
filter>
appender>
<appender name="SQL_FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
<file>${FILE_PATH}/sys-sql.logfile>
<append>trueappend>
<rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
<fileNamePattern>${FILE_PATH}/sys-sql.%d{yyyy-MM-dd}.logfileNamePattern>
<MaxHistory>${MAX_HISTORY}MaxHistory>
rollingPolicy>
<encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">
<pattern>${FILE_PATTERN}pattern>
encoder>
<triggeringPolicy class="ch.qos.logback.core.rolling.SizeBasedTriggeringPolicy">
<MaxFileSize>${FILE_SIZE}MaxFileSize>
triggeringPolicy>
<filter class="ch.qos.logback.classic.filter.LevelFilter">
<level>DEBUGlevel>
<onMatch>ACCEPTonMatch>
<onMismatch>DENYonMismatch>>
filter>
appender>
<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
<encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">
<pattern>${FILE_PATTERN}pattern>
encoder>
appender>
<logger name="org.springframework" level="WARN"/>
<logger name="com.xxx.mapper" level="DEBUG" additivity="false">
<appender-ref ref="SQL_FILE" />
<appender-ref ref="STDOUT" />
logger>
<root level="INFO">
<appender-ref ref="INFO_FILE" />
<appender-ref ref="ERROR_FILE" />
<appender-ref ref="DEBUG_FILE" />
<appender-ref ref="STDOUT" />
root>
configuration>
3、关键几点
几个关键点
a. 文件名需要为logback-spring.xml; 动态日志路径才会生效; 属性文件中配置 log.path=xxx;
【Log日志】logback.xml动态配置属性值(包括接入的第三方配置)
b. levle 需要是DEBUG等级; 因为sql日志是DEBUG等级的；name= 存放mapper文件的包路径
<logger name="com.xxx.mapper" level="DEBUG" additivity="false">
<appender-ref ref="SQL_FILE" />
<appender-ref ref="STDOUT" />
logger>
c. mybatis的log-impl需要配置正确的实现类 比如 在maybatis-plus中
# MyBatis配置
mybatis:
# 搜索指定包别名
typeAliasesPackage: com.xxx.**.domain
# 配置mapper的扫描，找到所有的mapper.xml映射文件
mapperLocations: classpath*:mapper/**/*Mapper.xml
configuration:
# 指定 MyBatis 所用日志的具体实现
log-impl: org.apache.ibatis.logging.slf4j.Slf4jImpl
# 开启自动下划线格式转驼峰格式
map-underscore-to-camel-case: true
# 全局映射器启用缓存
cache-enabled: true
# 允许 JDBC 支持自动生成主键
use-generated-keys: true
# 执行模式。默认是 SIMPLE
default-executor-type: reuse
# 允许查询结果为null
call-setters-on-nulls: true
d. 我之前就是一直配置的是 log-impl: org.apache.ibatis.logging.stdout.StdOutImpl ;导致文件只能出现在控制台；却没有打印到文件中;
参数值的默认值设置
如果配置文件没有设置属性. 可以在使用的地方设置默认值 例如${log.path:-默认值}
参考资料：
https://blog.51cto.com/szzdzhp/5300674
https://blog.csdn.net/happyxin_/article/details/128844723?spm=1001.2101.3001.6650.2&utm_medium=distribute.pc_relevant.none-task-blog-2%7Edefault%7EYuanLiJiHua%7EPosition-2-128844723-blog-116700232.235%5Ev28%5Epc_relevant_default&depth_1-utm_source=distribute.pc_relevant.none-task-blog-2%7Edefault%7EYuanLiJiHua%7EPosition-2-128844723-blog-116700232.235%5Ev28%5Epc_relevant_default&utm_relevant_index=3
https://blog.csdn.net/DreamMryang/article/details/115351202